SiC纤维增强AlN-SiC复合材料的制备及力学性能

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摘要以AlN、SiC和SiC纤维为主要原料,采用放电等离子烧结法(SPS)制备SiC纤维增强AlN-SiC陶瓷复合材料。采用金相分析、扫描电镜及复合材料力学性能测试等手段,研究不同烧结温度和SiC纤维含量对复合材料的微观组织、物相组成、力学性能、导热性能等的影响规律。研究结果表明：国产SiC纤维SPS制备AlN-SiC陶瓷基复合材料最适宜的烧结温度为1 650 ℃。掺入少量SiC纤维能够有效改善AlN-SiC复合材料的力学性能。掺入SiC纤维质量分数为5%时,AlN-SiC复合材料力学性能最优,抗弯强度达到241.36 MPa,硬度为569.48 N,断裂韧性为11.66 MPa·m^1/2。

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	王鸿飞
	李国栋
	孙晔华
	李丹
	熊薇

关键词 ：陶瓷基复合材料, 放电等离子烧结, SiC纤维, AlN-SiC复相陶瓷, 力学性能

Abstract：Silicon carbide fiber reinforced AlN-SiC ceramic composite was fabricated by spark plasma sintering (SPS), using AlN, SiC and SiC fibers as main raw materials. By means of metallographic analysis,scanning electron microscopy (SEM) and mechanical properties test, the effects of sintering temperature and content of SiC fibers on the microstructure,phase composition,mechanical properties and thermal conductivity of the composites were studied. The results show that the optimum temperature for preparing AlN-SiC ceramic matrix composites with domestic SiC fibers by SPS method is 1 650 ℃. Adding a small amount of SiC fibers can effectively improve the comprehensive properties of AlN-SiC composite ceramics. When the content of SiC fibers is 5%, the comprehensive property of AlN-SiC composite ceramics is the best, the bending strength is 241.36 MPa, the hardness is 569.48 N, and the fracture toughness is 11.66 MPa·m^1/2.

Key words： ceramic matrix composites spark plasma sintering SiC fiber AlN-SiC composite ceramics mechanical properties

收稿日期: 2018-12-10 出版日期: 2019-07-11

ZTFLH:

TG146.2⁺3

基金资助:GFKJ创新特区项目(17-163-**ZT-***-15-01)

通讯作者: 李国栋,教授,博士。电话：13087317973;E-mail: lgd63@163.com

引用本文:

王鸿飞, 李国栋, 孙晔华, 李丹, 熊薇. SiC纤维增强AlN-SiC复合材料的制备及力学性能[J]. 粉末冶金材料科学与工程, 2019, 24(3): 232-238.
WANG Hongfei, LI Guodong, SUN Yehua, LI Dan, XIONG Wei. Fabrication and mechanical properties of silicon carbide fiber reinforced AlN-SiC composites. Materials Science and Engineering of Powder Metallurgy, 2019, 24(3): 232-238.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2019/V24/I3/232

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