Affiliation of Author(s):材料科学与技术学院
Journal:INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Key Words:Mo2FeB2-based cermets Two-step sintering technique Microstructure Mechanical properties
Abstract:Ternary boride based cermets were prepared by two-step sintering technique. The first pre-coarsening step was short at a relatively high-temperature in order to yield critical density and render pores unstable. The second step at lower temperatures for long holding duration facilitated further densification with limited grain growth occurring by the slower grain-boundary diffusion. It was shown that for fine-grained Mo2FeB2-based cermets, the optimum processing condition included pre-coarsening temperature (T-1) = 1160 degrees C, pre-coarsening duration (t(1)) = 30 min, subsequent sintering temperature (T-2) = 1080 degrees C and (t(2)) = 20 h. The cermets exhibited excellent mechanical properties with the transverse rupture strength of 2139.5 MPa and the hardness of 90.2HRA. Compared to conventional vacuum sintering, the grain size of the cermets prepared by two-step sintering technique was reduced from 1.89 mu m to 1.21 mu m.
ISSN No.:0263-4368
Translation or Not:no
Date of Publication:2018-04-01
Co-author:Zhang, Jiajie,Chen, Jixin,周伟,Zhao, Yijie,Feng, Ping
Correspondence Author:zy
Date of Publication:2018-04-01