WC-Co has excellent mechanical properties at a temperature below 700 °C, but above it, the mechanical properties of WC-Co decrease severely because of the oxidation effect. In the present study, the addition of metal silicide of CrSi₂ was considered to enhance the oxidation resistance of cementite carbide. The WC-12Co compacts containing 0, 12.5, and 25 wt% CrSi₂ were prepared using mechanical alloying and spark plasma sintering techniques at 1150 °C. According to the results of metallographic characterization, the sintered WC-12Co is composed mainly of WC and Co phases. The addition of CrSi₂ leads to the formation of new phases as CrSi, CoSi, Co₆W₆C, and SiC depending on the compact composition. It is found that the WC-12Co compact with 12.5 wt% CrSi₂ content exhibits a lower measured density and higher hardness compared to that of CrSi₂-free compact. After the first cycle of exposure at 900 °C, the WC-12Co is severely oxidized, forming porous and crack oxide scales. On the contrary, the addition of 12.5 wt% CrSi₂ shows the lowest mass gain and displays the most resistance to oxidation attributed to the formation of mainly SiO₂ scales. Further increase in CrSi₂ concentration, however, the alloy compact experiences breakaway oxidation after the fifth cycle of exposure. Accordingly, it can be proposed that the addition of 12.5 wt% CrSi₂ is the most promising composition to allow the cemented carbide used at high temperatures and oxidizing atmospheres.

WC-Co在低于700°C的温度下具有出色的机械性能，但高于此温度时，由于氧化作用，WC-Co的机械性能急剧下降。在本研究中，考虑添加CrSi ₂的金属硅化物以增强渗碳体的抗氧化性。使用机械合金化和火花等离子体烧结技术在1150°C下制备了WC-12Co压块，其中CrSi ₂含量为0、12.5和25％。根据金相表征结果，WC-12Co烧结体主要由WC相和Co相组成。CrSi _2的添加导致形成新相，如CrSi，CoSi，Co ₆ W ₆C和SiC取决于致密成分。据发现，WC-12CO紧凑用12.5％（重量）的CrSi _2所含量表现出较低的测得的密度和更高的硬度相比的CrSi的₂ -free紧凑。在900°C下的第一个暴露周期后，WC-12Co被严重氧化，形成多孔和裂纹的氧化皮。相反，添加12.5重量％的CrSi ₂表现出最低的质量增加，并且由于主要形成SiO ₂氧化皮而显示出最大的抗氧化性。CrSi ₂浓度进一步增加，但是，在第五次暴露循环后，合金压块经历了断裂氧化。因此，可以建议添加12.5重量％的CrSi _2。 是允许在高温和氧化气氛下使用硬质合金的最有前途的成分。