KR102759454B1 - CNTf_Cf/SiC composite and method for manufacturing the same - Google Patents
CNTf_Cf/SiC composite and method for manufacturing the same Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 13
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 62
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 62
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 37
- 239000004744 fabric Substances 0.000 claims abstract description 26
- 239000000835 fiber Substances 0.000 claims abstract description 26
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 21
- 239000004917 carbon fiber Substances 0.000 claims abstract description 21
- 239000012779 reinforcing material Substances 0.000 claims abstract description 20
- 239000002243 precursor Substances 0.000 claims abstract description 12
- 238000010030 laminating Methods 0.000 claims abstract description 8
- 238000010000 carbonizing Methods 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims description 8
- 238000009941 weaving Methods 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229910018540 Si C Inorganic materials 0.000 claims description 2
- 229910018557 Si O Inorganic materials 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910021431 alpha silicon carbide Inorganic materials 0.000 claims description 2
- -1 polysiloxane Polymers 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 2
- 239000012700 ceramic precursor Substances 0.000 claims 1
- 239000010419 fine particle Substances 0.000 claims 1
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 description 8
- 238000003763 carbonization Methods 0.000 description 7
- 238000005470 impregnation Methods 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002783 friction material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 101150030072 CNTF gene Proteins 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000012705 liquid precursor Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
- C04B35/571—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide obtained from Si-containing polymer precursors or organosilicon monomers
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- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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Abstract
본 발명은 탄소섬유_CNT섬유_혼합프리프레그를 설정된 개수만큼 적층하여 보강재를 만들고, 이러한 보강재에 전구체 용액을 함침시키고 탄화시키는 것을 반복하여, 탄화규소 기재가 보강재로 강화된 Cf/SiC 복합재를 만든다. 이렇게 제조된 Cf/SiC 복합재는, 직물형태로 잘 짜인 탄소섬유가 균열의 진행을 1차적으로 막고, 직물형태로 잘 짜인 CNT섬유가 균열의 진행을 최종적으로 막아준다. 따라서, 충격으로 인해 Cf/SiC 복합재의 내외부에 균열이 생겨도, 최초 균열을 기점으로 균열이 더 이상 퍼져나가지 못하고 저지되거나 굴절된다. 따라서, 본 발명을 사용하면, 내구성, 방열성, 내산화성은 물론, 파괴인성까지 우수한 Cf/SiC 복합재를 제조할 수 있다.The present invention manufactures a Cf/SiC composite in which a silicon carbide substrate is reinforced as a reinforcing material by laminating a set number of carbon fiber_CNT fiber_mixed prepregs, and repeatedly impregnating the reinforcing material with a precursor solution and carbonizing it. In the Cf/SiC composite manufactured in this way, the carbon fibers woven in a fabric form primarily block the propagation of cracks, and the CNT fibers woven in a fabric form ultimately block the propagation of cracks. Therefore, even if a crack occurs inside or outside the Cf/SiC composite due to an impact, the crack does not spread any further from the initial crack but is stopped or refracted. Therefore, by using the present invention, it is possible to manufacture a Cf/SiC composite having excellent durability, heat dissipation, oxidation resistance, and even fracture toughness.
Description
본 발명은 CNTf_Cf/SiC 복합재 및 이를 제조하는 방법에 관한 것이다.The present invention relates to a CNTf_Cf/SiC composite and a method for manufacturing the same.
Cf/SiC 복합재는 탄화규소 기지(matrix)에 탄소섬유가 첨가되어 강화된 소재다. Cf/SiC 복합재는 내구성, 방열성, 내산화성이 우수하므로, 마찰재, 방탄재, 내열재 등 여러 분야에서 사용되고 있다.Cf/SiC composites are materials that are reinforced by adding carbon fibers to a silicon carbide matrix. Cf/SiC composites have excellent durability, heat dissipation, and oxidation resistance, so they are used in various fields such as friction materials, bulletproof materials, and heat-resistant materials.
