Research Of The Preparation Technology And Performance For Ti(C,N)/Fe Composites

As an important branch in the composite, Metal matrix composites were developedrapidly and applicated widely in recent decades, in the early development of metalmatrix composites,the researchon metal matrix composites mostly focus on glass fiberreinforced plastic, but with the development of industry and the deepening of theresearch about composite material,people found the traditional composite material(forexample: polymer matrix composite) are greatly limited,when it is applicated in hightemperature condition and other special conditions.Particles reinforced iron matrixcomposite materials were developed greatly in recent years, as it not only has the highhardness, high strength, and high melting point but also has the good machiningperformance and high thermal conductivity. As a structure engineering materials, Iron isthe most commonly used, so there are great value in improving and enhancing theperformance of the iron matrix composite material. In this paper, Ti(C,N)/Fe compositeswere prepared from TiFe(w(Ti)=30%), FeNCr(w(N)=5%,w(Cr)=60%), toner and Ti byin-situ since birth technique.Besides,in order to improve the comprehensive mechanicalproperties of Ti(C,N)/Fe composites, Ti(C,N)/Fe composites were prepared by VacuumHot-pressed Sintering.In addition, the composition,microstructure, sintering processparameters and friction and wear performance of the composite material wereresearched systematacially.The effect of different content of Ti(C,N) and sintering process on themicrostructure and mechanical properties of Ti(C,N)/Fe composite material wasinvestigated systemically. The experimental results show that the better flexural strength,fracture toughness and hardness of Ti(C,N)/Fe composite material(the content of Ti(C,N)is30%) reaches838MPa,15.62MPa·m1/2and9.58GPa, respectively by means of thevacuum hot pressing technique at1300℃for60min at20MPa.Compared to thetraditional metal materials, although the flexural strength and fracture toughness havebeen decline slightly, the hardness of Ti(C,N)/Fe composite material hasbeen improvedgreatly,comprehensive mechanical properties have been improved. Microscopicstructure is concerned, the Ti(C,N)/Fe composite material prepared in this way hasuniform organization, small and uniform grains,which have dispersion hardening effectfor the Ti(C,N)/Fe composite material.In the process of fracture, the typical mixedgranular fracture modes were happened. The effect of different content of Ti(C,N) and sintering process on the frictioncoefficient and friction coefficient of Ti(C,N)/Fe composite material was investigatedsystemically.Besides, the wear morphology of Ti(C,N)/Fe composite material wereresearched with a environment scanning electron microscopy(SEM),and the phasecomposition were studied by X-ray diffraction(XRD).The research shows that the wearmechanism of Ti(C,N)/Fe composite materialis abrasive wear and adhesive wear.