W-Co硬质合金表面氧化层是什么?被氧化后是什么颜色?

Carbide has been well received by researchers of all ages. However, the conventional WC-Co cemented carbide has not been satisfied in extreme conditions of demand for modern industry, coupled with the current high cost of W and Co, as a result of substituting Co with Ni alloy binder phase, and also used Ti (C, N) partially replace the WC carbide YT class emerged. As compared to the traditional YT class carbide WC-Co cemented carbide has a higher hardness, wear resistance, corrosion resistance and high temperature stability, while maintaining the toughness of cemented carbide. So YT class carbide has been a great emphasis on, and growing rapidly. But few studies of high-Ti alloy microstructure and properties. Therefore, this project explores the different WC and Ti (C, N) the percentage of high quality Ti-WC-Ni alloy microstructure and properties of. Ball milling for 72 hours at a temperature of 1440 ℃ vacuum sintering, to give 5 set of experimental samples, test specimens porosity, density, hardness, bending strength, and the sample was observed by SEM, and the microstructure of the microstructure of the flexural fracture organize, and use to characterize the microstructure variation of the mechanical properties of the reasons. Was prepared from five different WC and Ti (C, N) carbide sample mass percentage, the ratio of A 2:6, B 3:5, C 4:4, D 5:3, E 6:2 . The experimental results show that: with Ti (C, N) mass percentage increases, tissue black core / gray ring structure gradually increased, white core / gray ring structure gradually decreased; sample density decreased and the decrease in the C group, fastest, 0.72%; specimen hardness gradually increased, and the fastest growing in the C group for 0.6 HRA; specimen bending strength gradually decreased, and the fastest decline in the C group, is 221Mpa. By scanning electron microscopy of fracture observed, which is mainly transgranular fracture.