Effect of double pressing/double sintering on the sliding wear of self-lubricating sintered composites

This work presents the effect of a double pressing/double sintering technique on the sliding wear of self-lubricating composites. The matrix composition was based on that of a Fe–Mo–C–Si alloy, and the solid lubricants were h-BN and graphite. Sliding tests were carried out first at a constant load. Subsequently, scuffing tests with loading steps of 7 N/10 min were also performed. The wear rates of both specimens and counter-bodies and the average friction coefficient were slightly affected by the compaction technique. DPDS specimens showed higher scuffing resistance. The scuffing resistance depends to a great extent on the mechanical support provided by the matrix. DPDS significantly reduced the sub-surface porosity and, as a consequence, the scuffing resistance.