Affiliation of Author(s):材料科学与技术学院
Journal:VACUUM
Key Words:Al2O3-Cr cermets TiO2 addition Densification Microstructure Vacuum sintering
Abstract:Five cermets with composition of Cr-(45-x)Al2O3-xTiO(2) (x = 0, 2, 4, 8 and 16 wt%) were prepared by vacuum sintering. The effects of TiO2 addition on the densification behavior, phase composition, microstructure and transverse rupture strength (TRS) of the prepared cermets were studied. The addition of TiO2 decreased effectively the full densification temperature of Al2O3-Cr cermets from 1700 degrees C to 1500 degrees C. A new Cr2Ti6O15 phase formed in the Al2O3-Cr cermets with 216 wt% TiO2 additions sintered at 1500 degrees C, and its volume fraction increased gradually with increasing TiO2 additions. The Cr2Ti6O15 phase improved the microstructure and decreased the porosity for cermets with 2 wt% TiO2 additions, accordingly resulting in the highest TRS of 447 MPa. However, when the addition of TiO2 exceeded 8.0 wt%, lots of residual pores exhibited in the Cr2Ti6O15 phase of those cermets, obviously reducing the TRS. (C) 2017 Elsevier Ltd. All rights reserved.
ISSN No.:0042-207X
Translation or Not:no
Date of Publication:2017-12-01
Co-author:Zhao, Yijie,Ding, Weimin,周伟,Zhang, Guotao,Liu Zili,Yu, Lixin
Correspondence Author:zy
Date of Publication:2017-12-01