EFFECT OF GAS TEMPERATURE ON DEFORMATION AND DEPOSITION BEHAVIORS OF COLD-SPRAYED Ni PARTICLES

Acta Metall Sin

2007, Vol. 43

Issue (8): 823-828 DOI:

Research Articles

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EFFECT OF GAS TEMPERATURE ON DEFORMATION AND DEPOSITION BEHAVIORS OF COLD-SPRAYED Ni PARTICLES

ZHANG Hua-Bing;

上海交通大学宝钢研究院前沿技术研究所

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ZHANG Hua-Bing. EFFECT OF GAS TEMPERATURE ON DEFORMATION AND DEPOSITION BEHAVIORS OF COLD-SPRAYED Ni PARTICLES. Acta Metall Sin, 2007, 43(8): 823-828 .

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Abstract The deformation and the deposition morphologies of cold-sprayed Ni particles impacted on Cu alloy substrate at different gas temperatures were characterized. The results indicate that particle flattening ratio increases with the increase of gas temperature, but the increment rate decreases at higher gas temperature. Moreover, the bonding ratio increases due to the increment of material jet area at the interface. It is also found that a typical Ni particle impacted on the substrate consists of shear instability thin layer, severe plastic deformation region, and low plastic deformation region. The quality of the particle/substrate bonding is mainly governed by the shear instability thin layer, while the shape of the deposited particle is mainly governed by the plastic deformation regions. It is confirmed that the successful bonding between Ni particle and Cu alloy substrate can be attributed to the adiabatic shear instability mechanism.

Key words: cold spray gas temperature deposition behavior adiabatic shear instability

Received: 30 October 2006

ZTFLH:

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2007/V43/I8/823

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