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具備Al2O3原位合成特性的WC復(fù)合粉末設(shè)計(jì)與涂層
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河南科技大學(xué),天津大學(xué),天津大學(xué),天津大學(xué),天津大學(xué)

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國家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目）


Design of WC Composite Powders and Coatings with Characteristic of in-situ Synthesis Al2O3
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Henan University of Science and Technology,Tianjin University,Tianjin University,Tianjin University,Tianjin University

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    摘要:

    利用球磨法將Al粉添加到亞微米結(jié)構(gòu)WC-12Co粉末中，設(shè)計(jì)并制備了具有Al2O3原位合成特性的納米結(jié)構(gòu)WC-Co-Al粉末。XRD分析顯示球磨10h、30h和50h后的粉末中WC平均晶粒尺寸為93.1nm、39.0nm和44.8nm。超音速火焰（HVOF）噴涂時，WC-Co-Al粉末比球磨前WC-12Co粉末扁平化更好，涂層孔隙率為0.57%，比WC-12Co涂層（1.62%）更低。粉末中的Al元素與氧氣反應(yīng)原位生成了Al2O3硬質(zhì)陶瓷顆粒，有效抑制了WC的氧化脫碳。WC-Co-Al涂層顯微硬度為1298?3HV0.1，比WC-12Co涂層高出約36%，這得益于Al2O3顆粒的增強(qiáng)效應(yīng)，WC晶粒納米化和孔隙率降低。

    Abstract:

    Nanostructured WC-Co-Al powders with characteristic of in-situ synthesis Al2O3 were synthesized from submicron structured WC-12Co powder and Al powder using ball-milling method. XRD analysis showed that the average size of WC grains was 93.1nm, 39.0nm and 44.8nm after milling 10h, 30h and 50h, respectively. When sprayed by high velocity oxygen fuel (HVOF) thermal spraying, WC-Co-Al powders were more easily flattened than WC-12Co powder without ball-milling. The porosity of WC-Co-Al coating was only 0.57% which was much lower than that of WC-12Co coating with a value of 1.62%. During spraying Al reacted with oxygen, which effectively inhibited the decarburization of WC, and Al2O3 hard ceramic particles were in situ generated in coatings. The microhardness of WC-Co-Al coating was 1298?3HV0.1, higher about 36% than that of WC-12Co coating, which mainly benefitted by the enhancement effect of Al2O3 particles, nanocrystallization of WC phase and lower porosity.

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馬寧,烏煥濤,陸冠雄,郭磊,葉福興.具備Al2O3原位合成特性的WC復(fù)合粉末設(shè)計(jì)與涂層[J].稀有金屬材料與工程,2016,45(4):1012~1017.[Ma Ning, Wu Huantao, Lu Guanxiong, Guo Lei, Ye Fuxing. Design of WC Composite Powders and Coatings with Characteristic of in-situ Synthesis Al2O3[J]. Rare Metal Materials and Engineering,2016,45(4):1012~1017.]
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  • 收稿日期:2014-04-30
  • 最后修改日期:2014-05-28
  • 錄用日期:2014-07-01
  • 在線發(fā)布日期: 2016-06-02
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