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首页> 外文期刊>Surface & Coatings Technology >Effect of Ti on microstructure characteristics, carbide precipitation mechanism and tribological behavior of different WC types reinforced Ni-based gradient coating
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Effect of Ti on microstructure characteristics, carbide precipitation mechanism and tribological behavior of different WC types reinforced Ni-based gradient coating

机译：Ti对不同WC型梯度涂层不同WC型梯度涂层不同WC型梯度涂层的微观结构特征，碳化物沉淀机理及摩擦学行为的影响

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摘要

In this paper, Ti on different WC types (spherical WC and cast WC/W2C) reinforced Ni-based gradient coating was prepared via plasma transferred arc (PTA). Microstructure characteristics, carbide precipitation mechanism, gradient delamination and tribological behavior of the coating were discussed in detail. The relationships between Gibbs free energy, standard molar heat formation and dynamic viscosity of the molten pool were established. Results showed that two types of in-situ carbides formed at the top of the spherical WC reinforced Ni-based coating: one was core-shell structure particles with TiC as core and (Ti,W)C as shell, and another was octahedral particles of (Ti,W)C. Effect of Ti content on the delamination behavior of cast WC/W2C was greater than that of spherical WC. When the Ti content increased, the percentage of cast WC/W2C particles reduced sharply which was related to the severe dissolution behavior of the cast WC/W2C and the lower dynamic viscosity of the molten pool, but the spherical WC particles was basically unaffected. In the study of these four gradient coatings, Ti content strongly effected the microhardness and wear resistance of the cast WC/W2C and spherical WC reinforced Ni-based coatings.
机译：在本文中，通过等离子体转移弧（PTA）制备不同WC型（球形WC和铸造W2C）增强Ni的梯度涂层的Ti。详细讨论了微观结构特征，碳化物沉淀机理，涂层的梯度分层和摩擦学行为。建立了Gibbs自由能，标准摩尔热形成和熔池的动态粘度之间的关系。结果表明，两种类型的原位碳化物在球形WC增强的Ni涂层顶部形成：一种是核 - 壳结构颗粒，其作为核心和（Ti，W）C作为壳，另一个是八面体颗粒（ti，w）c。 Ti含量对铸造WC / W2C的分层行为的影响大于球面WC的分层行为。当Ti含量增加时，铸造WC / W2C颗粒的百分比急剧下降，其与铸造WC / W2C的严重溶解行为有关，并且熔池的较低动态粘度，但球形WC颗粒基本上不受影响。在这四种梯度涂层的研究中，Ti含量强烈影响铸造WC / W2C和球形WC增强Ni基涂层的显微硬度和耐磨性。

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