초록 ▼

A densified carbon matrix carbon fiber composite preform is made by vacuum molding an aqueous slurry of carbon fibers and carbonizable organic powder to form a molded part. The molded part is dried in an oven at 50.degree. C. for 14 hours and hot pressed at 2000 psi at 400.degree. C. for 3 hours. Th

A densified carbon matrix carbon fiber composite preform is made by vacuum molding an aqueous slurry of carbon fibers and carbonizable organic powder to form a molded part. The molded part is dried in an oven at 50.degree. C. for 14 hours and hot pressed at 2000 psi at 400.degree. C. for 3 hours. The hot pressed part is carbonized at 650.degree. C. under nitrogen for 3 hours and graphitized at 2400.degree. C. to form a graphitic structure in the matrix of the densified carbon matrix carbon fiber composite preform. The densified preform has a density greater than 1.1 g/cc.

대표청구항 ▼

[ What is claimed is:] [1.] A method of making a densified carbon matrix carbon fiber composite preform comprising the following steps:Step 1. providing an aqueous slurry comprising carbon fibers, carbonizable organic powder and a rigidizer, said rigidizer having a softening point temperature range

[ What is claimed is:] [1.] A method of making a densified carbon matrix carbon fiber composite preform comprising the following steps:Step 1. providing an aqueous slurry comprising carbon fibers, carbonizable organic powder and a rigidizer, said rigidizer having a softening point temperature range and a volatilization temperature range;Step 2. vacuum molding said slurry to form a molded part;Step 3. drying said molded part at a temperature greater than said softening point temperature range of said rigidizer and a temperature less than said volatilization temperature range of said rigidizer to form a dry rigidized molded part having said carbon fibers uniformly dispersed and randomly oriented therein;Step 4. hot pressing said dry rigidized molded part to form a hot pressed part; andStep 5. carbonizing said hot pressed part under an inert atmosphere for a time and temperature sufficient to form a densified carbon matrix carbon fiber composite preform.