US4419161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing composite ceramic articles
Assignee: Stemcor Corp
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Filing: 1981-12-18
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Granted: 1983-12-06
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Expires: 2001-12-18
Abstract
Abstract In accord with the present invention, a composite ceramic article may be produced by joining separate components of ceramic materials with a cement or brazing compound of finely-divided metal borides, such as Mo 2 B 5 , MoB 2 , TiB 2 , GeB 2 , ZrB 2 , SmB 6 , NbB 2 , HfB, VB 2 , WB 2 or TaB 2 . A particularly useful metal boride for use with silicon carbide is Mo 2 B 5 . If the metal carbide parts or components to be joined are sintered, the metal boride cement is selected to have a melting point within 150° C., but less than the sintering temperature of the metal carbide. If the metal carbide parts or components to be joined are unsintered, or an unsintered component is to be joined to a sintered component, the metal boride cement is selected to have a melting point slightly higher than the sintering temperature of the metal carbide components to be joined.
Inventors
- 👤 Laurence N. Hailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:29
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/003; C04B37/005; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/08; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/365; C04B2237/50; C04B2237/60; C04B2237/70; C04B2237/708
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
59 words
A method of joining separate silicon carbide components to form a composite article comprising the steps of: (a) coating the face of at least one of the components to be joined with molybdenum boride having the formula Mo 2 B 5 , (b) pressing the surfaces to be joined together, and (c) firing to produce a composite sintered article.
Claim 2
Independent Claim
59 words
A method of joining separate silicon carbide components to form a composite article comprising the steps of: (a) coating the face of at least one of the components to be joined with molybdenum boride having the formula Mo 2 B 5 , (b) pressing the surfaces to be joined together, and (c) firing to produce a composite sintered article.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the coating in step (a) is from about 0.08 to about 0.15 mm thick.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein the Mo 2 B 5 is formed in situ from powdered boron and powdered molybdenum metal.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein the Mo 2 B 5 is dispersed in a temporary binder selected from the group of waxes, thermoplastic resins, gums, polyvinyl alcohols, methyl cellulose, thermosetting resins or mixtures thereof.
Claim 6
Dependent Claim
12 words
The method of claim 4 wherein the temporary binder is methyl cellulose.
Claim 7
Dependent Claim
24 words
The method of claim 4 wherein the temporary binder mixture contains between about 50 and 90 percent by weight Mo 2 B 5 .
Claim 8
Dependent Claim
15 words
The method of claim 1 wherein the Mo 2 B 5 is formed in situ.
Claim 9
Dependent Claim
22 words
The method of claim 7 wherein the Mo 2 B 5 is formed in situ from powdered boron and powdered molybdenum hydride.
Claim 10
Dependent Claim
23 words
The method of claim 7 wherein the Mo 2 B 5 is formed from powdered boron, powdered molybdenum oxide and a carbon source.
Claim 11
Dependent Claim
13 words
The method of claim 9 wherein the carbon source is a phenolic resin.
Claim 12
Independent Claim
122 words
A method of joining separate metal carbide components to form a composite article comprising the steps of: (a) coating the face of at least one of the components to be joined with a metal boride selected from the group of Mo 2 B 5 , MoB 2 , TiB 2 , GeB 2 , ZrB 2 , SmB 6 , NbB 2 , HfB, VB 2 , TaB 2 and mixtures thereof, (b) pressing the surfaces to be joined together, and (c) firing to produce a composite sintered article; wherein the components to be joined are in sintered form and the firing is carried out at a temperature less than, but within 150° C. of, the sintering temperature of the metal carbide.
Claim 13
Independent Claim
122 words
A method of joining separate metal carbide components to form a composite article comprising the steps of: (a) coating the face of at least one of the components to be joined with a metal boride selected from the group of Mo 2 B 5 , MoB 2 , TiB 2 , GeB 2 , ZrB 2 , SmB 6 , NbB 2 , HfB, VB 2 , TaB 2 and mixtures thereof, (b) pressing the surfaces to be joined together, and (c) firing to produce a composite sintered article; wherein the components to be joined are in sintered form and the firing is carried out at a temperature less than, but within 150° C. of, the sintering temperature of the metal carbide.
Claim 14
Dependent Claim
12 words
The method of claim 11 wherein the metal carbide is silicon carbide.
Claim 15
Dependent Claim
15 words
The method of claim 12 wherein the metal boride is Mo 2 B 5 .
Claim 16
Independent Claim
120 words
A method of joining separate metal carbide components to form a composite article comprising the steps of: (a) coating the face of at least one of the components to be joined with a metal boride selected from the group of Mo 2 B 5 , MoB 2 , TiB 2 , GeB 2 , ZrB 2 , SmB 6 , NbB 2 , HfB, VB 2 , TaB 2 and mixtures thereof, (b) pressing the surfaces to be joined together, and (c) firing to produce a composite sintered article; wherein at least one of said components to be joined is comprised of unsintered metal carbide and the firing step is carried out at the sintering temperature for said metal carbide.
Claim 17
Independent Claim
120 words
A method of joining separate metal carbide components to form a composite article comprising the steps of: (a) coating the face of at least one of the components to be joined with a metal boride selected from the group of Mo 2 B 5 , MoB 2 , TiB 2 , GeB 2 , ZrB 2 , SmB 6 , NbB 2 , HfB, VB 2 , TaB 2 and mixtures thereof, (b) pressing the surfaces to be joined together, and (c) firing to produce a composite sintered article; wherein at least one of said components to be joined is comprised of unsintered metal carbide and the firing step is carried out at the sintering temperature for said metal carbide.
Claim 18
Dependent Claim
12 words
The method of claim 14 wherein the metal carbide is silicon carbide.
Claim 19
Dependent Claim
15 words
The method of claim 15 wherein the metal boride is Mo 2 B 5 .
References Cited (Backward Citations)
US2806800A
Cited
US3657592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |