【作者】 向东湖；

【导师】 唐群国；

【作者基本信息】 华中科技大学 ， 机械电子工程， 2005， 硕士

【摘要】 纯水液压传动采用海水或者淡水作为工作介质,具有不燃、无污染等优点,在某些发达国家已经在食品、医药、海洋开发、水下作业工具等方面获得广泛应用。相对矿物油而言,纯水的腐蚀性强、润滑性差,水压元件摩擦副材料除了要求足够的机械性能外还必须具有高的耐腐蚀、耐磨性和低的摩擦系数。因此,寻找水环境下摩擦学性能好的摩擦副配对材料是研制纯水液压元件的关键。本文提出了采用工程塑料与不锈钢或工程塑料与等离子喷涂工程陶瓷配对应用于纯水液压元件摩擦副,在MMU-10F 端面摩擦磨损实验机上对载荷、速度、时间等因素对材料摩擦系数的影响进行了大量试验,同时,对不同材料配对时的磨损量进行了比较。为了准确、自动记录摩擦系数的动态过程,本文利用Visual C++开发了MMU-10F摩擦磨损试验机的计算机辅助测试系统,该系统主要以传感器、AT89C51 单片机和计算机组成。水润滑条件下,超高分子量聚乙烯和聚四氟乙烯填料聚苯酯以及聚醚醚酮与不锈钢和陶瓷涂层配对时具有较小的摩擦系数,但是超高分子量聚乙烯和聚四氟乙烯填料聚苯酯具有较大的磨损量。PEEK、MC 铸型尼龙和酚醛树脂合金有较小的磨损量。PEEK和酚醛树脂合金有比较好的综合摩擦学特性。几种等离子喷涂陶瓷涂层中,与工程塑料配对时摩擦系数比较接近,其中氧化铝对塑料涂抹转移稍大,Cr₂O₃·5SiO₂·3TiO₂、纳米ZrO₂陶瓷涂层具有较好的摩擦磨损特性。工程塑料与不锈钢的磨损机理以微观切削为主,与陶瓷涂层的磨损以塑性转移为主。更多还原

【Abstract】 Water hydraulics, which uses tap water or seawater as working medium, has the advantages of cleanness, fire resistance and no pollution. Water hydraulic systems or equipments have been widely used in food factory, medical equipments or in special situations like ocean exploitation, under water operating system, etc. Besides enough mechanical strength, their materials must have high resistance to corrosion and wear, low frictional coefficient, because of the specific physical and chemical characteristics of water, which has high corrosion and low lubricating ability in contrast with mineral oil as working medium. So it becomes the most important problem to search for some special materials and special material combinations as friction pairs in water hydraulic components. This paper puts forward that the engineering plastic versus stainless steel or plasma sprayed ceramic can be adopted for the key friction pairs of water hydraulic components. Experiments are performed to study the friction characteristic and wear mechanism of materials. To get the friction coefficient automatically and dynamically, this paper introduces the implementation of test system composed of sensors, AT89c51 single-chip microcomputer and computer for the type MMU-10F friction and wear tester. Among the tested engineering plastic, the friction coefficients of UHMW-PE, POB and PEEK are smaller whether the mated plate was stainless steel or plasma sprayed surface, next come MC and F102 thermosetting phenolic aldehyde resin. However, the wear volume of UHMWPE and POB filled with PTFE are higher. Among several plasma sprayed ceramic, the frictions are almost close but the AL₂O₃ has more transfer to engineering plastic. Cr₂O₃·5SiO₂·3 TiO₂、ZrO₂·MgO and nano-ZrO₂ have much better tribological characteristics. The main wear mechanism for engineering plastic with stainless steel surface is mechanical cutting and with sprayed ceramic surface is primarily plastic transfer.更多还原