温度对TiAl合金及SiC配副摩擦磨损性能的影响

Effects of Temperature on Friction and Wear behaviors of TiAl Alloy and SiC Counterpart

摘要:

通过对TiAl合金与SiC配副在20℃，300℃和600℃下的摩擦磨损性能研究，分析了摩擦系数，磨损率和磨损形貌随温度的变化规律，探讨了磨损机制。结果表明：在实验温度条件下，TiAl合金的磨损率随温度的增大而增大。在20℃下TiAl合金主要为犁削磨损、磨粒磨损，随着温度的升高，出现氧化磨损，当温度增加到600℃时，氧化磨损严重；而SiC配副在20℃下的磨损率显著高于300℃及600℃下的磨损率，这是由于随温度的增加，SiC球的破坏机制由沿晶断裂向削层磨损转变。

Abstract:

The friction and wear properties of TiAl alloy were measured using a ball-on-disc type tribometer under sliding against SiC counterpart in dry condition an different temperature (20℃，300℃ and 600℃). The relationship between temperature and wear rate, friction coefficient, and topography of wear mark as well as wear mechanism of TiAl alloy was discussed. The results shown that the wear loss of TiAl alloy increased with the rise of temperature, the wear mechanisms of TiAl alloy are grinding abrasion and grain-abrasion at 20℃, and the oxidation abrasion increased with an increase in temperature, especially at 600℃. However, the wear loss of SiC counterpart is obviously higher at 20℃ than that of 300℃ and 600℃, this is because the wear mechanisms of SiC counterpart translation from intergranular fracture to delamination abrasion with the increase of temperature.