摘要
为了提升机械传动轴的表面耐磨性和耐蚀性,采用双辉等离子表面冶金技术在基体表面制备了SiC/Ta复合涂层,研究了反应气体(氢气H2/四甲基硅烷TMS)流量对复合涂层显微形貌、截面形貌、物相组成、耐磨和耐腐蚀性能的影响。结果表明:随着反应气体中TMS流量的增加,表面复合涂层逐渐从致密花纹状演变为颗粒+凹坑+显微孔洞形态,反应气体流量为10/1.0时,SiC涂层和Ta过渡层都较为致密,且界面处未见孔洞或者裂纹等缺陷;不同反应气体流量下制备的复合涂层都有助于减小摩擦系数,在反应气体流量为10/1.0时,涂层摩擦系数最小且较为稳定。不同反应气体流量的表面涂层的磨损都小于4Cr13基体,且随着反应气体中TMS流量增加,涂层的磨痕宽度、磨痕深度、磨损体积和比磨损率先减小后增大,当反应气体流量为10/1.0时,取得最小值;不同反应气体流量的传动轴表面涂层的腐蚀电位都相对基体发生正向移动、腐蚀电流密度减小,在反应气体流量为10/1.0时,取得腐蚀电位最正、腐蚀电流密度最小值,此时复合涂层具有最佳的耐磨性能和耐腐蚀性能。
In order to improve the surface wear resistance and corrosion resistance of mechanical trans-mission shaft,SiC/Ta composite coating was prepared on the substrate surface by double glow plasma surface metallurgy technology.The effects of reaction gas flow on the microstructure,section morpholo-gy,phase composition,wear resistance and corrosion resistance of the composite coating were studied.The results show that with the increase of tetramethylsilane(TMS)flow rate in the reaction gas,the surface composite coating gradually evolves from dense pattern to particle,pit and micro hole.When the reaction gas flow rate is 10/1.0,the SiC coating and Ta transition layer are relatively dense,and there are no defects such as holes or cracks at the interface;The composite coatings prepared under dif-ferent reaction gas flow rates help to reduce the friction coefficient,and when the reaction gas flow rate is 10/1.0,the friction coefficient of the coating is the smallest and more stable.The wear degree of sur-face coatings with different reaction gas flow rates are less than 4Cr13 matrix.With the increase of TMS flow rate in reaction gas,the wear scar width,wear scar depth,wear volume and specific wear of coat-ings first decrease and then increase,and when the reaction gas flow rate is 10/1.0,the minimum val-ue is obtained.The corrosion potential of the coating with different reaction gas flow moves forward rel-ative to the substrate,and the corrosion current density decreases;When the reaction gas flow rate is 10/1.0,the most positive corrosion potential and the minimum corrosion current density are obtained.At this time,the composite coating has the best wear resistance and corrosion resistance.
作者
杨林
李文兵
赵雪飞
YANG Lin;LI Wenbing;ZHAO Xuefei(Sichuan Aerospace Vocational College,Chengdu 610100,China;College of Materials,and Chemistry&Chemical Engineering,Chengdu University of Technology,Chengdu 610059,China)
出处
《电镀与精饰》
CAS
北大核心
2022年第12期32-39,共8页
Plating & Finishing
基金
四川省科技计划重点研发项目(2021YFG0077)
青年科学基金项目(51605178)。
关键词
机械传动轴
复合涂层
表面改性
耐磨性能
耐腐蚀性能
mechanical transmission shaft
composite coating
surface modification
wear resistance
corrosion resistance
