Effect Of Ni60 Coating On The Interface,Compression And Wear Resistance Of ZTAp/High Chromium Cast Iron Matrix Composites

With the current increasingly severe wear conditions,traditional single metal wear-resistant materials have been embarrassed.At the same time,ZTA_P(ZrO₂toughened Al₂O₃ ceramic particles)reinforced high-chromium cast iron matrix composites combined the high hardness of ZTA ceramic particles with the toughness of high-chromium cast iron and made full use of the complementary relationship between the two,maximized its wear resistance.It become a new favorite in the field of wear-resistant materials.However,with the application and in-depth study of ZTA_P-reinforced high-chromium cast iron matrix composites,the current ZTA_P-reinforced high-chromium cast iron matrix composites still have problems such as unstable interface formation and low interface bonding strength,which has affected the composites in high application.Stress and wear resistance under complex working conditions with a certain impact load.Therefore,in order to improve the interface bonding strength of the ZTA_P reinforced high-chromium cast iron matrix composite reinforcement and the matrix metal,a suitable industrial production process was developed to study the surface coating of ceramic particles Powder to promote the body.The process method to promote interfacial reaction is very important to further enhance the application prospect of ZTA_P reinforced high-chromium cast iron matrix composites.From the perspective of improving the efficiency and bonding strength of the interface between the ceramic reinforcement phase and the matrix metal in the ceramic particle-reinforced metal matrix composite,the coating process on the surface of the ceramic particles is simplified,and the Ni60 self-fluxing alloy powder is used as the connecting medium for ZTA ceramics.Influence of the formation of the interface between particles and high-chromium cast iron.The mass fraction of nickel 60self-fluxing alloy powder in the coating is15%,25%,30%,35%,40%,45%,and50%,respectively.The influence of morphology and interface element distribution is discussed.The compression resistance and impact abrasive wear resistance of the composite material are conducive to the improvement of ZTA_P,the content of Ni60self-fluxing alloy powder is optimized,and the high-chromium cast iron matrix composite material is formed.A continuous and uniform interface transition layer.Experiments show that the content of Ni60 self-fluxing alloy powder in the coating is 25%of the composite material,and the compressive strength is946.59MPa.The composite material with the Ni60 self-fluxing alloy powder content of25%-35%in the coating has good impact abrasive wear resistance.To a certain extent,ZTA ceramic particles can prevent the cracks of the base metal from further spreading.The presence of Ni60 self-fluxing alloy powder in the coating can effectively promote the formation of a reaction interface transition layer between ZTA ceramic particles and high-chromium cast iron.To a certain extent,the interface bonding strength between ZTA ceramic particles and high-chromium cast iron metal matrix is enhanced.During the interface reaction,Ni60 self-fluxing alloy powder promotes the diffusion of Al element in the ZTA ceramic particles to the interface transition layer,but has no obvious effect on the diffusion of the Zr element,thus forming on the side of the ZTA ceramic particles in the interface transition layer Zr element enrichment.In view of the fact that the volume fraction and interface transition zone of ZTA particles in ZTAP-reinforced high-chromium cast iron matrix composites are critical to their interface and performance,in this subject,the volume fraction of composite particles is coated with Ni60 self-fluxing alloy powder on the surface of ZTA ceramic particles As well as the influence of interface properties,this paper uses DIGMAT software to establish a ZTA/HCCI composite unit cell model,and uses ANSYS to perform heat treatment and residual thermal stress analysis on ZTA particle reinforced high chromium cast iron matrix composites with different ZTA particle volume fractions and interface transition zone widths It was found that the volume fraction of ceramic particles in the composite material and the width of the interface transition zone formed between the ceramic particles and the matrix metal have an effect on the residual thermal stress of the composite material after heat treatment.Through the analysis of the composite material stress field simulation results,it is found that in the ZTA ceramic particle reinforced high chromium cast iron composite material,the residual thermal stress is mainly concentrated in the boundary area of the ceramic particles and the matrix metal,and the presence of the interface transition layer can significantly reduce the composite material.When the interface width is 10?m,the maximum residual thermal stress in the composite is the smallest,which is 1/2 of the maximum residual thermal stress in the composite without interface transition layer.The surface of the ZTA ceramic particles is coated with Ni60 self-fluxing alloy powder to promote the formation of a continuous and uniform reaction interface transition layer between the ZTA ceramic particles and the high-chromium cast iron matrix,thereby improving the bonding strength of the ZTA and high-chromium cast iron interface,and providing practical production Process reference,improve the service life of industrially produced ZTA particle reinforced high chromium cast iron matrix composite wear-resistant parts and its applicability to complex working conditions.