Patent ID: 6051275
Filing Date: 2000-04-18
Classification: C23C,F23D

Abstract:
A method of coating an article having orifices therein with heat resistant porcelain material on its interior and exterior surfaces, comprising the steps of:providing an article having apertures therein to be coated;providing a first porcelain-containing aqueous slip;immersing said article in said slip to coat the interior and exterior surfaces and the peripheral shoulders of said orifices;removing excess slip from said apertures and said exterior surface while retaining a coating of said porcelain-containing slip on the shoulders of said orifices;applying a second porcelain-containing slip coating to said exterior surface and to said shoulders of said orifices;firing said article at sufficient temperatures to thermally bond the porcelain of said first porcelain-containing slip to said interior surfaces, andthermally bond the porcelain of said second porcelain-containing slip to said exterior surfaces, and also provide a thermal bonded porcelain coating around said shoulders of said orifices to form a porcelain-coated article.