Engenharia de Materiais (UACSA)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2913
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Item Adsorção de corantes em materiais híbridos obtidos de biomassa pirolisada com nanopartículas magnéticas(2021-03-05) Nascimento, Rizia Keila do; Araújo, Ana Cláudia Vaz de; http://lattes.cnpq.br/6861890992609511; http://lattes.cnpq.br/8972131109377770The adsorption of residues in aqueous medium is an effective process for treating effluents from the textile industry. Several materials have been developed for this purpose, and their adsorptive capacity has been thoroughly studied. In this work, a new adsorbent material was synthesized by a hydrothermal route. This hybrid material (named HB) is formed by biomass residue (sugarcane straw) and magnetite nanoparticles (NPs), an iron oxide. The magnetite cubic phase in HB was identified by X-ray diffraction. The Fe-O vibrational band, characteristic of iron oxide, was observed by infrared spectroscopy. HB presented a globular morphology, with a wide range of size (between 500 nm and 2 m). The performance of HB as an adsorbent was evaluated through the adsorption of the dyes Congo Red (VC) and Indigo Carmine (IC). The concentrations studied varied between 6.97 and 69.67 mg.L-1 for VC and between 4.66 and 46.64 mg.L-1 for IC. The adsorption kinetics curves showed that the saturation time of HB for both dyes was around 120 h. Most of the adsorption (around 71 % for the VC and 28 % for the IC) occurred in the first 24 h of contact between the adsorbent and the dyes. This indicates the feasibility of using HB on an industrial scale, mainly in the treatment of water contaminated by VC residues. The adsorption kinetics for both systems followed the Pseudo Second Order model, with 99% correlation for VC, and 82% for IC. For the adsorption isotherms, the Langmuir, Freundlich and Temkin models satisfactorily described the HB/VC system (above 95 % correlation) and the Freundlich and Temkin models described HB/IC (above 92 % correlation). The results presented show that HB has potential for adsorption of dyes in aqueous medium.Item Adsorção do preto reativo 5 a partir das cinzas do bagaço da cana-de-açúcar(2024-08-02) Souza, Ellen Cristovão de; Freitas, Jucleiton José Rufino de; http://lattes.cnpq.br/5437959745507297; http://lattes.cnpq.br/5321037256511207Water is essential for humanity, but in the Brazilian Northeast there is a serious socio- environmental problem due to poor distribution and low water availability, aggravated by the expansion of agribusiness and contamination of water sources. Industrial pollution is a major problem, especially in the textile sector, which uses toxic dyes that are difficult to remove, such as Reactive Black 5 (RB5), widely used in the textile industry, is a toxic, mutagenic and carcinogenic dye. To mitigate the damage, nanotechnology, which manipulates materials on a nanometric scale, offers promising solutions. Adsorption is an efficient method for treating effluents, standing out for its ease and simplicity. Among adsorbents, such as zeolites, minerals with high adsorption capacity, are promising for removing contaminants. The study focuses on the synthesis of zeolites from sugarcane bagasse ash, supplied by the Olho D’Água plant (Camutanga-PE). The ash was prepared, dried and characterized, and the silica was extracted by thermal and chemical methods. The synthesized zeolites were tested for adsorption of the RB5 dye, demonstrating high efficiency in dye removal in adsorption tests with different masses and interaction times. The adsorption process proved to be effective and economical for the treatment of water contaminated by textile dyes, with positive results when using chemically treated ash. New tests indicated that, even with less ash, the decolorization efficiency was high. Adsorption, therefore, represents a viable and low-cost solution for the remediation of contaminated water.Item Análise da resistência a corrosão do aço API 5L X70 revestido com inconel 625 por soldagem plasma pó e por arco submerso(2021-12-09) Ferreira, Beatriz Cândida de Farias; Santos, Aureliano Xavier dos; http://lattes.cnpq.br/0810494477757052; http://lattes.cnpq.br/8533374114394812Annually, the oil industry invests large amounts in pipeline maintenance, mainly in anti- corrosion measures. Thus, solutions are sought that combine low cost, reproducibility and consistent properties. One of them is the use of materials that have high mechanical and anti- corrosive properties in the form of