Patent ID: 7910166

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 filter positioned within the interior of the first chamber to allow passage of vapor and carrier gas but not solid material; and a plurality of distribution holes; heating the material such that at least a portion of the material vaporizes into a vapor and passes through the filter; passing the vapor through at least one of the plurality of distribution holes in the first chamber into a second chamber, 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, and the second chamber is positioned to provide a material flow for the vapor that is sufficiently indirect to mix the vapor and the carrier gas into a substantially uniform vapor/carrier gas composition; and directing the substantially uniform vapor/carrier gas composition through an outlet proximate to the second chamber and toward a surface of a substrate proximate to the second chamber and having a temperature lower than the vapor.