이러한 Cf/SiC 복합재의 제조방법으로, 반 경화 상태인 페놀수지에 짧은 탄소섬유를 넣어 혼합하고 가압 및 가열하여 성형체(green body)로 만들고, 이 성형체를 900℃로 탄화한 후, 탄화된 성형체의 기공안으로 분말 형태의 1410℃로 탄화규소를 녹여 함침시키는 방법이 있다. 그러면, 페놀수지로부터 공급된 탄소와 탄화규소가 공유결합하여 탄화규소로 구성된 기지(matrix)가 만들어지며 이 기지에 탄소섬유가 무작위로 분포된 Cf/SiC 복합재가 만들어진다.A method for manufacturing such a Cf/SiC composite includes mixing short carbon fibers into a semi-cured phenolic resin, pressurizing and heating to form a molded body (green body), carbonizing this molded body at 900°C, and then impregnating silicon carbide in powder form at 1410°C into the pores of the carbonized molded body. Then, the carbon supplied from the phenolic resin and silicon carbide covalently bond to form a matrix composed of silicon carbide, and a Cf/SiC composite in which carbon fibers are randomly distributed is created.
이렇게 제조된 Cf/SiC 복합재는, 내구성, 방열성, 내산화성이 우수하다. 그러나, 외부 충격이 가해질 때 변형이 매우 작아 쉽게 부서지는 성질을 가지고 있다.The Cf/SiC composite manufactured in this way has excellent durability, heat dissipation, and oxidation resistance. However, it has the property of being easily broken because its deformation is very small when an external impact is applied.
비록 탄소섬유로 탄화규소로 구성된 기지(matrix)가 강화되어 있다고 하나, 탄소섬유는 전단력에 약해 탄소섬유의 길이방향이 아닌 단면 방향으로 균열이 지나갈 경우에는 절단되어, 균열의 번짐을 차단하지 못한다.Although the matrix composed of silicon carbide is reinforced with carbon fibers, carbon fibers are weak to shear force, so if a crack passes in the cross-sectional direction rather than the longitudinal direction of the carbon fibers, it is cut and does not prevent the crack from spreading.
이렇게 충격으로 인해 Cf/SiC 복합재의 내외부에 작은 균열이 생기면, 최초 균열을 기점으로 균열이 급속도로 퍼져나가, 결국 Cf/SiC 복합재가 부서지는 경우가 자주 발생하고 있다.In this way, when small cracks occur inside and outside the Cf/SiC composite due to impact, the cracks spread rapidly from the initial crack, often resulting in the Cf/SiC composite breaking.
본 발명의 목적은 상술한 문제점을 해결할 수 있는 CNTf_Cf/SiC 복합재 및 이를 제조하는 방법에 관한 것이다.The purpose of the present invention is to provide a CNTf_Cf/SiC composite capable of solving the above-described problems and a method for manufacturing the same.
상기 목적을 달성하기 위한 CNTf_Cf/SiC 복합재는,To achieve the above purpose, the CNTf_Cf/SiC composite is
탄화규소 기지; 및Silicon carbide base; and
상기 탄화규소 기지를 보강하는 보강재로 구성되며,It is composed of a reinforcing material that reinforces the above silicon carbide base,
상기 보강재는,The above reinforcing material is,
탄소섬유와 CNT섬유를 직조하여 만든 탄소섬유_CNT섬유_혼합패브릭이, 설정된 개수만큼 적층되어 형성된 것을 특징으로 한다.It is characterized by being formed by laminating a carbon fiber_CNT fiber_blended fabric made by weaving carbon fiber and CNT fiber in a set number of layers.
