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EP0492826A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Reverse direction pyrolysis processing

Assignee: Dow Silicones Corp
•
Filing: 1991-12-03
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Granted: —
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Expires: 2011-12-03
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Abstract

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.

Inventors

  • 👤 Mark Jon Loboda

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 09:09
CPC Classifications
H; H05; H05K; H05K3/00; C; C23; C23C; C23C18/00; C23C18/02; C23C18/12; C23C18/1204; C23C18/1208; C23C18/125; C23C18/1291

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 99 words
A method of forming a ceramic coating on a substrate comprising applying a coating comprising a preceramic compound on a substrate, creating a temperature gradient in the coating by heating the substrate to a temperature sufficient to facilitate ceramification of the interior surface of the coating while directing a stream of cooling gas at the exterior surface of the coating, said cooling gas having a flow rate and temperature sufficient to deter ceramification of the exterior surface of the coating and decreasing the temperature gradient in the coating sufficiently to facilitate ceramification of the exterior surface of the coating.
Claim 2
Independent Claim 99 words
A method of forming a ceramic coating on a substrate comprising applying a coating comprising a preceramic compound on a substrate, creating a temperature gradient in the coating by heating the substrate to a temperature sufficient to facilitate ceramification of the interior surface of the coating while directing a stream of cooling gas at the exterior surface of the coating, said cooling gas having a flow rate and temperature sufficient to deter ceramification of the exterior surface of the coating and decreasing the temperature gradient in the coating sufficiently to facilitate ceramification of the exterior surface of the coating.
Claim 3
Dependent Claim 32 words
The method of claim 1 wherein the coating is applied by a process comprising coating the substrate with a solution comprising a solvent and a preceramic compound and then evaporating the solvent.
Claim 4
Dependent Claim 61 words
The method of claim 1 wherein the temperature gradient is decreased by a method selected from the group consisting of adjusting the gas temperature or flow rate over time, adjusting the heat source over time and maintaining the heat source and the gas temperature and flow rate for a period of time sufficient to ceramify the exterior surface of the coating.

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