Coatings of WC/Co Prepared by a Shaped Charge Explosion
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摘要: 利用聚能装药爆炸喷涂技术在基板表面制备了WC/Co(Co的质量分数为10%)涂层，简述了聚能装药爆炸喷涂的技术工艺。利用X射线衍射仪、金相显微镜对经聚能装药爆炸喷涂得到的涂层进行表征、分析。实验结果显示，使用WC/CoC2O4·2H2O(21.7%，CoC2O4·2H2O质量分数)机械混合粉末制备的涂层比使用WC/Co(10%)机械混合粉末制备的涂层均匀致密，并且涂层氧化脱碳程度明显降低。随着WC/CoC2O4·2H2O(21.7%)机械混合粉末中气体分散剂含量的增加，经聚能装药爆炸喷涂技术制备的涂层孔隙率逐渐降低，涂层均匀，致密性逐渐增强。Abstract: The technology of preparing coatings using a shaped-charge explosion was briefly introduced and employed to produce coatings of WC/Co (10%, mass fraction of Co) on the surface of the charge's substrates.The properties of the coatings were analyzed and characterized by means of X-ray diffraction analysis and optical microscopy.The results indicate that the uniform and compact coatings prepared from the mechanically mixed powder of WC/CoC2O4·2H2O (21.7%, mass fraction of CoC2O4·2H2O) by a shaped-charge explosion are better than those prepared from the mechanically mixed powder of WC/Co (10%), and the degree of oxidation and decarburization of the coatings was also lower than that of the later.With the increase of the gas dispersant in the mechanically mixed powder of WC/CoC2O4·2H2O, the porosity of the coatings was gradually decreased whereas its uniformity and compactness were gradually strengthened.
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Key words:
- shaped-charge explosion /
- WC/Co coating /
- gas dispersing agent
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表 1 实验方案
Table 1. Experimental scheme
Experiment No. Powder mass ratio Mass fraction of gasdispersing agent Density of powder/(g/cm3) Substrate 1 90: 10 (WC: Co) 2.43 1 2 78.3: 21.7 (WC: CoC2O4·2H2O) 2.41 2 3 78.3: 21.7 (WC: CoC2O4·2H2O) 20%(RDX) 2.38 3 4 78.3: 21.7 (WC: CoC2O4·2H2O) 40%(RDX) 2.40 4 
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表 2 厚度测量结果
Table 2. Thickness measurement result
Experiment No. a/(mm) b/(mm) c/(mm) d/(mm) 2 0.18 0.17 0.16 0.12 3 0.14 0.14 0.12 0.12 4 0.11 0.12 0.12 0.11
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