指尖密封用炭-炭复合材料摩擦磨损性能

发布时间：2018-02-19 23:09

本文关键词： 炭-炭(炭纤维增强炭基体)复合材料摩擦磨损载荷频率指尖密封　出处：《哈尔滨工业大学学报》2017年01期 　论文类型：期刊论文

【摘要】：为确定指尖密封用炭-炭(炭纤维增强炭基体)复合材料的摩擦学性能,针对指尖密封的轻载使用条件,应用UMT-2摩擦磨损测试仪进行炭-炭复合材料摩擦磨损性能试验,测量摩擦系数与磨损率,并采用扫描电子显微镜(SEM)分析材料的摩擦磨损机理.结果表明,无纬布层垂直于摩擦平面时,材料的摩擦系数和磨损率较低.载荷增加,较高密度材料的磨损率增加缓慢,摩擦系数减小.与载荷相比,材料磨损率受频率的影响较小,且随频率升高摩擦磨损性能越好.磨损表面的SEM分析表明:低频、低载条件下材料发生磨粒磨损;频率的提高加快磨屑膜的成形,自润滑能力增强;载荷的增加虽使磨屑快速被挤压形成磨屑膜,但磨屑膜被不断挤出剥落,纤维裸露断裂产生严重磨损,这一点在材料密度较低时表现更为显著.选用较高密度的材料以及布置无纬布层垂直于摩擦平面可以有效缓解密封材料的磨损.
[Abstract]:In order to determine the tribological properties of carbon / carbon (carbon fiber reinforced carbon matrix) composites for fingertip sealing, the friction and wear properties of carbon / carbon composites were tested by UMT-2 friction and wear tester. The friction coefficient and wear rate were measured, and the friction and wear mechanism of the material was analyzed by scanning electron microscope (SEM). The results showed that the friction coefficient and wear rate of the material were lower and the load increased when the weft free layer was perpendicular to the friction plane. The wear rate of the high density material increases slowly and the friction coefficient decreases. Compared with the load, the wear rate of the material is less affected by the frequency, and the better the friction and wear performance is with the increase of the frequency. The SEM analysis of the wear surface shows that the wear rate is lower than that of the load. Under low load condition, abrasive wear occurs; the increase of frequency accelerates the forming of debris film, and the self-lubricating ability is enhanced; although the increase of load causes the debris to be extruded rapidly to form the debris film, the debris film is continuously extruded and flaked. When the material density is low, the material with high density and perpendicular to the friction plane without weft cloth layer can effectively alleviate the wear of the sealing material.
【作者单位】：西北工业大学机电学院;中南大学粉末冶金国家重点实验室;
【基金】：国家自然科学基金面上项目(51575445) 陕西省自然科学研究计划项目(2014JM7266)
【分类号】：TB332

【相似文献】