Preparation And Friction And Wear Properties Of Fe₃Si-Cu Composites

The melt point of Fe₃Si based ordered intermetallic is relatively high and itswear resistance and oxidation resistance are also believed to be good.So it is acandidate for hight temperature structural material. Fe₃Si contains two of the mostcost-effective elements.so,the application prospects of the Fe₃Si based intermetallicare good.However,the applications of Fe₃Si as structural material are hinderedbecause Fe₃Si is brittle and hard as other intermetallics.It is prerequisites for Fe₃Sias structural material to improve its toughness and to investigate its tribologicalproperties and high-temperature oxidation behavior.In the Present work, monolithic Fe₃Si based composites are prepared by twomethods,i.e.mechanical alloying followed by SPS hot pressings.The particle size ofthe powders of Fe₃Si based composites prepared by mechanical alloying isevaluated.Microstructure and tribological properties of bulk Fe₃Si based alloysprepared by SPS hot pressings are investigated.The following findings andconclusions are reached.First of all,based on alloying modification,mechanical alloying processes ofFe₃Si-Cu composites with different milling time are investigated.Findings indicatedthat Fe₃Si-Cu composites with Sub-micron level particle size can be prepared bymechanical alloying.Fe-Si Solid solution were obtained by milling of Fe₃Si-Cucomposites for3h.Secondly,Fe₃Si-Cu composite were fabricated by SPS hot pressings motivatedby the thought of improving the mechanical and tribological properties of Fe₃Sibased ordered intermetallic.Findings indicated that there is evenly distributed Cu inthe Matrix which is prepared by SPS hot pressings.And the longer the milling time is,the higher the hardness of the sintered materials.Finally,the tribological properties and wear mechanisms of Fe₃Si-Cu slidingagainst Si3N4at room temperature in air are investigated.Findings indicated that thesurface roughness of the material will affect the contact state. For the elastic orelastic-plastic contact,the lower the surface roughness,the greater the frictioncoefficient; The lower the sintering temperature,the smaller the particle size, thegreater the friction coefficient. And the wear rate of material which is milled for3his lower,the wear rate of material which is milled for3h or10h is higher.The content of Fe、Si and Cu in Worn surface each materials is different.