Salvo Christopher, Chicardi Ernesto, Poyato Rosalía, García-Garrido Cristina, Jiménez José Antonio, López-Pernía Cristina, Tobosque Pablo, Mangalaraja Ramalinga Viswanathan
Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad del Bío-Bío, Concepción 4081112, Chile.
Departamento de Ingeniería y Ciencia de Materiales y del Transporte, Universidad de Sevilla, 41092 Sevilla, Spain.
Materials (Basel). 2021 Apr 26;14(9):2217. doi: 10.3390/ma14092217.
MAX phases are an advanced class of ceramics based on ternary carbides or nitrides that combine some of the ceramic and metallic properties, which make them potential candidate materials for many engineering applications under severe conditions. The present work reports the successful synthesis of nearly single bulk TiAlN MAX phase (>98% purity) through solid-state reaction and from a Ti and AlN powder mixture in a molar ratio of 2:1 as starting materials. The mixture of Ti and AlN powders was subjected to reactive spark plasma sintering (SPS) under 30 MPa at 1200 °C and 1300 °C for 10 min in a vacuum atmosphere. It was found that the massive formation of AlO particles at the grain boundaries during sintering inhibits the development of the TiAlN MAX phase in the outer zone of the samples. The effect of sintering temperature on the microstructure and mechanical properties of the TiAlN MAX phase was investigated and discussed.
MAX相是一类基于三元碳化物或氮化物的先进陶瓷，兼具一些陶瓷和金属特性，这使其成为许多严苛条件下工程应用的潜在候选材料。本工作报道了通过固态反应，以摩尔比为2:1的Ti和AlN粉末混合物作为起始原料，成功合成了纯度近98%的块状TiAlN MAX相。将Ti和AlN粉末混合物在真空气氛中于30MPa压力、1200℃和1300℃下进行反应性放电等离子烧结（SPS）10分钟。研究发现，烧结过程中晶界处大量形成的AlO颗粒会抑制样品外层区域TiAlN MAX相的生成。研究并讨论了烧结温度对TiAlN MAX相微观结构和力学性能的影响。
