Study On The Preparation And Wear Properties Of ZTA/High Chromium Cast Iron Composites

Jaw crusher,impact crusher,vertical mill,etc.are widely used in mining,metallurgy,chemical industry,electric power and other industries to crush ore,coal and other materials.Jaw plates,plate hammers,grinding rollers and grinding discs are the main wearing parts.These components interact directly with the material,causing rapid wear and requiring frequent replacement,which results in significant material consumption.For this reason,research to improve the service life of these components,as well as the development of new materials,to improve the abrasion resistance,are urgent problems that need to be solved at present.An effective way to solve this problem is to develop a composite material of ceramics and metals,and give full play to the wear resistance mechanism of ceramics and the good toughness of metals.Therefore,it is of great practical value to study the preparation of ceramic particle reinforced iron-based composites.In this paper,high-chromium cast iron,zirconia-toughened alumina(ZTA)ceramic particles,active additives Ti powder,Ni powder,and B4C powder are used as raw materials.Interface bonding state,interface bonding strength and abrasion resistance.Alumina ceramic particles with ZrO2 content of 25%and Cr15 high chromium cast iron were selected,and the effects of the additives Ti,Ni,and B4C on the bonding interface between ceramic and high chromium cast iron were studied.The porosity of the ZTA ceramic body prepared by pressureless sintering can reach 39%,and the volume fraction of ceramic particles can reach 43%of the ZTA/high chromium cast iron composite material prepared by pressureless infiltration.The ceramic particles are completely wrapped by high chromium cast iron,and the two interfaces are tightly bonded,which improves the combination effect of the two.Ti,Ni,and B4C powders can all improve the wettability of ceramics and high chromium cast iron.During the infiltration process,Ti and B4C powders easily migrate and aggregate at the interface,and the Ni element can be dissolved in the high chromium cast iron matrix.It was found that during the sintering process,Ni will further promote the migration of elements and cause it to aggregate on the interface,and participate in the reaction between ZTA ceramics and the molten iron,thereby improving the wettability of the two.The Brinell hardness of ZTA/high chromium cast iron composites is higher than that of as-cast 15Cr,especially the hardness of the composites after heat treatment is higher than that of no composites.Among the three kinds of composites,the hardness of the composites with B4C is the highest.At the same time,it was found that the hardness of composites with 10%additive was higher than the hardness of 12%of the same additive under the same conditions.The flexural strength of the composite material indicates that the flexural strength of the composite material with the additive content of 12%is higher than that of the composite material with the additive content of 10%.And among the three additives,the bending strength of the ZTA/high chromium cast iron composite material with Ti as the additive is higher than that of Ni,B4C as the additive.The fracture mode of ZTA/high chromium cast iron composites is obvious brittle fracture.In addition to fracture along the interface of ZTA particles and high chromium cast iron,there is also fracture through ZTA particles.This also shows the firmness of the interface between ZTA particles and high chromium cast iron.The three-body abrasive wear test results compared with 45 steel show that the wear amount of ZTA/high chromium cast iron composite is significantly lower than that of 45 steel,and its relative wear resistance is greater than 3,that is,the wear resistance of the composite is three times that of 45 steel.the above.The wear failure modes are mainly cutting wear of high chromium cast iron and brittle spalling of ZTA,which changes the wear mechanism of high body chromium three-body wear,which is usually short-range micro-cutting and plastic fatigue wear,thereby improving the resistance of high chromium cast iron.Abrasive,additive amount is 12%,the wear resistance of composite materials is higher than 10%.