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CePO4纳米微粒的摩擦学行为 总被引:7,自引:0,他引:7
稀土元素由于具有4f电子特性,使其元素及其化合物具有许多特殊的性能.因此,研究和开发稀土在润滑材料领域的应用,具有重要意义[1~6].本文采用吸附共沉淀表面修饰法制备了磷酸烷酯修饰的CePO4纳米微粒,并将其分散于基础润滑油中考察其摩擦学行为,试图利... 相似文献
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在醇-水体系中采用同阴离子共沉淀法合成了季铵盐修饰的(NH4)3PMo12O40纳米微粒,以TEM、 XRD、 FTIR、 TGA、 DSC等多种分析手段表征了这种纳米微粒的形貌和结构,在四球试验机上考察了它们的摩擦学性能.结果表明所合成的杂多化合物具有Keggin骨架结构,微粒粒径约20 nm,在有机溶剂中可良好分散,作为一类新型润滑油添加剂,具有良好的抗磨性能. 相似文献
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The solution dispersion method has been successfully used to prepare Pb nanoparticles in a paraffin oilpolyglycol mixed solution by directly dispersing melted Pb granules. In this solution system,paraffin oil was used as reacting media and polyglycol served as an antioxidant to protect Pb nanoparticles from oxidizing. The size and structure of the prepared Pb nanoparticles were characterized by means of the transmission electron microscopy (TEM)and powder X-ray diffraction(XRD). Their tribological behavior was evaluated with a four-ball tester. The TEM and XRD investigations reveal that the prepared Pb nanoparticles,with the average particle diameter of 70 nm,appear to be of close spherical shape and possess the same crystal structure as the bulk Pb. The tribological results show that the Pb nanoparticles as an oil additive exhibit good friction-reduction and antiwear properties at different additive concentration and applied load. Meanwhile,they can also strikingly improve the load-carrying capacity of the base oil. The rubbed surface was also investigated by the scanning electron microscope(SEM)and energy dispersive spectroscopy(EDS). However,there was not presence of Pb element on the worn surfaces,which indicated that no chemical reaction occurred between the Pb nanoparticles and the rubbing surfaces. In addition,the tribological mechanism of the formation of the sliding-bearing system was also proposed. 相似文献
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用超高压透射电子显微镜原位加热动态观察的方法研究从非晶氢氧化镧转变为纳米级氧化镧超细粉过程中显微组织和结构的变化。电子衍射花样证实在试样被加热到400℃以上时转变为氧化镧纳米粉,其颗粒尺寸为20 ̄50nm。 相似文献
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LaPO4纳米微粒的制备及表征 总被引:5,自引:0,他引:5
Surface-modified LaPO4 nanoparticales were synthesized in the mixture solvent of water-ethanol with the surface modification age of dialkylphosphate. The conditions of synthesis and characterization were discussed. The results indicated that nanoparticle core of LaPO4 and surface-modified layer were formed. The surface-modified nanoparticles of LaPO4 can be dispersed in organic solvent and has better lubricating properties. 相似文献
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通过本体氧化物在常压沸腾水中的水化处理制备了具有棒状外型的氢氧化镧。XRD衍射图显示在短时间内可以得到六方相氢氧化镧,表明其水化过程是相当快的。所得氢氧化镧几乎完全呈针状和棒状外型,其宽度为2-3μm,长为5-8μm。对棒状氢氧化镧的形成机制作了适当解释,并通过煅烧该氢氧化镧微米棒得到了类似外形的氧化镧。该方法比水热法更易于实现工业化应用。 相似文献
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合成了1-甲基-3-羟乙基咪唑四氟硼酸盐离子液体([C2OHmim]BF4),用红外光谱表征了其结构。以所合成的离子液体作为还原剂、稳定剂与反应介质制备了Ag纳米微粒,用XRD和TEM对微粒的结构和形貌进行了表征。在四球摩擦磨损实验机上研究了[C2OHmim]BF4离子液体及掺入Ag纳米微粒后的离子液体的摩擦学性能。掺入银纳米微粒后,离子液体在高载荷下的润滑性有了大幅的改善。用SEM和XPS分别对磨痕表面的形貌和元素组成、化学状态进行了分析,结果表明:在低、高载荷分别起润滑作用的是有机膜和金属-有机复合膜。 相似文献
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聚苯乙烯纳米微球的合成及摩擦学行为的研究 总被引:4,自引:0,他引:4
用乳液聚合法合成了聚苯乙烯纳米微球 ,并对其进行透射电镜 (TEM)、热重 (TGA)、及差热 (DSC)等性能表征。在四球实验机上研究了其摩擦学行为 ,结果表明 ,高分子纳米粒子有良好的减摩、抗磨性能。 相似文献
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三元体系La(NO3)3—Gly—H2O的研究 总被引:3,自引:1,他引:3
测定了三元体系La(NO3)3-GlyH2O在25℃时的溶度和饱和溶液的折光指数。报道了三元体系中生成的三元配合物:La(Gly)2(NO3)3.2H2O和La(Gly)4(NO3)3.H2O。用熔点、红外光谱及热分析测定了各配合物的一些物理化学性质。 相似文献
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