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主管单位 中华人民共和国
工业和信息化部
主办单位 中国材料研究学会
哈尔滨工业大学
主编 苑世剑 国际刊号ISSN 1005-0299 国内刊号CN 23-1345/TB

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引用本文:范丽,陈海龑,都海良,侯悦,程前,董丽华.感应等离子体技术制备球形铸造碳化钨粉体及其性能表征[J].材料科学与工艺,2020,28(6):56-66.DOI:10.11951/j.issn.1005-0299.20190063.
FAN Li,CHEN Haiyan,DU Hailiang,HOU Yue,CHENG Qian,DONG Lihua.Preparation and performance characterization of spherical cast tungsten carbide powder by induction plasma technology[J].Materials Science and Technology,2020,28(6):56-66.DOI:10.11951/j.issn.1005-0299.20190063.
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感应等离子体技术制备球形铸造碳化钨粉体及其性能表征
范丽1, 陈海龑2, 都海良1, 侯悦2, 程前2, 董丽华2
1.上海建桥学院 机电学院,上海 201306;2.上海海事大学 海洋科学与工程学院,上海 201306
摘要:
球形碳化钨增强金属基复合涂层具有高硬度、高韧性和优异的耐磨、耐蚀性等特点,可以对材料表面起到有效保护作用。传统铸造碳化钨粉体多呈不规则的片状或多角状,流动性差且硬度低,难以满足高性能涂层材料的要求。本文以多角状铸造碳化钨粉体为原料,采用感应等离子体技术制备球形碳化钨粉体,研究感应等离子体技术工艺参数对碳化钨粉体球化效果的影响规律。采用扫描电子显微镜、X射线衍射仪、霍尔流速计、激光粒度分析仪等对球化处理前后碳化钨粉体的形貌、物相、松装密度、粒度分布进行表征。结果表明:送粉率为110 g/min、载气流量为5.0 L/min时,采用感应等离子体技术可制备颗粒饱满、表面光滑、分散性良好,球化率高达99%以上,且球形度较好的球形碳化钨粉体。球化后碳化钨粉体无孔洞等缺陷,内部组织为典型的细针状WC和W2C的共晶,组织结构均匀细密。球化后碳化钨粉体的硬度高达3 258HV,提高了408HV;球化后碳化钨粉体的松装密度由8.01 g/cm3提高到9.75 g/cm3,霍尔流速由10.30 s/50 g降低到6.80 s/50 g,粉体的流动性提高。
关键词:  球形粉体  感应等离子体技术  铸造碳化钨  球化率  工艺参数
DOI:10.11951/j.issn.1005-0299.20190063
分类号:TF123.3
文献标识码:A
基金项目:国家自然科学基金资助项目(51609133);上海建桥学院科研项目(SJQ19012).
Preparation and performance characterization of spherical cast tungsten carbide powder by induction plasma technology
FAN Li1, CHEN Haiyan2, DU Hailiang1, HOU Yue2, CHENG Qian2, DONG Lihua2
1.College of Mechanical and Electronic Engineering, Shanghai Jian Qiao University, Shanghai 201306, China;2.College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
Abstract:
The spherical tungsten carbide reinforced metal matrix composite coating has high hardness, high toughness, excellent wear, and corrosion resistance, and can effectively protect the surface of the materials. The traditional cast tungsten carbide powders have irregularly flaky or polygonal shapes, and thus have poor fluidity and low hardness, which cannot meet the requirements of high-performance coating materials. Spherical tungsten carbide powders were prepared by induction plasma spheroidization using polygonal cast tungsten carbide powders as raw materials. The effect of processing parameters of induction plasma spheroidization on the spheroidizing effect of tungsten carbide powders was studied. The phase composition, morphologies, and particle size distributions of the powders before and after spheroidization were characterized by scanning electron microscopy, X-ray diffraction, Hall flow meter, and laser particle size analyzer. Optimized plasma spheroidizing parameters were 110 g/min powder feeding rate and 5 L/min carrier gas flow. The results show that the obtained tungsten carbide powders have smooth surface, excellent sphericity and dispersion, and high spheroidiztion rate of more than 99 % using these optimized parameters. The spheroidized tungsten carbide powders have no defects such as holes, and exhibit uniform structure of fine needle WC and W2C eeutectic. The microhardness of spheroidized tungsten carbide powder is 3 258HV, 408HV higher than that before spheroidization. The apparent density increases from 8.01 g/cm3 to 9.75 g/cm3, whereas Hall flow rate decreases from 10.30 s/50 g to 6.80 s/50 g, suggesting a better fluidity of the powders.
Key words:  spherical powder  plasma technology  cast tungsten carbide  spheroidization rate  process parameter

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