Effects of LaB6 addition on densification behavior, microstructure and mechanical properties of Ti(C,N) based cermets
HUANG Jianhua1, ZHANG Meimei2, KANG Xiyue2, LIN Nan3, YAN Yan1, QIU Song1, LIU Yi1, HE Yuehui2
1. METCERA Co., Ltd., Chengdu 610000, China; 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 3. School of Materials Science and Engineering, Hunan University, Changsha 410083, China
Abstract: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.
黄建华, 张鹛媚, 康希越, 吝楠, 颜焰, 邱嵩, 刘毅, 贺跃辉. LaB6对Ti(C,N)基金属陶瓷致密化及组织与性能的影响[J]. 粉末冶金材料科学与工程, 2020, 25(4): 330-337.
HUANG Jianhua, ZHANG Meimei, KANG Xiyue, LIN Nan, YAN Yan, QIU Song, LIU Yi, HE Yuehui. Effects of LaB6 addition on densification behavior, microstructure and mechanical properties of Ti(C,N) based cermets. Materials Science and Engineering of Powder Metallurgy, 2020, 25(4): 330-337.
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