Development of Fe-P Matrix Composites Containing Embedded Solid Lubricants

2014 
In this work the processing of composites containing graphite or hexagonal boron nitride dispersed in a ferrous matrix alloyed with phosphorous was addressed, with the goal of developing self-lubricating sintered materials with high mechanical resistance. Phosphorous is an alloy element characteristic in powder metallurgy for promoting the formation of liquid phase and alpha phase at high temperature, wherein both phenomena are densification inducers. It is expected therefore with that to rearrange volumetrically the solid lubricant reservoirs, so permitting the composites to present better mechanical properties. In order to understand what really occurs at high temperature, sintering was studied in situ in a dilatometer. Furthermore, microstructural and mechanical properties were carried out to characterize the sintered parts. The main remark was that graphite reacts with the matrix going into solid solution and therefore not being disposed as solid lubricant after sintering. On the other hand, h-BN remains insoluble in the Fe-P matrix and without reducing drastically the strength of the composite.
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