(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室, 長(zhǎng)沙 410083)
摘 要: 研究了Ni-Cr-Mo-S合金的自潤(rùn)滑機(jī)理。 結(jié)果表明： 合金的顯微組織主要是由金屬基體和硫化物相與 Ni(Cr)合金形成的共晶體兩部分構(gòu)成。 隨著溫度的升高, Ni-Cr-Mo-S合金的摩擦因數(shù)逐漸降低；合金材料中生成的共晶體在摩擦面的溫度作用下可以變軟或熔化形成具有轉(zhuǎn)移性的自潤(rùn)滑膜。在實(shí)驗(yàn)的高溫下, MoO3和NiO也參與了潤(rùn)滑作用： 隨著溫度的上升, MoO3所起的固體潤(rùn)滑作用逐漸減小, NiO所起的固體潤(rùn)滑作用逐漸增大。在室溫摩擦?xí)r, 輕微粘著磨損為主要磨損形式；在高溫摩擦?xí)r, 磨粒磨損為主要磨損形式, 同時(shí)也會(huì)出現(xiàn)氧化磨損。
關(guān)鍵字: 鎳基合金； 高溫自潤(rùn)滑； 固體潤(rùn)滑
（State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract:The self-lubricating mechanism of a Ni-Cr-Mo-S alloy was studied. The results show that the microstructure of materials is made up of metallic matrix and sulfide eutectics or their combinations. The eutectics can be softened or melted to form self-lubrication transferring film under the effects of temperature on the wear surfaces. MoO3 and NiO will join in the lubrication process at experimental high- temperature.With increasing temperature, the lubrication effect of MoO3 decreases while that of NiO increases. The dominant wear type is slight slip-sticking abrasivion at room temperature and particle abrasivion mixed with oxidation wear during high-temperature friction process.
Key words: nickel base alloy, high-temperature self-lubrication, solid lubrication