또한, 상기 목적은,In addition, the above purpose is,
탄소섬유와 CNT섬유를 직조하여 만든 탄소섬유_CNT섬유_혼합패브릭을 설정된 개수만큼 준비하는 제1단계;Step 1: Prepare a set quantity of carbon fiber_CNT fiber_blended fabric made by weaving carbon fiber and CNT fiber;
상기 설정된 개수의 탄소섬유_CNT섬유_혼합패브릭에 탄화규소 슬러리를 함침시켜 설정된 개수의 탄소섬유_CNT섬유_혼합프리프레그를 제조하는 제2단계;A second step of manufacturing a set number of carbon fiber_CNT fiber_blended prepregs by impregnating the set number of carbon fiber_CNT fiber_blended fabrics with silicon carbide slurry;
상기 설정된 개수의 탄소섬유_CNT섬유_혼합프리프레그를 적층하여 보강재를 만드는 제3단계;A third step of making a reinforcing material by laminating the carbon fiber_CNT fiber_mixed prepreg in the above-mentioned number;
상기 보강재를 성형틀에 넣고 가압 및 가열하여 성형체로 만드는 제4단계;Step 4: placing the above reinforcing material into a mold and pressurizing and heating it to make a molded body;
상기 성형체를 비활성분위기에서 800~900℃로 탄화하여 탄화체로 만드는 제5단계;Step 5 of carbonizing the above-mentioned molded body at 800 to 900°C in an inert atmosphere to make a carbonized body;
상기 탄화체에 전구체 용액을 함침하는 제6단계; 및A sixth step of impregnating the above carbonized body with a precursor solution; and
상기 제5단계 및 상기 제6단계를 설정된 횟수만큼 반복하는 제7단계를 포함하는 것을 특징으로 하는 CNTf_Cf/SiC 복합재 제조방법에 의해 달성된다.This is achieved by a method for manufacturing a CNTf_Cf/SiC composite, characterized in that it includes a seventh step of repeating the fifth and sixth steps a set number of times.
본 발명은 탄소섬유_CNT섬유_혼합프리프레그를 설정된 개수만큼 적층하여 보강재를 만들고, 이러한 보강재에 전구체 용액을 함침시키고 탄화시키는 것을 반복하여, 탄화규소 기재가 보강재로 강화된 Cf/SiC 복합재를 만든다. 이렇게 제조된 Cf/SiC 복합재는, 직물형태로 잘 짜인 탄소섬유가 균열의 진행을 1차적으로 막고, 직물형태로 잘 짜인 CNT섬유가 균열의 진행을 최종적으로 막아준다. 따라서, 충격으로 인해 Cf/SiC 복합재의 내외부에 균열이 생겨도, 최초 균열을 기점으로 균열이 더 이상 퍼져나가지 못하고 저지되거나 굴절된다. 따라서, 본 발명을 사용하면, 내구성, 방열성, 내산화성은 물론, 파괴인성까지 우수한 Cf/SiC 복합재를 제조할 수 있다.The present invention manufactures a Cf/SiC composite in which a silicon carbide substrate is reinforced as a reinforcing material by laminating a set number of carbon fiber_CNT fiber_mixed prepregs, and repeatedly impregnating the reinforcing material with a precursor solution and carbonizing it. In the Cf/SiC composite manufactured in this way, the carbon fibers woven in a fabric form primarily block the propagation of cracks, and the CNT fibers woven in a fabric form ultimately block the propagation of cracks. Therefore, even if a crack occurs inside or outside the Cf/SiC composite due to an impact, the crack does not spread any further from the initial crack but is stopped or refracted. Therefore, by using the present invention, it is possible to manufacture a Cf/SiC composite having excellent durability, heat dissipation, oxidation resistance, and even fracture toughness.
본 발명은 보강재에 탄소섬유패브릭 대신, 탄소섬유와 CNT섬유를 직조하여 만든 탄소섬유_CNT섬유_혼합패브릭을 포함하고 있어, CNT섬유의 높은 강도로 인해, 탄소섬유패브릭만으로 구성된 Cf/SiC 복합재에 비해, 그 굽힘강도를 25% 이상 향상시킬 수 있다.The present invention includes a carbon fiber_CNT fiber_blended fabric made by weaving carbon fiber and CNT fiber instead of carbon fiber fabric as a reinforcing material, and due to the high strength of the CNT fiber, the bending strength can be improved by 25% or more compared to a Cf/SiC composite composed of only carbon fiber fabric.
본 발명은 보강재에 탄소섬유패브릭 대신, 탄소섬유와 CNT섬유를 직조하여 만든 탄소섬유_CNT섬유_혼합패브릭을 포함하고 있어, 일방향CNT섬유패브릭을 구성하는 CNT섬유의 높은 기공율로 인해 그 밀도가 작아져, Cf/SiC 복합재를 가볍게 만들 수 있다.The present invention includes a carbon fiber_CNT fiber_blended fabric made by weaving carbon fibers and CNT fibers instead of a carbon fiber fabric as a reinforcing material, so that the density is reduced due to the high porosity of the CNT fibers constituting the unidirectional CNT fiber fabric, and thus the Cf/SiC composite can be made lightweight.