coatings that can be deposited by welding. This study aimed to evaluate the effects of different welding parameters on the corrosion resistance of inconel 625 alloy coatings deposited by API 5L X70 steel by the PTA welding process , evaluate samples with higher and lower dilution and use the parameters of these experiments to perform SAW submerged arc welding coating in order to compare the processes. The parameters were optimized through factorial experimental design and the results analyzed by the Response Surface Methodology (MSR). The samples were mainly evaluated by dilution (D), iron content (Fe) and resistance to corrosion by linear potentiodynamic polarization (PPL).Item Análise de parâmetros de qualidade de tintas em um impressora de rotogravura(2024-01-29) Oliveira, Breno Cézar Cabral de; Diniz, Verônica Cristhina de Souza; http://lattes.cnpq.br/9239037374332331; http://lattes.cnpq.br/0857097292608960This article aims to conduct a study on the relationship between the quality of inks used in a rotogravure printer and the enhancement of packaging quality produced by the printing process. Goals include conducting a detailed evaluation of ink characteristics, addressing color management plans, analyzing the cost/quality of inks, and describing project management strategies. The methodology for ink analysis and continuous monitoring of printing processes record data related to ink quality through colorimetric analyses (Lab, DeltaE, drying time, viscosity, density). Statistical tools are utilized to evaluate the significance of improvements observed in ink quality. In this analysis, 20 products were monitored, internally labeled as works 1 to 20, while strictly adhering to viscosity and drying time values. By monitoring inks using DeltaE, Lab, and density, a notable 40% reduction in machine color adjustment time was observed, leading to a 15% decrease in downtime across the 20 analyzed works. The ink quality analysis software used demonstrated an accuracy above 80% compared to the reference. Regarding ink costs, they were found to be aligned with the market. All analyses of raw materials revealed positive results, emphasizing the effectiveness of reusing standards for laboratory technicians, resulting in a significant improvement in the methods used.Item Análise do processo adsortivo de corantes industriais por nanopartículas magnéticas de magnetita (Fe3O4)(2019-07-08) Cabral, Ariane Nathália de Siqueira Souza; Araújo, Ana Cláudia Vaz de; http://lattes.cnpq.br/6861890992609511; http://lattes.cnpq.br/3246406733304902Environmental degradation is an inevitable factor that accompanies the development of the population and unfortunately this has reached water systems, rivers and water sources. Among the agents that contribute to the contamination and degradation are the dyes from the textile and food industries that are discarded throughout the production processes. There are several methods being developed to eliminate the effluent dyes in rivers and springs, among which is the adsorption process. The magnetic nanoparticles of magnetite (Fe3O4) have been previously tested in the adsorption of dye residues from the textile and food industries. In this context, the objective of this work was to study the efficiency of magnetic nanoparticles of magnetite (NPs) in the adsorption process of some dyes present in industrial textile effluents, such as dyes, methyl orange (MEL) and methylene blue (AM) . A factorial design 2³ was established obtaining as factors studied time, pH and temperature, and for these factors its levels were analyzed. Analyzes were made for systems under ultrasound and under magnetic stirring, and for this, significant results were obtained for the two dyes. According to the results obtained for the ALM / NPs, factors such as time and pH with greater significance. It was observed that the most successful tests for adsorption were the tests 02 (11,362) and 06 (10,057), for the systems under ultrasound and under magnetic stirring, respectively. For the AM / NPs it was significant only the factor, time. The most favorable tests for the dye adsorption system were 04 (19,144) and 06 (21,457), for systems under ultrasound and under magnetic stirring, respectively.Item Análise do processo produtivo de filmes flexíveis sob a perspectiva das práticas de gestão ambiental e produção mais limpa(2024-02-26) Montenegro, Jennifer Araújo; Freitas, Jucleiton José Rufino de; http://lattes.cnpq.br/5437959745507297; http://lattes.cnpq.br/5500156432935264This article addresses the implementation of the Cleaner Production Program (CPP) in a flexible plastic packaging manufacturing company located in Pernambuco. The study, conducted between November 2021 and March 2023, aimed to identify improvement opportunities capable of reducing environmental impacts. The application of the CPP methodology enabled the identification and adjustment of processes, with a focus on reduction, reuse, and consequently, cost reduction. Although the results achieved met the program's expectations, some opportunities for structural improvements were not implemented due to associated high costs. The program incorporated certain principles aligned with the company's values, leading employees to adopt a different perspective regarding their activities and to act in accordance with good operational practices and waste separation.Item Análise do tempo mínimo de cura de adesivo de poliuretano utilizado na laminação de filme de poliéster e polietileno(2021-11-29) Brito, Venicius Leony de França; Fonsêca, Juliana de Castro Macêdo; http://lattes.cnpq.br/8869180950884002; http://lattes.cnpq.br/6624281780568416A mixture of solvent-based polyurethane adhesive and ethyl acetate was prepared and applied to 12 μm polyester films with a coating machine, followed by an overlay with a 36 μm lowdensity polyethylene film of thickness. The obtained sample were conditioned in an oven at different temperatures in a humid environment, at intervals of 2, 4, 6, 8, and 24 hours. After this period, the variation of the adhesive cure as a function of temperature and time was endorsed through the analysis of Infrared spectroscopy with Fourier Transform using the Attenuated Total Reflectance technique (FIIR-ATR) with germanium crystal. Through analysis of 2270 cm-1 FTIR band. The aim of this work is to determine the shortest cure time for adhesives used in PET and PE lamination, using Fourier Transform infrared spectroscopy and Attenuated Total Reflectance technique.Item Aplicação das ferramentas da qualidade para a redução das perdas de qualidade numa linha de fabricação de massas(2021-07-15) Cabral, Ariane Nathália de Siqueira Souza; Araújo, Ana Cláudia Vaz de; http://lattes.cnpq.br/6861890992609511; http://lattes.cnpq.br/3246406733304902The competition between companies that work with production in general, forces them to implement improvements in their management and control systems, aiming to reduce losses in production processes. This work was developed in a pasta factory located in the city of Jaboatão dos Guararapes in Pernambuco. The objective of this work was to diagnose and reduce losses in a pasta production line. A survey of losses was made in a production line of Ninho noodles, for a period of six months. The cost of existing losses was estimated, and the responsible sector stipulated a 40% reduction in this cost in the line under study. A study of the operation of this line was carried out. It was found that the main sites for reprocessing were in the press, in the drying tunnel, in the wire mat and in the elevator belt. Thus, from the 5 whys tool, the root causes of the problem were obtained: wire and elevator belt. From the application of the PDCA cycle, the actions were successfully carried out with a reduction of 61% of the non-conformity of the Reprocessing in the Nest-type noodle line. This loss reduction in the four months of the project due to Reprocessing, generated an annual gain of 25.1 ton/year, which means an annual gain of R$ 115,290.00 for the company.Item Aplicação de nanomateriais advindos de biomassa para tratamento de águas residuárias da indústria têxtil(2019-01-25) Nascimento, Rizia Keila do; Araújo, Ana Cláudia Vaz de; http://lattes.cnpq.br/6861890992609511; http://lattes.cnpq.br/8972131109377770The inadequate disposal of industrial effluents has caused serious problems of environmental contamination worldwide. In the textile pole of Pernambuco some cases of river pollution were reported due to the process of dyeing and washing of fabrics. In this work, the feasibility of the use of nanostructured carbonaceous materials (CN) in the adsorption of textile dyes is studied. To obtain the carbonaceous material sugarcane leaves were used, these were washed, dried, crushed and submitted to hydrothermal synthesis. The samples were characterized by X-ray diffractometry (XRD), infrared (IR) spectroscopy, thermogravimetric analysis (TGA) and porosimetric analysis. The synthesized materials were presented as finely divided dark powders. In adsorption analyzes of the indigo carmine and red congo dyes the