氨基黏土制备及其作为水基润滑添加剂的摩擦学性能研究

以MgCl_2和硅烷偶联剂KH550为原料,在乙醇溶液中制备了水溶性氨基黏土;采用X射线衍射仪、傅立叶变换红外光谱仪等分析了产物的组成和结构;采用四球摩擦磨损试验机考察了所制备的氨基黏土作为水基润滑添加剂的摩擦学行为,采用扫描电镜观察了钢球磨损表面形貌,采用能谱仪测定了磨损表面元素组成.结果表明:所制备的氨基黏土在水中的分散性良好;其作为水基润滑添加剂可在钢球摩擦副接触表面形成由Mg、Si、O和Fe等元素组成的润滑修复膜,从而表现出良好的减摩抗磨性能,并在一定程度上抑制水对钢的腐蚀作用.

Preparation of Amino clay and Evaluation of Its Tribological Properties as a Water-based Lubricant Additive

Amino clay(hydroxyl magnesium silicate) powder with layered structure was prepared in alcohol solution taking MgCl₂ and silane coupling agent KH550 as the starting materials. The composition and microstructure of asprepared amino clay were analyzed by X-ray diffraction and Fourier transform infrared spectrometry. The tribological properties of as-prepared water-soluble amino clay as a water-based lubricant additive were evaluated with a four-ball friction and wear tester, and the morphology and elemental composition of the worn steel surfaces were analyzed by scanning electron microscopy and energy dispersive spectrometry. Results indicate that the amino-functionalized amino clay exhibited good dispersibility in water. In the meantime, as a water-based lubricant additive, as-prepared watersoluble amino clay was capable of forming a lubricating and repairing film composed of Mg, Si, O and Fe on worn steel surfaces, thereby effectively mitigating the wear of the steel-steel pair and inhibiting the corrosiveness of water to the steel frictional pair to some extent.