WC含量对TiB_(2)基金属陶瓷微观组织与力学性能的影响  

Effects of WC content on the microstructure and mechanical properties of TiB_(2)-based cermets

作　　者：王帅[1] 汪建英 娄嘉 汪炯[1] 张翔[1] 杨海林[1] WANG Shuai;WANG Jianying;LOU Jia;WANG Jiong;ZHANG Xiang;YANG Hailin(State Key Laboratory of powder metallurgy,Central South University,Changsha 410083,China;School of materials science and engineering,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]中南大学,粉末冶金国家重点实验室,长沙410083 [2]湘潭大学材料科学与工程学院,湘潭411105

出　　处：《粉末冶金材料科学与工程》2021年第4期298-305,共8页Materials Science and Engineering of Powder Metallurgy

摘　　要：采用粉末冶金法制备w(WC)为0~20%的TiB_(2)-WC-0.8Cr3C2-20(Co/Ni)(质量分数,%)金属陶瓷,研究WC含量对TiB_(2)基金属陶瓷微观组织与力学性能的影响。结果表明,随WC含量增加,TiB_(2)在黏结相中的溶解度降低,TiB_(2)/黏结相界面减少,使得TiB_(2)基金属陶瓷晶粒细化,晶粒尺寸更加均匀。此外,添加WC可显著改善TiB_(2)基金属陶瓷的力学性能。当w(WC)为15%时,金属陶瓷的性能最佳,硬度(HRA)、抗弯强度以及相对密度分别达到92.6±0.2、(1256±30)MPa和(99.65±0.20)%。但添加过量WC(w(WC)=20%)时部分WC相发生团聚并生成脱碳相W_(2)C,使得TiB_(2)基金属陶瓷的力学性能降低。The TiB_(2)-WC-0.8Cr3C2-20(Co/Ni)(mass fraction,%)cermets(w(WC)are 0-20%)with high-density were prepared by powder metallurgy(P/M)method.The effects of WC content on the microstructure and mechanical properties of TiB_(2)-based cermets were investigated.The results indicate that with the increase of WC content,the solubility of TiB_(2) in the bonded phase decreases,and the TiB_(2)/bonded phase interface decreases,which makes the grains of TiB_(2) based cermets finer and more uniform.In addition,the addition of WC can significantly improve the mechanical properties of TiB_(2) based cermets.When w(WC)is 15%,the properties of cermets are the best,and the hardness(HRA),bending strength and relative density reach 92.6±0.2,(1256±65)MPa and(99.65±0.20)%,respectively.However,the addition of excessive WC(20%)will lead to the partial agglomeration of WC phase and the formation of decarburized phase W_(2)C,which will reduce the mechanical properties of TiB_(2) based cermets.

关 键 词：力学性能 微观组织 TiB_(2)基金属陶瓷 WC添加 晶粒细化 

分 类 号：TG148[一般工业技术—材料科学与工程]