Ti-B-C体系复相陶瓷的制备及性能研究  

Research on the synthesis and properties of Ti-B-C multiphase ceramics

作　　者：朱春城[1] 林红[2] 梁桂英[2] 李庆芬[1] 

机构地区：[1]哈尔滨工程大学机电工程学院,哈尔滨150001 [2]哈尔滨师范大学化学系,哈尔滨150025

出　　处：《粉末冶金技术》2007年第3期194-198,共5页Powder Metallurgy Technology

基　　金：黑龙江省博士后科研基金资助项目(LBH-Z05064);黑龙江教育厅基金资助项目(11511109)

摘　　要：以Ti、B和C粉末为原料,采用自蔓延高温合成工艺制备了不同组份的TiC-TiB2复相陶瓷。分析了不同TiB2含量材料的力学性能、断口形貌和裂纹扩展情况,研究表明:TiC-TiB2复相陶瓷比其单相陶瓷材料的断裂韧度有较大提高,当n(TiB2)∶n(TiC)=56.4∶43.6,该复相陶瓷的弯曲强度和断裂韧度达到最大值,且相对密度高达99.4%;长棒状TiB2颗粒能有效改善材料的断裂韧度和强度,其强化机理主要为裂纹偏转和拔出效应。TiC-TiB2 multiphase ceramics with different mole ratios were produced by SHS and pseudo hot isostatic pressing using Titanium, Boron and Carbon powders. The mechanical properties and microstructure of multiphase ceramics were investigated by a series of experiments. The results show that fracture toughness of TiC-TiB2 multiphase ceramics are higher than that of single-phase ceramics. When TiB2 ： TiC = 56.4 ： 43.6（ mol % ）, bending strength and fracture toughness of TiC-TiB2 multiphase ceramics are highest, and relative density is 99.4 %. The presence of the TiB2 particles could improve fracture toughness and strength, its strengthening mechanism is due to the crack deflection and extraction effect.

关 键 词：TiC-TiB2复相陶瓷 力学性能 强化机理 

分 类 号：TQ174.758[化学工程—陶瓷工业]