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熱處理對鉭強化激光熔覆NiCrBSi涂層的影響
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上海市科學技術委員會應用技術開發(fā)專項資金資助（2010-110）；國家自然科學基金資助（50675136，50375096）


Influence of Heat Treatment on Laser Clad Ta Reinforced NiCrBSi Coating
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    摘要:

    通過在激光熔覆NiCrBSi涂層（Ni60）中添加鉭（Ta）元素來提高900 ℃熱處理后涂層的耐磨性。研究了900 ℃熱處理對激光熔覆NiCrBSi和鉭強化NiCrBSi復合涂層顯微組織、硬度以及耐磨性能的影響。利用帶能譜儀的掃描電鏡和衍射儀分析涂層的顯微組織和物相。通過盤-銷實驗評價涂層的耐磨性。結果表明：經(jīng)過900 ℃熱處理后涂層中的M7C3和M23C6發(fā)生了分解，鉭強化復合涂層和純NiCrBSi涂層中的硬度都有所下降，但由于復合涂層中原位生成的TaC未發(fā)生分解，使得其硬度和耐磨性都高于純NiCrBSi涂層。

    Abstract:

    Tantalum element was used to improve wear resistance of laser clad NiCrBSi coating (Ni60) heat treated at 900 °C. Microstructure, microhardness and wear resistance of the pure NiCrBSi and Ta reinforced NiCrBSi coatings were investigated. The coatings were analyzed by scanning electron microscope (SEM) with energy energy-dispersive spectrometer (EDS). The phase constitution was identified using X-ray diffraction (XRD) experiments. Dry sliding wear tests were carried out on a pin-on-disc tribometer to study wear behavior. The results show M7C3 and M23C6 carbides were decomposed after 900 °C heat treatment, which resulted in the decrease in the microhardness of the coatings. However, after the heat treatment, the Ta reinforced NiCrBSi composite coating had higher microhardness and wear resistance compared to pure NiCrBSi coating since in situ TaC particles in the composite coating were not decomposed due to its high thermal stability.

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余 廷,鄧琦林,姜兆華,董 剛,楊建國.熱處理對鉭強化激光熔覆NiCrBSi涂層的影響[J].稀有金屬材料與工程,2013,42(2):410~414.[Yu Ting, Deng Qilin, Jiang Zhaohua, Dong Gang, Yang Jianguo. Influence of Heat Treatment on Laser Clad Ta Reinforced NiCrBSi Coating[J]. Rare Metal Materials and Engineering,2013,42(2):410~414.]
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  • 收稿日期:2012-02-16
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