초록 ▼

A two-step method to porcelain-coat an article is provided particularly useful for porcelain-coating a gas burner used in a gas-fired residential barbecue grill. A gas burner constructed from mild enameling-grade steel is dipped in a slip containing porcelain frit and manipulated so that the slip ad

A two-step method to porcelain-coat an article is provided particularly useful for porcelain-coating a gas burner used in a gas-fired residential barbecue grill. A gas burner constructed from mild enameling-grade steel is dipped in a slip containing porcelain frit and manipulated so that the slip adequately coats and adheres to the interior surfaces of the burner. The porcelain-containing slip simultaneously coats and adheres to the peripheral "shoulders" and particularly to the interior "shoulders", of the gas jet openings of the burner. A second coating of porcelain-containing powder is then applied, for example, electrostatically or by other conventional powder application techniques, to the exterior surfaces of the burner. The properties of the porcelain-containing powder of the second coating are adjusted for optimal coating properties. Then, the double coated gas burner is fired in a continuous furnace at a peak firing temperature of 1480.degree. F. to 1550.degree. F., with a target of 1530.degree. F..+-.10.degree. F. for about ten minutes, which adequately bonds the porcelain to the steel gas burner.

대표청구항 ▼

[ We claim:] [25.] A method of porcelain coating the interior and exterior surfaces and orifice surfaces of a steel gas burner comprising the steps of:a) providing a pre-formed steel gas burner having orifices therein;b) alkaline washing said gas burner to clean the surfaces of said gas burner;c) pr

[ We claim:] [25.] A method of porcelain coating the interior and exterior surfaces and orifice surfaces of a steel gas burner comprising the steps of:a) providing a pre-formed steel gas burner having orifices therein;b) alkaline washing said gas burner to clean the surfaces of said gas burner;c) providing a porcelain-containing slip of specific gravity in the range of about 1.59 to about 1.66, said slip comprising about 90 to about 100 percent glass frit, about 0 to about 10 percent clays, about 0 to about 0.5 percent electrolytes and about 0 to 1.0 percent oxides mixed in water;d) hand dipping said alkaline-washed gas burners in said slip and manipulating said burner in said slip so as to provide a coating of same slip on the peripheral shoulders of said orifices and the interior surfaces of said gas burner of a fired thickness in the range of about 1.5 to about 2.5 mils;e) removing excess slip from the orifices of said gas burner, leaving said slip coated on the peripheral shoulders of said orifices;f) removing excess slip from the exterior surfaces of said burner and drying said exterior surfaces;g) electrostatically spraying an acid-resistant porcelain-containing powder to said dried exterior surfaces of said gas burner to provide a fired thickness of about 2.5 to about 5.5 mils; andh) firing the coated and sprayed burners in a continuous furnace, wherein said coated and sprayed burners are suspended on a line traveling through said furnace at a line speed of about 20 feet per minute and where the coated and sprayed burners are subjected to a peak firing temperature of about 1520.degree. F. to about 1540.degree. F. for about five minutes to thermally bond said porcelain of said porcelain-containing slip and said porcelain-containing powder to said interior surfaces and said exterior surfaces and said peripheral shoulders of said orifices of said burner to form a porcelain coated steel gas burner.