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Electrophoretically active sol-gel processes to backfill, seal, and/or densify porous, flawed, and/or cracked coatings on electrically conductive material

  • US 5,925,228 A
  • Filed: 01/09/1997
  • Issued: 07/20/1999
  • Est. Priority Date: 01/09/1997
  • Status: Expired due to Fees
First Claim
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1. A method to seal a porous coating on an electrically conductive substrate with sol-gel ceramic by electrophoretically active sol-gel processes, comprising:

  • cleaning the coating on the electrically conductive substrate;

    electrophoretically depositing, preferentially at locally high electric-field sites associated with pores, cracks, and flaws, a prescribed amount of ceramic-precursor compounds from sol-gel ceramics onto and into the coating, comprising immersing the coating and its substrate, electrically biased, spaced adjacent an oppositely biased electrode, in an electrophoretically active sol-gel solution; and

    heating the coating and substrate to cause a chemical reaction to form a ceramic from the ceramic-precursor compounds to penetrate into and seal the coating, said ceramic being inseparably bound to the coating and the substrate.

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