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NiCoCrAlYTa涂層/鎳基單晶高溫合金界面再結(jié)晶
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Recrystallization on Interface between NiCoCrAlYTa Coating and Nickel-Based Super-Alloy
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    摘要:

    采用低壓等離子噴涂技術(shù)在鎳基單晶高溫合金上制備了NiCoCrAlYTa涂層, 通過不同的真空熱處理和預(yù)處理制度研究其對(duì)涂層/鎳基單晶界面的影響。結(jié)果表明，1080 ℃真空熱處理界面擴(kuò)散帶均產(chǎn)生胞狀再結(jié)晶體，而1000 ℃和850 ℃無再結(jié)晶產(chǎn)生。預(yù)處理時(shí)噴砂壓力大于0.2 MPa，在1080 ℃, 6 h熱處理后再進(jìn)行850 ℃, 24 h時(shí)效處理界面擴(kuò)散帶均產(chǎn)生再結(jié)晶體，無噴砂時(shí)無再結(jié)晶產(chǎn)生。同時(shí)熱處理后界面處出現(xiàn)元素的相互擴(kuò)散及富Ta的Ni2Ta和Cr2Ta相，Ta在胞狀晶內(nèi)偏聚

    Abstract:

    The NiCoCrAlYTa coating was prepared on Ni-based single crystal super-alloys by low pressure plasma spraying (LPPS). The influences of heat treatment and pre-peening on the interface recrystallization of NiCoCrAlYTa coating and nickel-based super-alloy substrate were investigated by X-ray, SEM, BES and EPXMA. It was found that cellular recrystallization occurred at the diffusion area of samples adopting the vacuum heat treatment at the temperature of 1080 ℃, while no recrystallization appeared at the temperatures of 1000 ℃ and 850 ℃. Recrystallization was also observed in the sample subjected by pre-peening with more than 0.2 MPa, followed by 1080 ℃, 6 h heat treatment and 850 ℃, 24 h aging treatment, while no recrystallization was observed in the sample subjected by no pre-peening followed by above mentioned heat treatment. The results revealed that element Ta aggregated within cellular grains and that inter-diffusion took place and Ta-rich phases (Ni2Ta, Cr2Ta) were formed at the interface through heat treatment

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梁興華,周克崧,劉 敏,鄧暢光. NiCoCrAlYTa涂層/鎳基單晶高溫合金界面再結(jié)晶[J].稀有金屬材料與工程,2009,38(3):545~549.[Liang Xinghua, Zhou Kesong, Liu Min, Deng Changguang. Recrystallization on Interface between NiCoCrAlYTa Coating and Nickel-Based Super-Alloy[J]. Rare Metal Materials and Engineering,2009,38(3):545~549.]
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  • 收稿日期:2008-09-13
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