三相Cu-30Ni-20Cr合金在纯氧气中氧化行为研究  

Studies on Oxidation of a Three-Phase Cu-30Ni-20Cr Alloy in Pure O_2

作　　者：沈莹[1] 曹中秋[1] 

机构地区：[1]沈阳师范大学化学与生命科学学院,辽宁沈阳110034

出　　处：《沈阳师范大学学报（自然科学版）》2006年第1期80-83,共4页Journal of Shenyang Normal University:Natural Science Edition

基　　金：辽宁省教育厅基金资助项目(202112022)

摘　　要：研究了Cu-30Ni-20Cr合金在700-900℃、0．1MPa纯氧气中氧化行为．结果表明：合金由三相组成，合金基体由富Cu贫Cr的α相组成，β相以网状物的形式分散在α相中，而γ相以孤立的较小颗粒形式出现，有些分散在口相中，有些则分散在α相中．合金的氧化动力学偏离抛物线规律，其瞬时抛物线速率常数随时间而降低，降低幅度大于相应的按抛物线规律变化幅度．合金内部形成了合金和氧化物共存的混合内氧化，β相周围被一薄的Cr2O3层包围，Cr2O3不断扩展，最终形成了网状连续的Cr2O3层，阻止了合金进一步氧化．The oxidation behavior of Cu-30Ni-20Cr alloy was studied at 700-900 ℃ in pure oxygen. Results show that the alloy is composed of a mixture of three phases, where the a phase with the largest copper and lowest chromium content forms the matrix and the β phase withan intermediate chromium content forms large islands and has a rather large volume fraction, while the γ phase richest in chromium forms isolated particles dispersed in the other two phases. The oxidation kinetics deviates from the parabolic rate law and its instantaneous rate decreases continuously with time more rapidly than required by the parabolic rate law. Cu-30Ni-20Cr alloy is able to fatal a continuous Cr2O3 layer within the alloy to prevent alloy from being oxidized further.

关 键 词：Cu—Ni—Cr合金 三相 高温氧化 

分 类 号：TG172.82[金属学及工艺—金属表面处理]