LaB<sub>6</sub>对Ti(C,N)基金属陶瓷致密化及组织与性能的影响

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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/m^1/2和1 470.85 MPa。

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	黄建华
	张鹛媚
	康希越
	吝楠
	颜焰
	邱嵩
	刘毅
	贺跃辉

关键词 ： Ti(C,N)基金属陶瓷, 致密化, LaB₆, 核壳结构, 力学性能

Abstract：The traditional powder metallurgy method was used to prepare Ti(C,N)-based cermet materials with different LaB₆additions. 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/m^1/2 and 14.785 MPa, respectively.

Key words： Ti(C,N) based cermets densification behavior LaB₆ core-shell structure mechanical property

收稿日期: 2019-10-21 出版日期: 2020-09-18

ZTFLH:

TB333

基金资助:国家自然科学基金资助项目(51634006)

通讯作者: 贺跃辉,教授,博士。电话：13974870264;E-mail: yuehui@csu.edu.cn

引用本文:

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.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I4/330

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