• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2003.04a
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• pp.128-131
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• 2003

최근 산업의 발달과 생활수준의 향상으로 쾌적한 생활환경에 대한 관심이 높아지고, 이와 관련하여 섬유 분야에서도 미생물에 대한 저항성이나 악취 등을 제거하는 섬유에 관심이 집중되고 있다. 일반적으로 합성 섬유의 항미생물 가공은 내세탁성이 우수하지 못하지만, 극세사의 경우 일반사에 비해 표면적이 커서 가공제의 흡착량이 많아져, 극세사 소재가 가지고 있는 고흡수성을 저하시키지 않으면서 항미생물성을 갖는 나일론/폴리에스테르(N/P) 복합극세사 소재에 대한 연구가 이루어지고 있다. (중략)

• Resources Recycling
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• v.30 no.4
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• pp.35-45
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• 2021

The humidity-control function and manufacturing characteristics of wood-wool boards using waste-paper-mulberry fiber were analyzed in this study. For the manufacture of wood-wool boards, the pulverizing times of waste-paper-mulberry fibers were controlled at 30, 60, 120, and 180 s, and the mixing amounts were controlled by adding 0%, 3%, 6%, and 9%, respectively, as compared to cement. Analysis of the moisture adsorption and desorption characteristics of the wood-wool boards controlled for pulverizing time revealed that the wood-wool board with 60 s of pulverized fiber exhibited the best adsorption and desorption performances. It was estimated that the adsorption and desorption performances of the material itself were adequate even when the boards were mixed because of minimal damage to the fiber. In addition, an analysis of the absorption and desorption characteristics of the fiber-mixture-controlled wood-wool boards showed that the 6%-mixed wood-wool board had the best absorption and desorption performances of 291.00 g/m² and 108.75 g/m², respectively.

• Composites Research
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• v.35 no.4
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• pp.261-268
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• 2022

Ultra-high temperature ceramics (UHTC) such as ZrB₂, ZrC, HfB₂, HfC and TaC have been recently investigated for the application to hyper-sonic systems such as nose-cone, rocket nozzle and leading edge. In this paper, the recent research results about UHTC have been reviewed. Domestic and international research results about UHTC mainly during the last 5 years were briefly summarized. Also, the results of C³HARME project, which was one of the Horizon 2020 program in EU, to get over the problems of UHTC such as brittleness through the fabrication of ultra-high temperature ceramic matrix composites (UHTCMC) were briefly introduced.

• Journal of the Korean Ceramic Society
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• v.30 no.7
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• pp.549-556
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• 1993

Interfacial shear strength plays an important role in determining the mechanical properties of a fiber-reinforced ceramic composites. In this study, the effect ofinterlayer thickness on mechanical properties of Nicalon-fiber-reinforced SiC composites fabricated via polymer solution infiltration/chemical vapor infiltration (PSI/CVI) was studied. It was found that the flexural strength and fracture toughness of the composites were increased with the interlayer thickness and showed maximum value at the interlayer thickness of 0.66${\mu}{\textrm}{m}$. Typical flexural strength and fracture toughness of Nicalon-fiber-reinforced SiC composites with interlayer thickness of 0.66${\mu}{\textrm}{m}$ were 391.7$\pm$34.6MPa and 15.1$\pm$1.8MPa.m1/2, respectively.

• Journal of the Korean Ceramic Society
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• v.30 no.9
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• pp.768-774
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• 1993

Sulphuric acid was intercalated in mesophase pitch based graphite fiber (Thornel P100 of Amoco), PAN based graphite fiber (M40 of Thoray) and PAN based carbon fiber (T300 ofThoray, TZ307 of Taekwang in Korea) by 0.4wt% CrO3/H2SO4 solution. The degree of crystallization of fibers increased P100, M40, TZ307, T300 fiber in order and their d002 values were 3.384, 3.424, 3.470, 3.493$\AA$, respectively. After intercalation P100 fiber formed 1 stage compound whose d002 value was 3.994$\AA$(d001=7.988$\AA$). Other fibers showed (002) reflection belonging to their 1 stage comound and prinstine fiber.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2000.06a
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• pp.1268-1272
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• 2000

본, 논문에서는 카본/에폭시, PZT 세라믹 박판, 글래스/에폭시 층으로 이루어진 곡면형 복합재료 작동기(LIPCA)의 설계, 제작 및 성능실험에 대한 연구 성과를 제시하고 있다. LIPCA의 큰 요점은 기존 THUNDER의 성능을 유지하면서 이를 경량화 하기 위하여 THUNDER의 금속 층을 상대적으로 가벼운 섬유 강화 복합재료로 대체하는 것이다. 이러한 경량화 작업으로 LIPCA는 기존 THUNDER 보다 약 $30{\sim}40%$ 정도의 무게를 감소시킬 수 있으며, 복합재료의 특성에 따라 설계의 유연성을 가질 수 있는 장점이 있다. 또한, 에폭시 수지를 사용함으로써 접착제 없이 평판 몰드에서 오토클레이브에서 $177^{\circ}C$로 경화되어, 탈형된 후 충분한 곡률을 형성하였다. 작동 성능 실험에서, LIPCA는 기존 THUNDER보다 작동변위가 향상됨을 보였다.

• Proceedings of the KSME Conference
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• 2001.06a
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• pp.658-662
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• 2001

Continuous fiber ceramic composites(CPCCs) having the advantages of ceramics resistance to heat, eroson can be applied in chemical reactors and engine. CFCCs has relatively high stiffness in spite of low weight. In particular, it exhibits greatly increased toughness, which serves to decrease its inherent damage characteristics of the brittle nature of monolithic ceramics. In this wort, tensile and flexural test for SCS6 fiber/ $Si_3N_4$ matrix composites were studied. An objective of this study is to obtain the basic quantities of mechanical properties for tension and flexural test and link these to the fracture resistance behavior. Then, we showed that wok of fracture concept was useful as a method for describing fracture restance behavior of CFCCs.

• Journal of the Korean Ceramic Society
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• v.32 no.9
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• pp.995-1002
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• 1995

The alumina fiber was obtained by extruding the TEA complexed polymeric sol, synthesized by the alkoxide sol-gel method, through nozzle. The purpose of this study was to investigate the properties of fiber spun by TEA complexed sol. The analysis of sol indicated that TEA was bonded at alkoxide precursor and the optimum molar ratio for spinning was 0.5 mole of TEA, 3 mole of H2O. The cross section of the fiber from circular nozzle was not circular but oval, which indicated that the shape of nozzle did not affect the shape of fiber. The diameter of the fiber was about 100 ${\mu}{\textrm}{m}$ in the state of dried gel fiber, 60${\mu}{\textrm}{m}$ in calcined fiber, and the tensile strength of the fiber calcined at 90$0^{\circ}C$ was 2.1$\times$108 Pa.

• Ceramist
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• v.12 no.1
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• pp.72-82
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• 2009

• Ceramist
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• v.12 no.1
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• pp.83-92
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• 2009