Reverse direction pyrolysis processing

Details Reverse direction pyrolysis processing Reverse direction pyrolysis processing

B - Operations, Transporting

32

B

B32B 18/00 (2006.01) C23C 18/12 (2006.01)

Patent

CA 2057082

REVERSE DIRECTION PYROLYSIS PROCESSING ABSTRACT The present invention relates to a method of forming a homogeneous ceramic coating on a substrate. The method comprises depositing a preceramic coating on a substrate and then heating the substrate while directing a stream of cooling gas at the surface of the preceramic coating such that a temperature gradient is developed in the coating. This temperature gradient is created in such a way that the preceramic material near the substrate is converted to its ceramic form while the preceramic material near the surface of the coating is deterred from conversion. The temperature gradient is then decreased over time such that all of the preceramic material ceramifies from the substrate outward to form a homogeneous coating on the substrate.

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