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℃
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1 100℃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.
铝-硅涂层
元素扩散
氧化
DZ4 superalloy
Al-Si coating
element diffusion
oxidation
Abstract
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-riched M6C.Si-riched M6C layer prohibited Ni/Al inter-diffusion and promoted the coating resistance to high temperature oxidation.
中图分类号 TG174
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收稿日期 2007/5/14
修改稿日期 2007/6/30
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备注杨世伟(1950-),男,黑龙江佳木斯人,教授,博士生导师.
引用该论文: YANG Shi-wei,XIA De-gui,SUN Jie,ZHANG Zhi-ming,YANG Xiao. Element Diffusion of Al-Si Coating on Superalloy DZ4 at 1100℃[J]. Materials for mechancial engineering, 2008, 32(3): 5～7
杨世伟,夏德贵,孙杰,张志明,杨晓. DZ4合金渗铝-硅涂层1100℃氧化时的元素扩散规律[J]. 机械工程材料, 2008, 32(3): 5～7
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参考文献
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【3】韦华,管恒荣,孙晓峰,等.K465高温合金铝化物涂层Ni/Al互扩散系数计算[J].中国腐蚀与防护学报,2004,24(10):257-261.
【4】刘培生,梁开明,顾守仁.铝化物涂层高温氧化寿命的预测[J].清华大学学报,2006,43(6):766-768.
【5】谢辅洲.高温合金渗铝涂层抗高温氧化性能的研究[J].热加工工艺,2004,33(3):11-13.
【6】Nadia Vialas,Daniel Monceau.Effect of Pt and Al content on the long-term,high temperature oxidation behavior and interdiffusion of a Pt-modified aluminide coating deposited on Ni-base superalloys[J].Surface and Coatings Technology,2006,21(7):3846-3851.
【7】李铁藩.金属高温氧化和热腐蚀[M].北京:化学工业出版社,2003:291.
【8】黄粮,孙晓峰,管恒荣,等.定向凝固高温合金M951低压渗铝涂层的高温氧化及相变过程[J].腐蚀科学与防护技术,2005,17(1):34-38.
【9】Sailesh M,Michael R.A review:constitution of the Al-Cr-Ni system[J].Materials Science and Engineering,1984,66(1):47-60.
【10】Basuki E,Crosky A,Gleeson B.Interdiffusion behavior in aluminide-coated Rene 80H at 1 150℃[J].Materials Science and Engeering,1997,A224:27-32.
【11】郑运荣,张德堂.高温合金与钢的彩色金相研究[M].北京:国防工业出版社,1999:139.
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