β-SiAlON-cBN陶瓷复合材料的制备与性能  

Preparation and properties of β-SiAlON-cBN ceramic composites

作　　者：岳新艳[1] 何超[1] 石晓飞[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,沈阳110819

出　　处：《材料与冶金学报》2014年第4期288-292,共5页Journal of Materials and Metallurgy

基　　金：国家科技部重大专项课题项目(2012ZX04003-061);中央财政专项资金(N120510002;N13081003);辽宁省高校优秀人才支持计划(LJQ2013023)

摘　　要：采用放电等离子烧结(SPS)在1 500℃下制备不同立方氮化硼(cubic Boron Nitride,即cBN)含量的β-SiAlON-cBN陶瓷复合材料,研究cBN含量对陶瓷复合材料的物相组成、显微组织和性能的影响.XRD分析表明:在添加复合烧结助剂的条件下合成的β-SiAlON-cBN陶瓷复合材料,β-SiAlON的量随着cBN含量的增加而增加.FESEM观察结果表明:cBN颗粒较均匀地分布在β-SiAlON基体中,一些cBN颗粒表面出现可剥离的层片状物质六方氮化硼(hBN).随着cBN含量的增加,β-SiAlON-cBN陶瓷复合材料的相对密度先下降后略有上升,硬度呈现降低趋势,断裂韧性则先升高后略有降低.β-SiAlON-10%cBN(质量分数)的相对密度和硬度分别为96.8%和13 GPa,β-SiAlON-30%cBN的断裂韧性可达到KIC=3.2 MPa·m1/2.β - SiAlON - cBN ceramic composites with different cBN were prepared by spark plasma sintering （SPS） at 1 500 ℃. Effect of cBN on the phase compositions, microstructures and properties of β - SiAlON - cBN composites was investigated. XRD analyses revealed that β - SiAlON - cBN composites can be prepared by doped multiple additives, and amount of β- SiAlON phase increases with increment of cBN. FESEM results showed that the cBN particles distribute in the β - SiA1ON matrix homogeneously and a lameUar phase is observed around some cBN particles in the polished samples. Moreover, the relative density and the hardness decrease with increment of the cBN except for that of β- SiAlON -40% cBN, while the fracture toughness increases first and then decreases slightly. For β - SiAlON - 10 % cBN composites, the optimum hardness and the highest relative density were 96. 8% and 13 GPa. For β - SiAlON - 30 % cBN composites, the highest fracture toughness was K_IC = 3.2 MPa ·m^1/2.

关 键 词：Β-SIALON CBN 放电等离子烧结 显微组织 性能 

分 类 号：TB333[一般工业技术—材料科学与工程]