US12570583USUSPTO Grant XML

Hybrid high and low temperature coating

A high temperature article includes a carbon/carbon (C/C) composite substrate and a hybrid coating on the C/C composite substrate. The hybrid coating includes a high temperature antioxidant layer on a surface of the C/C composite substrate and a low temperature sealant on a surface of the high temperature antioxidant layer. The low temperature sealant is formed from a glass-forming soluble salt.

Patent

Brief

Patent brief

Problem

How can corrosion in underground pipelines and conduits be prevented?

Novelty

The hybrid coating includes a high temperature antioxidant layer on a surface of the C/C composite substrate and a low t...

Uses

Underground pipe, Metal conduit, Industrial line

Assignee

Honeywell International Inc.

Published

Mar 10, 2026

Inventors

Mehrad Mehr, Bahram Jadidian

Domain

Infrastructure / energy

Plain-English summary

Problem

How can corrosion in underground pipelines and conduits be prevented?

Solution

high temperature article includes a carbon/carbon (C/C) composite substrate and a hybrid coating on the C/C composite substrate.

Key novelty

The hybrid coating includes a high temperature antioxidant layer on a surface of the C/C composite substrate and a low temperature sealant on a surface of the high temperature antioxidant layer.

Applications

Underground pipeMetal conduitIndustrial line

Relevant search intents

coating

Claims preview

1. A method for forming a hybrid coating, comprising: forming a high temperature antioxidant coating on a carbon/carbon (C/C) composite substrate via reactive slurry melt infiltration, wherein the high temperature antioxidant coating formed via the reactive slurry melt infiltration includes excess free metal; applying a sealant mixture to a surface of the high temperature antioxidant coating, wherein the sealant mixture comprises a glass-forming soluble salt in a solvent; and removing the solvent to form a low temperature sealant from the glass-forming soluble salt on the high temperature antioxidant coating; and forming an outer layer of a metal oxide on the high temperature antioxidant coating, wherein the metal oxide is formed from the excess free metal. 2. The method of claim 1 , wherein the surface of the high temperature antioxidant coating includes a plurality of microcracks, and wherein the low temperature sealant fills at least a portion of the plurality of microcracks. 3. The method of claim 1 , wherein the low temperature sealant has a thermal degradation temperature greater than about 1200 C.

Linked approaches

Protective coatings

Barrier layers that isolate metal surfaces from corrosive environments.

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