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Microstructure-property relations in WC-Co coatings sprayed from combinatorial Ni-plated and nanostructured powders

机译：从组合Ni镀和纳米结构粉末喷涂WC-CO涂层中的微观结构 - 性质关系

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摘要

In this study, we addressed the effects of Ni-plating and nanostructuring of WC-Co powders on the microstructure-property relations and WC decarburization of WC-Co composite coatings. By high velocity oxygen fuel (HVOF) spraying, the coating materials were produced from four different powders, referred to as microstructured WC-Co (mc-WC), nanostructured WC-Co (nc-WC), Ni-plated microstructured WC-Co (Ni/mcWC) and Ni-plated nanostructured WC-Co (Ni/nc-WC). We found that the coatings, deposited from Ni-free powders, undergo a high level of decarburization, thereby yielding W2C phase formation in brittle amorphous W-rich Co matrix that could be preferential site for crack propagation. On the contrary, the Ni-plating treatment could reduce the amount of decarburization of the coatings, resulting in the uniform distribution of WC phase in the W-depleted Co matrix. Consequently, we revealed the underlying mechanisms responsible for WC decarburization in the coatings, and further suggested that the coating deposited from Ni-plated and nanostructured powders exhibits a superior combination of hardness and fracture toughness as compared to other coatings.
机译：在该研究中，我们解决了WC-Co粉末的Ni镀锌和纳米结构对WC-Co复合涂层的微观结构 - 性能关系和WC脱碳的影响。通过高速氧气燃料（HVOF）喷涂，涂料由四种不同的粉末制成，称为微结构化WC-CO（MC-WC），纳米结构WC-CO（NC-WC），Ni镀膜微结构WC-Co （Ni / MCWC）和Ni镀纳米结构WC-CO（Ni / NC-WC）。我们发现，从无Ni-Fe粉末沉积的涂层经历高水平的脱碳，从而在脆性无定形W-富含CO基质中产生W2C相形成，这可能是用于裂纹繁殖的优先态位点。相反，Ni镀处理可以减少涂层的脱碳量，导致W-耗尽的Co基质中WC相的均匀分布。因此，我们揭示了负责涂层中WC脱碳的潜在机制，并进一步提出，与其他涂层相比，从Ni镀和纳米结构粉末沉积的涂层表现出硬度和断裂韧性的优异组合。

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