Current Status and Future Prospects of Warm Spray Technology |
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Authors: | Seiji Kuroda Makoto Watanabe KeeHyun Kim Hiroshi Katanoda |
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Affiliation: | (1) National Institute for Material Science, Sengen 1-2-1, Tsukuba Ibaraki, 305-0047, Japan;(2) Kagoshima University, Korimoto 1-21-24, Kagoshima 890-0065, Japan |
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Abstract: | A modification of high-velocity oxy-fuel (HVOF) thermal spray process named as warm spray (WS) has been developed. By injecting
room temperature inert gas into the combustion gas jet of HVOF, the temperature of the propellant gas can be controlled in
a range approximately from 2300 to 1000 K so that many powder materials can be deposited in thermally softened state at high
impact velocity. In this review, the characteristics of WS process were analyzed by using gas dynamic simulation of the flow
field and heating/acceleration of powder particles in comparison with HVOF, cold spray (CS), and high-velocity air-fuel (HVAF)
spray. Transmission electron microscopy of WS and CS titanium splats revealed marked differences in the microstructures stemming
from the different impact temperatures. Mechanical properties of several metallic coatings formed under different WS and CS
conditions were compared. Characteristics of WC-Co coatings made by WS were demonstrated for wear resistant applications. |
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Keywords: | |
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