DZ4合金渗铝-硅涂层1100℃氧化时的元素扩散规律  

Element Diffusion of Al-Si Coating on Superalloy DZ4 at 1100 ℃

作　　者：杨世伟[1] 夏德贵[1] 孙杰[1] 张志明[1] 杨晓[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《机械工程材料》2008年第3期5-7,12,共4页Materials For Mechanical Engineering

摘　　要：以定向凝固镍基高温合金DZ4为基体,采用料浆法在合金表面制备铝-硅涂层;对该涂层试样进行1100℃抗高温氧化性能试验,并对氧化过程中各元素的分布进行了分析。结果表明:随氧化时间增加,涂层逐渐分为两层,外层为单一β-NiAl相,内层主要由β-NiAl相构成,层内分布着块状和颗粒状的碳化物;高温氧化过程中,硅元素不断向涂层内部扩散,并与基体合金中向外扩散的钼、钨元素结合形成富硅的M6C,并逐渐形成M6C隔层,阻碍镍与铝的互扩散,提高了涂层在高温下的抗氧化能力。The Al-Si coating on DZ4 superalloy was prepared by slurry process.High temperature oxidation experiments of Al-Si coating on DZ4 were carried out at 1 100 ℃ in air and element diffusion in the oxidation was analyzed.The results indicate that Al-Si coating is composed of two layers. The outer layer is a single phase β-NiAl,while inner layer consiste of β-NiAl and carbide precipitates.The combination of inward-diffusing of Si and outward-diffusing of elements(mainly Mo and W) leds to the formation of Si-rich...

关 键 词：DZ4高温合金 铝-硅涂层 元素扩散 氧化 

分 类 号：TG174.4[金属学及工艺—金属表面处理]