發(fā)布時(shí)間：2018-10-22 13:52

【摘要】：采用超音速火焰噴涂(HVOF)工藝制備了納米結(jié)構(gòu)、雙峰結(jié)構(gòu)和常規(guī)結(jié)構(gòu)3種WC-CoCr復(fù)合涂層。探討了不同WC粉末粒度對(duì)涂層沉積過(guò)程的脫碳行為、涂層微觀組織及力學(xué)性能的影響。結(jié)果表明:隨WC顆粒尺寸減小,涂層脫碳率增大,W_2C含量增加,孔隙率降低,涂層的顯微硬度和界面結(jié)合強(qiáng)度增大;但是納米結(jié)構(gòu)涂層中粘結(jié)相的非晶化現(xiàn)象嚴(yán)重,斷裂韌度顯著下降;雙峰結(jié)構(gòu)涂層因納米、亞微米WC顆粒的合理搭配和協(xié)同效應(yīng)表現(xiàn)出最好的斷裂韌性,同時(shí)兼具較高的顯微硬度和界面結(jié)合強(qiáng)度。
[Abstract]:Three kinds of WC-CoCr composite coatings, nanostructure, bimodal structure and conventional structure, were prepared by supersonic flame spraying (HVOF) process. The effects of different particle sizes of WC powder on the decarburization behavior, microstructure and mechanical properties of the coating were investigated. The results show that with the decrease of WC particle size, the decarburization rate increases, the WSCC content increases, the porosity decreases, the microhardness and the interface bonding strength increase, but the amorphous phase in the nanostructured coating increases. The bimodal structure coating shows the best fracture toughness due to the reasonable collocation and synergistic effect of nanometers and submicron WC particles as well as high microhardness and interfacial bonding strength.
【作者單位】： 北京科技大學(xué)材料科學(xué)與工程學(xué)院;北京礦冶研究總院北礦新材科技有限公司;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51001117) 北京礦冶研究總院產(chǎn)品開發(fā)基金項(xiàng)目(YJZ201404)
【分類號(hào)】：TG174.4
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本文編號(hào)：2287332