US4358544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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
•
Filing: 1981-07-01
•
Granted: 1982-11-09
•
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 17:34
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.
References Cited (Backward Citations)
GB829774A
Cited
GB829775A
Cited
GB860893A
Cited
GB921861A
Cited
GB921086A
Cited
GB905989A
Cited
GB896360A
Cited
GB1032271A
Cited
US3140779A
Cited
GB1124501A
Cited
GB1125623A
Cited
GB1089618A
Cited
GB1094047A
Cited
GB1168385A
Cited
GB1299872A
Cited
US3840461A
Cited
SU625816A1
Cited
JPS5225815A
Cited
FR2422452A1
Cited
US4281528A
Cited
US4291107A
Cited
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 |