nanomaterials showed to be promising adsorbents. It was possible to observe a favorable behavior in relation to the adsorption of the dyes in liquid medium. The Langmuir, Freundlich and Redlich- Peterson isotherm models were suitable for the studied materials. The kinetic adsorption analysis suggests a pseudo second order behavior. The adsorptive mechanism of the nanomaterials could be characterized as heterogeneous, with adsorbate / adsorbent interactions of a chemical nature, where adsorption in monolayers is carried out at low concentrations and in multilayers at high concentrations of dye.Item Aplicações de simulações computacionais para melhorias e redução de custos no processo de injeção de termoplásticos(2021-07-14) Ribeiro, Rayanne do Nascimento Guerra Melo; Figueiredo, José Fernando DagnoneThe present project is intended to study the importance using computer simulations with the Inventor Moldflow 2019 software to study the main defects and the possibility of cost reduction in the thermoplastic injection process as a benefit of using industry 4.0 concepts. For this, thermoplastics High Density Polyethylene (HDPE or HDPE) and Polypropylene (PP) were studied to simulate the injection process of the plastic component of the domestic orange juice cone. The results induced that the injection parameters are influenced by the morphological properties of the polymers, with the crystallinity being directly induced in the contraction and injection pressure of thermoplastics. So, it was possible to show the potential of computer simulations as a tool for cost reduction in the thermoplastic injection process.Item Aumento da produtividade através da aplicação da metodologia World Class Manufacturing (WCM) com foco no pilar Workplace Organization (WO) em uma linha de montagem do setor automotivo de Pernambuco(2020-11-04) Costa, Laís Martins Correia da; Figueiredo, José Fernando Dagnone; http://lattes.cnpq.br/0648307320706020; http://lattes.cnpq.br/5181183753810801The Word Class Manufacturing (WCM) emerges as an efficient and effective management model, based on the concepts of zero waste, zero breaks, zero defects and zero stock, ensuring the safety of all employees, quality in all parts and high performance production. The main objective of this work was to show how to increase the productivity of a production line of the Industry of the automotive sector of Pernambuco with a focus on the application of the reactive and preventive concepts and tools of the pillar, Workplace Organization (Organization of the Workplace - WO), through the implementation of Kaizens referring to steps (steps) 1,2,3,4 and 5. The results obtained reveal that the objective was achieved and that the expansion of activities to similar production lines is possible, proving the efficiency of the methodItem Avaliação das propriedades de rejeitos contido no efluente industrial de uma empresa cerâmica como alternativa para reaproveitamento na fabricação de louças sanitárias(2022-05-23) Silva, Robson de França; Nascimento, Renalle Cristina Alves de Medeiros; http://lattes.cnpq.br/6167163214175615; http://lattes.cnpq.br/5901815548984027Effluents are all wastes originating from production processes or human consumption. They present specific physical, chemical and biological characteristics and their properties vary according to the raw material, the management and the branch of activity. When effluents are contaminated by solid materials from the industrial sector, treatments are usually carried out to separate the liquid part from the solid, thus obtaining a cleaner industrial waste. In a sanitary ware factory, ceramic clay slip is the propellant material for making the pieces. Sometimes this slip arrives at the effluent treatment plant and is then properly disposed of into the environment. Based on the above, this work aims to determine the physical, chemical and mineralogical characteristics of the mass retained in the filtration operations of the production process of sanitary ware. For this, a sample of retained mass, called sludge, from the industrial process of a factory of sanitary ware, was characterized from the tests of particle size distribution, Foster swelling, Cation Exchange Capacity and Specific Area, X-ray fluorescence spectroscopy, deflocculation curve, loss on fire and the test bodies, characterized by colour, shrinkage burning and flexural modulus of rupture. The results showed that the sludge had a wide particle size distribution, in the range of 0.3μm to 53μm, Haloisite4H2O as argillomineral of the