摘要
非晶合金纳米粒子具有许多特殊功能,但摩擦领域尚未见其应用报道。采用液相还原法制备了Ni-B非晶合金纳米微粒,利用四球摩擦磨损试验机考察了Ni-B非晶合金纳米微粒作为润滑脂添加剂的摩擦学行为,并用扫描电子显微镜(SEM)和能量散射谱(EDS)等对钢球摩擦表面进行了分析。结果表明:所制备的Ni-B非晶合金纳米微粒平均粒径约30 nm,表面被氧化;作为润滑油添加剂能够明显提高基础油的减摩抗磨能力,尤其当浓度为1.0%时,磨斑直径从0.54 mm降至0.38 mm。其抗磨减摩机理为:Ni-B非晶态合金纳米微粒在摩擦过程中沉积并发生摩擦化学反应,生成由氧化镍、氧化硼、铁氧化合物及有机吸附物组成的具有良好摩擦学性能的润滑防护膜,从而改善了基础脂的摩擦学性能。
Amorphous Ni-B alloy nanoparti-cles were prepared via chemical reduction of Ni( NO3)2 dissolved in ethanol by KB114 as the reducing agent under stirring. The nanoparticles were characterized by means of inductively coupled plasma-atomic emission spectrometry (1CP-AES) , X-ray diffrac-tion ( XRD) , transmittance electron microscopy (TEM) , and X-ray photoelectron spectroscopy ( XPS). The tribological proper-ties of the prepared Ni-B nanoparticles as an additive in lithium grease were evaluated using a four-ball friction and wear tester. The morphology and elemental composition of the wom surfaces of steel balls were analyzed by means of scanning electron microsco-py ( SEM) and energy dispersive spectrometry ( EDS). Results show that the average diameter of Ni-B nanoparticles was around 30 nm, but the surface was covered with a layer of NiO andB2O3, due to oxidation. Ni-B alloy nanoparticles were able to in-crease the friction reducing and anti-wear abilities of the base grease, in particular, when the dosage of Ni-B nanoparticles was fixed as 1.0%, the wear scar diameter of the steel balls was reduced from 0. 54 mm to 0. 38 mm. A boundary lubricating film mainly composed of Nit), B2O3 and FexOy was formed during the friction process, which contributed to effectively improving the friction reducing and antiwear ability of the grease.
出处
《材料保护》
CAS
CSCD
北大核心
2009年第5期4-6,共3页
Materials Protection
基金
国家自然科学基金资助重点项目(50721062)
国家973计划资助项目(2007CB607606)
