Influence of load, time, speed on sliding tribology behavior of C/C composites

Using M2000 wear tester and MG1000 high temperature wear tester,the sliding tribology behavior of three kinds of C/C composites with different matrix carbon were investigated with 40Cr steel coated by Cr or(W_(18)Cr_4V) steel as couple.The result shows that in the ring-block sliding wear test,with time prolonging,the friction coefficient of all samples becomes more and more stable,and the mass wear loss increases.Among such samples,the samples with low density hold high friction coefficient between 0.130.18.In the pindish sliding wear test,at room temperature,under 20N test,the friction coefficient of the sample with rough lamination/smooth lamination/resin carbon is 0.13 and the mass wear loss after 1h test is 1.1mg,and those under 40N test are 0.10 and 0.9mg,respectively,and those under 60N are(0.15) and 3.9mg,respectively.At 200℃,the friction coefficient and mass wear loss increase quickly which varly(among)(0.160.27) and 4.15.8mg,respectively.During the time of running in,the friction coefficient and mass wear loss increases with time prolonging.After the running in,the friction coefficient decreases and the mass wear loss gets stable.With revolving speed increases,both the friction coefficient and mass wear loss increase.