(钢铁研究总院 粉末冶金研究室，北京 100081)
摘 要: 采用粉末冶金工艺制备一种新型Cr3C2-Ni-Ti3SiC2减摩材料，并研究Ti3SiC2添加量对其与GCr15摩擦副在400 ℃大气环境下摩擦学行为的影响。结果表明：在高温摩擦场的作用下，复合材料中的Ti3SiC2能够 诱发形成具有良好减摩作用的摩擦氧化膜，不仅可以降低摩擦副的摩擦因数，避免摩擦因数的较大波动，而且能够显著降低摩擦系统的总磨损率，对摩擦偶件起到极好的保护作用。当Ti3SiC2含量(质量分数)分别为2.5%、5.0%、7.5%和10%时，复合材料的摩擦因数比未添加Ti3SiC2的Cr3C2-Ni金属陶瓷的摩擦因数分别下降5.3%、15.8%、26.3%和13.2%，摩擦副的总磨损率也下降了一个数量级；同时，摩擦偶件的磨损率也由3.5×10-5 mm3/(N？m)逐步下降到9.8×10-7 mm3/(N？m)。
关键字: Cr3C2-Ni；Ti3SiC2；摩擦学行为；高温减摩；摩擦氧化膜
（Powder Metallurgical Research Department, Central Iron and Steel Research Institute, Beijing 100081, China）
Abstract:The new anti-friction Cr3C2-Ni-Ti3SiC2 composites were fabricated by powder metallurgy process, and the influence of Ti3SiC2 content on tribology behaviors of Cr3C2-Ni matrix composites against GCr15 was studied at 400 ℃ in air. The results show that the new as-prepared composites with Ti3SiC2 are of favorable anti-friction properties because of the tribo-oxidation film formation induced by Ti3SiC2 during the friction. After adding Ti3SiC2, not only the coefficient of friction (COF) is obviously decreased and its fluctuation is flattened, but also the wear rate of the tribo-system is sharply decreased and the friction pair is effectively protected. When the Ti3SiC2 contents (mass fraction) of the composites are 2.5%, 5%, 7.5% and 10%, the COFs are respectively decreased by 5.3%, 15.8%, 26.3% and 13.2% compared with that of the Cr3C2-Ni cermet without Ti3SiC2. Meanwhile, the wear rate of the friction pair is downgraded by an order of magnitude and the wear rate of the friction partner is gradually decreased from 3.5×10-5 mm3/(N？m) to 9.8×10-7 mm3/(N？m).
Key words: Cr3C2-Ni; Ti3SiC2; tribology behavior; high temperature anti-friction; tribo-oxidation film
