Evaluation of Friction Characteristics and Low Friction Mechanism of Tungsten Disulfide for Space Solid Lubricant at Elevated Temperature in a Vacuum
Evaluation of Friction Characteristics and Low Friction Mechanism of Tungsten Disulfide for Space Solid Lubricant at Elevated Temperature in a Vacuum
复制标题
真空高温空间固体润滑剂二硫化钨摩擦特性及低摩擦机理评价
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
K. Hashimoto
中科院分区：
文献类型：
--
作者：
Ayaka Takahashi;J. Tetuko;K. Hashimoto
计划开发一种用于探测另一颗行星的合成孔径雷达。合成孔径雷达卫星需要一个大型天线部署系统，用于通信和观测行星。航天器将被要求在执行任务期间无需维护即可承受恶劣环境。一种选择是在滑动部分使用固体润滑剂。研究了在太空高温下用作固体润滑剂的二硫化钨(WS2)。为了模拟展开过程中的摩擦，在金属圆盘上用三种不同类型的WS2涂层测量了室温摩擦系数和真空中高温摩擦系数。在相同的镀膜条件下，使用相同的镀膜设备，将第一层WS2结合膜与二硫化钼(MoS2)结合膜进行比较。MoS2主要用于目前的航天器，它与WS2具有相似的晶体结构。在500℃真空条件下，WS2结合膜的磨损寿命比MoS2结合膜的磨损寿命长。还检测了溅射膜和喷丸强化膜。WS2喷丸强化膜在室温和高温下的摩擦系数都很低。此外，还从摩擦试验后的分析结果中确认了低摩擦的机理。这些材料的摩擦机制归因于(0002)晶面的弱结合。结果表明，在(0002)晶面织构较强的样品具有较低的摩擦系数。
A development for a synthetic aperture radar for exploration of another planet is planned. A synthetic aperture radar satellite needs a deployment system for a large antenna for both telecommunication and observation of the planet. The spacecraft will be required to withstand harsh environments without maintenance during the mission. One option is to use a solid lubricant in the sliding portions. Tungsten disulfide (WS2) for use as a solid lubricant at elevated temperatures in space has been examined. In order to simulate the friction during deployment, measurements for the friction coefficient at room temperature and high temperature in a vacuum using three types of WS2 coating films on a metal disk have been conducted. The first WS2 bonded film was compared to molybdenum disulfide (MoS2) bonded film with the same coating condition and using the same equipment. MoS2 has been mainly utilized in current spacecraft and it has similar crystal structure as that of WS2. The wear life of WS2 bonded film shows longer life than MoS2 bonded film at 500°C under vacuum. Sputtered films and shot peening films were also examined. The friction coefficient of WS2 shot peening films are extremely low at room temperature and high temperatures. Furthermore, an effort was made to confirm the low friction mechanism from the result of analysis after the friction tests. The friction mechanism of these materials is attributed to weakly bonding of the (0002) plane. It was shown that a specimen having strong texture on the (0002) plane has a low friction coefficient.