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激光熔覆Ta-W合金組織及高溫氣動燒蝕性能
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國家自然科學基金（10832011）


Microstructure and High Temperature Aerodynamic Ablation Property of Ta-W Alloy Deposited by Coaxial Laser Cladding
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    摘要:

    以純W粉末為熔覆材料，純Ta為基底，采用同軸送粉激光熔覆技術在Ta板側面制備了Ta-W合金涂層。利用掃描電鏡（SEM）、能譜（EDS）及顯微硬度計對熔覆層的微觀組織和顯微硬度進行了分析，在直聯(lián)式自由射流風洞試驗臺上對涂層的抗高溫高速氣流燒蝕性能進行了測試。結果表明，熔覆層與基底冶金結合，涂層內部為致密的樹枝狀Ta-W合金固溶體，大致均勻地分布于Ta中。Ta-W合金涂層平均HV硬度8 GPa，為基材的5倍，同時抗燒蝕性能得到了顯著提高。

    Abstract:

    A Ta-W alloy coating was deposited on pure Ta plate by coaxial laser cladding, using tungsten powder as cladding material. The microstructure of the coating was analyzed by scanning electron microscopy (SEM) and energy disperse spectroscopy (EDS). The microhardness was examined by hardness tester. The high temperature hypersonic flow ablation property was tested in the wind tunnel system. It is found that the coating is metallurgically bonded with the substrate. The clad layer has a microstructure consisting of dendrite Ta-W solid solution uniformly dispersed in the Ta matrix. The average microhardness of the clad layer is approximately 8 GPa and it is 5 times greater than that of the Ta substrate. The ablative property is also obviously improved.

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武 揚,虞 鋼,何秀麗,寧偉健.激光熔覆Ta-W合金組織及高溫氣動燒蝕性能[J].稀有金屬材料與工程,2012,41(7):1211~1215.[Wu Yang, Yu Gang, He Xiuli, Ning Weijian. Microstructure and High Temperature Aerodynamic Ablation Property of Ta-W Alloy Deposited by Coaxial Laser Cladding[J]. Rare Metal Materials and Engineering,2012,41(7):1211~1215.]
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  • 收稿日期:2011-07-27
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