도 1은 본 발명의 일 실시예에 따른 CNTf_Cf/SiC 복합재 제조방법을 나타낸 순서도다.
도 2는 탄소섬유_CNT섬유_혼합패브릭을 나타낸 도면이다.
도 3은 탄소섬유_CNT섬유_혼합프리프레그를 나타낸 도면이다.
도 4는 설정된 개수의 탄소섬유_CNT섬유_혼합프리프레그가 적층된 상태를 나타낸 도면이다.
도 5는 성형틀에 보강재를 넣고 가압 및 가열하여 성형체를 만드는 상태를 나타낸 도면이다.
도 6은 CNTf_Cf/SiC 복합재를 나타낸 도면이다.FIG. 1 is a flow chart showing a method for manufacturing a CNTf_Cf/SiC composite according to one embodiment of the present invention.
Figure 2 is a drawing showing a carbon fiber_CNT fiber_blended fabric.
Figure 3 is a drawing showing a carbon fiber_CNT fiber_mixed prepreg.
Figure 4 is a drawing showing a state in which a set number of carbon fiber_CNT fiber_mixed prepregs are laminated.
Figure 5 is a drawing showing a state in which a reinforcing material is placed in a mold and pressurized and heated to create a molded body.
Figure 6 is a drawing showing a CNTf_Cf/SiC composite.
이하, 본 발명의 일 실시예에 따른 CNTf_Cf/SiC 복합재 제조방법을 자세히 설명한다.Hereinafter, a method for manufacturing a CNTf_Cf/SiC composite according to one embodiment of the present invention will be described in detail.
도 1에 도시된 바와 같이, 본 발명의 일 실시예에 따른 CNTf_Cf/SiC 복합재 제조방법은,As illustrated in FIG. 1, a method for manufacturing a CNTf_Cf/SiC composite according to one embodiment of the present invention is as follows.
탄소섬유와 CNT섬유를 직조하여 만든 탄소섬유_CNT섬유_혼합패브릭을 설정된 개수만큼 준비하는 제1단계(S11);Step 1 (S11) of preparing a set number of carbon fiber_CNT fiber_blended fabrics made by weaving carbon fibers and CNT fibers;
상기 설정된 개수의 탄소섬유_CNT섬유_혼합패브릭에 탄화규소 슬러리를 함침시켜 설정된 개수의 탄소섬유_CNT섬유_혼합프리프레그를 제조하는 제2단계(S12);A second step (S12) of manufacturing a set number of carbon fiber_CNT fiber_blended prepregs by impregnating the set number of carbon fiber_CNT fiber_blended fabrics with silicon carbide slurry;
상기 설정된 개수의 탄소섬유_CNT섬유_혼합프리프레그를 적층하여 보강재를 만드는 제3단계(S13);A third step (S13) of making a reinforcing material by laminating the above-mentioned number of carbon fiber_CNT fiber_mixed prepregs;
상기 보강재를 성형틀에 넣고 가압 및 가열하여 성형체로 만드는 제4단계(S14);Step 4 (S14) of putting the above reinforcing material into a mold and pressing and heating it to make a molded body;
상기 성형체를 비활성분위기에서 800~900℃로 탄화하여 탄화체로 만드는 제5단계(S15);Step 5 (S15) of carbonizing the above-mentioned molded body at 800 to 900°C in an inert atmosphere to make a carbonized body;
상기 탄화체에 전구체 용액을 함침하는 제6단계(S16);Step 6 (S16) of impregnating the above carbonized body with a precursor solution;
상기 제5단계 및 상기 제6단계를 설정된 횟수만큼 반복하는 제7단계(S17)로 구성된다.It consists of a seventh step (S17) in which the fifth and sixth steps are repeated a set number of times.
이하, 제1단계(S11)를 설명한다.Below, Step 1 (S11) is described.
