(鋼鐵研究總院 粉末冶金研究室，北京 100081)
摘 要: 采用粉末冶金工藝制備一種新型Cr3C2-Ni-Ti3SiC2減摩材料，并研究Ti3SiC2添加量對其與GCr15摩擦副在400 ℃大氣環(huán)境下摩擦學(xué)行為的影響。結(jié)果表明：在高溫摩擦場的作用下，復(fù)合材料中的Ti3SiC2能夠 誘發(fā)形成具有良好減摩作用的摩擦氧化膜，不僅可以降低摩擦副的摩擦因數(shù)，避免摩擦因數(shù)的較大波動，而且能夠顯著降低摩擦系統(tǒng)的總磨損率，對摩擦偶件起到極好的保護(hù)作用。當(dāng)Ti3SiC2含量(質(zhì)量分?jǐn)?shù))分別為2.5%、5.0%、7.5%和10%時，復(fù)合材料的摩擦因數(shù)比未添加Ti3SiC2的Cr3C2-Ni金屬陶瓷的摩擦因數(shù)分別下降5.3%、15.8%、26.3%和13.2%，摩擦副的總磨損率也下降了一個數(shù)量級；同時，摩擦偶件的磨損率也由3.5×10-5 mm3/(N？m)逐步下降到9.8×10-7 mm3/(N？m)。
關(guān)鍵字: Cr3C2-Ni；Ti3SiC2；摩擦學(xué)行為；高溫減摩；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
