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US4469721A
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High emissivity refractory coating, process for manufacturing the same, and coating composition therefor
Assignee: SUN FLATS Inc A CORP OF JAPAN
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Filing: 1983-06-06
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Granted: 1984-09-04
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Expires: 2003-06-06
Abstract
Abstract A high emissivity refractory coating comprising a cured coating composition comprised of a powder mixture containing 17 to 22% by weight of silicon carbide, 6 to 11% by weight of graphite, 17 to 22% by weight of aluminum oxide, 2 to 5% by weight of silicon nitride, 8 to 12% by weight of tricobalt tetroxide, 18 to 22% by weight of cobalt aluminum oxide and 18 to 23% by weight of ferrosilicon, and an aqueous solution of potassium silicate. The high emissivity refractory coating is applied onto the surface of furnace refractories or ceramic fibers. The coating does not peel from the surface of the furnace wall and increases the energy efficiency of the furnace.
Inventors
- 👤 Kiyohiko Shioya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:19
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/628; C04B35/62844; C04B35/62857; C04B35/6286; C04B35/62863; C04B35/515; C04B35/56; C04B35/565; C04B35/62847; C04B35/62852; C04B35/62876; C04B35/62886; C04B35/62897; C04B35/63; C04B35/6303; C04B35/6306; C04B35/6309; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5076; C04B41/5089; C04B41/5092; C04B41/80; C04B41/81; C04B41/85; C09; C09D; C09D1/00; C09D1/02; C22; C22C; C22C29/00; C22C29/005; F; F27; F27D; F27D1/00; F27D1/0003; F27D1/0006; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3231; C04B2235/3244; C04B2235/38; C04B2235/3817; C04B2235/3826; Y; Y02; Y02P; Y02P20/00; Y02P20/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A high emissivity refractory coating composition, comprising: a powder mixture comprised of 17 to 22% by weight of silicon carbide, 6 to 11% by weight of graphite, 17 to 22% by weight of aluminum oxide, 2 to 5% by weight of silicon nitride, 8 to 12% by weight of tricobalt tetroxide, 18 to 22% by weight of cobalt aluminum oxide and 18 to 23% by weight of ferrosilicon; and an aqueous solution of potassium silicate.
Claim 2
Dependent Claim
75 words
A high emissivity refractory coating composition, comprising: a powder mixture comprised of 17 to 22% by weight of silicon carbide, 6 to 11% by weight of graphite, 17 to 22% by weight of aluminum oxide, 2 to 5% by weight of silicon nitride, 8 to 12% by weight of tricobalt tetroxide, 18 to 22% by weight of cobalt aluminum oxide and 18 to 23% by weight of ferrosilicon; and an aqueous solution of potassium silicate.
Claim 3
Dependent Claim
33 words
A refractory coating composition as claimed in claim 1, wherein the powder mixture and the aqueous solution of potassium silicate are present in a weight ratio in the range of 1:1 to 1:1.5.
Claim 4
Dependent Claim
27 words
A refractory coating composition as claimed in claim 1, wherein the aqueous solution of potassium silicate has a potassium silicate content of 50 to 60% by weight.
Claim 5
Dependent Claim
79 words
A high emissivity refractory coating comprising a cured coating composition composed of a powder mixture containing 17 to 22% by weight of silicon carbide, 6 to 11% by weight of graphite, 17 to 22% by weight of aluminum oxide, 2 to 5% by weight of silicon nitride, 8 to 12% by weight of tricobalt tetroxide, 18 to 22% by weight of cobalt aluminum oxide and 18 to 23% by weight of ferrosilicon, and an aqueous solution of potassium silicate.
Claim 6
Dependent Claim
79 words
A high emissivity refractory coating comprising a cured coating composition composed of a powder mixture containing 17 to 22% by weight of silicon carbide, 6 to 11% by weight of graphite, 17 to 22% by weight of aluminum oxide, 2 to 5% by weight of silicon nitride, 8 to 12% by weight of tricobalt tetroxide, 18 to 22% by weight of cobalt aluminum oxide and 18 to 23% by weight of ferrosilicon, and an aqueous solution of potassium silicate.
Claim 7
Dependent Claim
109 words
A process for manufacturing a high emissivity refractory coating, comprising the steps of: mixing a powder mixture containing 17 to 22% by weight of silicon carbide, 6 to 11% by weight of graphite, 17 to 22% by weight of aluminum oxide, 2 to 5% by weight of silicon nitride, 8 to 12% by weight of tricobalt tetroxide, 18 to 22% by weight of cobalt aluminum oxide and 18 to 23% by weight of ferrosilicon, and an aqueous solution of potassium silicate to prepare a suspension; applying the suspension to the surface of a material in order to form a refractory coating thereon; and drying the coating for curing it.
Claim 8
Dependent Claim
109 words
A process for manufacturing a high emissivity refractory coating, comprising the steps of: mixing a powder mixture containing 17 to 22% by weight of silicon carbide, 6 to 11% by weight of graphite, 17 to 22% by weight of aluminum oxide, 2 to 5% by weight of silicon nitride, 8 to 12% by weight of tricobalt tetroxide, 18 to 22% by weight of cobalt aluminum oxide and 18 to 23% by weight of ferrosilicon, and an aqueous solution of potassium silicate to prepare a suspension; applying the suspension to the surface of a material in order to form a refractory coating thereon; and drying the coating for curing it.
Claim 9
Dependent Claim
36 words
A process for manufacturing a high emissivity refractory coating as claimed in claim 5, wherein the drying is carried out by heating the coating to a temperature in the range of 200° C. to 600° C.
Claim 10
Dependent Claim
37 words
A process for producing a high emissivity refractory coating as claimed in claim 5, wherein the weight ratio of the powder mixture to the aqueous solution of potassium silicate is within the range of 1:1 to 1:1.5.
Claim 11
Dependent Claim
32 words
A process for producing a high emissivity refractory coating as claimed in claim 5, wherein the aqueous solution of potassium silicate has a potassium silicate content of 50 to 60% by weight.
Claim 12
Dependent Claim
29 words
A process for producing a high emissivity refractory coating as claimed in claim 5, wherein the material to be coated with the suspension is furnace refractories or ceramic fibers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |