Study on the effect of Nb coating on the interface reaction of boron carbide-stainless steel composite materials
To address interfacial reaction issues in boron carbide-stainless steel composite materials during sinter-ing temperatures,this study employed the magnetron sputtering method to deposit a niobium coating on the sur-face of boron carbide microspheres. Subsequently,a composite material with boron carbide dispersed in stainless steel was prepared by Spark Plasma Sintering (SPS) at temperatures ranging from 900-1 100 ℃ using Nb-coated boron carbide microspheres and stainless steel powder as raw materials. Scanning electron microscopy (SEM)was used to analyze the surface morphology of the niobium-coated boron carbide microspheres and the micro-structure of the interfacial reaction layers between the boron carbide and stainless steel. The influence of the nio-bium coating on the interfacial reaction layer of the composite material was investigated. The results show that a niobium coating with a thickness of 0.5 micrometers is successfully deposited on the surface of the boron carbide microspheres. The niobium layer exhibits a blocking effect on the interfacial reaction between boron carbide and stainless steel. Under the same sintering conditions,the thickness of the reaction layer in the composites prepared using the Nb-coated boron carbide microspheres is significantly reduced. During the sintering process,mutual dif-fusion occurrs between the boron carbide and stainless steel,resulting in the formation of two reaction layers lo-cated on both sides of the niobium layer. Additionally,Kirkendall voids are observed to form on the outer side of the niobium layer.
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