Process for producing sandwich structures from fiber-reinforced ceramics
AssigneeDornier GmbH
InventorsRolf Ostertag, Tilman Haug, Richard Renz, Wolfgang Zankl
Life of this patent
Estimating the term…
Abstract
A process for the production of sandwich structures made of fiber-reinforced ceramics, the base substance of the ceramic matrix consisting of a Si-organic polymer and a ceramic or metallic powder. A cross-linking of the Si-organic polymer takes place under increased pressure and at an increased temperature. After the joining of the facings and the honeycomb core, the sandwich structure is pyrolysed to form a ceramic material.
Claims5
A process for the production of a sandwich structure with facings and a honeycomb core made of fiber-reinforced ceramics comprising the steps of:
- impregnating inorganic fibers or wovens with a slip comprising at least a Si-organic polymer and a ceramic or metallic powder;
- molding facings;
- molding a honeycomb core by placing or winding the impregnated woven or fibers on respective mold cores;
- partially cross-linking said at least a Si-organic polymer to form a preceramic matrix, by pressure and temperature treatment of said facings and said honeycomb core;
- removing said mold cores from said honeycomb core;
- joining said facings and said honeycomb core to form said sandwich structure by complete cross-linking of said Si-organic polymer of said preceramic matrix by means of pressure and temperature treatment;
- no-pressure pyrolysis for conversion of said preceramic matrix into a ceramic material.
A process for the production of a sandwich structure with facings and a honeycomb core made of fiber-reinforced ceramics comprising the steps of:
- impregnating inorganic fibers or wovens with a slip comprising at least a Si-organic polymer and a ceramic or metallic powder;
- molding facings and a honeycomb core by means of winding and laminating techniques;
- applying a first facing to said honeycomb core;
- partially cross-linking (curing) said at least a Si-organic polymer to form a preceramic matrix, by pressure and temperature treatment of said facing and said honeycomb core;
- applying a second facing to said honeycomb core to form said sandwich structure;
- complete cross-linking of said Si-organic polymer of said preceramic matrix by means of pressure and temperature treatment;
- and
- no-pressure pyrolysis for conversion of said preceramic matrix into a ceramic material.
A process for the production of a sandwich structure with facings and a honeycomb core made of fiber-reinforced ceramics comprising the steps of:
- impregnating inorganic fibers or wovens with a slip comprising at least a Si-organic polymer and a ceramic or metallic powder;
- molding facings and a honeycomb core by means of winding and laminating techniques;
- partially cross-linking (curing) said at least a Si-organic polymer to form a preceramic matrix, by pressure and temperature treatment of said facings and said honeycomb core;
- applying said facings to honeycomb core to form said sandwich structure;
- complete cross-linking of said Si-organic polymer of said preceramic matrix by means of pressure and temperature treatment;
- and
- no-pressure pyrolysis for conversion of said preceramic matrix into a ceramic material.
Dependencies are inferred from the claim text.