Patent US4358544A successfully refreshed from Google Patents.
US4358544A
Expired / Lapsed
US
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Single phase glass compositions for use in protective and lubricating coatings for the heat treatment and hot working of metals
Assignee: Daniel Doncaster and Sons Ltd
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Filing: 1981-07-01
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Granted: 1982-11-09
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Expires: 2001-07-01
Abstract
Abstract The coatings are glass compositions which consist essentially of from 18 to 45 mol % of the alkaline oxides CaO and one or both of Na 2 O and K 2 O and from 5 to 22 mol % of Al 2 O 3 , the balance being B 2 O 3 and SiO 2 in such amounts that the molar ratio of B 2 O 3 : (B 2 O 3 +SiO 2 ) lies in the range from 0.575:1 to 0.85:1. The molar ratio of K 2 O: (K 2 O+Na 2 O) is from 0.4:1 to 0.6:1 and CaO is 48 to 52 mole % of the alkaline oxides. These compositions are particularly suitable for use during the heat-treatment and hot-working of titanium and its alloys.
Inventors
- 👤 Anthony N. Skedgell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:45
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/68; B; B22; B22D; B22D11/00; B22D11/07; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/076; C03C3/089; C03C3/091; C03C3/12; C03C3/14; C03C3/145; C03C4/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
A glass composition which in the molten state forms only a single liquid phase and is suitable for use as a protective and lubricating coating in the heat treatment and hot forming of metals and alloys, the composition consisting essentially of the following alkaline oxides, CaO, Na 2 O and K 2 O and the following acidic oxides, B 2 O 3 , SiO 2 and Al 2 O 3 , the composition consisting essentially of the alkaline oxides in a total amount of from 18 to 45 mol %, from 5 to 22 mol % of Al 2 O 3 , the molar ratio of K 2 O:(K 2 O+Na 2 O) in the range from 0.4:1 to 0.6:1, 48 to 52 mol % of the alkaline oxides being CaO, and the balance being B 2 O 3 and SiO 2 in the molar ratio of B 2 O 3 :(B 2 O 3 +SiO 2 ) in the range from 0.575:1 to 0.85:1.
Claim 2
Dependent Claim
165 words
A glass composition which in the molten state forms only a single liquid phase and is suitable for use as a protective and lubricating coating in the heat treatment and hot forming of metals and alloys, the composition consisting essentially of the following alkaline oxides, CaO, Na 2 O and K 2 O and the following acidic oxides, B 2 O 3 , SiO 2 and Al 2 O 3 , the composition consisting essentially of the alkaline oxides in a total amount of from 18 to 45 mol %, from 5 to 22 mol % of Al 2 O 3 , the molar ratio of K 2 O:(K 2 O+Na 2 O) in the range from 0.4:1 to 0.6:1, 48 to 52 mol % of the alkaline oxides being CaO, and the balance being B 2 O 3 and SiO 2 in the molar ratio of B 2 O 3 :(B 2 O 3 +SiO 2 ) in the range from 0.575:1 to 0.85:1.
Claim 3
Dependent Claim
55 words
A composition according to claim 1 wherein the Al 2 O 3 content lies in the range from 19 to 21 mol % and the alkaline oxide content lies in the range from 19 to 22 mol % said glass having a log viscosity of about 4 poise at the working temperature of 900°-1000° C.
Claim 4
Dependent Claim
55 words
A composition according to claim 1 wherein the Al 2 O 3 content lies in the range from 10 to 20 mol % and the alkaline oxide content lies in the range from 30 to 35 mol % said glass having a log viscosity of about 4 poise at the working temperature of 900°-1000° C.
Claim 5
Dependent Claim
39 words
A composition as claimed in claim 1 which comprises (in mol %), 45% B 2 O 3 , 20% Al 2 O 3 , 15% SiO 2 , 5% Na 2 O, 5% K 2 O and 10% CaO.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |