Highly heat-resistant composite material with excellent formability and production method thereof
US-2016326399-A1 · Nov 10, 2016 · US
Method for the treatment of silicon carbide fibres
US9574299B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9574299-B2 |
| Application number | US-201314394127-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 11, 2013 |
| Priority date | Apr 13, 2012 |
| Publication date | Feb 21, 2017 |
| Grant date | Feb 21, 2017 |
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- Title
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Abstract
Official abstract text for this publication.
The invention relates to a method for the treatment of silicon carbide fibers, comprising a step involving the chemical treatment of fibers with an aqueous acid solution containing hydrofluoric acid and nitric acid but free of acetic acid in order to remove the silica present on the surface of fibers and to form a layer of microporous carbon. The invention also relates to a method for the production of a fibrous preform, comprising the formation of a fibrous structure comprising treated silicon carbon fibers and the use of said preform for the production of a part made from composite material.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for the treatment of silicon carbide fibers, comprising the step of chemical treatment of the fibers with an aqueous acid solution containing hydrofluoric acid and nitric acid in order to remove the silica present at the surface of the fibers and to form a layer of microporous carbon, wherein said aqueous acid solution does not contain acetic acid and wherein the aqueous acid solution contains a hydrofluoric acid content of between 0.5 and 4 mol/l. 2. The process as claimed in claim 1 , wherein the aqueous acid solution contains a hydrofluoric acid/nitric acid molar ratio of less than 1.5. 3. The process as claimed in claim 1 , wherein the aqueous acid solution contains a nitric acid content of between 0.5 and 5 mol/l. 4. The process as claimed in claim 1 , wherein the chemical treatment step is carried out at ambient temperature and lasts four hours. 5. The process as claimed in claim 1 , wherein the fibers obtained have a superficial layer of microporous carbon ≦100 nm. 6. The process as claimed claim 1 , wherein the fibers are covered with a sizing not removable by chemical treatment, and in that the process comprises the prior step of virtually completely removing said sizing by heat treatment. 7. The process as claimed in claim 1 , wherein it comprises the additional step of depositing a layer of pyrolytic carbon on the silicon carbon fibers treated.
Assignees
Inventors
Classifications
based on silicon carbide (C04B35/571 takes precedence) · CPC title
Silicon carbide · CPC title
by gas phase techniques · CPC title
with halogen acids or salts thereof · CPC title
based on silicon carbide · CPC title
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- What does patent US9574299B2 cover?
- The invention relates to a method for the treatment of silicon carbide fibers, comprising a step involving the chemical treatment of fibers with an aqueous acid solution containing hydrofluoric acid and nitric acid but free of acetic acid in order to remove the silica present on the surface of fibers and to form a layer of microporous carbon. The invention also relates to a method for the produ…
- Who is the assignee on this patent?
- Herakles
- What technology area does this patent fall under?
- Primary CPC classification D06M11/74. Mapped technology areas include Textiles & Paper.
- When was this patent published?
- Publication date Tue Feb 21 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).