SiCp/A356材料MAO膜与合成材料摩擦副的摩擦稳定性研究  

Study on Friction Stability of Friction Pair Consisting of SiCp/A356 MAO Coating and Synthetic Material

作　　者：杨智勇[1] 臧家俊 韩超 李卫京[1] 李志强[1] YANG Zhiyong;ZANG Jiajun;HAN Chao;LI Weijing;LI Zhiqiang(School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China;Locomotive&Car Research Institute,China Academic of Railway Sciences,Beijing 100081,China)

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044 [2]中国铁道科学研究院机车车辆研究所,北京100081

出　　处：《材料导报》2022年第9期45-52,共8页Materials Reports

基　　金：中央高校基本科研业务费专项(重点项目)(2020JBZ113)。

摘　　要：研究SiCp/A356材料微弧氧化(MAO)膜与合成材料摩擦副在制动温升和干湿摩擦条件下的膜层稳定性及摩擦特性,为解决SiCp/A356材料制动盘表面划伤问题及提高SiCp/A356材料制动盘与合成材料闸片在潮湿工况下的制动可靠性提供技术支撑和理论依据。通过SiCp/A356材料MAO膜的热震试验,研究了膜厚对膜层稳定性的影响,采用盘环摩擦试验,研究了SiCp/A356材料MAO膜与合成材料摩擦副在干燥和潮湿工况下的摩擦稳定性及磨损机理。随着MAO膜厚度的增加,膜层热震性能变差,升高热震温度会缩短膜层寿命,40μm厚的MAO膜在正常制动服役温升下具有良好的热震性能。在干燥工况下,MAO膜提高了SiCp/A356材料与合成材料摩擦副间的摩擦稳定性,MAO膜与合成材料的摩擦最终演变成第三体与合成材料的摩擦,并伴有第三体的粘着磨损与轻微磨粒磨损。在潮湿工况下,MAO膜可显著提高SiCp/A356材料与合成材料摩擦副间的摩擦系数(>0.3)和摩擦稳定性,MAO膜与合成材料间主要发生两体摩擦,合成材料磨损以磨粒磨损为主,MAO膜可有效保护SiCp/A356材料基体。MAO膜用于SiCp/A356材料与合成材料摩擦副具有较好的膜层稳定性并能改善摩擦副在潮湿工况下的摩擦性能。The coating stability and friction characteristics of friction pair consisting of SiCp/A356 micro-arc oxidation(MAO)coating and synthetic mate-rial under braking temperature and wet and dry friction conditions were studied,providing technical support and theoretical basis for solving the problem of scratches on the surface of SiCp/A356 material brake discs and improving braking reliability of the SiCp/A356 material brake discs and synthetic brake pads under wet conditions.In this paper,the influence of coating thickness on the stability of the MAO coating was studied through thermal shock test,while friction stability and friction mechanism of friction pair consisting of SiCp/A356 MAO coating and synthetic material were studied through disc-ring friction tests under dry and wet working conditions,respectively.With the increase of MAO coating thickness,the thermal shock performance of the MAO coating became worse,and the increase of thermal shock temperature reduced the life of the MAO coating.The MAO coating with 40μm thickness had a good thermal shock performance under normal braking service temperature.The MAO coating improved the friction stability between SiCp/A356 material and synthetic material under dry conditions,and the friction mechanism in the friction pair was essentially the friction behavior between third body layer and synthetic material,accompanied by the adhesive wear of third body layer and slight abrasive wear.In wet conditions,MAO coating significantly improved the friction coefficient(>0.3)and maintain the friction stability between SiCp/A356 material and synthetic material,and two-body abrasive wear behavior occurred;the synthetic material was severely worn while MAO coating effectively protected the SiCp/A356 material.MAO coating used in friction pair consisting of SiCp/A356 material and synthetic material has a good coating stability and it can improve the material friction performance under wet conditions.

关 键 词：SiCp/A356材料 MAO膜 热震 摩擦稳定性 磨损机理 

分 类 号：TB331[一般工业技术—材料科学与工程] TG174.4[金属学及工艺—金属表面处理]