Preparation and high temperature oxidation properties of TiC−NiCrCoMo steel bonded cemented carbides

The TiC‒NiCrCoMo steel bonded cemented carbides with high temperature oxidation resistance were prepared by powder metallurgy technology, using nickel-based alloys (NiCrCoMo) as the binder phase and titanium carbide as the hard phase. The TiC‒NiCrCoMo steel bonded cemented carbides with the best comprehensive performance were obtained by the optimization of the sintering process. The oxidation kinetics curves of the TiC‒NiCrCoMo steel bonded cemented carbides at different temperatures were measured, and the microstructure of the oxide layer was analyzed. The results show that, the TiC‒NiCrCoMo steel bonded cemented carbides with the best comprehensive performance are obtained by sintering at 1280 ℃ with the density of 6.01 g/cm³, the hardness of HRC 65, and the flexural strength of 1100 MPa. With the increase of the oxidation temperature, the oxidation degree of the TiC‒NiCrCoMo steel bonded cemented carbides increases significantly. Compared with the oxidation kinetics curves of 316L stainless steel bonded cemented carbides, the TiC‒NiCrCoMo steel bonded cemented carbides show the excellent high temperature oxidation resistance.