| As lubricant-component, MoS2 is widely used in Iron-based P/M breaking materials. This paper studied in detail the change of M0S2 in Iron-based breaking materials in the course of sintering with adding pressure and H2. And the role of MoS2 in the course of friction and wear is also well studied.The results show: the M0S2 which has been widely applied in P/M friction materials as lubrication-component, is mostly decomposed to S and Mo during the course of sintering under pressure and the protect of H2 . The decomposed S can react on Fe in the course of sintering and form FeS. The decomposed Mo can solute in a-Fe.When sintering temperature is above 989C, FeS will react on Fe and form liquid phase: Y -Fe+FeS-L. This liquid phase is good for sintering. The solution of Mo in a-Fe can strengthen the friction material and increase the intension. During friction, with the content of MoS2 from 0 to 8wt%, the friction and wear property of materials increases firstly, and decreases then. The material of 4% M0S2 takes on excellent friction and wear properties and synthesis properties. In Iron-based P/M friction materials with M0S2, with the friction velocity increases, the temperature on the layer of friction material increase as well, great changes take place on the surface of friction material. At high speed, well friction layer has beenformed. The new phase FeS has the same layer frame as MoS2, so the work of MoS2 in P/M material is practically the lubricating of FeS, as well as the influence on mechanical and frictional property of material from the new phase formed by decomposed S MoThe results also show: the friction materials adding S and Mo in place of MoS2 have good friction and wear property at low and medium speed , but have bad property at high speed. |
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