LaB6对Ti(C,N)基金属陶瓷致密化及组织与性能的影响  

Effects of LaB6 addition on densification behavior,microstructure and mechanical properties of Ti(C,N)based cermets

作　　者：黄建华 张鹛媚 康希越 吝楠 颜焰 邱嵩 刘毅 贺跃辉[2] HUANG Jianhua;ZHANG Meimei;KANG Xiyue;LIN Nan;YAN Yan;QIU Song;LIU Yi;HE Yuehui(METCERA Co.,Ltd.,Chengdu 610000,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;School of Materials Science and Engineering,Hunan University,Changsha 410083,China)

机构地区：[1]美奢锐新材料有限公司,成都610000 [2]中南大学粉末冶金研究院国家重点实验室,长沙410083 [3]湖南大学材料科学与工程学院,长沙410083

出　　处：《粉末冶金材料科学与工程》2020年第4期330-337,共8页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51634006)。

摘　　要：采用传统粉末冶金法制备不同LaB6添加量的Ti(C,N)基金属陶瓷材料,研究LaB6及其添加量对金属陶瓷致密化过程、显微组织与力学性能的影响。结果表明,添加LaB6能加速材料的致密化,尤其是对提高固相烧结过程中材料的致密化速率有显著作用;所制备试样的组织均为典型的核壳结构,但随LaB6添加量增加,生成的缺碳相增加;同时,LaB6能促进Ti(C,N)颗粒向粘结相中固溶,使得材料中Ti(C,N)的平均粒径随LaB6添加量增加而下降。添加质量分数为0.01%的LaB6金属陶瓷材料具有较优的力学性能,其硬度达92.07 HRA,断裂韧性和抗弯强度分别为12.09 MPa/m1/2和1470.85 MPa。The traditional powder metallurgy method was used to prepare Ti(C,N)-based cermet materials with different LaB6 additions.The effects of LaB6 addition on the densification process,microstructure and mechanical properties of cermets were studied.The results show that the addition of LaB6 can accelerate the densification of the material,and especially it has a significant effect on increasing the densification rate of the material during the solid phase sintering process.The microstructure of the prepared samples are typical core-shell structures,but with the increase of the amount of LaB6 addition,the carbon-deficient phase is also increased.At the same time,LaB6 can promote the solid solution of Ti(C,N)particles into the binder phase,so that the average particle size of the black phase Ti(C,N)in the material decreases.The cermet material added with mass fraction of 0.01%LaB6 has good mechanical properties,among which the hardness reaches 92.07 HRA,the fracture toughness and bending strength are 12.09 MPa/m1/2 and 14.785 MPa,respectively.

关 键 词：TI(C N)基金属陶瓷 致密化 LaB6 核壳结构 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]