Effect of Ni-Ti-Cr Solid Solution on Microstructure and Properties of Ti(C,N)-Based Cermets AITranslate

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Chinese Library Classification Number:TG148[金属学及工艺—金属材料]

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Ti(C,N)-based cermets were prepared with mechanically alloyed Ni-Ti-Cr solid solution as the binder.The effects of solid solution with different Cr contents on microstructure,mechanical properties and oxidation behavior of the cermets were studied.The results show that with the increase of Cr content,the particle size of the cermets decreases at first and then increases,while bending strength,fracture toughness and hardness increase at first and then decrease.When the mass ratio of Ni,Ti and Cr is 91∶3∶6,the cermets have the best comprehensive performance:The bending strength,fracture toughness and hardness reach 2120.3 MPa,15.41 MPa·m^1/2and 88.9 HRA,respectively;the oxide film is dense,and the oxidation weight gain and peeling of the oxide film are inconspicuous.After oxidation for 60 h,the outer oxide film of the cermets is dominated by NiO,and TiO₂is mainly embedded in the NiO grain boundary.The loose TiO₂layer is formed inwardly,and the Cr element is enriched further inwardly,forming dense NiO and NiCr₂O₄layer that could effectively absorb oxygen atoms,hinder further oxidation,and play a role in connecting and transiting between layers.During cyclic oxidation,the peeling of the oxide film of the cermets is a cyclic process from NiO layer to TiO₂layer.