自蔓延法制备铜铬合金  

Preparation of CuCr Alloy by Self-Propagating High-Temperature Synthesis

作　　者：豆志河[1] 张廷安[1] 牛丽萍[1] 赫冀成[1] 

机构地区：[1]东北大学多金属共生矿生态化利用教育部重点实验室,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2009年第10期1462-1465,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50374026;50644016;50874027);国家重点基础研究发展规划项目(2007CB613504)

摘　　要：考察了添加剂CaF2及铸模预热温度等因素对自蔓延反应过程及合金性能的影响,分析了铜铬合金的金相组织及其化学成分,采用XRD技术对铜铬合金和熔炼渣进行了表征.结果表明:自蔓延法合成的铜铬合金存在着富铜区、富铬区;合金由Cu,Cr两相组成,未形成新的共溶相;熔炼渣主要由Al2O3相组成;添加CaF2及提高铸模预热温度能够强化金渣分离效果,强制水冷能有效抑制合金的宏观偏析;当添加10%CaF2,铸模预热温度为500℃时,强制水冷条件下制备铜铬合金成分均匀、结构致密.The effects of the additive CaF2 and preheating temperature of mold on the SHS reaction by which the CuCr alloy was prepared and its properties were investigated. The metallographic structure of CuCr alloy and its chemical composition were analyzed, with the CuCr alloy and slag characterized by XRD. Experimental results indicated that the alloy consists of both Cu-rich and Cr-rich zones, and no new eutectic phase was found though there are Cu and Cr phases. The slag mainly consists of Al2O3, and the additive CaF2 and high preheating temperature can improve the efficiency of separating metal from slag. The forced water cooling can constrain efficiently the macrosegregation. When the ratio of the additive CaF2 is 10wt% and the preheating temperature is 500 ℃ with forced water cooling, the homogeneous and compact CuCr alloy can be prepared.

关 键 词：自蔓延高温合成 铜铬合金 强制水冷 偏析 预热温度 

分 类 号：TF132.5[冶金工程—冶金物理化学]