Engenharia de Materiais (UACSA)

URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2913

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APP - Artigo Publicado em Periódico
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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/0857097292608960
This 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.
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/4639841941851252
Properties 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.
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/4639841941851252
The 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.
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/4526803179109939
Steel 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.
Estudo das propriedades morfológicas e estruturais de CuFe2O4 e CoFe2O4 sintetizadas pelo método de combustão
(2023-02-16) Brito, Aimée Giovanna Jerônimo de; Diniz, Verônica Cristhina de Souza; http://lattes.cnpq.br/9239037374332331; http://lattes.cnpq.br/3353638162487072
The study of advanced ceramic materials such as CuFe2O4 and CoFe2O4 has been, in recent years, of great interest, as it has a wide range of applications such as magneto-optical devices, contrast agent for magnetic resonance imaging, and spintronics. The objective is to evaluate the structural and morphological characteristics of CuFe2O4 and CoFe2O4 synthesized by the combustion method. For the preparation of CuFe2O4 and CoFe2O4, the reagents Copper II nitrate trihydrate PA, iron III nitrate nonahydrate PA, and Cobalt II nitrate (OSO) and Urea P.A as fuel. To carry out the combustion synthesis, two types of containers were used, the beaker and the silica crucible. Flame temperature analyzes were carried out during the analysis, X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Electron Scattering Spectroscopy (EDS). The graphs of time versus average temperature showed that the flame temperatures and the reaction time of CuFe2O4 and CoFe2O4 for the silica crucible container were greater than the syntheses carried out in the beaker container. XRD showed that the synthesis of CuFe2O4 and CoFe2O4 achieved crystallinity and formed an cubic normal spinel phase. SEM showed larger particle size for CuFe2O4 (1 to 10 μm) and CoFe2O4 (1 to 5 μm) synthesized in the silica crucible. The electron EDS showed the composition of elements necessary for formation of the spinel phase of CuFe2O4 and CoFe2O4 produced in both containers. The synthesis of CuFe2O4 and CoFe2O4 by combustion reaction is reproducible for both analyzed containers.
Estudo reológico de argilas utilizadas em indústria de revestimento cerâmico do Cabo de Santo Agostinho – PE
(2022-05-27) Nascimento, Mayara Suellen da Silva; Diniz, Verônica Cristhina de Souza; http://lattes.cnpq.br/9239037374332331; http://lattes.cnpq.br/4750562951278953
Clays are essential components for the production of ceramic coatings, and when they are combined for this purpose, they present different rheological characteristics according to particle size, mineralogical and chemical composition. The present work aims to study the structural, morphological characteristics and the influence of two de-flocculants, sound silicate and sound tripolyphosphate, on the rheology of clay mixtures used in coating coatings. Four clay mixtures were studied with a composition of 50% of four raw materials donated by the coating industryin Cabo de Santo Agostinho – Pernambuco combined with 50% clay also donated by another industry in the sector located in the Northeast region. The clay powders were processed and characterized by X-ray diffraction (XRD) and particle size distribution by laser diffraction. Next, rheology was evaluated by determining deflocculation curves as a function of flow time for clay mixtures in wet suspensions (50% solids). Based on the results, the presence of kaolinite, quartz and mica phases was identified. The morphology of the samples presented different particle size ranges ranging from 0.1 μm to 100 μm. The rheology of the suspensions produced three more viscous samples, with plasticity indices, different from the remaining sample, which presented characteristics of a fluid suspension. None of the clay mixtures indicate thixotropic characteristics. The sodium tripolyphosphate deflocculant promoted the best deflocculation results for all clay mixtures, while the sodium silicate provides overdeflocculation at lower rates.