Study On The Influence Mechanism Of Aluminum And Copper Element Addition On The Properties Of Ti(C,N)-Based Cermets

Metal cutting is an important processing method for material forming.With the rapid development of manufacturing industry,people's requirements for cutting tools are increasing.Advanced cutting technology can greatly improve production efficiency,reduce costs,and obtain high-quality products.Traditionally,cemented carbide is used as a cutting tool,but it consumes more strategic materials W and Co.As a new type of processing tool material,Ti(C,N)-based cermet has the characteristics of wear resistance,corrosion resistance and oxidation resistance,especially in the field of high-speed cutting.At present,the strength and toughness of cermet tools still needs to be improved.In practical applications,it will inevitably be exposed to high temperature,corrosion,abrasion and other environments,which will further affect the service performance of the material.Therefore,this article aims to study the influence mechanism of the addition of Aluminum and copper elements on the properties of Ti(C,N)-based cermets,and to improve the overall performance of Ti(C,N)-based cermets,which has extremely important social significance.The main results of this project are as follows:(1)The influence mechanism of Al N additives on the structure and properties of Ti(C,N)-based cermets was systematically studied.The results show that the Al element is dispersed in the binder phase where Ni and Co are located,and part of it exists in the form of(Ni,Co)₃Al type intermetallic compounds.In the liquid phase sintering process,Al element will hinder the growth of Ti(C,N)particles and strengthen the binder phase,which improves the mechanical properties of cermets.In the oxidation weight gain experiment,the formation of Ti O₂,(Ni,Co)Ti O₃and other oxide films reduces the oxidation weight gain rate of cermets.At different cutting speeds,the addition of Al N can effectively slow down the wear of cermet tools and improve the cutting performance of the tools.In addition,Al N additives can improve the corrosion resistance of Ti(C,N)-based cermets in alkaline solutions.During the electrochemical corrosion process,the binder phase is preferentially dissolved,and oxidation products such as Ti O₂and Co(OH)₂effectively protect the cermet from further corrosion.(2)The effects of different Aluminum additives on the microstructure and properties of Ti(C,N)-based cermets were systematically investigated.The results show that the Aluminum in the three additives(Al N,Al,Ni₃Al)diffuses into the binder phase and improves the densification process of cermet.Three additives can reduce the oxidation weight gain rate.Among them,Al N has the best effect,followed by Al,and finally Ni₃Al.Three Aluminum additives can improve the wear resistance of cermet.Among them,the wear scar depth of cermet containing 1.32%Al is the shallowest,followed by 1.0%Al N and 0.66%Al.In alkaline solution,Al N reduces the corrosion rate of cermets compared with cermets without Al addition.Al additive accelerates the corrosion rate of cermets.When the content of Ni₃Al additive reaches10.14%,the corrosion rate of cermets will be reduced.(3)In this paper,the influence mechanism of Cu additive on the microstructure and properties of Ti(C,N)-based cermets was studied.The results show that the Cu additive will diffuse into the binder phase and exist in the form of Ni-Co-Cu single-phase solid solution.In the liquid phase sintering process,appropriate content of Cu can refine Ti(C,N)grains by inhibiting the dissolution-precipitation process of hard phase.Fine grain strengthening and solid solution strengthening mechanism can effectively improve the mechanical properties of cermets.The improvement of mechanical properties and the anti-wear effect of copper materials effectively enhance the wear resistance of cermet.In acid solution,Cu additive enhances the corrosion resistance of cermets by strengthening the binder phase and promoting the formation of Ti O₂,Cu_xO and other oxidation products during the corrosion process.