Process for making a chemically-resistant porcelain enamel

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Claims

2. The process as recited in claim 1, wherein each of said first slurry, said twice slurry, and said thrice slurry is comprised of water.

3. The process as recited in claim 1, wherein said solid material in said first slurry is comprised of from about 1 to about 6 weight percent of cobalt oxide.

4. The process as recited in claim 1, wherein said solid material in said first slurry is comprised of from about 0.2 to about 4 weight percent of nickel oxide.

5. The process as recited in claim 1, wherein each of said first slurry, said twice slurry, and said thrice slurry is contacted with said substrate by spraying it onto said substrate.

6. The process as recited in claim 1, wherein said inorganic fiber consists essentially of amorphous silica.

7. The process as recited in claim 6, wherein said inorganic fiber has a coefficient of thermal expansion of from about 0 to about 20.times.0.0000001 centimeters per centimeter per degree Centigrade.

8. The process as recited in claim 6, wherein said inorganic fiber has a coefficient of thermal expansion of from about 4 to about 10.times.0.0000001 centimeters per centimeter per degree Centigrade.

9. The process as recited in claim 6, wherein said inorganic fiber has an aspect ratio of from about 15:1 to about 25:1.

10. The process as recited in claim 1, wherein said substrate is comprised of a substantially planar surface.

11. The process as recited in claim 1, wherein said substrate is comprised of a substantially concave surface.

12. The process as recited in claim 1, wherein said substrate is comprised of a substantially convex surface.

13. The process as recited in claim 1, wherein said twice slurry is comprised of an alcohol of the formula ROH wherein R is lower alkyl containing from about 1 to about 3 carbon atoms.

14. The process as recited in claim 13, wherein said thrice slurry is comprised of an alcohol of the formula ROH wherein R is lower alkyl containing from about 1 to about 3 carbon atoms.

15. The process as recited in claim 14, wherein said alcohol is ethanol.

Referenced Cited
U.S. Patent Documents
2563502 August 1951 Sweo
4407868 October 4, 1983 Iizawa
4975391 December 4, 1990 Shimizu et al.
Patent History
Patent number: RE35625
Type: Grant
Filed: Sep 6, 1995
Date of Patent: Oct 7, 1997
Assignee: Pfaudler, Inc. (Rochester, NY)
Inventor: Thomas R. Roberts (Rochester, NY)
Primary Examiner: Benjamin Utech
Attorney: Michael L. Dunn
Application Number: 8/524,219
Classifications
Current U.S. Class: 427/3762; 427/4194; 427/4196
International Classification: B05D 302;