Ag-Cu-Sn/金属陶瓷润滑层高温摩擦配副特性研究

Wear Behaviors of Sn-Ag-Cu Cermet Lubricating Coatings with Different Materials at High Temperature

以多孔金属陶瓷为基体,以Sn-Ag-Cu系低熔合金为固体润滑剂,采用真空/压力熔渗技术制备Sn-Ag-Cu/陶瓷高温内梯度润滑层材料。在高温摩擦试验机上研究该润滑层材料与2Cr13钢盘及Al2O3陶瓷盘配副时的高温摩擦磨损性能,并利用EDS及扫描电子显微镜分析在不同配副时的摩擦磨损机制。研究结果表明:在600℃左右工作时,该润滑层材料与2Cr13盘和Al2O3陶瓷盘配副时都保持了较低的滑动摩擦因数(0.26);在较低温度区间(300~600℃),该润滑层材料与Al_2O_3盘配副时的摩擦因数较低,而在温度大于600℃时,该润滑层材料与2Cr13钢盘配副时的摩擦因数较低;在试验的温度范围内(300~700℃),该润滑层材料与Al_2O_3陶瓷盘配对时磨损率较低,表现出更好的的耐磨性。在温度大于500℃时,该润滑层材料与2Cr13钢盘配对时主要发生黏着磨损和氧化磨损,与Al2O3陶瓷盘配对时主要发生磨粒磨损和黏着磨损。

Sn-Ag-Cu/ceramic high temperature inner gradient lubricating coating material was prepared by using porous metal ceramic as base and Sn-Ag-Cu low melting alloy as solid lubricant and with the vacuum/pressure infiltration technology. The high temperature friction and wear properties of the lubricating coating material paired with 2 Cr13 steel plate and Al2O3 ceramic disc were studied on the high temperature friction tester. The friction and wear mechanism of the lubricating coating was analyzed by EDS and scanning electron microscopy. The results show that the lubricating coating material keeps a low sliding friction coefficient（ about 0. 26） when it is paired with 2 Cr13 disc or with Al2O3 ceramic disc under the temperature about 600 ℃. In the lower temperature range（ from 300 ℃ to 600 ℃）,the lubricating coating material paired with Al2O3 plate has a lower friction coefficient. While the temperature is more than 600 ℃,the lubricating coating material paired with 2Cr13 steel plate has a lower friction coefficient. In the test temperature range（ from 300 ℃ to 700 ℃）,the lubricating coating material paired with Al2O3 plate has a lower wear rate and better wear resistance. When the temperature is more than 500 ℃,the adhesion and oxidation wear mainly occurs between the lubricating layer material and the 2Cr13 steel plate,while the abrasive and adhesive wear mainly occurs between the lubricating layer material and the Al2O3 ceramic plate.