Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 27, Issue 3, Pages 521-527Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2008.10.006
Keywords
TiC-TiN based cermet; Microstructure; Mechanical properties
Funding
- European Community [STRP 505541-1]
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The objective of this work is to develop materials with both a good hardness and a good toughness. Titanium carbonitride has a significant hardness (2000H(v)), but its toughness (6 MPa root m) is insufficient for tools applications. Toughness can be improved by addition of a metallic binder. Cermets based on TiC and TiN with Ni as binder are the most developed materials. In the present work, the effect of TiN addition and binder content on the microstructure and the properties of the TiC based cermets elaborated by pressureless sintering have been investigated. Results show that dense cermets with specific core/rim structure have been obtained. The rupture strength and the toughness increase with the addition of Ni. The optimum values of mechanical properties were found for the cermet with 15 wt% Ni and 10 wt% TiN addition, respectively, which exhibits a Vickers hardness over 1400H(V0.3) and a fracture toughness around 13.6 MPa root m. (C) 2008 Elsevier Ltd. All rights reserved.
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