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Fabrication and Characterization of Composite Materials Made from Intermetallic Compounds and Zirconia Ceramics

金属间化合物与氧化锆陶瓷复合材料的制备与表征

基本信息

批准号：
07650801
负责人：
YAMAGUCHI Osamu
金额：
$ 1.28万
依托单位：
Doshisha University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

Intermetallic compounds, MoSi_2, WSi_2, TiC,TiB_2, and TiN,are considerable of interest from views points such as high melting points, excellent high-temperature oxidation resistance, hardness, and good heat conductor. The main difficulty with these materials is an inherent lack of thoughness, which limits their applications. They need to be reinforced in order to improve their mechanical properties. In the present study, ZrO_2 has been proved to be a very attractive reinforcement material for these intermetallic compounds. Dense sintered composites of ZrO_2 (2mol% Y_2O_3) and these intermetallic compounds have been fabricated by hot isostatic pressing (HIPing) for 2 h under 196 MPa at 1400ﾟ to 1500ﾟC.Their mechanical and electrical properties have been evaluated in connection with their compositions and microstructures. On the other hand, little attention has been paid to the fabrication and measurement of properties of laminated materials of composites between ceramics and intermetallic compounds. On the basis of the present results, dense laminated materials with the compositions of ZrO_2 (2Y)/MX=(60/40)/(80/20)/(60/40)mol% (MX=MoSi_2, WSi_2), (50/50)/(80/20)/(50/50) (MX=TiC), and (40/60)/(70/30)/(40/60) (MX=TiN) have been prepared by HIPing. Overall electric resistivities in directions perpendicular and parallel to the interfaces are insulative (<approximately equal>10^<11> OMEGA・cm) and conductive (<approximately equal>10^<-4> OMEGA・cm), respectively. Residual stresses of as much as 150-200 MPa are induced near the interfaces. The fracture toughnesses are greatly affected by the residual stresses.

金属间化合物MoSi_2、WSi_2、TiC、TiB_2、TiN等由于熔点高、高温抗氧化性优异、硬度高、导热性好等优点而备受关注。这些材料的主要困难是固有的缺乏强度，这限制了它们的应用。需要对其进行加固以提高其机械性能。在本研究中，ZrO_2已被证明是一种非常有吸引力的金属间化合物增强材料。在196 MPa、1400℃至1500℃下热等静压(HIPing) 2 h，制备了ZrO_2 (2mol% Y_2O_3)和这些金属间化合物的致密烧结复合材料。通过成分和微观结构评估了它们的机械和电性能。另一方面，陶瓷和金属间化合物复合材料层压材料的制备和性能测量却很少受到关注。在此基础上,制备了组成为ZrO_2(2Y)/MX=(60/40)/(80/20)/(60/40)mol%(MX=MoSi_2,WSi_2)、(50/50)/(80/20)/(50/50)(MX=TiC)的致密层状材料,以及(40/60)/(70/30)/(40/60) (MX=TiN) 是通过 HIPing 制备的。垂直和平行于界面的方向上的总电阻率分别为绝缘性（<约等于>10^<11>OMEGA·cm）和导电性（<约等于>10^<-4>OMEGA·cm）。界面附近会产生高达 150-200 MPa 的残余应力。残余应力对断裂韧性影响很大。