Affiliation of Author(s):材料科学与技术学院
Journal:JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Key Words:ceramic matrix composites interfaces mechanical properties oxides titanium carbonitride
Abstract:Ti(C,N)-based cermets were fabricated by in situ carbothermal reduction of MoO3 and subsequent liquid sintering in a single heating process. The densification behavior, phase formation, and microstructure evolution of the cermets were characterized by DSC, XRD, SEM, and TEM. The results showed that near-fully dense Ti(C,N)-based cermets with fine carbonitride grains could be obtained by the above-mentioned method. The carbonitride grains of the cermets still exhibited typical core/rim structures and evenly distributed in the binder phase, but the rim phase was more complete and thinner compared with traditional cermets. In addition, the interfaces between the ceramic phase and binder phase of the cermets were atomically smooth, having the orientation relationship of ((1) over bar 1 (1) over bar)(R)//(110)(B) with a perfect coherency state. The prepared Ti(C,N)-based cermets produced with MoO3 showed excellent comprehensive mechanical properties having a transverse rupture strength of 2461 +/- 62 MPa, a Rockwell hardness of 88.0 +/- 0.1 HRA, and a fracture toughness of 22.3 +/- 0.4 MPam(1/2), respectively.
ISSN No.:0002-7820
Translation or Not:no
Date of Publication:2017-04-01
Co-author:周伟,Zhao, Yijie,Zhang, Guotao,dzw,Xiong, Weihao
Correspondence Author:zy
Date of Publication:2017-04-01