Effect Of Preform Sintering On The Depth Of Pressureless Infiltration Of Al₂O₃p/High Manganese Steel Composite

Al₂O₃ particle-reinforced steel-based composite materials have been widely researched and applied as an emerging wear-resistant material due to its wide range of raw material sources,relatively low price,high strength and excellent wear resistance.The liquid infiltration method for preparing Al₂O₃ particle-reinforced metal matrix composites has the characteristics of low cost,formable large parts and complex parts,and has received extensive attention.However,due to the poor wettability between Al₂O₃ particles and molten steel,the It is difficult to realize the infiltration process without applied pressure.Therefore,this study aims to increase the atmospheric pressure infiltration depth of Al₂O₃ particle preforms with high manganese steel,so as to prepare Al₂O₃particle reinforced composites and improve the interface bonding ability.Lay the foundation.Based on the purpose of improving the infiltration ability of high manganese steel to Al₂O₃particle preforms,this article intends to prepare an interface reaction layer between Al₂O₃ particles and high manganese steel by sintering,which is the reaction of the high manganese steel solution with the interface during the infiltration process The layer reacts to achieve the purpose of increasing the infiltration depth and improving the interface bonding.By means of differential thermal analysis and Raman spectroscopy,the interaction of water glass adhesive with Al₂O₃particles during sintering was studied.Different ceramic fine powders were added to the interface reaction layer formed based on water glass to explore the pair of ceramic fine powders.The influence of the preform sintering process and the high manganese steel melt infiltration process.By designing the infiltration experiment,the effects of different sintering temperatures and the addition of different ceramic powders on the infiltration depth were analyzed,and the mechanism of the effects of different sintering temperatures and different types of ceramic powders on the preform preparation process and infiltration process was explored.So as to achieve the purpose of greatly increasing the depth of infiltration and improving the interface bonding.By means of differential thermal analysis,the effect of water glass and Al₂O₃ particles before and after sintering of the preform was observed,and 800?was selected as the sintering temperature of the preform.Combined with the analysis of X-ray diffraction and Raman spectroscopy,the changes of Al₂O₃ particle preform during sintering process were analyzed.The results showed that during the preparation of preform,the water glass solution formed a liquid film evenly wrapped around Al₂O₃ ceramic particles.In the subsequent drying and sintering process,an effective bonding effect is formed on the Al₂O₃ particles.After sintering to 800?,Al₂O₃interacts with the surface water glass to form a Na₂O-Al₂O₃-Si O₂ glass-ceramic phase.Carbide and oxide ceramic fine powders were selected to add to the interface reaction layer,and the effects of different ceramic fine powder addition on the phase composition of the interface reaction layer and the infiltration of high manganese steel were explored.The results show that the presence of oxides will lower the melting point of the ternary eutectic reaction between Na₂O,Si O₂ and Al₂O₃,so that the degree of glass transition on the Al₂O₃ surface will increase and the viscosity will decrease.When the preform with the addition of carbide ceramics was sintered to800°C,a Na₂O-Al₂O₃-Si O₂ microcrystalline phase was produced.The content of Al element in the generated microcrystalline phase is different from the preform to which Si C particles are added.Through the element analysis and theoretical derivation of the interface reaction layer of the infiltration depth experiment,the infiltration mechanism of high manganese steel to the preform was discussed.The results showed that the Al₂O₃ particle preform sintered at 800?and the high manganese steel melt impregnated it The penetration depth is 2.6 mm.For the preforms added with carbide ceramic powder,the penetration depth is further increased to a maximum of more than 12.5 mm.For the Al₂O₃ particle preform,the infiltration of high manganese steel is dominated by the interaction between the high manganese steel and the interface reaction layer.Oxide ceramics can improve the glass degree of the interface reaction layer and interact with Al₂O₃particles and Fe elements.The role of carbide is to promote the generation of microcrystalline phase in the interface reaction layer during sintering process,and change the content of Al element in the microcrystalline phase.The infiltration of high-manganese steel and the interface reaction layer is affected by two factors:the degree of glass grid connection and the element distribution of the interface reaction layer.The lower the degree of glass grid connection,the easier the infiltration;the microcrystalline phase in the interface reaction layer appears The reduction of the Al element content in the microcrystalline phase is conducive to the inward diffusion of the Mn element to increase the infiltration depth.In this paper,by sintering the preform and adding ceramic powder,it provides ideas for improving the infiltration capacity between high manganese steel and Al₂O₃ particle preform,and enriches the theory of composite infiltration.It is the Al₂O₃/high manganese steel matrix composite material.Application provides theoretical basis and experimental basis.