Abstract

The TiB2-MoS2 composite films had been produced by DC magnetron sputtering for developing new lubricious films used at high temperatures. The composite films had excellent frictional properties with a friction coefficient of about 0.07 at R.T. even in dry conditions. Furthermore, the friction coefficients of the composite films became as low as 0.01 at 200 ˚C, although those of TiN-MoS2 composite films were above 0.2 at high temperatures. However, the frictional properties of the TiB2-MoS2 composite films deteriorated due to desorption of B by heating above 500 ˚C. Therefore, it was required to improve the frictional properties at above 500 ˚C for applying them to sliding parts used at high temperatures. In this study, B was excessively added to the composite films in order to prevent the desorption of B in heat treatments of 500 ˚C. The TiB4.4-MoS2 composite films showed a low friction coefficient of 0.03 at 200 ˚C and the excellent wear properties were maintained after heating at 500 ˚C. The formation and melting of boron oxide on the sliding surface was thought to be a reason for the low friction coefficients even after heating at 500 ˚C.

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