초록 ▼

Disclosed herein is a method of manufacturing a high-density fiber reinforced ceramic composite material, including the steps of: 1) impregnating a fiber preform material multi-coated with pyrolytic carbon and silicon carbide to form impregnated fiber reinforced plastic composite material; 2)carboni

Disclosed herein is a method of manufacturing a high-density fiber reinforced ceramic composite material, including the steps of: 1) impregnating a fiber preform material multi-coated with pyrolytic carbon and silicon carbide to form impregnated fiber reinforced plastic composite material; 2)carbonizing the impregnated fiber reinforced plastic composite material to form carbonized fiber composite material; 3) a primary reaction-sintering of the fiber composite material; 4) cooling the primarily reaction-sintered fiber composite material down to room temperature and then impregnating the primarily reaction-sintered fiber composite material with a solution in which a polymer precursor for producing silicon carbide (SiC) is dissolved in a hexane (n-hexane) solvent; and 5) a secondary reaction-sintering of the fiber composite material; and a high-density fiber reinforced ceramic composite material manufactured using the method.

대표청구항 ▼

1. A method of manufacturing a high-density fiber reinforced ceramic composite material, comprising the steps of: 1) impregnating a fiber preform material multi-coated with pyrolytic carbon and silicon carbide with a slurry in which a phenol resin is mixed with a filler including carbon powder and m

1. A method of manufacturing a high-density fiber reinforced ceramic composite material, comprising the steps of: 1) impregnating a fiber preform material multi-coated with pyrolytic carbon and silicon carbide with a slurry in which a phenol resin is mixed with a filler including carbon powder and metal silicon powder, to form a impregnated fiber reinforced plastic composite material;2) carbonizing the impregnated fiber reinforced plastic composite material to form a carbonized fiber composite material;3) heat-treating the carbonized fiber composite material in a vacuum atmosphere to melt the filler and then diffusing the molten filler into the carbonized fiber composite material to obtain a primarily reaction-sintered fiber composite material, as a primary reaction-sintering of the fiber composite material;4) cooling the primarily reaction-sintered fiber composite material down to room temperature and then impregnating the primarily reaction-sintered fiber composite material with a solution in which a polymer precursor for producing silicon carbide (SiC) is dissolved in a hexane (n-hexane) solvent; and5) applying metal silicon powder onto the surface of the primarily reaction-sintered fiber composite material impregnated with the polymer precursor to bring the metal silicon powder into contact with the primarily reaction-sintered fiber composite material, melting the metal silicon powder in a vacuum atmosphere and then diffusing the molten metal silicon powder into the primarily reaction-sintered fiber composite material to obtain a secondarily reaction-sintered fiber composite material, as a secondary reaction-sintering of the fiber composite material. 2. The method according to claim 1, wherein, in step 1), the multi-coating of the fiber preform material is performed by coating the fiber preform material with pyrolytic carbon in an atmosphere including propane gas and nitrogen gas at a volume ratio of 1:10˜10:1 and then further coating the fiber preform material with silicon carbide in an atmosphere including propane gas and monosilane (SiH4) gas at a volume ratio of 3:˜1:3. 3. The method according to claim 1, wherein, in step 1), the filler is mixed with the phenol resin in an amount of 5˜40 parts by weight based on 100 parts by weight of the phenol resin. 4. The method according to claim 3, wherein, in step 1), the filler includes carbon powder and metal silicon powder in a weight ratio of 1:6˜6:1. 5. The method according to claim 1, wherein, in step 1), the impregnating of the fiber preform material is performed by any one selected from vacuum assisted resin transfer molding (VARTM), resin transfer molding (RTM) and vacuum impregnation (VI). 6. The method according to claim 1, further comprising the step of curing the impregnated fiber reinforced plastic composite material at 80˜150° C. after step 1). 7. The method according to claim 1, wherein, in step 2), the carbonizing of the impregnated fiber reinforced plastic composite material is performed by heating the impregnated fiber reinforced plastic composite material from room temperature to 1000° C. or lower at a heating rate of 1˜2° C./min in an atmosphere including nitrogen. 8. The method according to claim 1, wherein, in step 3), the primary reaction-sintering of the fiber composite material is performed by heating the carbonized fiber composite material to 1500° C. or lower at a heating rate of 1˜7° C./min in a vacuum atmosphere to form a heated and carbonized fiber composite material and then sintering the heated and carbonized fiber composite material for 10˜60 minutes. 9. The method according to claim 1, wherein, in step 4), the polymer precursor for producing silicon carbide (SiC) is polycarbosilane. 10. The method according to claim 1, wherein, in step 5), the secondary reaction-sintering of the fiber composite material is performed by heating the primarily reaction-sintered fiber composite material from room temperature to 1650° C. or lower at a heating rate of 1˜7° C./min, heat-treating the heated fiber composite material for 10˜30 minutes and then sintering the heat-treated fiber composite material for 10˜60 minutes. 11. The method according to claim 1, wherein the fiber preform material is a carbon fiber or a silicon carbide fiber.