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鉑改性鋁化物涂層的熱生長層內(nèi)應(yīng)力研究
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TGO Stress Growth for Pt-Modified Aluminide Bond Coats during High Temperature Oxidation
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    摘要:

    研究了鎳基高溫合金熱障涂層系統(tǒng)中鉑改性鋁化物粘結(jié)層在空氣中非連續(xù)高溫氧化生成的Al2O3層內(nèi)應(yīng)力狀態(tài)及相應(yīng)的粘結(jié)層微觀結(jié)構(gòu)。利用Raman光激發(fā)熒光譜技術(shù)，發(fā)現(xiàn)鉑鋁粘結(jié)層在900 ℃氧化初期生成了θ-和α-Al2O3，而在1100 ℃氧化時，表面則形成連續(xù)致密的α-Al2O3層。通過α-Al2O3的光激發(fā)熒光譜偏移量，計算得到了熱障涂層中熱生長層的內(nèi)壓應(yīng)力略高于3.0 GPa。鉑改性鋁化物涂層表面Al2O3“背脊”處的內(nèi)應(yīng)力相對較低，同時由于沒有陶瓷層的壓制，生成的Al2O3起伏較大，并發(fā)生局部的Al2O3脫落。隨氧化時間延長，由于Al元素沿晶界擴散較快，導(dǎo)致更多的γ′-Ni3Al在粘結(jié)層晶界處形成，粘結(jié)層中基本相β-NiAl向γ′-Ni3Al轉(zhuǎn)變，改變了粘結(jié)層本身的熱膨脹系數(shù)，引起熱生長層中內(nèi)應(yīng)力變化

    Abstract:

    Microstructure and compressive stress in thermal growth oxide (TGO) of Pt-modified aluminide coating on nickel base superalloy CSMX4 for thermal barrier coating (TBC) application after discontinuous oxidation at high temperature in air have been studied. Using a micro Raman instrument technology, photo-stimulated-luminescence-spectra (PSLS) of θ- and α-Al2O3 formation are obtained for Pt-modified aluminide coating after 20 h oxidation exposure at 900 °C in air; however, a compact and protective α-Al2O3 layer is formed over the coating at 1100 °C in air. Thermal growth stress in α-Al2O3 was calculated according to the spectra shift compared with stress-free alumina spectra, a little higher than 3.0 GPa for TGO in TBC system after oxidation exposure. The stress within “ridges” of alumina surface over the coating is lower due to cracks’ formation during high temperature oxidation. Alumina rumpling is obvious for Pt-modified aluminide coating due to absence of ceramic layer. At the same time, Al element’s quick diffusion along substrate grain boundary results in more γ′-Ni3Al phase formed along boundary during oxidation. Coefficient of thermal expansion for the coating is changed with phase transformation from β-NiAl to γ′-Ni3Al, and finally affects the stress in TGO and coating lifetime during high temperature oxidation.

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張德豐,陸建生,宋 鵬,呂建國.鉑改性鋁化物涂層的熱生長層內(nèi)應(yīng)力研究[J].稀有金屬材料與工程,2011,40(11):1956~1960.[Zhang Defeng, Lu Jiansheng, Song Peng, Lü Jianguo. TGO Stress Growth for Pt-Modified Aluminide Bond Coats during High Temperature Oxidation[J]. Rare Metal Materials and Engineering,2011,40(11):1956~1960.]
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  • 收稿日期:2010-11-22
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