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激光噴丸強(qiáng)化CoCrAlY防護(hù)涂層 抗高溫氧化性能研究
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江蘇大學(xué)

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中圖分類號:

TG174.4

基金項目:

國家自然科學(xué)基金-青年基金(批準(zhǔn)號:51601072)、江蘇省自然科學(xué)基金-青年基金（批準(zhǔn)號:BK20160530）、教育部三束材料改性重點實驗室開放基金(批準(zhǔn)號:KF1805)和江蘇省研究生實踐創(chuàng)新計劃項目（SJCX18_0740）資助的課題


High-Temperature Oxidation Resistance of CoCrAlY Protective Coating Strengthened by Laser Peening
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Jiangsu University

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Financial supports from the National Natural Science Foundation of China (No. 51601072)、the Jiangsu Province Natural Science Foundation for Youths (No. BK20160530)、the open project program of Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education (KF1805)、Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJCX18_0740)

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    摘要:

    利用大氣等離子噴涂(Air Plasma Spraying,APS)技術(shù)在鎳基高溫合金表面制備CoCrAlY涂層，在此基礎(chǔ)上采用電子束真空蒸鍍(Electric Beam Vacuum Deposition,EBVD)技術(shù)在涂層表面進(jìn)一步沉積鋁膜，以提高涂層表面Al元素含量。采用激光噴丸(Laser Peening,LP)技術(shù)分別對以上兩種涂層進(jìn)行強(qiáng)化處理。采用X射線衍射(X-Ray Diffraction,XRD)和掃描電子顯微鏡(Scanning Election Microscope,SEM)對比分析LP沖擊前后CoCrAlY涂層表面相結(jié)構(gòu)、微觀形貌及成分變化。微觀結(jié)構(gòu)分析表明，LP處理后APS-CoCrAlY涂層表面粗糙度降低，組織致密性增加；鍍鋁CoCrAlY涂層經(jīng)LP處理后，表面Al含量明顯增加，β-CoAl相含量提高，且涂層表面晶粒得到細(xì)化。1050 ℃抗高溫氧化實驗結(jié)果表明，LP處理涂層表面形成的氧化膜較原始涂層更加平整、致密，且氧化膜厚度明顯變薄；此外，鍍鋁CoCrAlY涂層經(jīng)LP處理后的抗高溫氧化性能最優(yōu)。

    Abstract:

    The CoCrAlY coating was deposited on the surface of the nickel-based superalloy by Air plasma spraying (APS). And on this basis, electron beam vacuum deposition (EBVD) method was used to deposit aluminum film on the coating surface in order to increase the Al content. The above two coatings were reinforced by laser peening (LP) technique. X-ray diffraction (XRD) and scanning election microscope (SEM) were used to compare the phase structure, morphology and composition of the CoCrAlY coating before and after LP treatment. The results of microstructural analysis showed that the surface roughness of APS-CoCrAlY coating was decreased, and the microstructure became more compact after LP treatment. The surface Al content of CoCrAlY coating deposited with Al film after LP impact was increased significantly, and the content of β-CoAl phase was increased. The grain size was refined concurrently. The results of high-temperature oxidation test at 1050 °C showed that the oxide film formed on the surface of LP treated coating became smoother and denser than that of the original one, and the thickness of the oxide film was significantly thinner. In addition, the aluminized CoCrAlY coating after LP treatment achieved optimal performance of high-temperature oxidation resistance.

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引用本文

李國君,蔡杰,高承鉆,李晨,關(guān)慶豐.激光噴丸強(qiáng)化CoCrAlY防護(hù)涂層 抗高溫氧化性能研究[J].稀有金屬材料與工程,2020,49(6):2132~2138.[liguojun, caijie, gaochengzuan, lichen, guanqingfeng. High-Temperature Oxidation Resistance of CoCrAlY Protective Coating Strengthened by Laser Peening[J]. Rare Metal Materials and Engineering,2020,49(6):2132~2138.]
DOI：10.12442/j. issn.1002-185X.20190407

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  • 收稿日期:2019-05-13
  • 最后修改日期:2019-06-24
  • 錄用日期:2019-07-02
  • 在線發(fā)布日期: 2020-07-09
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