Abstract

Molybdenum disulphide (MoS 2) is a well-known and widely used solid lubricant. As such, it might also be a useful addition in the production of composite self-lubricating high-speed steel parts which are used in different anti-wear applications. MoS 2 might also have a favourable influence on the synthesis of sintered HSS. In view of this, the compressibility and the sinterability of M3/2 and M35 types of HSS powder mixtures with MoS 2 additions were investigated. In this paper, the influence of MoS 2 on the densification during vacuum sintering of selected HSSs is presented. It has been established that the densification of HSS-MoS 2 powder mixture proceeds by a combination of a reactive and super-solidus liquid-phase sintering process. The added MoS 2 reacts with the steel matrix, enhancing densification. Complex sulphides (Cr, V, Fe)S are formed, whilst the Mo enriches the steel matrix and forms complex carbides with other alloying elements.

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