Abstract
Ti doped DLC coating was deposited on ductile iron disk commonly used material in small Wankel rotary engine. The friction coefficient under the working condition of apex seal was investigated. The results show that the Ti doped DLC coating is of low friction coefficient. In addition, the surface hardness and the morphology were improved by Ti doped DLC coating. After that, the Ti doped DLC coating was deposited on the housing. A performance testing platform for small Wankel rotary engine was built. The effect of Ti doped DLC coating under motored and working conditions were measured. The results show that when the operation speed varies from 7 000 to 17 000 r/min, the friction loss between apex seal and Ti doped DLC coating ranges 15~38 W under motored condition. It is only 68% of the friction loss between apex seal and ductile iron. Under working condition, the coating increases 23~78 W of the engine output power, which can improve the output power of small Wankel rotary engine by 24%~43%.
Highlights
Ti doped DLC coating was deposited on ductile iron disk commonly used material in small Wankel rotary engine
The results show that the Ti doped DLC coating is of low friction coefficient
The surface hardness and the morphology were im⁃ proved by Ti doped DLC coating
Summary
收稿日期:2018⁃10⁃09 作者简介:张帅(1988—) ,北京理工大学博士研究生,主要从事微小型转子发动机摩擦磨损研究。 通信作者:刘金祥(1975—) ,北京理工大学副教授,主要从事发动机结构疲劳研究。 e⁃mail: liujx@ bit.edu.cn. 第 37 卷 φ52 mm×6.7 mm。 沉积前,球墨铸铁经过铸造、淬 火、回火、调质和研磨处理,其工艺流程与小型转子 发动机气缸的工艺流程一致。 镀膜采用过滤阴极真 空电弧技术镀膜沉积系统制备,镀膜工艺参数如表 1 所示,镀膜前后试件如图 1 所示。. 由图 2 可知,本研究制得 Ti 掺杂 DLC 膜具有良 好的一致性。 依据加载位移曲线得出 Ti 掺杂 DLC 膜硬度的平均值为 10.7 GPa,弹性模量的平均值为 210 GPa。 利用相同方法测量了基体材料球墨铸铁 的硬度和弹性模量,其硬度的平均值为 3.5 GPa,弹 性模 量的平均值为 180 GPa。 由 此 可 知, Ti 掺 杂 DLC 膜增大了镀膜区域表面的硬度和弹性模量,这 会减少摩擦副接触引起的变形量,进而减少相互作 用的接触面积和降低摩擦力。
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