K38G合金表面铬铝涂层的抗高温氧化性能  

High temperature oxidation resistance of Cr-Al thermal diffusion coatings on K38G superalloy

作　　者：朱明[1] 王明静[1] 杨超[2] 

机构地区：[1]西安科技大学材料科学与工程学院,陕西西安710054 [2]西安科技大学化学与化工学院,陕西西安710054

出　　处：《材料热处理学报》2014年第3期172-176,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51201131);陕西省科技新星项目(2013KJXX-42)

摘　　要：为提高镍基高温合金抗高温氧化性能,采用两步法制备了内扩散型铬铝涂层与单一渗铝涂层。当保温时间9 h、渗铬温度为1080℃、渗铬剂配比为:Cr粉含量为30%、NH4Cl含量为1%、Al2O3含量为69%;渗铝保温时间15 h、温度为750℃、渗铝剂配比为:Al粉含量为10%、NH4Cl含量为1.5%、Al2O3含量为88.5%;热处理保温时间为15 h、温度为800℃时可以得到期望的内扩散型β-NiAl和γ'-NiAl相,涂层组织均匀致密,可显著提高镍基高温合金基体在1100℃的抗高温氧化性能。Aiming to improve high temperature oxidation resistance of Ni based superalloy, inner diffusion Cr-A1 coatings and A1 coatings were prepared by composite processes, which were composed of diffusion chromizing and diffusion aluminizing at high temperatures. The optimized processes are diffusion chromizing at 1080 22 for 9 h using the diffusion reagent of 1% NH4C1, 69% Al2O3 and 30% Cr, and then diffusion aluminzing at 750 22 for 9 h using the diffusion reagent of 1.5% NH4C1, 88.5% Al2O3 and 10% A1. After heat treatment at 800 22 for 15 h, compact and homogenous inner diffusion Cr-A1 coatings consisted of β-NiA1 and γ＇-NiA1 are fabricated. The inner diffusion Cr-AI coatings can improve the high temperature oxidation resistance of Ni base superalloy at 1100 ℃.

关 键 词：高温氧化性能 内扩散型铬铝涂层 镍基高温合金 

分 类 号：TG174.44[金属学及工艺—金属表面处理]