US 6,187,123 B1 · Method for producing a lightened SiC sandwich type structure with a honeycomb-shaped core and structure obtained by said method

Abstract

The present invention concerns a method for producing a lightened SiC structure, especially for the production of a lightened mirror, with the following stages: cutting of a preform with a honeycomb-shaped structure whose voiles have an organic matrix and a fibrous reinforcement, pyrolysis of this honeycomb-shaped structural preform so as to solely preserve the carbon, silicidation of the carbon of the preform so as to obtain a microporous SiC core, infiltrating type reinforcement by means of a SiC chemical vapor phase depositing of the voiles of the honeycomb structure of the core, embodiment of a felt sheet and assembling on at least one face of the core of the embodied sheet and densification of this sheet so as to obtain at least one SiC skin on the surface of the core. The invention also concerns the structure obtained.

Claims20

Dependent claims

A method of making a SiC lightened structure comprising:

cutting a honeycomb structure having two faces into a desired shape while taking into account any possible shrinkages, the honeycomb structure having cell walls forming honeycomb cells, the cell walls being composed of an organic matrix and fibrous reinforcement;
pyrolyzing the honeycomb structure to form a preform comprising vitreous carbon;
siliciding the preform so as to transform the vitreous carbon into a microporous SiC honeycomb core;
reinforcing the cell walls of the honeycomb core by chemical vapor deposition of SiC;
and
assembling a felt sheet on at least one face of the honeycomb core to cover the honeycomb cells, and densifying the felt sheet using SiC to obtain at least one SiC skin on a surface of the honeycomb core so as to form a SiC structure.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

09/176,915Filed 22 Oct 1998 · continuation

Priority

FR 95 0398429 Mar 1995

Granted

13 Feb 2001

Term ends

Not estimatedThe source records don’t support an estimate.

Classification23 codes

B32B 3/12
Characterised by a discontinuous layer, i.e. formed of separate pieces of material: characterised by a layer of regularly- arranged cells, e.g. a…
B32B 9/005
Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00: comprising one layer of ceramic…
B32B 9/047
Comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different…
B32B 18/00
Layered products essentially comprising ceramics

Method for producing a lightened SiC sandwich type structure with a honeycomb-shaped core and structure obtained by said method

Life of this patent

Method for producing a lightened SiC sandwich type structure with a honeycomb-shaped core and structure obtained by said method

Life of this patent

Abstract

Claims20