탄소섬유_CNT섬유_혼합패브릭Carbon fiber_CNT fiber_Mixed fabric
CNT섬유(탄소나노튜브 섬유)들을 풀어서 일정길이로 절단한다. CNT섬유는, 다른 슈퍼 섬유들에 비해 뛰어난 기계적 강도와 열전도성을 가지며, 밀도가 작아 가볍다. CNT섬유를 제조하는 방법은 다양할 수 있다.CNT fibers (carbon nanotube fibers) are released and cut to a certain length. CNT fibers have superior mechanical strength and thermal conductivity compared to other super fibers, and are lightweight due to their low density. There are various methods for manufacturing CNT fibers.
탄소섬유와 CNT섬유를 직조하여, 도 2에 도시된 바와 같은 탄소섬유_CNT섬유_혼합패브릭(10)을 만든다.By weaving carbon fibers and CNT fibers, a carbon fiber_CNT fiber_blended fabric (10) as shown in Fig. 2 is created.
설정된 두께를 가진 CNTf/Cf/SiC 복합재를 제조하기 위해, 설정된 개수의 탄소섬유_CNT섬유_혼합패브릭(10)을 준비한다.To manufacture a CNTf/Cf/SiC composite having a set thickness, a set number of carbon fiber_CNT fiber_blended fabrics (10) are prepared.
이하, 제2단계(S12)를 설명한다.Below, the second step (S12) is described.
탄소섬유_CNT섬유_혼합패브릭(10)에 탄화규소 슬러리를 함침시켜 도 3에 도시된 바와 같은 탄소섬유_CNT섬유_혼합프리프레그(20)를 설정된 개수만큼 제조한다.A carbon fiber_CNT fiber_mixed fabric (10) is impregnated with silicon carbide slurry to produce a set number of carbon fiber_CNT fiber_mixed prepregs (20) as shown in Fig. 3.
탄화규소 슬러리는 알파-실리콘 카바이드 내화 미립자로 채워진 폴리실록산 수지로 구성된다. 탄화규소 슬러리는 180°C ~ 325°C의 온도에서 경화되어 열경화성 수지를 형성하고, 850°C ~ 1,100°C의 온도에서 조밀한 SiC 기지를 형성한다.Silicon carbide slurry consists of a polysiloxane resin filled with alpha-silicon carbide refractory particles. The silicon carbide slurry cures at a temperature of 180°C to 325°C to form a thermosetting resin, and forms a dense SiC matrix at a temperature of 850°C to 1,100°C.
이하, 제3단계(S13)를 설명한다.Below, the third step (S13) is described.
도 4에 도시된 바와 같이, 설정된 개수의 탄소섬유_CNT섬유_혼합프리프레그(20)를 적층하여 보강재(30, 도 5 참조)를 만든다.As shown in Fig. 4, a set number of carbon fiber_CNT fiber_mixed prepregs (20) are laminated to create a reinforcing material (30, see Fig. 5).
탄소섬유_CNT섬유_혼합프리프레그(20)에 포함된 CNT섬유의 개수를 조절하면, CNTf_Cf/SiC 복합재의 강도를 조절할 수 있다. 이를 위해, 탄소섬유_CNT섬유_혼합패브릭(10)을 만들 때, 탄소섬유와 직조되는 CNT섬유의 개수를 조절한다.By controlling the number of CNT fibers included in the carbon fiber_CNT fiber_blended prepreg (20), the strength of the CNTf_Cf/SiC composite can be controlled. To this end, when making the carbon fiber_CNT fiber_blended fabric (10), the number of CNT fibers woven with the carbon fibers is controlled.
한편, 탄소섬유_CNT섬유_혼합프리프레그(20)의 적층 위치에 따라 탄소섬유_CNT섬유_혼합프리프레그(20)에 포함된 CNT섬유의 개수를 조절하면, CNTf_Cf/SiC 복합재의 부위별 강도를 조절할 수 있다. 예를 들어, 마찰재의 경우 충격을 흡수하기 위해 내부에는 CNT섬유의 개수가 적은 탄소섬유_CNT섬유_혼합프리프레그(20)를 적층하고, 표면은 마찰에 견디기 위해 CNT섬유의 개수가 많은 탄소섬유_CNT섬유_혼합프리프레그(20)를 적층할 수 있다.Meanwhile, by controlling the number of CNT fibers included in the carbon fiber_CNT fiber_mixed prepreg (20) depending on the lamination position of the carbon fiber_CNT fiber_mixed prepreg (20), the strength of each part of the CNTf_Cf/SiC composite can be controlled. For example, in the case of a friction material, a carbon fiber_CNT fiber_mixed prepreg (20) having a small number of CNT fibers can be laminated on the inside to absorb impact, and a carbon fiber_CNT fiber_mixed prepreg (20) having a large number of CNT fibers can be laminated on the surface to withstand friction.
