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《China Surface Engineering》 2015-04
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Friction and Wear Properties of C/C Composites Used as Sealing Materials

ZHANG Bo;LI Rui-zhen;XIE Hui-zhen;DENG Hai-liang;Xi'an Aerospace Composite Materials Research Institute;National and Local Union Engineering Research Center of High-performance Carbon Fiber Manufacture and Application;  
To solve the problem that the seal component of the turbine pump of a liquid rocket engine is badly worn the friction coefficient and line wear of C/C composites(heat-treated at different temperatures 2 250℃,2 400℃and 2 500℃)to GCr15 steel vice were tested on the MVF-1A multifunction vertical friction and wear machine under the conditions of lower load but higher line speed(12N,2.25m/s),higher load but lower line speed(50N,1.25m/s).The effects of heat-treated temperature(HTT)on tribology of C/C composites were investigated,the wear surfaces morphologies were examined by SEM,and the element of the wear surfaces were analyzed by EDAX.The results show that the samples heat-treated at 2 250 ℃ attain the lower degree of graphitization,higher flexural strength,lower friction coefficient and a larger amount of line wear.With the increase of HTT,the degree of graphitization increases,the interface bonding strength is weakened,and the flexural strength decreases.When the HTT of the samples is raised to 2 500 ℃,the friction coefficient increases but the line wear decrease.The SEM shows that it is easy to form an integrated and dense film on wear surface,and the mechanism of wear is transferred from abrasion to adhesion wear.Additionally,under the high load condition,appropriately increasing the line speed(1.50m/s and 1.88m/s)can help to reduce the friction coefficient and line wear.Heat-treated at high temperature(2 500 ℃)can improve the wear resistance of the C/C composites and better meet the seal component requirements.
【Fund】: 国家自然科学基金(51202233)
【CateGory Index】: TB332
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