多元铝青铜气孔形成机理及消除措施  

The Formation Mechanism of Pinhole in Aluminum Bronze and Elimination Measures

作　　者：子澍[1] 

机构地区：[1]北京工业大学材料科学及工程学院,北京100022

出　　处：《铸造技术》2008年第8期1069-1071,共3页Foundry Technology

摘　　要：通过热力学计算及分析得出,高温铜液与环境中的水蒸气反应是铝青铜铸件形成气孔的主要原因,铜合金液中H、O含量之间呈广义双曲线函数关系。氢含量高则氧含量降低,反之亦然。据此,消除铜合金铸件针孔的工艺措施有两条途径:①在还原性气氛下进行熔炼。浇注前,炉内通入惰性气体除氢;②氧化性气氛下熔炼。浇注前,炉内用脱氧剂进行脱氧。Results of thermodynamic calculation and analysis show that the reaction between high temperature molten copper alloy and water vapor is the main reason of pinhole formation in aluminum bronze. H andO content of molten copper alloy has a relationship with the generalized hyperbolic curve. Two measures to eliminate pinhole of aluminum bronze are proposed： 1. Smelting is made under the reducing atmosphere, and inert gas is blown into furnace before pouring. 2. Smelting is made under the oxidizing atmosphere, and deoxidization is made utilizing deoxidizer before pouring.

关 键 词：铝青铜 针孔 

分 类 号：TG27[金属学及工艺—铸造]