Study On Thermophysical Properties And Mechanical Properties Of ZTAp/High Chromium Cast Iron Based Honeycomb Composites

ZTA_P?ZrO₂ toughened Al₂O₃ ceramic particles?is one of the most popular wear-resistant materials to enhance the honeycomb structure composite material of high-chromium cast iron,which perfectly combines the high hardness of ZTA ceramic particles with the metal toughness of high-chromium cast iron,and makes full use of the complementary relationship between the two,giving full play to its wear-resistance.However,ZTA_P reinforced high chromium cast iron-based honeycomb composites still have some cracking tendency,which may affect the appearance and production stability of wear-resistant parts.Therefore,in order to further improve the performance of ZTA_P reinforced high chromium cast iron-based honeycomb composites,it is important to study and reduce their cracking tendency.In order to improve the plasticity of the composite material and reduce the thermal stress of the composite material,the distribution of temperature field and stress field in the casting infiltration process of the composite material was simulated and analyzed.The difference of thermal expansion between composite material and high chromium cast iron was studied.The addition amount of ceramic powder which is beneficial to the composite material to obtain good interfacial bonding was explored.The structure of the precast body was optimized and its influence on the mechanical properties and wear properties of the composites was analyzed.The relationship between ZTA ceramic particle size and mechanical and wear properties of composites was investigated.Through the analysis of the simulation results of the stress field of the composite material,it is found that the effective stress of the composite casting is mainly distributed in the composite area.Composite material under different cooling speed and high chromium cast iron matrix deformation difference of the test results show that the cooling speed is 3?/s and 21?/s,and deformation of high chromium cast iron composite material difference is smaller.When the addition amount of ceramic powder is 8%,the interface bonding strength of the composite material is the best,showing excellent compression performance,impact toughness and wear performance.The compression strength is up to 1200MPa,and the impact toughness is 3.75j/cm².The test results of compression performance,impact toughness and wear performance of ZTA ceramic particle composites with different particle sizes showed that:among the selected particle sizes of 12 mesh,25 mesh,36 mesh and 90 mesh,when the particle size of ZTA ceramic particle was 90 mesh,the composite had the best deformation capacity and the best impact toughness.When ZTA ceramic particle size is 12 mesh,the wear resistance of composite material is the highest.The precast structure optimization method of adding small cylindrical holes with an aperture of6mm at the junction of the precast honeycomb wall can effectively improve the compressive strength and strain capacity of the composite material honeycomb wall composite area without obviously sacrificing the wear resistance of the composite material.Through research,it can be determined to preheat the ZTA ceramic precast body before pouring,select reasonable quenching and cooling rate,optimize the structure of the precast body,select the ideal ceramic micro-addition amount,and select the reasonable size of ZTA ceramic particles.It can reduce the cracking tendency of ZTA_p reinforced high chromium cast iron-based honeycomb composites to some extent,which is of great significance for practical production.