이하, 제4단계(S14)를 설명한다.Below, step 4 (S14) is described.
보강재(30)를 성형틀(M)에 넣고 피스톤(P)으로 가압(5~8MPa)하고, 히터(미도시)로 가열(200~300℃)하여 성형체로 만든다. 히터는 성형틀(M)에 내장된다.A reinforcing material (30) is placed in a mold (M), pressurized (5 to 8 MPa) by a piston (P), and heated (200 to 300°C) by a heater (not shown) to form a molded body. The heater is built into the mold (M).
이하, 제5단계(S15)를 설명한다.Below, step 5 (S15) is described.
성형틀(M)에서 성형체를 꺼내 탄화로에 넣고, 비활성분위기에서 800~900℃로 탄화하여 탄화체로 만든다. 탄화로 내부를 비활성분위기를 만들기 위해 탄화로 내부에 질소를 투입한다. 탄화과정동안 탄화규소 슬러리로부터 SiC 기지가 형성된다.The molded body is taken out from the mold (M) and placed in a carbonization furnace, and carbonized at 800 to 900°C in an inert atmosphere to create a carbonized body. Nitrogen is injected into the carbonization furnace to create an inert atmosphere inside the carbonization furnace. During the carbonization process, a SiC matrix is formed from the silicon carbide slurry.
이하, 제6단계(S16)를 설명한다.Below, step 6 (S16) is described.
탄화로에서 탄화체를 꺼낸 후 함침틀에 넣고 전구체 용액을 함침시킨다. 함침은 상온에서 이루어진다. 전구체 용액은 열적으로 안정적인 실리콘 옥시카바이드 세라믹의 액체 전구체다. 전구체 용액은 저온에서 열경화성으로 경화되는 Si-C 및 Si-O 결합 구조를 모두 가진다.After taking the carbonized body out of the carbonization furnace, it is placed in an impregnation mold and impregnated with a precursor solution. Impregnation is performed at room temperature. The precursor solution is a liquid precursor of a thermally stable silicon oxycarbide ceramic. The precursor solution has both Si-C and Si-O bonding structures that are thermosetting at low temperatures.
이하, 제7단계(S17)를 설명한다.Below, step 7 (S17) is described.
전구체 용액이 함침된 탄화체를 다시 탄화로에 넣고 탄화한다. 이러한 전구체 용액 함침 및 탄화를 5~8회 반복한다. 반복되는 동안 전구체 용액으로부터 SiC 기지가 형성된다. 반복 회수를 조절하여, CNTf_Cf/SiC 복합재 (50)의 밀도를 조절할 수 있다.The carbonized body impregnated with the precursor solution is put back into the carbonization furnace and carbonized. This precursor solution impregnation and carbonization are repeated 5 to 8 times. During the repetition, a SiC matrix is formed from the precursor solution. By controlling the number of repetitions, the density of the CNTf_Cf/SiC composite (50) can be controlled.
상술한 제1단계(S11) 내지 제7단계(S17)를 거쳐, 도 6에 도시된 바와 같은, CNTf_Cf/SiC 복합재(40)가 제조된다.Through the first step (S11) to the seventh step (S17) described above, a CNTf_Cf/SiC composite (40) as shown in FIG. 6 is manufactured.
CNTf_Cf/SiC 복합재(40)는 탄화규소 기지와, 탄화규소 기지를 보강하는 보강재로 구성된다. CNTf_Cf/SiC 복합재(40)는 탄소섬유와 CNT섬유를 직조하여 만든 탄소섬유_CNT섬유_혼합패브릭(10)이, 설정된 개수만큼 적층되어 형성된다.The CNTf_Cf/SiC composite (40) is composed of a silicon carbide matrix and a reinforcing material that reinforces the silicon carbide matrix. The CNTf_Cf/SiC composite (40) is formed by laminating a set number of carbon fiber_CNT fiber_mixed fabrics (10) made by weaving carbon fibers and CNT fibers.
