碳化钽颗粒原位增强铁基表面复合材料研究  

Research on TaC Particles Reinforced Iron Matrix Surface Gradient Composite Prepared by In-situ Technology

作　　者：薛培婧[1] 许云华[1] 钟黎声[1] 

机构地区：[1]西安建筑科技大学材料科学与工程学院,陕西西安710055

出　　处：《热加工工艺》2012年第6期60-63,共4页Hot Working Technology

基　　金：国家自然科学基金面上项目(50974101)

摘　　要：利用铸造-热处理工艺原位反应生成了碳化钽颗粒增强铁基表面梯度复合材料。应用DSC、SEM和XRD等检测手段对该复合材料的反应温度、宏观组织、微观组织、矿物组成和微观硬度进行了确定和分析,并分析了该复合材料的形成过程和机理。结果表明:在1160℃保温1 h原位生成了碳化钽颗粒增强铁基表面复合材料,其表面梯度大致分为三层,分别是碳化钽纳米层、碳化钽微米层及碳化钽分散层;显微硬度值达到灰口铸铁的5.5～7.0倍,最大值为2123 HV0.02。初步机理分析认为,钽与碳之间的原位反应过程经过了溶解-扩散-原位反应-再扩散的过程。TaC particles reinforced iron matrix surface gradient composite was prepared using the combined process of casting and heat treatment.The reaction temperature,macrostructure,mineral constituents and microhardness of the composite were analyzed by DSC,SEM and XRD.Its forming process and mechanism were also analyzed.The results show that the TaC particles reinforced iron matrix surface gradient composite is generated at 1160 ℃ for 1 h by in-situ.The surface gradient can be divided into three layers,nano-TaC layer,micron-TaC layer and TaC scattered layer,respectively.The microhardness is 5.5～7 times to gray iron,and maximum value is 2123 HV0.02.The mechanism analysis shows that the process includes dissolution-diffusion-in situ reaction-and then spread.

关 键 词：原位合成 金属基复合材料 碳化钽 

分 类 号：TB331[一般工业技术—材料科学与工程]