颜建辉,黄金鑫,李凯玲,汪异

• 1:湖南科技大学材料科学与工程学院
• 2:湖南科技大学高温耐磨材料及制备技术湖南省国防科技重点实验室

摘要(Abstract)：

以Mo,Si粉为原料,采用放电等离子烧结(SPS)原位制备MoSi_2-Mo_5Si_3复合材料,研究不同烧结工艺下材料的微观组织和室温力学性能,并探讨Mo_5Si_3含量对复合材料力学性能、高温氧化和高温摩擦磨损性能的影响。结果表明:在1200℃温度以上SPS能够合成MoSi_2-Mo_5Si_3复合材料。随着烧结温度的升高,复合材料的致密化效果明显加强,但其硬度、抗弯强度和断裂韧性都呈现先升高再降低的趋势;随着烧结压力的提高,复合材料的致密度、硬度和抗弯强度增加,断裂韧性先提高后保持不变;保温时间由3 min增加到9 min时,复合材料的力学性能先提高然后基本保持不变。Mo_5Si_3含量为25%时,MoSi_2-Mo_5Si_3复合材料的力学性能最佳,其相对密度为98.72%,硬度、抗弯强度和断裂韧性分别为11.27 GPa、331 MPa和5.33 MPa·m~(1/2)。随着Mo_5Si_3含量增加,MoSi_2-Mo_5Si_3复合材料在1200℃的高温抗氧化性能和1000℃的高温耐磨性能都逐渐降低。

关键词(KeyWords)： MoSi2-Mo5Si3复合材料;放电等离子烧结;力学性能;氧化行为;高温摩擦磨损

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51475161);; 湖南省教育厅科研重点项目(15A059)

作者(Author): 颜建辉,黄金鑫,李凯玲,汪异

DOI: 10.13289/j.issn.1009-6264.2017-0169

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