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首页> 外文期刊>Materials Science and Technology: MST: A publication of the Institute of Metals >Effect of solid carbide particle size on deposition behavior, microstructure and wear performance of HVOF cermet coatings
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Effect of solid carbide particle size on deposition behavior, microstructure and wear performance of HVOF cermet coatings

机译：固态碳化物粒度对HVOF金属陶瓷涂层的沉积行为，微观结构和磨损性能的影响

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摘要

The deposition process of WC - Co and Cr_3C_2 - NiCr cermet coatings through a high velocity oxyfuel (HVOF) spray process was examined using powders of different carbide particle sizes that ranged from 1-5 urn to over 15 mu m. The effect of carbide particle size on the thickness of flattened particles was investigated. The carbide size in the coating was compared to that in the original feedstock. Results showed that most of the carbide particles remained in a solid state after passing through the flame, and the deposition of the cermet coating involves lateral flattening of a solid - liquid two phase droplet rather than a single liquid droplet, as in plasma spraying of metallic and ceramic materials under optimised conditions. It was found that the size of carbide particles in a sprayed coating depends greatly on the corresponding carbide size in the starting powder. The large solid carbide particles in a two phase droplet tend to rebound easily during HVOF spraying when the droplet impacts on a substrate surface, while small carbide particles in the droplet may follow the flattening of the liquid binder phase and be easily retained in thedeposit. Using a powder consisting of small carbide particles leads to substantial retention of carbide particles in thecoating and consequently an improved wear performance. A model is proposed to explain the effect of carbide particle size on the splat formation by a solid-liquid two phase droplet.
机译：使用1-5微米至15微米以上的不同碳化物粒度的粉末，检查了通过高速氧燃料（HVOF）喷涂工艺沉积的WC-Co和Cr_3C_2-NiCr金属陶瓷涂层的沉积过程。研究了碳化物粒度对扁平颗粒厚度的影响。将涂层中的碳化物尺寸与原始原料中的尺寸进行比较。结果表明，大多数碳化物颗粒在穿过火焰后仍保持固态，而金属陶瓷涂层的沉积涉及到固-液两相液滴而不是单个液滴的横向展平，如金属的等离子喷涂和陶瓷材料在优化条件下。已发现喷涂涂层中碳化物颗粒的尺寸很大程度上取决于起始粉末中相应的碳化物尺寸。当液滴撞击基材表面时，两相液滴中的大固体碳化物颗粒在HVOF喷涂过程中趋于容易反弹，而液滴中的小碳化物颗粒可能跟随液态粘合剂相的变平并易于保留在沉积物中。使用由小的碳化物颗粒组成的粉末导致碳化物颗粒基本保留在涂层中，因此改善了磨损性能。提出了一个模型来解释碳化物粒度对固液两相液滴对飞溅形成的影响。

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