Effects Of ZTA_P/High Chromium Cast Iron Matrix Composites Configuration On Compression And Wear Properties

With the continuous advancement of industrialization,the traditional single wear-resistant material has been difficult to meet the performance requirements of the core wear-resistant parts in the fields of metallurgy,electricity and building materials.Compared to traditional wear-resistant materials,the design of honeycomb configuration in ZTA_P/high chromium cast iron matrix composites makes ZTA ceramic particles with high hardness work well with the high chromium cast iron metal with certain toughness,which can significantly improve the wear performance of the material while avoiding the occurrence of local spalling of the composite layer.Among them,the structure parameters of honeycomb composites have a significant effect on the material properties.In this paper,the microstructure,compression mechanical properties and three-body abrasive wear properties of ZTA_P/high chromium cast iron matrix honeycomb composites with different hole structure,hole size and hole wall structure were characterized and tested.And,the influence mechanism of structural parameters on material properties was explored,in order to obtain the optimal structural form and parameters.Through the above research on the influence law and action mechanism,it is found that when the preform hole structure is regular hexagon and circle,the dispersion uniformity of the ceramic particles in the corresponding composites is good.Among them,when the hole/hole wall ratio with the regular hexagonal hole structure is 1.25 and 1.43,the dispersion uniformity is relatively better.When the hole/hole wall ratio of the preform is 1.25 under the regular hexagonal hole structure,the corresponding composites has the highest compressive strength,reaching 1240MPa.When the composites are subjected to external forces,cracks mostly occur at the junction of the ceramic particle reinforcement and the metal matrix.The uniformly distributed ceramic particles have a certain inhibiting effect on the crack propagation.With the continuous expansion of cracks,crack networks are easy to form at the junction of multiple cracks and eventually forming pit defects in the composites and reducing the compression mechanical properties of the composites.Among the different hole structures,the composites with regular hexagonal hole structure has the best wear performance.After selecting regular hexagon as the hole structure,the tests show that under the regular hexagonal hole structure,the preform hole/hole wall ratio is 1.25,the wear angle is 90°,and the percentage of the flat area of the hole wall is 50%,the wear resistance of the corresponding composites is the best.And,the influence law of structural form and parameters on wear resistance of composites is still applicable after heat treatment.The more uniform ceramic particles and more uniform hole wall thickness in the composite with regular hexagonal hole structure improve the wear performance of the composites.Among the composites with hole/hole wall ratio of 1.25 under regular hexagonal hole structure,the protective effect of ceramic particle reinforcement on the metal matrix and the fixation and support effect of metal matrix on the ceramic particle reinforcement were well coordinated,which made the composites with this ratio have the best wear resistance.When the wear angle is 90°and the percentage of the flat area of the hole wall is 50%under the regular hexagonal hole structure,the“macroscopic shadow effect”in the corresponding composites is more significant,which is beneficial to the wear performance of the composites.This article provides some guidance for the configuration design of honeycomb composites,and provides a certain reference for engineering applications of composites.