US4537323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mo-Ti members with non-metallic sintering aids
Assignee: Osram Sylvania Inc
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Filing: 1984-01-09
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Granted: 1985-08-27
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Expires: 2004-01-09
Abstract
Abstract Boron, oxygen, or a mixture thereof, is used as a sintering aid in sintering Mo-Ti alloys. Compounds formed between these sintering aids and the Mo or Ti have thermal expansion coefficients consistent with that of alloys of Mo and Ti. An hermetic member may be made using these constituents. The hermetic member may be used to seal an assembly such as a high pressure sodium lamp.
Inventors
- 👤 Brian M. Ditchek
- 👤 Thomas R. Middleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:27
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/1003; B22F1/00; B22F1/12; C; C22; C22C; C22C14/00; C22C27/00; C22C27/04; C22C32/00; C22C32/001; C22C32/0015; C22C32/0031; H; H01; H01J; H01J61/00; H01J61/02; H01J61/36; H01J61/361; H01J61/363
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
57 words
A member having an approximately uniform thermal expansion coefficient, said member sintered from a mixture comprised of molybdenum in the form of approximately -325 mesh powder, titanium in the form of approximately -325 mesh powder, and, as a sintering aid, 0.01 to 5 weight percent of oxygen in the form of oxide or boron or mixtures thereof.
Claim 2
Dependent Claim
57 words
A member having an approximately uniform thermal expansion coefficient, said member sintered from a mixture comprised of molybdenum in the form of approximately -325 mesh powder, titanium in the form of approximately -325 mesh powder, and, as a sintering aid, 0.01 to 5 weight percent of oxygen in the form of oxide or boron or mixtures thereof.
Claim 3
Dependent Claim
17 words
The member of claim 1 wherein said sintering aid is approximately 0.025 to 0.5 weight percent boron.
Claim 4
Dependent Claim
17 words
The member of claim 1 wherein said sintering aid is approximately 1 to 2.5 weight percent oxygen.
Claim 5
Dependent Claim
19 words
The member of claim 1 which further includes approximately 1 weight percent of nickel, cobalt, copper, or mixtures thereof.
Claim 6
Dependent Claim
17 words
The member of claim 4 wherein said sintering aid is approximately 0.025 to 0.5 weight percent boron.
Claim 7
Dependent Claim
17 words
The member of claim 4 wherein said sintering aid is approximately 1 to 2.5 weight percent oxygen.
Claim 8
Independent Claim
90 words
A method of manufacturing a member having an approximately uniform thermal expansion coefficient, comprising the steps of: providing molybdenum in the form of approximately -325 mesh powder; providing titanium in the form of approximately -325 mesh powder; providing approximately 0.01 to 5 weight percent of oxygen in the form of oxide, or boron, or a mixture thereof; mixing the foregoing components in an inert atmosphere; pressing the resulting mixture into a desired shape; and heating the pressed mixture in an inert atmosphere to a temperature sufficient to sinter said mixture.
Claim 9
Independent Claim
90 words
A method of manufacturing a member having an approximately uniform thermal expansion coefficient, comprising the steps of: providing molybdenum in the form of approximately -325 mesh powder; providing titanium in the form of approximately -325 mesh powder; providing approximately 0.01 to 5 weight percent of oxygen in the form of oxide, or boron, or a mixture thereof; mixing the foregoing components in an inert atmosphere; pressing the resulting mixture into a desired shape; and heating the pressed mixture in an inert atmosphere to a temperature sufficient to sinter said mixture.
Claim 10
Dependent Claim
16 words
The method of claim 7 wherein approximately 0.025 to 0.5 weight percent of boron is provided.
Claim 11
Dependent Claim
16 words
The method of claim 7 wherein said boron is provided in the form of elemental boron.
Claim 12
Dependent Claim
16 words
The method of claim 7 wherein said boron is provided in the form of Ti boride.
Claim 13
Dependent Claim
16 words
The method of claim 7 wherein said boron is provided in the form of Mo boride.
Claim 14
Dependent Claim
16 words
The method of claim 7 wherein approximately 1 to 2.5 weight percent of oxygen is provided.
Claim 15
Dependent Claim
25 words
The method of claim 7 wherein said oxygen is provided in the form of an oxide on the surface of said powdered titanium or molybdenum.
Claim 16
Dependent Claim
16 words
The method of claim 7 wherein said oxygen is provided in the form as titanium dioxide.
Claim 17
Dependent Claim
25 words
The method of claim 7 in which there is also provided prior to sintering approximately 1 weight percent of nickel, cobalt, copper, or mixtures thereof.
Claim 18
Dependent Claim
16 words
The method of claim 15 wherein approximately 0.025 to 0.5 weight percent of boron is provided.
Claim 19
Dependent Claim
16 words
The method of claim 15 wherein said boron is provided in the form of elemental boron.
Claim 20
Dependent Claim
16 words
The method of claim 15 wherein said boron is provided in the form of Ti boride.
Claim 21
Dependent Claim
16 words
The method of claim 15 wherein said boron is provided in the form of Mo boride.
Claim 22
Dependent Claim
16 words
The method of claim 15 wherein approximately 1 to 2.5 weight percent of oxygen is provided.
Claim 23
Dependent Claim
25 words
The method of claim 15 wherein said oxygen is provided in the form of an oxide on the surface of said powdered titanium or molybdenum.
Claim 24
Dependent Claim
16 words
The method of claim 15 wherein said oxygen is provided in the form of titanium dioxide.
Claim 25
Dependent Claim
65 words
A sealed assembly comprised of a ceramic tube having two ends; at least one member hermetically sealed to one of asid ends, said member a sintered composition of molybdenum in the form of approximately -325 mesh powder, titanium in the form of approximately -325 mesh powder, and approximately 0.01 to 5 weight percent of oxygen in the form of oxide, or boron, or mixtures thereof.
Claim 26
Dependent Claim
65 words
A sealed assembly comprised of a ceramic tube having two ends; at least one member hermetically sealed to one of asid ends, said member a sintered composition of molybdenum in the form of approximately -325 mesh powder, titanium in the form of approximately -325 mesh powder, and approximately 0.01 to 5 weight percent of oxygen in the form of oxide, or boron, or mixtures thereof.
Claim 27
Dependent Claim
18 words
The sealed assembly of claim 23 wherein said sintering aid is approximately 0.025 to 0.5 weight percent boron.
Claim 28
Dependent Claim
18 words
The sealed assembly of claim 23 wherein said sintering aid is approximately 1 to 2.5 weight percent oxygen.
Claim 29
Dependent Claim
20 words
The sealed assembly of claim 23 which further includes approximately 1 weight percent of nickel, cobalt, copper, or mixtures thereof.
Claim 30
Dependent Claim
18 words
The sealed assembly of claim 26 wherein said sintering aid is approximately 0.025 to 0.5 weight percent boron.
Claim 31
Dependent Claim
18 words
The sealed assembly of claim 26 wherein said sintering aid is approximately 1 to 2.5 weight percent oxygen.
References Cited (Backward Citations)
US4334628A
Cited
US4366410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |