水溶性纳米CaCO3的制备及其摩擦学性能

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以CaCl2和Na2CO3为原料,采用沉淀法制备了纳米CaCO3,在制备过程中加入聚乙二醇表面修饰剂和聚丙烯酸钠分散剂,使纳米CaCO3稳定地分散于水中。采用透射电子显微镜（TEM）、X射线衍射仪（XRD）和傅里叶变换红外光谱仪（FT-IR）表征水溶性纳米CaCO3;利用四球试验机考察了水溶性纳米CaCO3及其同辛丁基二硫代磷酸双β-羟乙基十八胺盐（简称DDPN）组成的2种水基润滑液的摩擦性能,探讨了纳米CaCO3同DDPN的协同作用,并通过扫描电子显微镜（SEM）和俄歇电子能谱仪（AES）分析了钢球磨斑表面。结果表明,纳米CaCO3的粒径在20～30nm范围,无明显团聚现象;水溶性纳米CaCO3具有良好的摩擦学性能,与DDPN复合使用时具有较好的抗磨减摩协同作用,比单独使用水溶性纳米CaCO3或DDPN的抗磨减摩性能均有所提高;当纳米CaCO3质量分数为0.15、DDPN质量分数为5.0时,复合水基润滑液的摩擦学性能达到最佳,最大无卡咬负荷（PB）为1029N,钢球磨斑直径（WSD）为0.61mm。 CaCO3 nano-particles were prepared by a precipitation method with polyethylene glycol as surface modifier and poly（sodium acrylate） as dispersant to make the nano-particles steadily dispersed in aqueous solution.Morphology and structure of CaCO3 nano-particles were investigated by XRD,TEM and FT-IR.The tribological properties of two water-based lubricants composed of water-soluble CaCO3 nano-particles and DDPN were investigated by a four-ball machine.Wear scars on the steel ball surfaces were studied by SEM and AES.Results showed that the size of CaCO3 nano-particles,without obvious aggregation appearance,was in the range of 20-30 nm,and the water-soluble CaCO3 nano-particles possessed high tribological performance and good synergy with DDPN in anti-wear and friction reduction.The tribological performance of the compound of CaCO3 nano-particles and DDPN was higher than that of only the nano-particles or DDPN.The water-based lubricating fluid containing CaCO3 nano-particles of 0.15%（mass fraction） and DDPN of 5.0%（mass fraction） had the highest tribological properties with the PB value of 1029 N and WSD of 0.61 mm.