Coating processes – Restoring or repairing
Patent
1987-09-21
1989-02-14
Childs, Sadie
Coating processes
Restoring or repairing
427190, 427199, 427299, 427369, 4273762, 427380, 4273977, B32B 3500
Patent
active
048045624
ABSTRACT:
Defects in green, unsintered ceramic casting cores which contain a thermoplastic binder are repaired according to this invention. In a preferred embodiment, a mixture of a volatilizable solvent and ceramic particles are applied to the defect. The solvent softens the binder in the core, and the loose ceramic particles patch the defect area. After the solvent volatilizes, the binder hardens and binds the newly applied particles to the core. Then, the repaired core is heated to a first temperature to volatilize the binder, and then to a second, higher temperature to sinter the ceramic particles to each other.
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Ferguson T. Arnold
Seaver Linda L.
Childs Sadie
Rashid James M.
United Technologies Corporation
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