In this paper,the friction, wear behaviour, and wear mechanisms of in-situ transformed carbon fibre toughened alumina ceramic matrix composite were investigated. The 20vol% Cf/Al2O3 composites were fabricated by hot-press sintering in vacuum. Wear tests for 20vol% Cf /Al2O3 composite, commercial Al2O3 ceramic and 40Cr steel were conducted using a cylinder on blocks wear tester under PAO oil and PAO+carbon nanotube (CNT) as lubricants and at applied loads of 220N and 520N as well. The results show that the frictional coefficient of these three materials at 520N are lower than at 220N and that 20vol% Cf/Al2O3composite presents the lowest frictional coefficients. The wear resistance of 20vol% Cf/Al2O3 is at least 10 times higher than 40Cr and 1.8 times higher than Al2O3 in both PAO oil and PAO+carbon nanotube(CNT) lubricants. The wear mechanisms of these three materials are different. 40Cr presents ploughing and local deformation and even tearing, Al2O3 shows spalling and grinding, and 20vol% Cf/Al2O3 demonstrate slight spalling and shallow ploughing. These results show that in-situ transformed carbon fibres play a toughening role in Al2O3 ceramic and the PAO+CNT lubricant has better lubricative role than PAO oil.
Wear – Elsevier
Published: May 1, 2015
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