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高溫拉壓環(huán)境下DZ125高溫合金的熱障涂層失效
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TB34

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國家自然科學(xué)基金項目（50571005：50420130032）資助


Failure of TBCs on DZ125 Alloy under Tension-Compression Load and High Temperature
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    摘要:

    采用電子束物理氣相沉積法（EB-PVD）在定向凝固N(yùn)i基高溫合金DZ125基體上制備了NiCoCrAlY粘結(jié)層和YSZ陶瓷層，研究了高溫拉壓環(huán)境下熱障涂層的失效模式，并對其進(jìn)行了有限元分析。實驗結(jié)果表明，熱障涂層的失效與僅受熱載荷作用下的有很大不同，僅有熱載荷作用下的熱障涂層裂紋多萌生于熱氧化層（TGO）內(nèi)部，進(jìn)而擴(kuò)展引起熱障涂層的失效。而高溫拉壓試驗后熱障涂層體系存在兩種裂紋，分別萌生于TGO／粘結(jié)層界面和粘結(jié)層／擴(kuò)散層界面附近。有限元模擬結(jié)果顯示TGO／陶瓷層和TGO／粘結(jié)層處存在應(yīng)力狀態(tài)的轉(zhuǎn)變和應(yīng)力值的突變，徑向應(yīng)力的突變導(dǎo)致了界面分離現(xiàn)象的產(chǎn)生，而軸向應(yīng)力的突變加速了垂直于界面裂紋的擴(kuò)展，并導(dǎo)致了試樣的最終斷裂。

    Abstract:

    Tension-compression tests at high temperature were carried out on the specimens made of Ni based superalloys (DZ125 alloy) coated with bond coating (NiCoCrAlY) and zirconia ceramic coating by electron beam-physical vapor deposition(EB-PVD). Failure of the thermal barrier coatings (TBC) was investigated. The test results show that the failure of TBCs occurred from the initiation and expansion of fracture in TGO,differing from under thermal loading alone. There are two kinds of fracture cracks: initiating from the TGO/bond coat interface and the bond coat/diffusion coat,respectively,resulting in the failure of specimens at last. From the simulation results by finite element analysis (FE),it can be conclude that there are abrupt changes of stress state and value near the interfaces of TGO/TBC and TGO/bond coats. The abrupt change of radial stress would result in the failure of TBCs from the spallation of interface. The abrupt change of axial stress would accelerate the extension of the microcracks perpendicular to the interface,resulting in the rupture of specimens.

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溫順達(dá) 陳立強(qiáng) 宮聲凱 徐惠彬 彭徽.高溫拉壓環(huán)境下DZ125高溫合金的熱障涂層失效[J].稀有金屬材料與工程,2007,36(6):1012~1015.[Wen Shunda, Chen Liqiang, Gong Shengkai, Xu Huibin, Peng Hui. Failure of TBCs on DZ125 Alloy under Tension-Compression Load and High Temperature[J]. Rare Metal Materials and Engineering,2007,36(6):1012~1015.]
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  • 最后修改日期:2006-06-02
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