Patent ID: 6368665
Filing Date: 2002-04-09
Classification: B05D,C23C

Abstract:
A chemical vapor deposition process comprising:providing a flowing stream comprising a coating precursor in a fluid medium, directing said flowing stream in atomized or vaporized from through a controlled atmosphere zone comprising a reaction zone and a deposition zone, providing sufficient energy to said flowing stream to cause said coating precursor to react in said reaction zone forming a reacted coating precursor in a gas, providing a substrate having a surface, contacting a first portion of the surface of said substrate with said reacted coating precursor in said deposition zone to deposit a coating on said first portion of the substrate surface and form exhaust gases, causing said exhaust gases to flow through a barrier zone wherein the barrier zone is a clearance provided between the substrate and a collar extending outward from the end of a conduit adjacent the deposition zone, causing said exhaust gases to flow though said barrier zone with sufficient velocity to prevent the flow of gases from ambient atmosphere through said barrier zone and into said controlled atmosphere zone.