纳米坡缕石改进水润滑轴承性能的研究

Study on Nano-palygorskite Improving upon Performance of Water-lubricated Bearing

水润滑轴承的摩擦性能取决于橡胶轴瓦的润滑状态、硬度、动态粘弹性等.选取坡缕石(AT)纳米粉体,经硅烷偶联剂KH-550表面改性处理后,加入NBR制成AT/NBR橡胶轴瓦硫化胶试件与AT/NBR水润滑轴承试件.检测表明,AT/NBR橡胶轴瓦硫化胶试件的综合力学性能、硬度提高.动态力学分析仪DMA测得,NBR,AT/NBR橡胶轴瓦硫化胶试件0℃时的损耗因子大约相等,表明两者的湿滑能力基本不变.通过轴承摩擦磨损试验机,测出AT/NBR轴承试件的水润滑摩擦噪声、摩擦系数与磨损量降低.以上实验表明,AT/NBR轴承试件比NBR轴承试件的摩擦磨损等性能指标有所提高,并达到了美军标(船舶)MIL-DTL-17901C(SH)的规定.

The friction performance of water-lubricated bearing depends on the lubricated conditions, hardness, dynamic viscoelasticity of rubber, and so forth. After the surface was modified with silane coupling agent KH-550, palygorskite （AT） nano-powder was added to NBR rubber to prepare AT/NBR rubber-liner vulcanizate sample and AT/NBR water-lubricated bearing sample. Proved by testing results, the comprehensive mechanical properties and the hardness of AT/NBR rubber-liner vulcanizate sample were enhanced. Detected by dynamic mechanical analyzer （DMA）, the loss factor values at 0℃ of NBR and AT/NBR rubber-liner vulcanizate samples were approximately the same, and the wet sliding properties almost remained unchanged. When tested with friction wear-test machine of bearing, the water-lubricated friction coefficient of AT/NBR bearing sample decreased. Those experiments have shown that the performance index of AT/NBR bearing sample is better than that of the NBR bearing sample and meets the requirements of MIL-DTL-17901C （SH） specification.