再生WC-Co复合粉及高耐磨性硬质合金涂层的制备

发布时间：2018-06-21 01:05

本文选题：再生WC-Co复合粉 + 硬质合金涂层　；参考：《中国有色金属学报》2015年12期

【摘要】：以WC-6Co废旧硬质合金块体和Co_3O_4粉末为原料,采用氧化-还原碳化法制备再生WC-12Co复合粉,将复合粉经过造粒和热处理制备再生热喷涂喂料,进而采用超音速火焰喷涂(HVOF)制备再生WC-Co硬质合金涂层,比较再生硬质合金涂层和商业购买热喷涂喂料制备涂层的显微组织、耐磨性及其机制。结果表明:当配碳量为16.70%(质量分数)时,再生复合粉的碳含量适中;制备的再生热喷涂喂料由WC和Co相组成,热喷喂料球形度好,粒径分布均匀,平均粒径为23μm;再生WC-12Co硬质合金涂层的结构致密,WC晶粒尺寸分布均匀。与商业化热喷涂粉制备涂层显微组织和性能相比,再生涂层的磨粒磨损性能明显优于商业喷涂粉制备涂层的,其根本原因是两者的磨损机制不同。
[Abstract]:The regenerated WC-12Co composite powder was prepared by oxidation-reduction carbonization method from WC-6Co waste cemented carbide block and Cos _ 3O _ s _ 4 powder. The composite powder was granulated and heat treated to prepare regenerated hot spraying feedstock. Furthermore, the microstructure, wear resistance and mechanism of regenerated WC-Co cemented carbide coatings were compared with those prepared by commercial hot spraying and reclaimed WC-Co cemented carbide coatings prepared by hypersonic flame spraying (HVOF). The results show that the carbon content of the regenerated composite powder is moderate when the carbon content is 16.70%, the prepared regenerated hot spray feedstock is composed of WC and Co phase, the hot spray feed has good globality and uniform particle size distribution. The average particle size is 23 渭 m, and the grain size distribution of WC-12Co cemented carbide coating is uniform. Compared with the microstructure and properties of the coatings prepared by commercial thermal spraying powder, the abrasive wear properties of the regenerated coatings are obviously superior to those of the coatings prepared by commercial spraying powder. The fundamental reason is that the wear mechanisms of the two coatings are different.
【作者单位】：北京工业大学材料科学与工程学院;
【基金】：国家高新技术研究发展计划主题项目(SQ2013AAJY3168) 国家自然科学基金资助项目(51174009) 北京市自然科学基金重点资助项目(2131001)
【分类号】：TG174.4

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