Patent US3850684A successfully refreshed from Google Patents.
US3850684A
Expired / Lapsed
US
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Protective coating for materials exposed to molten aluminum and its alloys
Assignee: Olin Corp
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Filing: 1973-02-20
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Granted: 1974-11-26
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Expires: 1993-02-20
Abstract
Abstract A protectively coated structural part for contact with molten metal and a process for protecting articles to be in contact with molten metal. The structural part is coated to a thickness of at least 0.002 inch with a coating composition of a mixture of finely divided powders consisting essentially of: A. 30 to 70 percent by weight of a refractory material consisting essentially of tri-calcium phosphate, B. 10 to 30 percent by weight of aluminum oxide, C. 2 to 8 percent by weight of a smoothing agent, D. 3 to 10 percent by weight of raw Kaolin clay, and E. 12 to 45 percent magnesium orthoborate.
Inventors
- 👤 E Gamble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/66; C04B35/01; C04B35/447; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C23; C23C; C23C24/00; C04B2111/00; C04B2111/00474; C04B2111/00482; C04B2111/0087; C04B2111/00879; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3217; C04B2235/42; C04B2235/422; C04B2235/44; C04B2235/447; C04B2235/70; C04B2235/96; C04B2235/9669; C04B2235/9676; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/259; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
A PROTECTIVELY COATED STRUCTURAL PART FOR CONTACT WITH MOLTEN METAL, SAID STRUCTURAL PART COATED TO A THICKNESS OF AT LEAST 0.002 INCH WITH A COATING COMPOSITION OF A MIXTURE OF FINELY DIVIDED POWDERS CONSISTING ESSENTIALLY OF: A. 30 TO 70 PERCENT BY WEIGHT OF A REFRACTORY MATERIAL CONSISTING ESSENTIALLY OF TRI-CALCIUM PHOSPHATE, B. 10 TO 30 PERCENT BY WEIGHT OF ALUMINUM OXIDE, C. 2 TO 8 PERCENT BY WEIGHT OF A SMOOTHING AGENT, D. 3 TO 10 PERCENT BY WEIGHT OF A RAW KAOLIN CLAY, AND E. 12 TO 45 PERCENT MAGNESIUM ORTHOBORATE.
Claim 2
Dependent Claim
93 words
A PROTECTIVELY COATED STRUCTURAL PART FOR CONTACT WITH MOLTEN METAL, SAID STRUCTURAL PART COATED TO A THICKNESS OF AT LEAST 0.002 INCH WITH A COATING COMPOSITION OF A MIXTURE OF FINELY DIVIDED POWDERS CONSISTING ESSENTIALLY OF: A. 30 TO 70 PERCENT BY WEIGHT OF A REFRACTORY MATERIAL CONSISTING ESSENTIALLY OF TRI-CALCIUM PHOSPHATE, B. 10 TO 30 PERCENT BY WEIGHT OF ALUMINUM OXIDE, C. 2 TO 8 PERCENT BY WEIGHT OF A SMOOTHING AGENT, D. 3 TO 10 PERCENT BY WEIGHT OF A RAW KAOLIN CLAY, AND E. 12 TO 45 PERCENT MAGNESIUM ORTHOBORATE.
Claim 3
Dependent Claim
21 words
A protectively coated structural part according to claim 1 wherein said coating includes from 4 to 30 percent by weight graphite.
Claim 4
Dependent Claim
29 words
A protectively coated structural part according to claim 1 wherein at least 97 percent of said ingredients A., B., C., and D. will pass through a 200 mesh sieve.
Claim 5
Dependent Claim
51 words
A protectively coated structural part according to claim 1 wherein said magnesium orthoborate component is provided by the addition of from 7 to 25 percent boric acid, from 5 to 20 percent light magnesium oxide and water which produces nonhydratable magnesium orthoborate and up to 15 percent of unreacted magnesium oxide.
Claim 6
Dependent Claim
113 words
A process for protecting articles to be in contact with molten metal comprising: I. preparing an aqueous slurry containing a mixture of finely divided powders consisting essentially of A. 30 to 70 percent by weight of a refractory material consisting essentially of tri-calcium phosphate, B. 10 to 30 percent by weight of aluminum oxide, C. 2 to 8 percent by weight of a smoothing agent, D. 3 to 10 percent by weight of raw Kaolin clay, and E. 12 to 45 percent magnesium orthoborate; II. applying said slurry to the article to be protected to a thickness of at least 0.002 inch; and III. drying the slurry coated article to remove the moisture.
Claim 7
Dependent Claim
113 words
A process for protecting articles to be in contact with molten metal comprising: I. preparing an aqueous slurry containing a mixture of finely divided powders consisting essentially of A. 30 to 70 percent by weight of a refractory material consisting essentially of tri-calcium phosphate, B. 10 to 30 percent by weight of aluminum oxide, C. 2 to 8 percent by weight of a smoothing agent, D. 3 to 10 percent by weight of raw Kaolin clay, and E. 12 to 45 percent magnesium orthoborate; II. applying said slurry to the article to be protected to a thickness of at least 0.002 inch; and III. drying the slurry coated article to remove the moisture.
Claim 8
Dependent Claim
22 words
A process according to claim 5 wherein said slurry is a suspension of said powders containing from 50 to 75 percent water.
Claim 9
Dependent Claim
16 words
A process according to claim 6 wherein said mixture includes from 4 to 30 percent graphite.
Claim 10
Dependent Claim
47 words
A process according to claim 6 wherein said magnesium orthoborate component is provided by the addition of from 7 to 25 percent boric acid, 5 to 20 percent light magnesium oxide and water which produces nonhydratable magnesium orthoborate and up to 15 percent of unreacted magnesium oxide.
Claim 11
Dependent Claim
21 words
A process according to claim 8 wherein said boric acid-magnesium oxide mixture contains from 1 to 15 percent unreacted magnesium oxide.
References Cited (Backward Citations)
US3464839A
Cited
US3615918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |