COLD SPRAY COATING WITH SACRIFICIAL FILLER POWDER
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United States of America Patent
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Oct 31, 2019
app pub date -
Apr 27, 2018
filing date -
Apr 27, 2018
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Abstract
Methods for forming a porous coating with a controlled porosity and pore size are described. The methods include mixing a first powder comprising a first material with a second powder comprising a second material to form a mixed powder comprising 30-99 vol. % of the first powder and 1-70 vol. % of the second powder. The methods further include performing cold spray coating to deposit a coating comprising the first material and the second material onto an article, wherein the coating comprises approximately 30-99 vol. % of the first material and 1-70 vol. % of the second material. The methods further include performing a post-coating process to remove the second material from the coating, wherein after the post-coating process the coating consists essentially of the first material and has a porosity that is approximately equivalent to a volume occupied by the second material prior to the post-coating process.
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