US3775138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory diboride materials
Assignee: Individual
•
Filing: 1971-12-22
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Granted: 1973-11-27
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Expires: 1991-12-22
Abstract
Abstract New and improved diboride materials containing TiB2, ZrB2, HfB2 or others are produced by adding about 15 percent to 50 percent by volume of SiC and C. Carbon is included in an amount between about 2 percent and 40 percent, preferably about 5 percent to about 30 percent and SiC between about 10 percent and about 45 percent, preferably about 15 percent to about 30 percent. Improved properties include, among others, lower fabrication temperature, grain size control, oxidation resistance, improved machinability, corrosion resistance to gases containing fluoride, strength, thermal stress resistance and the like; improvement is gained not only in comparison with the diboride itself, but also in comparison with the diboride and either SiC or C without the other.
Inventors
- 👤 E Clougherty
- 👤 D Kalish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:20
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/515; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/58078
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
13 words
The hot pressed diboride material of claim 1, wherein the diboride is TiB2.
Claim 2
Dependent Claim
13 words
The hot pressed diboride material of claim 1, wherein the diboride is ZrB2.
Claim 3
Dependent Claim
13 words
The hot pressed diboride material of claim 1, wherein the diboride is HfB2.
Claim 4
Dependent Claim
52 words
The hot pressed diboride material of claim 1, wherein the silicon carbide is included in an amount between about 15 per cent by volume and about 30 per cent by volume, and the carbon is included in an amount between about 5 per cent by volume and 30 per cent by volume.
Claim 5
Dependent Claim
14 words
The hot pressed diboride material of claim 5, wherein the diboride is zirconium diboride.
Claim 6
Dependent Claim
14 words
The hot pressed diboride material of claim 5, wheRein the diboride is titanium diboride.
Claim 7
Dependent Claim
14 words
The hot pressed diboride material of claim 5, wherein the diboride is hafnium diboride.
Claim 8
Dependent Claim
50 words
As a new hot pressed diboride material of improved machinability and improved high temperature properties a mixture consisting essentially of about 72 volume per cent zirconium diboride, about 19 volume per cent silicon carbide and about 10 volume per cent carbon, said mixture fabricated by pressing at an elevated temperature.
Claim 9
Dependent Claim
49 words
As a new hot pressed diboride material of improved machinability and improved high temperature properties a mixture consisting essentially of about 56 volume per cent zirconium diboride, 14 volume per cent silicon carbide and about 30 volume per cent carbon, said mixture fabricated by pressing at an elevated temperature.
Claim 10
Dependent Claim
96 words
A machinable formed diboride refractory article having improved high temperature characteristics consisting essentially of a shaped hot pressed mixture of at least 50 percent by volume, based on the amount of solids, of a metal diboride of Ti, Zr, Hf, Nb, or Ta, about 15 percent to 50 percent by volume of two materials silicon carbide and carbon, the silicon carbide being in an amount between about 10 percent by volume and about 45 percent by volume, and the carbon being in an amount between about 2 percent by volume and about 40 percent by volume.
Claim 11
Dependent Claim
51 words
A machinable formed diboride according to claim 11, wherein the silicon carbide is in an amount between about 15 per cent by volume and about 30 per cent by volume, and the carbon is in an amount between about 5 per cent by volume and about 30 per cent by volume.
Claim 12
Dependent Claim
14 words
A machinable formed diboride according to claim 12, wherein the diboride is zirconium diboride.
References Cited (Backward Citations)
US2814566A
Cited
US3433471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |