不同气氛环境中纳米Al_2O_3/PTFE复合材料摩擦磨损特性研究

Study of Tribological Properties for Al_2O_3/PTFE Composites in Different Atmosphere Environment

利用QG-700高温气氛摩擦磨损试验机,考察了PTFE及其纳米Al2O3复合材料在干摩擦条件下,在氧气、50%氧气/50%氮气、空气及氮气等气氛环境中的摩擦磨损特性。采用JSM-5610LV型扫描电子显微镜对摩擦表面进行观察,采用EDAX能谱分析仪分析表面成分,研究了干摩擦条件下气氛对复合材料摩擦学性能影响的机制。结果表明:在试验研究范围内,纳米Al2O3的加入可减小PTFE复合材料的磨损量,提高材料的抗磨性能;PTFE和3%Al2O3/PTFE复合材料在氧气环境气氛下的摩擦因数最小,而在氧气和氮气环境气氛下的摩擦因数最大,但磨损量最小;氧气气氛环境最有利于提高PTFE及其复合材料的摩擦学综合性能,氮气环境次之,氧气和氮气环境则有利于增强材料的抗磨性。

The tribological properties of 3% Al2O3/PTFE composites were studied using QG-700 high temperature friction and wear tester in the environments of oxygen,50% oxygen/50% nitrogen, air and nitrogen atmosphere. The wear mechanism of PTFE and its composites in different atmosphere environments under dry sliding conditions was discussed by observing worn surface morphologies with JSM-5610LV SEM and analyzing the surface composition with EDAX spectrum analyzer. The results indicate that the addition of nano-Al2O3 could reduce the wear of PTFE composites, and improve the anti-wear property. The PTFE composites have the smallest friction coefficient in the oxygen atmosphere, and have the lar-gest friction coefficient in oxygen and nitrogen atmosphere, but the wear mass loss is the smallest in oxygen and nitrogen at- mosphere. Oxygen atmosphere environment is the most beneficial to improving the tribological performance of PTFE com- posites, oxygen and nitrogen atmosphere environment is beneficial to enhancing the anti-wear performance.