Research on the Friction and Wear Mechanism of Si3N4 Bearing Materials Under Low Temperature Conditions
摘要
This manuscript focuses on the application of Si3N4 all ceramic ball bearings under low temperature conditions, conducting experimental research on the friction and wear performance of Si3N4 with different surface roughness under low temperature conditions, and comparing it with GCr15 bearing steel under the same working conditions. The results indicate that as the temperature of the experimental environment decreases, the friction coefficient and wear rate of Si3N4 gradually decrease. The friction coefficients of the three specimens with different surface roughness at − 160 °C decreased by about 16.2, 15.3, and 15.1%, respectively, compared to those at 20 °C. The wear rate of the specimen with a surface roughness of Ra0.08 μm gradually decreased from 5.17 × 10–6m3/m N at 20 °C to 5.37 × 10–7 m3/m N at − 160 °C. As the surface roughness of Si3N4 increases, the friction coefficient and wear rate gradually increase. At − 160 °C, the friction coefficient of the specimen with a surface roughness of Ra0.08 μm is 0.487 and the wear rate is 5.37 × 10–7 m3/m N, while the friction coefficient of the specimen with a surface roughness of Ra0.32 μm is 0.510 and the wear rate is 7.50 × 10–7 m3/m N. Moreover, the influence of temperature changes on the friction and wear characteristics is greater than that of roughness changes. The wear removal mechanism of Si3N4 gradually changes from transgranular fracture to intergranular fracture with the decrease in ambient temperature, indicating that Si3N4 has good self-lubricating performance under low temperature conditions. Through the research in this manuscript, the application performance of Si3N4 all ceramic ball bearings under low temperature conditions is studied. The relevant research results provide theoretical and technical references for the development of high-performance Si3N4 all ceramic ball bearings suitable for low temperature conditions, and provide technical support for promoting the development of high-performance bearing technology.