Patent US4120731A successfully refreshed from Google Patents.
US4120731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making molten silicon infiltration reaction products and products made thereby
Assignee: General Electric Co
•
Filing: 1976-02-23
•
Granted: 1978-10-17
•
Expires: 1996-02-23
Abstract
Abstract Infiltration reaction products are provided of molten silicon and certain blends of particulated carbon and various particulated inorganic materials substantially unreactive to molten silicon, such as boron nitride particles. These molten silicon infiltration products of reaction are readily machinable and can be applied, or formed in-situ as contiguous layers on silicon carbide, or silicon-silicon carbide substrates, etc., to produce multilayer composites having an improved impact strength over the base refractory structure.
Inventors
- 👤 William B. Hillig
- 👤 Charles R. Morelock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:15
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/56; C04B35/565; C04B35/573; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486; Y10T428/16; Y10T428/163; Y10T428/164; Y10T428/166; Y10T428/30; Y10T442/00; Y10T442/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
Machinable castings having a density of from 1.6 to 2.7 g/cm 3 which are the infiltration products of reaction under vacuum conditions and at a temperature of from 1400° C to 1700° C of molten silicon and a substantially uniform mixture consisting essentially of by volume (A) from 45% to 90% of particulated carbon having up to an equal proportion by volume based on the volume of (A) of silicon carbide particles, and (B) from 10% to 55% of particulated boron nitride.
Claim 2
Dependent Claim
82 words
Machinable castings having a density of from 1.6 to 2.7 g/cm 3 which are the infiltration products of reaction under vacuum conditions and at a temperature of from 1400° C to 1700° C of molten silicon and a substantially uniform mixture consisting essentially of by volume (A) from 45% to 90% of particulated carbon having up to an equal proportion by volume based on the volume of (A) of silicon carbide particles, and (B) from 10% to 55% of particulated boron nitride.
Claim 3
Dependent Claim
19 words
A machinable casting in accordance with claim 1, where the particulated carbon is in the form of carbon fiber.
Claim 4
Dependent Claim
26 words
A particulated casting in accordance with claim 1, where the particulated carbon is in the form of a mixture of carbon fiber and silicon carbide particles.
References Cited (Backward Citations)
GB713710A
Cited
US2887393A
Cited
US3035325A
Cited
US3246275A
Cited
US3364975A
Cited
US3796564A
Cited
US3725015A
Cited
US3649432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |