Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7886813 | Ceramics International | 2018 | 9 Pages |
Abstract
In this study, Ti(C,N)-WC-NbC-ZrC-Co-Ni cermets were prepared by sintering-hip at 1450â¯Â°C. The effect of ZrC addition on the microstructure, mechanical properties, oxidation resistance and wear resistance of Ti(C,N)-WC-NbC-Co-Ni cermets were explored in detail. The results show that ZrC addition plays the role of inhibitor in the dissolution-reprecipitation process, which can increase the wear-resistant carbide phases and inhibit the precipitation of brittle (Ti,W,Nb)(C,N) rim phase. Therefore, the core-rim structures are refined and the Nb content in binder increases, which enhance mechanical properties and oxidation resistance of cermets. With the increasing ZrC content, the oxidation resistance of cermets can be improved constantly, while the transverse rupture strength, fracture toughness and wear resistance of these cermets increase first and then decrease. The cermet with 1â¯wt% ZrC exhibits the transverse rupture strength of 2549â¯MPa and highest fracture toughness of 13.0â¯MPaâ¯m1/2. The oxidation weight gain of cermets containing 5â¯wt% ZrC after holding 100â¯h at 750â¯Â°C in air is 2.8â¯Ãâ¯10â6 gâ¯mmâ2, which is only 22% of that in the cermets without ZrC addition.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Xiyue Kang, Nan Lin, Yuehui He, Meimei Zhang,