Method of coating composite material parts with a refractory and/or metallic product

• US 5,246,649 A
• Filed: 06/19/1991
• Issued: 09/21/1993
• Est. Priority Date: 01/21/1986
• Status: Expired due to Fees

• Current Assignee: R. Alkan & Cie (FR)
• Original Assignee: R. Alkan & Cie (FR)
• Inventors: Coutin, Pierre F., Mattei, Jean-Pierre
• Primary Examiner(s): DERRINGTON, JAMES H
• Application Number:
  US07/717,849
• Time in Patent Office: 825 Days
• Field of Search: 264/60, 264/104, 264/241, 264/258
• US Class Current: 264/258
• CPC Class Codes: B29C 33/56 Coatings , e.g. enameled or galvanised; Releasing, lubricating or separating agents in-mould coating B29C37/0028; using or applying separating agents B29C37/0067
• CPC Class Codes: B29C 37/0032 the coating being applied upon the mould surface before introducing the moulding compound, e.g. applying a gelcoat B29C44/14 and B29C44/32 take precedence
• CPC Class Codes: B29C 41/08 Coating a former, core or other substrate by spraying or fluidisation, e.g. spraying powder spray-up of reinforcing fibres B29C70/305
• CPC Class Codes: B29K 2105/0809 Fabrics
• CPC Class Codes: B29K 2105/251 Particles, powder or granules expandable particles B29K2105/046
• CPC Class Codes: B29K 2503/06 Metal powders, metal carbides or the like
• CPC Class Codes: B29K 2705/00 Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts

Abstract

The method of coating composite material parts with a refractory and/or metallic product includes the successive steps which consist of applying to the walls of the polymerization mold a layer of a binder which is volatile or decomposable during the polymerization heating, projecting onto said walls at least one layer of said coating products, positioning the fiber and resin fabric layers inside the mold, carrying out polymerization under pressure by heating, and then removing from the mold.

Claims

1. A method of coating parts of composite material with a refractory and/or metallic coating product, said method including successive steps which comprise:

(a) treating walls of a polymerization mold with a non-transferable stripping agent which does not decompose at polymerization temperature;

(b) applying to said walls of the polymerization mold a layer of a binder which is volatile or decomposable during polymerization heating;

(c) projecting onto the walls of the polymerization mold at least one layer of a coating product in a refractory and/or metallic material;

(d) positioning polymerizable products comprising layers of a fiber and resin, fabric inside said polymerization mold;

(e) carrying out polymerization while said polymerizable products are under compression to produce a polymerized product, and

(f) removing said polymerized product from said mold.

2. The method as claimed in claim 1 wherein the layer of binder comprises a charge of the same material as the material of the coating roduct to be projected on the walls of the mold.

3. The method as claimed in claim 2, wherein the projected coating product is a refractory ceramic and the charge of the binder is formed by a powder or dispersion of a similar ceramic.

4. The method as claimed in claim 3, wherein the proportion by weight of ceramic in the binder is 0.05 to 5 parts for 1 part of binder.

5. The method as claimed in claim 1, wherein the binder is formed of polyvinyl alcohol.

6. The method as claimed in claim 5, wherein the polyvinyl alcohol is charged with alumina/titanium powder and the projected coating product is formed of blue corundum.

7. The method as claimed in claim 2 wherein the binder is formed of polyvinyl alcohol.

8. The method as claimed in claim 3 wherein the binder is formed of polyvinyl alcohol.

9. The method as claimed in claim 4 wherein the binder is formed of polyvinyl alcohol.

10. The method as claimed in claim 9 wherein the polyvinyl alcohol is charged with alumina/titanium powder and the projected coating product is formed of blue corundum.