Development of Copper Based Alloys Possessing High Strength and High Electrical Conductivity by Molten Metal Preferential Oxidation Method

熔融金属优先氧化法制备高强高导电性铜基合金是一种在高温条件下制备高强度高导电性分散硬化铜合金的新工艺。在该方法中，具有高氧化生成自由能的合金元素在熔融金属中被CO_2气体优先氧化。高强度和高导电性可以通过使消耗溶质元素生长的氧化物分散而获得。研究了铝含量、成分、吹气压力、吹气体积、吹气喷嘴形状和加热工艺对合金组织和性能的影响。在所有的测试条件下，气体吹塑都能提高材料的硬度和导电性。当气体体积达到理论上氧化所有溶质原子所需体积的几倍时，就得到了关于这两种性质的极好结果。结果表明，使用CO和CO_2混合气体可以达到较高的重现性，并且可以在不氧化铜溶剂的情况下氧化溶质元素。

Development of Copper Based Alloys Possessing High Strength and High Electrical Conductivity by Molten Metal Preferential Oxideation MethodThe molten metal preferential oxidation is a new process designed to produce a dispersion hardened copper alloy possessing high strength and high electrical conductivity at elevated temperatures. In this method, alloying elements having high oxide formation free energy are preferentially oxidized by the blowing of CO_2 gas in molten metals. High strength as well as high conductivity can be achieved by dispersing the oxides finely which grow by consuming the solute elements.The effects of the aluminium content, composition, pressure and volume of blown gas, the shape of the blowing nozzle and the heating process on the microstructure and property of this alloy were investigated. The increase in hardness and electrical conductivity by the gas blowing was found in all the testing conditions. Excellent results concerning these two properties were obtained when the gas volume is a few times as much as those required theoretically to oxidize all the solute atoms. It was suggested that the usage of the mixture of CO and CO_2 gases is better to achieve the high reproducibility and to oxidize the solute elements without the oxidation of copper solvent.