Preparation Of Zirconia Corundum Ceramic Particles / High Chromium Cast Iron Honeycomb Composites

With the development of technology and escalating industrialization.the wear loss of material are becoming more and more terrible. Traditional wear resistant material of iron could not satisfy the need of wear resistant equipments.As ceramic particle reinforced metal matrix wear resistant composites(CPRMMC) own the features of high modulus,specific strength,wear resistance,thermal stability and the the metal own the characteristics of excellent ductility,impact resistance,process capability,CPRMMC was the first choice to replace the traditional wear resistant material of iron,However,Currently the preparation of the CPRMMC is still in the stage of laboratory research,For the few of its applied research on large wearable devices, Large composite wear parts are imported.Therefore,the applied research of CPRMMC has great practical significance.With the aspect of defects of full layer composite material.we optimized the design of CPRMMC structure,considering the metal infiltration within preform and characteristics of composite material,ceramic particles were prepared with the structure of porous honeycomb to ensure metal could infiltrate into the preform comprehensively and in all aspects.then the infiltration capability of metal was improved strongly,and the thickness of composite layer could reach70-80mm with a good process stability of material.furthermore,with the structure of porous honeycomb of composite layer,impact abrasion capability of material was improved,and it was favorable to hold the fracture and exfoliation of full composite layer.The porous structure,size of porous honeycomb preform were main factors which determined the capability of composite material process.this article discussed the merits and defects of the cylindrical and hexagonal prism structure,It was concluded that hexagonal prism structure could improve the infiltration capability of metal,and it could also make the ceramic particle distributed more homogeneously,this improved the property of material,It is showed that under the same volume of molten metal in the columnlike structure and same thickness of preform,lateral area of regular hexagonal cylindrical hole was5.1%larger than area of cylindrical hole.this increased the contact area between molten metal and preform.This article discussed the effect on the properties and process of composite material of ceramic particle category.and it is show that zirconia-alumina was an excellent substitute of common alumina ceramic,with the aspects of ceramic particle size and shape, effect on accumulation porosity and pore diameter of these factors were discussed.the results show that grain size of F12could ensure the maximum pore diameter and this was beneficial for molten metal breakthrough the surface tension to flow within preform,the lower sphericity with same grain size of ceramic particle,the the higher porosity were created within preform,and this improved the infiltration capability of molten melt within preform.In this paper,Improve penetration of liquid metal by Add different third substance In preformed body.the result show that alloy particle added in the preform must own low melt point with the property of self-fluxing.and the weight proportion better no more than20%of ceramic particles,or many cast defects will appear.with a new perspective,we introduced a mechanism of promoting the molten metal infiltration by using B4C,results show that B4C of large grain size could promote the penetration of molten metal in a certain extent,but the effect is not so obvious.while after ceramic particles were packaged by B4C powder,the penetration capacity were strongly improved.then composite material which own little defects and thick composite layer could be prepared more successfully.With the aspects of theory,the effect of B4C powder which packaged the zirconia-alumina grain was discussed.and combined with the widely used theory of Mo-Mn in ceramic-metal sealing and the oxide system sealing theory.it is show that B4C began to be oxidized after temperature exceeded600℃,and B4C could thoroughly be converted into glass phase B2O3after it was calcined in air of800℃by21h,and B2O3could react with A12O3at1000℃～1250℃,then they combined and converted into9A12O3·2B2O3Columnar crystal,and it had good denseness and strong intensity at medium and high temperature,under the condition of1000℃～1100℃,transition metal element of IV, V and VI in periodic table could strongly react with B4C and create metal borides,by the diffusion of B2O3at the surface of ceramic grain and the reaction product between B4C and molten metal.a weak bonded surface could be created between metal matrix and ceramic grain.and this improved the their bond strength.