摘要
为了解决碳化硼不锈钢复合材料在烧结温度下的界面反应问题,采用磁控溅射方法在碳化硼微球表面制备铌涂层,再以涂铌碳化硼微球、304不锈钢粉末为原料,采用SPS烧结方法在900～1 100 ℃下烧结,制得碳化硼弥散在不锈钢基体中的复合材料,采用扫描电镜对涂铌碳化硼微球的表面形貌、碳化硼与不锈钢界面反应层进行分析,研究了铌涂层对复合材料界面反应层的影响.结果表明:用磁控溅射方法在碳化硼微球表面制备出了厚度为0.5 μm的金属铌涂层,铌层对碳化硼与不锈钢界面反应有阻止作用,在相同的烧结制度下,以涂铌碳化硼微球为原材料制得的碳化硼不锈钢复合材料界面反应层厚度明显降低,在材料烧结时,碳化硼与不锈钢各组元发生相互扩散,形成两层反应层,分别位于铌层两侧,并在外侧形成柯肯达尔孔洞.
Abstract
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.
基金项目
中核集团基础研究基金资助项目(Z3012023001)
NETL
NSTL
万方数据