(1. 蘭州理工大學(xué) 材料科學(xué)與工程學(xué)院 省部共建有色金屬先進(jìn)加工與再利用國家重點(diǎn)實(shí)驗(yàn)室, 蘭州 730050 2. 中國科學(xué)院 蘭州化學(xué)物理研究所 固體潤滑國家重點(diǎn)實(shí)驗(yàn)室，蘭州 730000)
摘 要: 利用粉末冶金的方法制備不同Mo含量的鎳基合金。考察其室溫至1000 ℃的力學(xué)性能及室溫至900 ℃下的摩擦磨損性能，分析磨損表面形貌，闡明Mo含量對Ni基合金力學(xué)和摩擦學(xué)性能的影響及其機(jī)理，優(yōu)化Mo元素的含量。結(jié)果表明：Mo含量(質(zhì)量分?jǐn)?shù))為5%時(shí)可以改善鎳基合金的拉伸、壓縮等力學(xué)性能和摩擦學(xué)性能；XRD、SEM及 Raman分析表明在500 ℃以上時(shí)，磨痕表面形成由NiO、NiMoO4等組成的摩擦層，有效地改善了Ni基合金在高溫下的摩擦學(xué)性能。
關(guān)鍵字: 粉末冶金；鎳基合金；鉬；摩擦磨損
（1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China）
Abstract:Ni-based alloys with different Mo contents were prepared by the powder metallurgy. The mechanical properties from RT to 1000 ℃ and the tribological properties from RT to 900 ℃ were investigated, and the wear surfaces morphologies were analyzed. The effect of Mo content on the mechanical and tribological properties and the mechanism were elucidated. The results show that the mechanical properties and tribological properties of Ni-based alloy can be improved when the molybdenum content is 5%. The worn surfaces examined by XRD, SEM and Raman indicate that the tribo-layers consist of NiO and NiMoO4 at temperature above 500 ℃, which is responsible for the reduced friction coefficient and wear rate of Ni-based alloy at high temperatures.
Key words: powder metallurgy; Ni-based alloy; Mo; friction and wear
