초록 ▼

A method for manufacturing carbon-carbon composites includes steps of producing a mat using carbon fiber, carbon fabric, carbon sheet, or staple fiber; laminating at least three layers of mats; producing a preform using the laminated mats with a needle punching method; performing a first thermal tre

A method for manufacturing carbon-carbon composites includes steps of producing a mat using carbon fiber, carbon fabric, carbon sheet, or staple fiber; laminating at least three layers of mats; producing a preform using the laminated mats 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; 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 of the shaped preform.

대표청구항 ▼

What is claimed is: 1. 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

What is claimed is: 1. 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/cm3 by the thermal gradient chemical vapor infiltration process and then is increased to 1.60-1.90 g/cm3 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. 2. The method for manufacturing carbon-carbon composites as claimed in claim 1, wherein the predetermined temperature of the first thermal treatment process is 700~2000째 C. 3. The method for manufacturing carbon-carbon composites as claimed in claim 1, wherein said carbon fiber is one selected from the group consisting of oxi-PAN-based fiber, PAN-based fiber, rayon-based fiber, and pitch-based fiber. 4. The method for manufacturing carbon-carbon composites as claimed in claim 1, wherein the oxidation-resistant-treated preform has a carbon fiber volume ratio of 10~40%. 5. The method for manufacturing carbon-carbon composites as claimed in claim 1, wherein the thickness of said mat is 0.1~2.0 mm. 6. The method for manufacturing carbon-carbon composites as claimed in claim 1, wherein the carbon fiber reinforced with a z-axis has a length of 1~10 mm. 7. The method for manufacturing carbon-carbon composites as claimed in claim 1, wherein the mat lamination is semi-isotropic. 8. The method for manufacturing carbon-carbon composites as claimed in claim 1, wherein said second thermal treatment process is performed at a temperature of 1500~2800째 C. 9. The method for manufacturing carbon-carbon composites as claimed in claim 1, wherein the oxidation resistant treatment process comprises a coating step performed using a chemical composition mixed with B, BN, H3PO4, Mn(H3PO4)22H 2O, KOH, SiO2, and NH3. 10. The method for manufacturing carbon-carbon composites of claim 1, wherein said oxidation resistant treatment is cured and thermal-treated within the range of 200~1200째 C.