Effect of La₂O₃ Addition on the Microstructure and Mechanical Properties of TiC-Based Cermets

Abstract:

TiC-based cermets with four different components of La₂O₃ content were prepared via vacuum sintering to investigate the effect of La₂O₃ addition on the microstructure and mechanical properties. The microstructure and phase structure were investigated by XRD, SEM, EDS and the mechanical properties were measured. Experimental results show that TiC-based cermets with La₂O₃ addition were also a typical core-rim structure but did not form a new phase. Along with the increase of La₂O₃ content, the density of TiC-based cermets was reduced, EDS analysis revealed La₂O₃ was partly dissolved in the Mo/Ni binder and hindered dissolution and separation of carbides. A moderate amount of La₂O₃ can favor the microstructure refinement and improve its mechanical properties in the form of La₂O₃ particles embedded in Mo/Ni particles. Compared with undoped sample, the cermets doped with 1 wt.% La₂O₃ showed optimum comprehensive properties: the bending strength of 1041.4 MPa, Vickers hardness of 13.19 GPa and the fracture toughness of 14.18 MPa• m^1/2.

• Periodical: Applied Mechanics and Materials (Volumes 633-634)
• Pages: 355-359
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.633-634.355
• Online since: September 2014
• Authors: Jia Xie, De Kai Li, Lian Chao Wang, Yun Xi
• Keywords: Core-Rim Structure, Fracture Toughness, La₂O₃, TiC-Based Cermets

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