Coating processes – Coating by vapor – gas – or smoke
Patent
1998-10-28
2000-01-04
Meeks, Timothy
Coating processes
Coating by vapor, gas, or smoke
427250, 42725523, 75414, 75639, 75641, 75673, 438584, 438687, 438688, C23C 1606
Patent
active
060107499
ABSTRACT:
A metal volatilization process is described in which metal oxide pieces in a reaction chamber are reduced to form reduced metal and at least a portion of that metal is volatilized and used for coating a variety of substrates, including those which are susceptible to heat damage. The metal oxides formed must have curved surfaces which maintain a non-zero contact angle with their support during reduction. Preferably the reduction phase is preceded by an oxidation phase which is conducted in the same chamber, and uses as the starting materials oxidizable metal pieces which also are curved to maintain a non-zero contact angle with the support, so that general curved shapes will be maintained throughout the oxidation and reduction phases of the process. Vacuum is unnecessary, and the process can be operated at ambient pressures. Any metal or metal oxide may be used which can be reacted under reasonable temperature conditions and which preferably obeys a power law with respect to the reaction rate of the reduction phase of the process. Preferred metals are copper, aluminum, the transition metals and the coinage metals and alloys thereof. Commonly during reduction recesses form in the residual pieces, such that the residual pieces may themselves be valuable by-products.
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