US4104442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon nitride-containing material with self-glazing surface and process for its production
Assignee: Rosenthal AG
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Filing: 1976-03-23
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Granted: 1978-08-01
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Expires: 1996-03-23
Abstract
Abstract The invention concerns a silicon nitride-containing material with a gas-tight surface and improved oxidation resistance, and the invention also relates to a process for the production of such material.
Inventors
- 👤 Godehard Sussmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:15
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/591; C04B41/45; C04B41/50; C04B41/5022
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A process for the production of a silicon nitride-containing material with a gas-tight surface and improved oxidation resistance which comprises admixing 3-25 percent by weight based on the weight of the resulting admixture of at least one powdered ceramic, silicate-containing additive having a particle size of less than 20 mμ and the silicon raw material, subjecting the admixture to standard nitriding condition and subjecting the nitrided admixture to a heat treatment between 1,000° C and 1,500° C in an oxygen-containing atmosphere, wherein said admixture is heated to said temperature at a rate exceeding 100° C per minute, nitride-containing material.
Claim 2
Dependent Claim
99 words
A process for the production of a silicon nitride-containing material with a gas-tight surface and improved oxidation resistance which comprises admixing 3-25 percent by weight based on the weight of the resulting admixture of at least one powdered ceramic, silicate-containing additive having a particle size of less than 20 mμ and the silicon raw material, subjecting the admixture to standard nitriding condition and subjecting the nitrided admixture to a heat treatment between 1,000° C and 1,500° C in an oxygen-containing atmosphere, wherein said admixture is heated to said temperature at a rate exceeding 100° C per minute, nitride-containing material.
Claim 3
Dependent Claim
23 words
Process for the production of a silicon nitride-containing material according to claim 1, characterized in that the heat treatment is effected in air.
Claim 4
Dependent Claim
29 words
Process for the production of a silicon nitride-containing material according to claim 1, characterized in that the additive is magnesium aluminum silicate in an amount of 10-15 weight percent.
Claim 5
Dependent Claim
26 words
Process for the production of a silicon nitride-containing material according to claim 1, characterized in that lithium aluminum silicate is an amount of 5-10 weight percent.
Claim 6
Dependent Claim
21 words
A silicon nitride-containing body having a gas tight surface and improved resistance to oxidation produced by the process of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |