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Effects of TiB2 Content on the Microstructures and Mechanical Properties of Low-Cobalt Ti(C,N)-TiB2 Cermets Fabricated by Vacuum Hot Pressing.
- Source :
- Journal of Wuhan University of Technology; Oct2019, Vol. 34 Issue 5, p1077-1084, 8p
- Publication Year :
- 2019
-
Abstract
- Ti(C,N)-TiB<subscript>2</subscript> cermets were fabricated from Ti(C,N), TiB<subscript>2</subscript>, Co and WC powder mixtures via a vacuum hot pressing process. The influence of TiB<subscript>2</subscript> content on their microstructures and mechanical properties was investigated. As a result of the elevated TiB<subscript>2</subscript> contents, two types of core-rim microstructures were present in the Ti(C,N)-TiB<subscript>2</subscript> cermets, and remarkably improved mechanical properties were achieved. With the increase of TiB<subscript>2</subscript> content, the flexural strength, fracture toughness and hardness of the Ti(C,N)-TiB<subscript>2</subscript> 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<subscript>2</subscript> cermets with 20 wt% TiB<subscript>2</subscript> 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<superscript>1/2</superscript> and 1 114 MPa, respectively. The underlying mechanism for their enhanced properties was studied in detail. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10002413
- Volume :
- 34
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Journal of Wuhan University of Technology
- Publication Type :
- Academic Journal
- Accession number :
- 139007429
- Full Text :
- https://doi.org/10.1007/s11595-019-2162-3