Preparation and Properties of Al-Mg-MnS Composites
Self-lubricating aluminum matrix composites have many advantages such as low density,high specific strength,good electrical and thermal conductivity,low thermal expansion coefficient and low cost.Therefore,they have broad application prospects in aerospace,national defense and many civilian fields.In the process of the study of aluminum-manganese sulfide composites,it was found that the interface between manganese sulfide and aluminum matrix had poor wettability.Therefore,in order to solve the interface bonding problem between the manganese sulfide particles and the aluminum matrix,the factor that Mg has a high solid solubility in the aluminum matrix was considered.Mg was added to the aluminum-manganese sulfide composite,then Al-Mg-MnS composites were prepared using powder metallurgy.The effects of different Mg contents on the microstructure,electro-mechanical properties,friction and wear properties of the composites were discussed,and then the lubrication mechanism was analyzed.The results show that during the sintering process,magnesium significantly improve the interfacial bonding strength of the composites and improve the wear resistance of the composites;When the content of Mg is 5％,the composite exhibits the best comprehensive properties,with a tensile strength of 338 MPa and an elongation of 10.9％;The addition of a small amount of magnesium does not affect the conductivity of the material,and Al-Mg-MnS composites with excellent comprehensive properties can be obtained.
self-lubricating aluminum matrix compositesmicrostructurefriction and wear
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