clay fraction, high purity and good mechanical strength, being possible to infer that the reuse of sludge in ceramic mass is an alternative to reduce costs, resulting in a more sustainable production.Item Avaliação do desperdício no processo produtivo de embalagens Doy Pack: possíveis causas e soluções(2022-09-29) Pereira, Juliane Paula de Lima; Andrade, Daniela de Lourdes Anjos Coutinho Simões; Andrade, André Luís Simões; http://lattes.cnpq.br/9922792912017424; http://lattes.cnpq.br/8149955436222196; http://lattes.cnpq.br/2192126956757523Flexible plastic packaging has revolutionized the packaging sector due to its versatility, greater protection, barrier properties, and transparency, which have enabled its application in the most different industry segments. The manufacturing of these packages is relatively complex, depending on the type, and involves variables ranging from the transformation process of the raw material to the product ready for commercialization, and waste and losses are frequent in the process. Therefore, before reaching the final consumer, these packages go through several tests aiming to ensure the quality, protection of the filled product and avoid losses. Among these tests is the Coefficient of Friction (COF), which measures the friction force when sliding a material over a specific surface, and the determination of film thickness and grammage, that can be decisive in application and the choice of material. In this context, the present work aimed to identify and evaluate the possible causes of waste in the production process of Doy Pack packaging in a company in the metropolitan region of Recife and based on this data, develop an action plan to reduce these losses. To this purpose, one of the most important sectors of the company, the filling sector, was monitored, analyzing 30 samples (spools) during a 40 days period in the afternoon shift. During this period, the COF was determined, before and after filling, grammage and thickness in random samples of the films also collected in the sector under analysis were determined. Finally, an action plan was developed to help reduce losses. According to the numerical results collected on the production line, it was possible to observe that the pre-filling friction coefficient was generally in the range required in the company's standard procedure, and that after going through the filling process, this coefficient increased, hindering the sliding of the films on the reels, and causing losses. Therefore, it was observed the need for constant control of the friction coefficient, since it, being in compliance, guarantees the proper sliding of the films for Doy Pack packaging, the lower the COF, the easier the films slide on the reels, facilitating production, reinforcing the importance of controlling this physical property in the plant. The thickness and grammage results were within the company's specifications, requiring no adjustments.Item Avaliação do uso de politereftalato de etileno (PET) pós consumo na indústria de embalagens alimentícias(2021-07-15) Silva, Bárbara Stefany Lima Da; Andrade, Daniela de Lourdes Anjos Coutinho Simões; http://lattes.cnpq.br/8149955436222196; http://lattes.cnpq.br/0185643398779242The environmental appeals and the high percentage of Poly (Ethylene Terephthalate) - PET waste, discarded in nature, often inappropriately, drive the packaging market to seekalternatives for the use of post-consumer recycled PET (PET-PCR). In order to assist in this purpose, this work evaluated the feasibility of using 100% recycled PET as a raw material in the production of food packaging. For this purpose, PET-PCR was injected ina two-stage Husky injection molding machine with a 48-cavity mold. The results were compared with those of virgin PET (PET-V), a raw material already used, in order to evaluate the influence of the resin type used on the quality and viability of the preform for application in the packaging sector. The green coloring additive was added in both formulations, with 0.04% and 0.07%, by mass for PET-V and PET-PCR, respectively, to guarantee the color required in some types of carbonated beverages. According to the results obtained, the parameters established for the PET-PCR forming process did not cause injection defects or great divergences in relation to PET-V. Through intrinsic viscosity analysis, visual inspection, colorimetry and differential scanning calorimetry (DSC), it was noticed that PET-PCR is more susceptible to degradative hydrolytic fissionreactions, as expected, since it is a