Effects of TiB2 Content on the Microstructures and Mechanical Properties of Low-Cobalt Ti(C,N)-TiB2 Cermets Fabricated by Vacuum Hot Pressing

Ti(C,N)-TiB 2 cermets were fabricated from Ti(C,N), TiB 2 , Co and WC powder mixtures via a vacuum hot pressing process. The influence of TiB 2 content on their microstructures and mechanical properties was investigated. As a result of the elevated TiB 2 contents, two types of core-rim microstructur...

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Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2019-10, Vol.34 (5), p.1077-1084
Main Authors: Fang, Yihang, Zhang, Mengxian, Zhao, Xianrui, Feng, Shangshen, Peng, Wenyi, Chen, Nan, Du, Guoping
Format: Article
Language:English
Subjects:
Advanced Materials
Cermets
Chemistry and Materials Science
Density
Flexural strength
Fracture toughness
Hardness
Hot pressing
Intergranular fracture
Materials Science
Mechanical properties
Titanium diboride
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Summary:Ti(C,N)-TiB 2 cermets were fabricated from Ti(C,N), TiB 2 , Co and WC powder mixtures via a vacuum hot pressing process. The influence of TiB 2 content on their microstructures and mechanical properties was investigated. As a result of the elevated TiB 2 contents, two types of core-rim microstructures were present in the Ti(C,N)-TiB 2 cermets, and remarkably improved mechanical properties were achieved. With the increase of TiB 2 content, the flexural strength, fracture toughness and hardness of the Ti(C,N)-TiB 2 cermets first increased, and then decreased, while their relative density consistently decreased. Attributed to an integration of the intergranular and intrangranular fracture behaviors, the Ti(C,N)-TiB 2 cermets with 20 wt% TiB 2 content exhibited the best overall properties with the relative density, hardness, fracture toughness and flexural strength at 99.3%, 1 995 H V, 7.92 MPa·m 1/2 and 1 114 MPa, respectively. The underlying mechanism for their enhanced properties was studied in detail.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-019-2162-3