Coated substrates

• US 5,326,633 A
• Filed: 11/09/1992
• Issued: 07/05/1994
• Est. Priority Date: 03/24/1986
• Status: Expired due to Fees

• Current Assignee: Ensci, Inc.
• Original Assignee: Ensci, Inc.
• Inventors: Clough, Thomas J., Pinsky, Naum, Grosvenor, Victor L.
• Primary Examiner(s): Bell, James J.
• Application Number:
  US07/972,857
• Time in Patent Office: 603 Days
• Field of Search: 428/288, 428/402, 428/403, 428/406, 428/307.7, 428/224, 428/307.3, 428/404, 427/126.1, 427/126.3
• US Class Current: 442/110
• CPC Class Codes: D04H 1/587 characterised by the bonding agents used
• CPC Class Codes: D04H 1/64 the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
• CPC Class Codes: Y10T 428/24149 Honeycomb-like
• CPC Class Codes: Y10T 428/24744 Longitudinal or transverse tubular cavity or cell
• CPC Class Codes: Y10T 428/249956 Void-containing component is inorganic
• CPC Class Codes: Y10T 428/249957 Inorganic impregnant
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2993 Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
• CPC Class Codes: Y10T 428/2996 Glass particles or spheres
• CPC Class Codes: Y10T 442/2418 Coating or impregnation increases electrical conductivity or anti-static quality
• CPC Class Codes: Y10T 442/2992 Coated or impregnated glass fiber fabric

Abstract

Coated substrates are disclosed comprising a three-dimensional inorganic substrate having a coating of electrically conductive tin oxide on at least a portion of all three dimensions thereof, produced by a unique process having particular applicability to the manufacture of tin oxide coated three-dimensional substrates. Certain novel coated substrates, such as flakes, spheres and monoliths are disclosed. The coated substrates are useful in battery, catalysis, heating, shielding and field dependent fluid applications.

Claims

1. An article comprising a three dimensional inorganic substrate other than electrically conductive tin oxide having a coating containing electrically conductive tin oxide on at least a portion of all three dimensions thereof produced by a process comprising:

contacting an inorganic three dimensional substrate which includes external surfaces and shielded surfaces which are at least partially shielded by other portions of said substrate with a composition comprising a tin chloride-forming compound at conditions effective to form a tin chloride-forming compound containing coating on at least a portion of said substrate;

forming a liquidus tin chloride-forming compound containing coating on at least a portion of the three dimensions of said substrate including the shielded surfaces of said substrate and at conditions effective to do at least one of the following;

(1) coat a larger portion of said substrate with said tin chloride-forming compound;

(2) distribute said tin chloride-forming compound over said substrate; and

(3) make said tin chloride-forming compound containing coating more uniform in thickness; and

contacting said substrate with said tin chloride-forming compound containing coating with an oxidizing agent at conditions effective to convert the tin chloride forming compound to tin oxide and form a tin oxide coating on at least a portion of said three dimensions of said substrate including the shielded surfaces of said substrate.

2. The article of claim 1 which further comprises contacting said substrate with a dopant-forming component at conditions effective to form a dopant-forming component containing coating on said substrate, said dopant-forming component contacting occurring prior to the substantially complete oxidation of tin chloride-forming compound.

3. The article of claim 1 wherein the tin chloride forming compound is stannous chloride.

4. The article of claim 2 wherein the dopant forming component is a fluorine component.

5. The article of claim 2 wherein the tin chloride forming compound is stannous chloride.

6. The article of claim 4 wherein the tin chloride forming compound is stannous chloride.

7. The article of claim 1 wherein said substrate is an inorganic oxide and in a form selected from the group consisting of spheres, extrudates, flakes, fibers, fiber rovings, chopped fibers, fiber mats, porous substrates, irregularly shaped particles, and multi-channel monoliths.

8. The article of claim 2 wherein said substrate is an inorganic oxide and in a form selected from the group consisting of spheres, extrudates, flakes, fibers, fiber rovings, chopped fibers, fiber mats, porous substrates, irregularly shaped particles, and multi-channel monoliths.

9. The article of claim 4 wherein said substrate is an inorganic oxide and in a form selected from the group consisting of spheres, extrudates, flakes, fibers, porous substrates, and irregularly shaped particles.

10. The article of claim 6 wherein said substrate is an inorganic oxide and in a form selected from the group consisting of spheres, extrudates, flakes, fibers, porous substrates, and irregularly shaped particles.

