Patent ID: 7001544

Claim:
A method for manufacturing carbon-carbon composites, comprising steps of: producing a mat selected from the group consisting of carbon fiber, carbon fabric, carbon sheet, and staple fiber; laminating at least three layers of said mat; producing a preform using laminated said mat with a needle punching method; performing a first thermal treatment process on the produced preform at a predetermined temperature; densifying the first-thermal-treated preform by a thermal gradient chemical vapor infiltration process and then by a liquid impregnation process to form a densified preform such that its density is increased to 1.55–1.65 g/cm 3 by the thermal gradient chemical vapor infiltration process and then is increased to 1.60–1.90 g/cm 3 by the liquid impregnation process; performing a second thermal treatment process on the densified preform; forming a predetermined shape out of the second thermal treated preform; and performing an oxidation resistant treatment process on the shaped preform.