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Fabrication of Ti(C,N)‐based cermets by in situ carbothermal reduction of MoO 3 and subsequent liquid sintering
Author(s) -
Zhou Wei,
Zheng Yong,
Zhao Yijie,
Zhang Guotao,
Dong Zuowei,
Xiong Weihao
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14691
Subject(s) - cermet , sintering , materials science , rockwell scale , carbothermic reaction , ceramic , microstructure , phase (matter) , fracture toughness , fabrication , flexural strength , composite material , metallurgy , carbide , chemistry , medicine , alternative medicine , organic chemistry , pathology
Ti(C,N)‐based cermets were fabricated by in situ carbothermal reduction of MoO 3 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 ¯ 1 1 ¯) R //(110) B with a perfect coherency state. The prepared Ti(C,N)‐based cermets produced with MoO 3 showed excellent comprehensive mechanical properties having a transverse rupture strength of 2461±62 MP a, a Rockwell hardness of 88.0±0.1 HRA , and a fracture toughness of 22.3±0.4 MP a·m 1/2 , respectively.