11. An article comprising a three dimensional inorganic substrate other than electrically conductive tin oxide having a coating containing electrically conductive tin oxide on at least a portion of all three dimensions thereof produced by a process comprising:

contacting an inorganic three dimensional substrate with a composition comprising a tin oxide precursor powder at conditions effective to form a coating containing tin oxide precursor on at least a portion of the substrate;

forming a liquidus tin oxide precursor on at least a portion of the three dimensions of said substrate including the shielded surfaces of said substrate and at conditions effective to do at least one of the following;

(1) coat a larger portion of said substrate with said coating containing tin oxide precursor;

(2) distribute said coating containing tin oxide precursor over said substrate; and

(3) make said coating containing tin oxide precursor more uniform in thickness; and

contacting said coated substrate with an oxidizing agent at conditions effective to convert said tin oxide precursor to tin oxide on at least a portion of said three dimensions of said substrate and form a substrate having a tin oxide-containing coating.

12. The article of claim 11 which further comprises contacting said substrate with a dopant-forming component at conditions effective to form a dopant-forming component containing coating on said substrate, said dopant-forming component contacting occurring prior to the substantially complete oxidation of tin chloride-forming compound.

13. The article of claim 11 wherein the tin chloride forming compound is stannous chloride.

14. The article of claim 12 wherein the dopant forming component is a fluorine component.

15. The article of claim 12 wherein the tin chloride forming compound is stannous chloride.

16. The article of claim 14 wherein the tin chloride forming compound is stannous chloride.

17. The article of claim 11 wherein said substrate is an inorganic oxide and in a form selected from the group consisting of spheres, extrudates, flakes, fibers, fiber rovings, chopped fibers, fiber mats, porous substrates, irregularly shaped particles, and multi-channel monoliths.

18. The article of claim 12 wherein said substrate is an inorganic oxide and in a form selected from the group consisting of spheres, extrudates, flakes, fibers, fiber rovings, chopped fibers, fiber mats, porous substrates, irregularly shaped particles, and multi-channel monoliths.

19. The article of claim 14 wherein said substrate is an inorganic oxide and in a form selected from the group consisting of spheres, extrudates, flakes, fibers, porous substrates, and irregularly shaped particles.

20. The article of claim 16 wherein said substrate is an inorganic oxide and in a form selected from the group consisting of spheres, extrudates, flakes, fibers, porous substrates, and irregularly shaped particles.

21. An article comprising a three dimensional inorganic substrate other than an electrically conductive tin oxide wherein the substrate is an inorganic oxide spherical substrate selected from the group consisting of alumina, zeolites, boria, zeolite modified inorganic oxide, alumina phosphorous oxide, sodium borosilicate, soda lime glass, borosilicate glass, and mixtures thereof, said substrate having a coating containing electrically conductive doped tin oxide on at least a portion of all three dimensions of said substrate including the shieldied surfaces of said substrate.

22. An article of claim 21 wherein the spherical substrate is a hollow sphere having a spherical roundness of greater than about 70 percent and said substrate has a diameter of from about 1 micron to about 500 microns.

25. The article of claim 21 wherein the doped tin oxide, is a fluoride doped tin oxide.

26. The article of claim 22 wherein the doped tin oxide, is a fluoride doped tin oxide.

23. An article comprising a three dimensional inorganic substrate other than an electrically conductive tin oxide wherein the substrate is an inorganic oxide platelet substrate wherein the inorganic oxide is selected from the group consisting of alumina, silica, zirconia, magnesia, titania, silica alumna, zeolites, boria, zeolite modified inorganic oxide, alumina phosphorous oxide, sodium borosilicate, soda lime glass, borosilicate glass, hydrous aluminum silicate, mica, C glass and mixtures thereof, said substrate having a coating containing electrically conductive doped tin oxide on at least a portion of all three dimensions of said substrate including the shielded surfaces of said substrate.

24. The article of claim 23 wherein the substrate is C glass and the substrate has an aspect ratio of average length to average width from about 5 to 1 to about 2,000 to 1.

27. The article of claim 23 wherein the doped tin oxide, is a fluoride doped tin oxide.

28. The article of claim 24 wherein the doped tin oxide, is a fluoride doped tin oxide.

29. An article comprising a three dimensional inorganic substrate other than an electrically conductive tin oxide wherein the substrate is an inorganic monolith substrate wherein the substrate is selected from the group consisting of cordierite, silicon nitride, alumina, silica, magnesium aluminate spinel, titania, silica alumna, zeolites, mordenite and mixtures thereof, said substrate having a coating containing electrically conductive doped tin oxide on at least a portion of all three dimensions of said substrate including the shielding surfaces of said substrate.

30. The article of claim 29 wherein the doped tin oxide, is fluoride doped tin oxide.

31. The article of claim 29 wherein the substrate is selected from the group consisting of cordierite, alumina, titania and mordenite.