论文部分内容阅读
利用大气等离子喷涂技术,在不锈钢基体上用不同颗粒尺寸的纳米粉末制备了两种纳米氧化锆涂层S1(平均粒度较小颗粒的喷雾造粒粉末所得)和B1(平均粒度较大颗粒的喷雾造粒粉末所得)。运用XRD、SEM、TEM、拉曼光谱和金相技术等分析手段对喷涂用的粉末原料和涂层的显微结构、物相组成进行了观察与确定;利用环-块摩擦试验在干摩擦条件下对涂层的摩擦磨损性能进行了测试。结果表明,两种氧化锆涂层的摩擦系数均随载荷增大而减小。在较低载荷(100 N)条件下,S1涂层与不锈钢的摩擦系数低于B1涂层与不锈钢的摩擦系数;而在较高(400 N)载荷下,两种氧化锆涂层的摩擦系数开始趋于一致。其原因在于:较低的载荷下两种涂层与不锈钢摩擦副的摩擦磨损机制不同,S1涂层的磨损属于粘着磨损,B1涂层的磨损属于磨粒磨损;而在较高载荷下,两种涂层的磨损机制趋于一致,均为粘着磨损。
Two types of nano-zirconia coatings S1 (spray-granulated powder with smaller average particle size) and B1 (spray with larger average particle size) were prepared by atmospheric plasma spraying on stainless steel substrates with different particle sizes. Granulated powder derived). The microstructure and phase composition of the powder raw materials and coatings for spray coating were observed and determined by XRD, SEM, TEM, Raman spectroscopy and metallographic techniques. The ring-block friction test was carried out under dry friction condition The friction and wear properties of the coatings were tested. The results show that the friction coefficients of the two zirconia coatings decrease with the increase of load. At lower loads (100 N), the coefficient of friction between S1 coating and stainless steel is lower than the friction coefficient between B1 coating and stainless steel. At higher (400 N) load, the friction coefficients of the two zirconia coatings Began to be consistent. The reason is that under the low load, the friction and wear mechanisms of the two coatings and the stainless steel friction pair are different, the wear of the S1 coating belongs to the adhesive wear, the wear of the B1 coating belongs to abrasive wear, while under the high load, The coating wear mechanism tends to be consistent, are adhesive wear.