CNTf_Cf/SiC 복합재(40)의 CNT섬유로 인해, 내부에 균열이 발생하더라도, 균열이 더 이상 진행되지 못하고, CNT섬유를 회피하여 굴절되다가 멈추게 된다.Due to the CNT fibers of the CNTf_Cf/SiC composite (40), even if a crack occurs inside, the crack does not progress any further, but rather bends around the CNT fibers and stops.
10: 탄소섬유_CNT섬유_혼합패브릭 20: 탄소섬유_CNT섬유_혼합프리프레그
30: 보강재 40: CNTf_Cf/SiC 복합재10: Carbon fiber_CNT fiber_blended fabric 20: Carbon fiber_CNT fiber_blended prepreg
30: Reinforcement 40: CNTf_Cf/SiC composite
Claims (4)
상기 탄화규소 기지를 보강하는 보강재로 구성되며,
상기 보강재는,
탄소섬유와 CNT섬유를 직조하여 만든 탄소섬유_CNT섬유_혼합패브릭이, 설정된 개수만큼 적층되어 형성된 것을 특징으로 CNTf_Cf/SiC 복합재.Silicon carbide base; and
It is composed of a reinforcing material that reinforces the above silicon carbide base,
The above reinforcing material is,
A CNTf_Cf/SiC composite material characterized by being formed by laminating a set number of carbon fibers and CNT fibers into a carbon fiber_CNT fiber_blended fabric.
상기 설정된 개수의 탄소섬유_CNT섬유_혼합패브릭에 탄화규소 슬러리를 함침시켜 설정된 개수의 탄소섬유_CNT섬유_혼합프리프레그를 제조하는 제2단계;
상기 설정된 개수의 탄소섬유_CNT섬유_혼합프리프레그를 적층하여 보강재를 만드는 제3단계;
상기 보강재를 성형틀에 넣고 가압 및 가열하여 성형체로 만드는 제4단계;
상기 성형체를 비활성분위기에서 800~900℃로 탄화하여 탄화체로 만드는 제5단계;
상기 탄화체에 전구체 용액을 함침하는 제6단계; 및
상기 제5단계 및 상기 제6단계를 설정된 횟수만큼 반복하는 제7단계를 포함하는 것을 특징으로 하는 CNTf_Cf/SiC 복합재 제조방법.Step 1: Prepare a set quantity of carbon fiber_CNT fiber_blended fabric made by weaving carbon fiber and CNT fiber;
A second step of manufacturing a set number of carbon fiber_CNT fiber_blended prepregs by impregnating the set number of carbon fiber_CNT fiber_blended fabrics with silicon carbide slurry;
A third step of making a reinforcing material by laminating the above-mentioned number of carbon fiber_CNT fiber_mixed prepregs;
Step 4: placing the above reinforcing material into a mold and pressurizing and heating it to make a molded body;
Step 5 of carbonizing the above-mentioned molded body at 800 to 900°C in an inert atmosphere to make a carbonized body;
A sixth step of impregnating the above carbonized body with a precursor solution; and
A method for manufacturing a CNTf_Cf/SiC composite, characterized by including a seventh step of repeating the fifth and sixth steps a set number of times.
상기 탄화규소 슬러리는 알파-실리콘 카바이드 내화 미립자로 채워진 폴리실록산 수지로 구성된 것을 특징으로 하는 CNTf_Cf/SiC 복합재 제조방법.In the second paragraph,
A method for manufacturing a CNTf_Cf/SiC composite, characterized in that the silicon carbide slurry is composed of a polysiloxane resin filled with alpha-silicon carbide refractory fine particles.
상기 전구체 용액은 Si-C 및 Si-O 결합 구조를 모두 가지고 있는 실리콘 옥시카바이드 세라믹 전구체 용액인 것을 특징으로 하는 CNTf_Cf/SiC 복합재 제조방법.In the second paragraph,
A method for manufacturing a CNTf_Cf/SiC composite, characterized in that the precursor solution is a silicon oxycarbide ceramic precursor solution having both Si-C and Si-O bonding structures.
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