Patent ID: 7927659

Claim:
A method for depositing a material on a substrate, comprising: introducing a material including a powder and a carrier gas into a first chamber including an interior, wherein the first chamber is tubular and comprises: a heating element positioned within the interior of the first chamber and heated by resistive heating to a temperature high enough that at least a portion of the powder vaporizes into a vapor; a first flow path through which a mixture of vapor and carrier gas is directed to form a substantially uniform vapor/carrier gas composition; and a plurality of distribution holes; passing the vapor through at least one of the plurality of distribution holes in the first chamber into a second chamber, wherein the first chamber is permeable to the vapor but impermeable to the powder, and wherein the second chamber is tubular and is positioned outside the first chamber so that the second tubular chamber sheaths at least a portion of the first tubular chamber to form a second flow path through which the mixture of vapor and carrier gas is directed to maintain the substantially uniform vapor/carrier gas composition; and directing the substantially uniform vapor/carrier gas composition through the plurality of distribution holes and toward a surface of a substrate proximate to the second chamber and having a temperature lower than the vapor.