resin which has a thermal history, but these reactions do not make its use unfeasible in food packaging. The gas chromatography results show that the injection process used for PET-V provided higher acetaldehyde contents, this result was attributed to the more aggressive conditions during the extrusion step and, finally, the specific migration test showed that the PET- PCR is within the limits applicable according to the Brazilian Legislation for Carbonated Drinks (ANVISA - Technical Information No. 71 of February 11, 2016). Thus, PET-PCR can be used in theproduction of food packaging since the deviations found are purely esthetic and do not interfere with its quality and applicability.Item Caracterização de matérias-primas cerâmicas utilizadas na produção de placas de revestimento em indústria do Cabo de Santo Agostinho(2019-12-10) Silva, Renata Arcelino da; Diniz, Verônica Cristhina de Souza; http://lattes.cnpq.br/9239037374332331; http://lattes.cnpq.br/4639841941851252Properties of ceramic products are related to initial characteristics of raw materials, so it is important to study them to obtain a quality product. In this study, aimed to evaluate clay composition and study physical-mechanical behavior of different raw materials used in production of ceramic tiles, allowing their analysis and processing in a simple, controlled and standard. Six unidentified raw materials donated by a ceramic coating industry from Cabo de Santo Agostinho were used. The samples were benefited and characterized per X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX) and sedimentary particle size. After, raw materials were uniaxial pressing and subjected to controlled burning at 1000 ºC/ 1h with rate of 5ºC / min. Then, properties were evaluated per of linear shrinkage, water absorption, apparent porosity and flexural strength. The samples presented crystalline phases of kaolinite, quartz, mica and smectite, besides of alkaline oxides. The mechanical properties of samples showed the highest plasticity index (18%) and maximum strength went MP1 and MP6, 18% and 20.45 MPa, respectively. Thus, the raw materials presented physical properties for use in various applications in ceramic tile, such as ceramic.Item Desenvolvimento de um aplicativo na Power Plataform para gestão de qualidade assegurada em uma indústria alimentícia: Matriz QA em ação(2023-09-15) Silva, Rafael Aldreem Alves da; Ghislandi, Marcos Gomes; http://lattes.cnpq.br/3409757365313853; http://lattes.cnpq.br/1915012203419619This study highlights the development and implementation of an application on the Power Platform, using SharePoint as a database, aimed at quality management in the food industry, emphasizing the QA Matrix. Considering the complexity and regulations of the food sector, ensuring quality is essential. The application developed centralizes information, optimizes the management of QA's history, reduces the dispersion of documents and strengthens the management and control of QA's. The QA Matrix is applied in a structured manner, facilitating the identification, prioritization, and mitigation of risks. The research highlights the effectiveness of the integration between Power Platform and SharePoint, bringing benefits such as the consolidation of databases and files, refined control over trends and errors in preparation, and an improved interface compared to previous methodologies. The transition from multiple files to a single application, combined with an intuitive interface and preventive adjustments, results in time savings and greater precision in the construction of the QA Matrix. The proactive approach adopted reinforces the commitment to excellence in quality in the food industry.Item Efeito dos parâmetros de soldagem em revestimentos a base de níquel nas medidas eletroquímicas de corrosão(2024-09-30) Santos, Paulo Vinícius Lima dos; Santos, Aureliano Xavier dos; http://lattes.cnpq.br/0810494477757052; https://lattes.cnpq.br/7584847021954297Metallic materials are widely used in industry, including API 5L X70 steel, used for oil transportation. However, these steels are susceptible to corrosion due to the aggressive environment. As a result, various studies have been carried out to mitigate the effect of corrosion. Solid wire welding processes are used to weld coatings for this purpose, but they require information from the user to determine the most suitable welding conditions. The aim of this work was to study the influence of welding parameters for Inconel 625-based coatings on electrochemical corrosion measurements. To