PtAl<sub>2</sub>单相涂层的高温抗氧化性能及失效机制研究

doi:10.11900/0412.1961.2014.00064

金属学报

2014, Vol. 50

Issue (9): 1102-1108 DOI: 10.11900/0412.1961.2014.00064

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PtAl₂单相涂层的高温抗氧化性能及失效机制研究

柳泉, 阳颖飞, 鲍泽斌(

), 朱圣龙, 王福会

中国科学院金属研究所金属腐蚀与防护国家重点实验室, 沈阳 110016

OXIDATION PROPERTY AND FAILURE MECHANISM OF A SINGLE PHASE PtAl₂ COATING

LIU Quan, YANG Yingfei, BAO Zebin(

), ZHU Shenglong, WANG Fuhui

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

引用本文:

柳泉, 阳颖飞, 鲍泽斌, 朱圣龙, 王福会. PtAl₂单相涂层的高温抗氧化性能及失效机制研究[J]. 金属学报, 2014, 50(9): 1102-1108.
Quan LIU, Yingfei YANG, Zebin BAO, Shenglong ZHU, Fuhui WANG. OXIDATION PROPERTY AND FAILURE MECHANISM OF A SINGLE PHASE PtAl₂ COATING[J]. Acta Metall Sin, 2014, 50(9): 1102-1108.

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摘要:

在镍基铸造高温合金K38G上采用脉冲电镀的方法沉积Pt镀层, 通过分步加热粉末包埋渗Al处理后, 获得表层为单相PtAl₂, 内层为β-NiAl的Pt-Al涂层. 分别对单相PtAl₂涂层进行1100 ℃静态氧化及循环氧化测试, 并分析涂层在2种氧化条件下的氧化行为及失效机制. 结果表明, 单相PtAl₂涂层表现出良好的抗静态氧化能力, 初期快速增重主要来自于θ-Al₂O₃的生成, 很快θ-Al₂O₃转变为α-Al₂O₃且增重趋于平缓. 但是, 单相PtAl₂涂层的抗循环氧化能力较差, 循环氧化过程中产生的热应力会导致部分区域PtAl₂层剥离或脱落, 继而引发涂层过早失效. 因此, 单相PtAl₂涂层不适用于高温负载服役环境, 其在循环氧化过程中的失效和退化主要来自于PtAl₂层剥落以及剥落区附近β-NiAl层Al元素的快速消耗.

关键词 ：镍基高温合金, Pt-Al涂层, 热重分析, 静态氧化, 循环氧化

Abstract：

Pt-modified aluminide coating has attracted great attention due to its advantage of the integrated property in resisting both high temperature oxidation and hot corrosion. By the presence of Pt, the spallation trend of the grown oxide scale and the detrimental effect of S can be restrained at a very low level. Besides, Pt could promote α-Al₂O₃ formation and stabilize β-NiAl phase. Thus Pt-modified aluminide (Pt-Al) coating has been widely used in some crucial applications requiring reliability and extended service life. There are mainly PtAl₂, β-(Ni, Pt)Al and γ/γ′-NiPtAl phases existing inside Pt-Al coating. In this work, a single phase PtAl₂ coating was prepared on a Ni-based K38G superalloy through pulse-electroplating of Pt and pack aluminization under stepped heating mode. At 1100 ℃ , the isothermal oxidation behavior of the single phase PtAl₂ coating was evaluated by thermogravimetric analysis (TGA). Cyclic oxidation test of the PtAl₂ coating was performed within a vertical muffle furnace at the same temperature. The results indicate that the singular PtAl₂ coating possesses quite good isothermal oxidation resistance. However, its resistance against cyclic oxidation is very poor. The cyclic stress induced by repeated heating and cooling has caused visible detachment of PtAl₂ coating layer, and the spallation of PtAl₂ in further would lead to a premature failure of the whole coating system. Partial spallation of PtAl₂ layer, including undesirable consumption of Al inside β-NiAl nearby the spallation acts the main reason responsible for the final failure. Accordingly, it is not appropriate to apply single phase PtAl₂ coating in the high temperature services involving stress and load. The degradation mechanism of the singular PtAl₂ coating is investigated by discussing the stress generated from cyclic heating and cooling.

Key words： Ni-based superalloy Pt-Al coating thermogravimetric analysis (TGA) isothermal oxidation cyclic oxidation

ZTFLH:

TG174.44

基金资助:* 国家自然科学基金项目51301184, 国家重点基础研究发展计划项目2012CB625100和国家高技术研究发展计划项目2012AA03A512资助

作者简介: null

柳泉, 男, 1981年生, 博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00064 或 https://www.ams.org.cn/CN/Y2014/V50/I9/1102

图1 K38G合金镀Pt及后续渗Al处理后的截面形貌

图2 K38G合金样品镀Pt及后续渗Al处理后的XRD谱

图3 PtAl2单相涂层1100 ℃氧化20 h后表面的XRD谱

图4 PtAl2单相涂层1100 ℃静态氧化20 h的增重曲线

图5 PtAl2单相涂层1100 ℃静态氧化20 h后截面形貌

图6 K38G合金及PtAl2单相涂层在1100 ℃循环氧化条件下的质量变化曲线

图7 K38G合金及PtAl2单相涂层在1100 ℃循环氧化200 cyc后的截面形貌

图8 PtAl2单相涂层在1100 ℃下循环氧化200 cyc后的截面形貌及对应的EDS扫描结果

图9 PtAl2单相涂层冷热交变循环过程中失效行为示意图

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