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经共沉淀法和水热法合成了锌镁铝三元类水滑石(Zn/Mg/Al-LDHs)纳米粉体,并用油酸进行表面改性。采用X射线衍射,扫描电子显微镜(SEM),红外光谱和X射线荧光光谱等测试对Zn/Mg/Al-LDHs纳米粉体进行了表征。采用四球摩擦试验机,SEM和X射线光电子能谱(XPS)等手段对类水滑石的摩擦性能以及磨损钢球表面进行了分析。结果表明:类水滑石具有典型的六方片层结构,晶粒尺寸均匀,平均粒径为179.4nm;化学式为Zn0.37Mg0.27Al0.36(OH)2(CO3)0.18·0.31H2O;改性后,油酸在类水滑石表面呈单分子层吸附;类水滑石在高载荷(200~400N)和适当的转速下可显著降低金属摩擦副的摩擦系数和磨斑直径。XPS结果显示,磨损表面生成了含有ZnO,ZnS,MgO,氧化铁等化合物和有机物的化学反应保护膜,同时,纳米颗粒抛光和第三体效应也起到了减磨抗磨作用。
Zinc-magnesium-aluminum ternary hydrotalcite (Zn / Mg / Al-LDHs) nano-powders were synthesized by coprecipitation and hydrothermal method and were surface modified with oleic acid. The Zn / Mg / Al-LDHs nanopowders were characterized by X-ray diffraction, scanning electron microscopy (SEM), infrared spectroscopy and X-ray fluorescence spectroscopy. Four-ball friction tester, SEM and X-ray photoelectron spectroscopy (XPS) were used to analyze the tribological properties of the hydrotalcite and the surface of the worn steel ball. The results show that the hydrotalcite-like hydrotalcite has a typical hexagonal lamellar structure with uniform grain size and an average particle size of 179.4 nm. The chemical formula is Zn0.37Mg0.27Al0.36 (OH) 2 (CO3) 0.18 · 0.31H2O. After modification , And oleic acid adsorbed on the surface of hydrotalcite monolayer. Hydrotalcite-like hydrotalcite can significantly reduce the friction coefficient and the spot diameter of the metal friction pair under high load (200-400 N) and proper rotation speed. The results of XPS showed that the chemical reaction protective film containing ZnO, ZnS, MgO, iron oxide and other compounds and organic compounds was formed on the worn surface. At the same time, the nano-particle polishing and the third body effect also reduced the wear and abrasion resistance.