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• W3017053607 abstract "In this work, four-layered functionally graded materials (FGMs) are fabricated with nickel (Ni) and alumina (Al2O3) as principle materials. Four FGMs of different compositional layers such as PLS10, PLS15, PLS20 and PLS25 are prepared through powder metallurgy. Developing the Ni/Al2O3 FGMs starts with weighing the elementary powders, blending, stacking and cold compacting followed by pressure-less sintering. The sintering is performed at 1200 °C for 90 min with different cooling rates such as 5 °C/min, 15 °C/min, 20 °C/min and 25 °C/min respectively. In microstructural context, SEM micrographs are the clear evidence for varying microstructure with different percentages of raw materials and cooling rate. Energy dispersive spectroscopy (EDS) technique is used to determine the composition of sintered FGM samples. As a part of mechanical characterization, both green and sintered densities, hardness and flexural strength are evaluated. The results indicate that densities decrease steadily with increased alumina composition and hardness increases with alumina content. The use of PLS15 layer composition with 20 °C/min sinter-cooling rate promoted the best results for the subject FGMs. En este trabajo, los materiales graduados funcionalmente de cuatro capas (FGM) se fabrican con níquel (Ni) y alúmina (Al2O3) como materiales principales. Cuatro FGM de diferentes capas de composición como PLS10, PLS15, PLS20 y PLS25 se preparan a través de pulvimetalurgia. El desarrollo de las FGM de Ni/Al2O3 comienza pesando los polvos elementales, mezclando, apilando y compactando en frío, seguido de sinterización sin presión. La sinterización se realiza a 1200 °C durante 90 min con diferentes velocidades de enfriamiento, como 5 °C/min, 15 °C/min, 20 °C/min y 25 °C/min, respectivamente. En el contexto microestructural, las micrografías SEM son la evidencia clara de la variación de la microestructura con diferentes porcentajes de materias primas y velocidad de enfriamiento. La técnica de espectroscopia de dispersión de energía (EDS) se utiliza para determinar la composición de muestras de FGM sinterizadas. Como parte de la caracterización mecánica, se evalúan las densidades verdes y sinterizadas, la dureza y la resistencia a la flexión. Los resultados indican que las densidades disminuyen constantemente con una mayor composición de alúmina y la dureza aumenta con el contenido de alúmina. El uso de la composición de la capa PLS15 con una velocidad de enfriamiento de sinterización de 20 °C/min promovió los mejores resultados para las FGM del sujeto." @default.
• W3017053607 created "2020-04-24" @default.
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• W3017053607 date "2021-07-01" @default.
• W3017053607 modified "2023-10-16" @default.
• W3017053607 title "Microstructure, hardness and flexural strength of Ni/Al2O3 FGMs by pressure-less sintering with different cooling rates" @default.
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• W3017053607 doi "https://doi.org/10.1016/j.bsecv.2020.03.012" @default.
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