摘要： 为提高无机磷酸铝涂层的高温耐磨性，降低高温下的摩擦系数，制备了氧化铝包覆多壁碳纳米管（ MWCNTs）杂化型填料，将其加入到无机磷酸铝涂料中，采用 X射线衍射分析仪（ XRD）、傅立叶变换红外光谱仪（ FT-IR）、拉曼光谱仪（ Raman）、热重分析仪（ TG）和扫描电子显微镜（ SEM）等表征了填料结构，并研究了填料含量对复合涂层的力学性能和耐磨性能的影响规律。结果表明：纳米 α-Al₂O₃成功接枝于多壁碳纳米管（ MWCNTs）表面。经表面改性后的 MWCNTs的氧化分解温度提升近 100 ℃，杂化材料在涂层中的分散程度更佳。随着 Al₂O₃-MWCNTs用量的增加，涂层硬度、附着力呈现先增加后降低的趋势，当 Al₂O₃-MWCNTs用量为 0. 4%时，涂层力学性能最优，硬度提升至近 2倍，附着力提升至近 2. 6倍。 600 ℃高温摩擦磨损耦合试验结果表明，添加 0. 4%的 Al₂O₃-MWCNTs涂层的摩擦系数最低为 0. 659，磨损率最小为 2. 73×10^-4 mm³/（ N·m），说明添加 Al₂O₃-MWCNTs杂化填料确可有助于提高无机磷酸盐涂层的摩擦学性能。

关键词: 无机磷酸盐涂层；高温摩擦学性能；纳米复合涂料；碳纳米管；微观结构

Abstract: To improve tribological performance of inorganic aluminum phosphate composite coating at high temperature，the hybrid materials of multi-walled carbon nanotubescovered by aluminum oxide was prepared and added to above coatings. The properties andstructure of the hybrid materials were determined by X-ray diffraction analysis（XRD），Fourier transform infrared spectroscopy（FT-IR），Raman spectroscopy，thermogravimetry analysis（TG）， and scanning electron microscopy（SEM）. And the effect of filler content on mechanical properties and wear resistance of the composite coatings were studied. All the results showedthat nano-Al₂O₃ was successfully grafted on the surface of multi-walled carbon nanotubes（MWCNTs）. The surface-modified MWCNTs’ oxidation temperature could be increased by over 100 ℃，and was dispersed more easily. The hardness and bonding of the coatings showeda tendency of increasing and then dropping with the increasing Al₂O₃-MWCNTs content，when the Al₂O₃-MWCNTs was 0. 4% of the total coating component，the hardness could be increased to nearly twice as much，and its adhesion raised to nearly 2. 6 times. The results ofthe friction and wear coupling test at high temperature of 600 ℃ demonstrated that when thecontent of Al₂O₃-MWCNTs was 0. 4%，the friction coefficient of the coating reduced to 0. 659， and the wear rate reached the lowest value of 2. 73×10^-4 mm³/（ N·m）. Which indicated that the introduction of Al₂O₃-MWCNTs hybrid materials enhanced the tribological performance of inorganic phosphate.

Key words: inorganic phosphate coating；high-temperature tribological properties； nanocomposites；carbon nanotubs；microstructure

中图分类号: 

• TQ637. 2