Mg-PSZ陶瓷在不同环境温度下的摩擦磨损行为与机制研究

Study on Friction and Wear Behaviour of Mg PSZ Ceramics at Different Environmental Temperatures

研究了氧化镁部分稳定氧化锆陶瓷（Ｍｇ－ＰＳＺ）在不同环境温度下的摩擦磨损行为与机制．结果表明：室温时，Ｍｇ－ＰＳＺ陶瓷的磨损机制主要是微观犁削和微观断裂；温度为２００ ℃时，陶瓷磨损表面形成的针（轴）状磨屑呈现“滚动轴承”效应，表现出最低的摩擦系数和磨损率；随着温度的进一步升高磨损率增大；４００ ℃以上时可使偶件的磨损率急剧上升，其磨损机制则转变为脆性断裂和晶粒剥落．

The friction and wear properties of Mg PSZ ceramics under dry sliding from room temperature to 600 ℃ were investigated using a ball on flat tribometer. It is found that Mg PSZ/TZP couple has the lowest friction coefficient and wear rate at 200 ℃ because of the formation of many cylindrical debris acting as the rolling bearing on the worn surface of Mg PSZ ceramic. The wear mechanism of Mg PSZ ceramic is micro ploughing accompanied by microcracking at room temperature. The wear rate rapidly increases and the wear mechanism gradually changes into brittle fracture and spalling of grains with the increase of environmental temperature.