烧结温度对SiC陶瓷基复合材料组织及力学性能的影响

Effect of Sintering Temperature on Microstructure and Mechanical Property of SiC Ceramics Matrix Composites

以β-SiC为原始粉体,利用放电等离子烧结(SPS)工艺1 800℃和1 900℃制备了BAS/SiC陶瓷基复合材料.采用阿基米德排水法、XRD、SEM及三点弯曲等分析测试手段研究了复合材料的致密度、物相组成、微观结构及室温力学性能.结果表明,随着烧结温度升高,复合材料的致密度和室温力学性能增加,而复合材料的物相中没有发现β-SiC向α-SiC的转变,这可能是由于SPS烧结速度较快相对而言烧结时间较短造成的.

BAS/SiC composites were synthesized by sparking plasma sintering （SPS） at 1800℃ and 1900℃, respectively with β-SiC starting powders. Densification, phase composition, microstructure and room-temperature mechanical properties of the composites were studied by means of Archimedes＇ principle, XRD, SEM and three-point bending methods. The results showed the relative densities and mechanical properties of the composites increased with the sintering temperature increasing. No phase transformation happened from β-SIC to α-SiC, this could be due to the rapid sintering and short sintering time.