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首页> 外文会议>Asian Thermal Spray Conference >Microstructure and Bond Strength of Flattened Millimeter-size Nickel Droplet to Stainless Steel Substrate
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Microstructure and Bond Strength of Flattened Millimeter-size Nickel Droplet to Stainless Steel Substrate

机译：扁平毫米尺寸镍液滴到不锈钢基材的微观结构和粘合强度

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摘要

The thermal spray coating is formed by the accumulation of large amount of flattened droplet. In this work, a millimeter-size nickel metal droplet fell freely and impacted on metal substrate, in order to simulate the formation of individual thermally sprayed splat. The effect of substrate temperature and droplet velocity on the microstructure and the bond strength of the splat were particularly studied. The phenomenon of substrate melting was observed after the spreading of large nickel droplet, which became more pronounced when the initial substrate temperature was increased. Meanwhile, the grain size of the splat was decreased and the bond strength was improved. Increasing the droplet impact velocity resulted in a decrease in the interfacial temperature between droplet and substrate, and the bond strength was therefore decreased. The interfacial heat transfer coefficient, substrate temperature, and droplet temperature are the most important factors influencing the metallurgical bonding formed at the interface.
机译：通过大量扁平液滴的积累形成热喷涂涂层。在这项工作中，一颗毫米尺寸的镍金属液滴自由落下并撞击金属基板，以模拟各个热喷涂的夹持的形成。特别研究了衬底温度和液滴速度对微结构的影响和平分的粘合强度。在大镍液滴扩散后观察到衬底熔化现象，当初始衬底温度增加时变得更加明显。同时，降低了平均晶粒尺寸，改善了粘合强度。增加液滴冲击速度导致液滴和衬底之间的界面温度的降低，因此降低了粘合强度。界面传热系数，衬底温度和液滴温度是影响在界面处形成的冶金粘合的最重要因素。

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