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以Al粉为烧结助剂,采用无压烧结工艺于1600℃下保温3 h烧制SiC陶瓷材料,研究了不同Al粉粒度及其添加量对SiC陶瓷材料结构和性能的影响。结果表明:Al粉可促进SiC陶瓷材料的烧结和力学性能的提高,同时起抗氧化的作用,且粒度较小的Al粉对其性能提升的幅度较大。当添加4wt%粒度为48μm的Al粉时,SiC陶瓷材料的性能较佳,体积密度和显气孔率分别为2.69 g/cm~3和5.8%,显微硬度和抗折强度分别为2790 HV和189MPa。SiC陶瓷材料烧结性能和力学性能的提高可归因于Al粉的促烧结作用,及其氧化产物Al_2O_3和原位生成的少量莫来石分布在SiC颗粒间所起的强化作用。
SiC powder was sintered at 1600 ℃ for 3 h by sintering with sintering aids as sintering aids. The effects of different Al powder sizes and their additions on the structure and properties of SiC ceramics were investigated. The results show that Al powder can promote the sintering and mechanical properties of SiC ceramics, and at the same time, it can resist the oxidation. Al powder with smaller particle size can improve the properties of SiC ceramics greatly. When 4wt% Al powder with a particle size of 48μm was added, the properties of SiC ceramics were better, the bulk density and apparent porosity were 2.69 g / cm ~ 3 and 5.8% respectively, the microhardness and flexural strength were 2790 HV and 189MPa. Sintering properties and mechanical properties of SiC ceramics can be attributed to the sintering-promoting effect of Al powders and the strengthening effect of Al 2 O 3 oxidation products and a small amount of mullite distributed in situ between SiC particles.