optimize the experiments, a full factorial design was used to evaluate the welding parameters, welding speed and feed rate. After welding, the samples were cross-sectioned and dilution calculations and iron content measurements were made by EDX. Finally, to reveal the corrosion resistance, the electrochemical technique by linearpotentiodynamic polarization was used, through polarization resistance, corrosion potential, corrosion current.Item Efeitos da temperatura no comportamento mecânico de matérias-primas utilizadas na produção de cerâmica de revestimento em indústria do Cabo de Santo Agostinho – PE(2021-01-30) Silva, Renata Arcelino da; Diniz, Verônica Cristhina de Souza; http://lattes.cnpq.br/9239037374332331; http://lattes.cnpq.br/4639841941851252The properties of ceramic tiles are dependent on their chemical composition and on the microstructure developed, mainly during the heat treatment to which they are developed. In this study, aimed to evaluate the influence of temperature on the mechanical behavior of ceramic raw materials of different compositions used in production of ceramic tiles, allowing their analysis and processing in a simple, controlled and standard. Six raw materials donated by a ceramic coating industry from Cabo de Santo Agostinho - Pernambuco were used. Samples of raw material were compacted by uniaxial pressing, then subjected to controlled sintering at 1000, 1100 and 1200 ° C for 1h, with a heating rate of 5ºC / min. Then, properties were evaluated per of linear shrinkage, water absorption, apparent porosity and flexural strength. The samples MP5 showed a good mechanical performance in relation to temperature variation, showed maximum strength, 45.27 MPa at 1100ºC, associated with low porosity (2.34% at 1100ºC) and the minimum concentration of internal cracks resulting from the low retraction of the part (6.34% at 1100ºC). Therefore, the raw materials presented physical properties for use in various applications in ceramic tile.Item ESTUDO COMPARATIVO DAS PROPRIEDADES TÉRMICAS, MORFOLÓGICAS E MECÂNICAS DE PA E PLA NA IMPRESSÃO 3D(2024-11-30) Silva, Rafael Aldreem Alves da; Ghislandi, Marcos Gomes; http://lattes.cnpq.br/3409757365313853; http://lattes.cnpq.br/1915012203419619This study conducted a comprehensive characterization of the thermal, morphological, and mechanical properties of poly(lactic acid) (PLA) and polyamide (PA) filaments used in 3D printing, including their carbon fiber (CF) and glass fiber (GF) reinforced variants, as well as specialized versions for high-strength (PRO) and high-temperature (PAHT) applications. Using Differential Scanning Calorimetry (DSC), tensile tests, and Scanning Electron Microscopy (SEM), the thermal behavior, mechanical strength, and internal morphology of the filaments were investigated. The results indicate that PAHT CF15, reinforced with 15% carbon fiber, exhibits the best thermal and mechanical resistance, making it suitable for high-temperature applications. PA6 GF30, with 30% glass fiber, offers a good balance between stiffness and strength. In contrast, PLA White and PLA Pro materials are more suited for moderate- temperature applications. The analysis of different infill patterns (40% and 100%) reveals that the choice of configuration depends on cost-effectiveness, considering the specific application and desired strength. The study suggests that improvements in matrix-fiber adhesion could optimize the performance of the composites, particularly for PAHT CF15.Item Estudo da influência da temperatura na alteração do revestimento permanente do fundo de uma panela de aço em uma aciaria elétrica(2022-01-09) Diniz, Emilly Vithória Oliveira Rocha; Diniz, Verônica Cristhina de Souza; http://lattes.cnpq.br/9239037374332331; http://lattes.cnpq.br/4526803179109939Steel is an iron-carbon alloy, which can be used in the most diverse sectors of the economy due to its low manufacturing cost and its chemical and mechanical properties. Refractory materials are part of the manufacture of steel through the composition of the internal lining in the equipment used in the manufacture of the same. Different types of refractory materials can be applied in these equipments, namely: dolomitic, magnesium, aluminous. In the present work, the modification of the thickness of the permanent coating of the steel ladle will be discussed in order to increase the weight of cast steel, performing the necessary measurements and comparisons to guarantee operational safety, obtaining results within the established limits, enabling the change.