SPS制备致密Ti_3SiC_2/Al复合材料的组织及性能研究

Microstructure and Properties of Dense Ti_3SiC_2/Al Composites Prepared by SPS

采用脉冲放电等离子烧结(SPS)方法制备了Ti_3SiC_2/Al基复合材料,研究了烧结温度和时间对复合材料组织及性能的影响。结果表明,Ti_3SiC_2颗粒在SPS制备过程中未发生显著分解,复合材料在制备过程中也未发生明显的界面反应,外加增强体颗粒形状完整,均匀分布于基体晶粒的晶界处。随着烧结温度的升高,复合材料的致密度和硬度逐渐增大,摩擦系数和磨损量逐渐减小。随着烧结时间的延长,致密度和硬度先增大后减小,摩擦系数和磨损量先降低后增加。当烧结温度为600℃、烧结时间为10 min时,复合材料致密度达96.6%,显微硬度达38 HV0.2,稳定干摩擦系数约为0.3,磨损量0.32!10-2g。

The Ti3SiC2/Al composites were prepared by the Spark Plasma Sintering（ SPS）technology. The effects of sintering temperature and time on the microstructure and properties of the composites were investigated. The results show that Ti3SiC2 particles didn＇ t decompose significantly during the preparation process and there was no significant evidence of interfacial reaction between Ti3SiC2 and Al matrix,and the shape of reinforcing particles were complete which distribute uniformly on the matrix grain boundaries. With sintering temperature increasing, the density and the hardness gradually increased,whereas the friction coe-fficient and wear volume gradually decreased. With the extension of sintering time,the density and hardness first-ly increased and then decreased,while the friction coefficient and wear volume firstly decreased and then increased. When the samples sinter at600 ℃ and stay 10 min,the density of composites hit to 96. 6% and Vickers Hardness reach to 38 HV0. 2,stable friction coefficient was about 0. 3 and wear amount is 0. 32 × 10^-2 g.