Abstract:The tribological behavior of selfmated 1Cr18Ni9Ti at different temperatures,such as 21,100,200,300 and 400 ℃ was investigated on MMUD10B pin disk friction and wear tester.The wear track and debris morphologies were characterized by measuring metallographic microscope and scanning electron microscope (SEM),and the micro element analysis of the wear debris was carried out by energy dispersive spectrometer (EDS) equipped with SEM.The results show that the friction coefficient and wear rate of the selfmated 1Cr18Ni9Ti are first increased and then decreased with the increasing of temperature,the friction coefficient and wear rate reach the maximum value at temperature of 200 ℃.The wear mechanism is adhesive wear and abrasive wear at the temperature from 21 ℃ to 200 ℃,while the three mechanisms of adhesive wear,fatigue wear and oxidation wear act on the friction process at the temperature from 200 ℃ to 400 ℃.A strong oxidation reaction occurrs for the selfmated 1Cr18Ni9Ti in the high temperature friction to form a stable oxidation resistant layer containing Ni and Cr on the surface of the friction pairs,resulting in a decrease in friction coefficient and wear rate.