- Effect of Carrier Gases on the Microstructure and Properties of Ti Coating Layers Manufactured by Cold Spraying
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Myeong-Ju Lee, Hyung-Jun Kim, Ik-Hyun Oh, Kee-Ahn Lee
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J Powder Mater. 2013;20(1):24-32.
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DOI: https://doi.org/10.4150/KPMI.2013.20.1.024
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 Abstract
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- The effect of carrier gases (He, N_2) on the properties of Ti coating layers were investigated to manufacture high-density Ti coating layers. Cold spray coating layers manufactured using He gas had denser and more homogenous structures than those using N_2 gas. The He gas coating layers showed porosity value of 0.02% and hardness value of Hv 229.1, indicating more excellent properties than the porosity and hardness of N_2 gas coating layers. Bond strengths were examined, and coating layers manufactured using He recorded a value of 74.3 MPa; those manufactured using N_2 gas had a value of 64.6 MPa. The aforementioned results were associated with the fact that, when coating layers were manufactured using He gas, the powder could be easily deposited because of its high particle impact velocity. When Ti coating layers were manufactured by the cold spray process, He carrier gas was more suitable than N_2 gas for manufacturing excellent coating layers.
- Effects of Powder Morphology and Powder Preheating on the Properties and Deposition Behavior of Titanium Coating Layer Manufactured by Cold Spraying
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Jae-Nam Hwang, Myeong-Ju Lee, Hyung-Jun Kim, Ik-Hyun Oh, Kee-Ahn Lee
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J Korean Powder Metall Inst. 2012;19(5):348-355.
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DOI: https://doi.org/10.4150/KPMI.2012.19.5.348
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Abstract
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- Cold spray deposition using Titanium powder was carried out to investigate the effects of powder morphology and powder preheating on the coating properties such as porosity and hardness. The in-flight particle velocity of Ti powder in cold spray process was directly measured using the PIV (particle image velocimetry) equipment. Two types of powders (spherical and irregular ones) were used to manufacture cold sprayed coating layer. The results showed that the irregular morphology particle appeared higher in-flight particle velocity than that of the spherical one under the same process condition. The coating layer using irregular morphology powder represented lower porosity level and higher hardness. Two different preheating conditions (no preheating and preheating at 500°C) were used in the process of cold spraying. The porosity decreased and the hardness increased by conducting preheating at 500°C. It was found that the coating properties using different preheating conditions were dependent not on the particle velocity but on the deformation temperature of particle. The deposition mechanism of particles in cold spray process was also discussed based on the experimental results of in flight-particle velocity.
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Citations
Citations to this article as recorded by  - Solid-state cold spray additive manufacturing of pure tantalum with extraordinary high-temperature mechanical properties
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Journal of Korean Powder Metallurgy Institute.2014; 21(3): 229. CrossRef - Effect of Carrier Gases on the Microstructure and Properties of Ti Coating Layers Manufactured by Cold Spraying
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Journal of Korean Powder Metallurgy Institute.2013; 20(1): 24. CrossRef
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