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纳米TiN增韧SiC陶瓷的显微结构及力学性能

Microstructure and Mechanical Properties of SiC Ceramic Toughened with TiN Nanoparticles

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【Author】 Li Haimiao, Guo Xingzhong, Yang Hui, Fu Peixin, Gao Lihua, Li Zhiqiang, Li Xiangyun(1. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China)(2. Green Building Materials and Applied Technology Engineering Research Center, Zhejiang University, Hangzhou 310027, China)(3. Zhejiang Dongxin Seals Limited Company, Yueqing 325604, China)

【机构】浙江大学材料科学与工程学系；浙江大学绿色建材与应用技术工程研究中心；浙江东新密封有限公司；

【摘要】以纳米TiN和亚微米SiC粉体为原料,采用湿法球磨和喷雾干燥技术制备了均匀分布的SiC/TiN(np)纳米复合粉体,并通过无压烧结工艺制备出SiC/TiN(np)纳米复合陶瓷,研究了纳米TiN颗粒对SiC材料显微结构和力学性能的影响。研究结果表明:纳米TiN的引入抑制了SiC晶粒的生长,材料的断裂方式以沿晶断裂为主,裂纹产生偏转和分义,使材料的抗弯强度、硬度和断裂韧性分别达到557 MPa、21 GPa和6.6 MP·am0.5。更多还原

【Abstract】 SiC/TiN(np) composite nanopowders were prepared by wet milling and spray drying technique with nano-TiN and SiC powders as starting materials, SiC/TiN(np) composite nanoceramic was pressureless sintered, and the effects of TiN nanoparticles on the microstructure and mechanical properties were studied. The results show that the growth of SiC grains are restrained by the introduction of nano-TiN, and the fracture mode of the materials is mainly intergranular. The bending strength, Vickers hardness and fracture toughness of the composite nanoceramic are 557 MPa, 21 GPa and 6.6 MPa·m0.5, respectively.更多还原

【关键词】纳米TiN； SiC；显微结构；力学性能；
【Key words】 nano-TiN； SiC； microstructure； mechanical properties；

【基金】浙江省重大科技攻关项目(2006C11184)资助

【文献出处】稀有金属材料与工程 ,Rare Metal Materials and Engineering , 编辑部邮箱 ,2008年S2期

【分类号】TQ174.1
【被引频次】6
【下载频次】118

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