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BT20鈦合金表面電火花沉積WC涂層微觀組織研究
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大連工業(yè)大學(xué)青年基金項(xiàng)目（QNJJ201204）


Microstructure of Electro-Spark Deposition WC Coating on BT20 Titanium Alloy
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    摘要:

    以WC為電極，氬氣為保護(hù)氣，采用電火花沉積方法在BT20鈦合金基體上制備了強(qiáng)化沉積層。利用SEM、EDS和XRD分析了沉積層的微觀結(jié)構(gòu)和物相, 利用顯微硬度計(jì)測(cè)試了沉積層截面的顯微硬度。結(jié)果表明，沉積層主要由TiC、WC、W和W2C相組成，TiC是電極材料與基體材料反應(yīng)形成新相，是沉積層的主要組成相；沉積層與基體結(jié)合致密，形成良好的冶金結(jié)合。沉積層表面呈“潑濺狀”形貌，截面組織形貌中觀察到納米級(jí)微晶堆垛結(jié)構(gòu)和少量的樹枝晶，反映了電火花沉積過(guò)程的快速加熱和冷凝機(jī)制。沉積層顯微硬度呈梯度變化，涂層最大硬度是基體的3倍。

    Abstract:

    The WC coating was produced on the surface of BT20 titanium alloy in Ar atmosphere by electro-spark deposition technique using WC as electrode. The microstructures and the phase compositions of WC coatings were characterized by SEM，EDS and XRD. The microhardness distribution of the deposition coating was studied by microhardness tester. The results show that the coating consists of TiC, WC, W and W2C phases. TiC is a new phase formed by the reaction between the electrode material and the substrate which is the main phase of the deposited layer. The excellent metallurgical bonding between the coating and the substrate is obtained. The coating surface displays a "splash" shape. The nanometer crystallite stacking structure and a small amount of dendritic structure can be observed in the cross section morphology which reflects the electric spark deposition process for rapid heating and the cooling mechanism. The maximum microhardness of the coating is three times of that of the substrate.

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王明偉,潘 仁,李 姝,趙秀君,朱 志,張立文. BT20鈦合金表面電火花沉積WC涂層微觀組織研究[J].稀有金屬材料與工程,2014,43(2):361~363.[Wang Mingwei, Pan Ren, Li Shu, Zhao Xiujun, Zhu Zhi, Zhang Liwen. Microstructure of Electro-Spark Deposition WC Coating on BT20 Titanium Alloy[J]. Rare Metal Materials and Engineering,2014,43(2):361~363.]
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  • 收稿日期:2013-01-15
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  • 在線發(fā)布日期: 2014-06-03
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