EP0227283A2
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EP
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High-purity silicon nitride fibers and process for producing same
Assignee: Tonen General Sekiyu KK
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Filing: 1986-11-11
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Granted: —
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Expires: 2006-11-11
Abstract
Abstract Dense, void-free and crack-free silicon nitride continuous fibers are provided having a carbon content of 5% by weight or less and similar amorphous silicon nitride short fibers having a carbon content of 5% by weight or less are provided. Such fibers are obtained by spinning a starting material mainly comprising perhydropolysilazane, followed by firing the resultant fibers; the perhydropolysilazane preferably has a degree of polymerization of 15 to 40.
Inventors
- 👤 Mikiro Arai
- 👤 Hayato Nishii
- 👤 Osamu Funayama
- 👤 Takeshi Isoda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 12:21
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/10; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/589; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2913
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
15 words
Silicon nitride continuous fibers characterised by having a carbon content of 5 wt% or less.
Claim 2
Dependent Claim
15 words
Silicon nitride continuous fibers characterised by having a carbon content of 5 wt% or less.
Claim 3
Dependent Claim
31 words
Silicon nitride fibers according to claim 1, which have the following elementary composition: Silicon : 55 to 70 wt% Nitrogen : 25 to 40 wt% Carbon : 5 wt% or less
Claim 4
Dependent Claim
28 words
Silicon nitride fibers according to claim 1, wherein the carbon content is less than 1 wt% of the fibers, for example less than 0.1 wt% of the fibers.
Claim 5
Dependent Claim
15 words
Silicon nitride fibers according to any one of claims 1 to 3, which are amorphous.
Claim 6
Dependent Claim
16 words
Amorphous silicon nitride short fibers characterised by having a carbon content of 5 wt% or less.
Claim 7
Dependent Claim
16 words
Amorphous silicon nitride short fibers characterised by having a carbon content of 5 wt% or less.
Claim 8
Dependent Claim
30 words
Amorphous silicon nitride short fibers according to claim 5, wherein the carbon content is less than 1 wt% of the fibers, for example less than 0.1 wt% of the fibers.
Claim 9
Dependent Claim
24 words
A process for producing silicon nitride fibers, characterised in that a starting material mainly comprising perhydropolysilazane is spun and the resultant fibers are fired.
Claim 10
Dependent Claim
24 words
A process for producing silicon nitride fibers, characterised in that a starting material mainly comprising perhydropolysilazane is spun and the resultant fibers are fired.
Claim 11
Dependent Claim
43 words
A process according to claim 7, wherein one or more spinning agents are added to a solution of the starting material in an inert solvent to prepare a spinning solution having a desired spinnability and the solution is spun to form continuous fibers.
Claim 12
Dependent Claim
26 words
A process according to claim 7 or claim 8, wherein the firing is effected at a temperature of 700 to 1900°C to obtain silicon nitride fibers.
Claim 13
Dependent Claim
32 words
A process according to claim 7, 8 or 9, wherein the firing is effected at a temperature of 800 to 1300°C in an inert gas atmosphere, to obtain amorphous silicon nitride fibers.
References Cited (Backward Citations)
No citation records indexed.
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