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붕소 산화물이 첨가된 탄소/탄소 복합재의 흑연화 및 산화저항성
최돈묵 경원전문대학 2002 論文集 Vol.24 No.-
To improve the oxidation resistance of the carbon/carbon composites according to the heat treatment temperature, reinforcement and adding method of boron oxide, various types of carbon fiber and novolac type phenolic resin matrix composites were molded and heat treated up to 2000℃ or 2400℃. The oxidation resistance was observed with TGA and EPMA. The results of this study could be summarized as follows. 1. As a results of analysing with EPMA, the residual amounts of boron oxide carbon/carbon composites reinforced with PAN based carbon fiber compared to the others. These results were brought from crystalline orientation, degree of crystallinity and structural continuity. 2. Boron oxide enhanced the graphitization and the oxidation resistance.
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현상학적 관찰에 의한 연소패턴의 식별에 관한 연구(사례를 중심으로)
최돈묵,최재성,최승복 한국화재소방학회 2009 한국화재소방학회논문지 Vol.23 No.6
The burned patterns of fire are changed very diversely according to the direction of wind, conditions of combustibles, shape of buildings and so on in the fire scenes. And careful attentions are required on the determining of ignition point and fire causes. In this study, we examined that the burned pattern of fuel controlled fires and ventilation controled fires that impose a heavy burden on fire investigators, carbonized marks of floor, formed by flammable liquids, and combustion marks of falling firing materials through the fire cases. We suggest a proper fire investigation method. 화재현장은 바람의 방향과 세기, 가연물의 조건, 건물의 형태 등에 따라 다양하게 소훼형태가 변하기 때 문에 발화부와 화재원인을 판단함에 있어 세심한 주의가 필요하다. 본 연구에서는 화재 조사자들이 곤란 을 겪고 있는 환기지배와 연료지배에 따른 연소형태, 인화성물질에 의한 바닥재의 탄화형태와 낙화(落火) 물에 의한 연소흔적을 사례를 통해 살펴보고 조사방법을 제시하였다.
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최돈묵,김정일,Choi. Don-Mook,Kim. Joung-Il 한국방재학회 2001 한국방재학회논문집 Vol.1 No.1
CFRCs는 고온에서의 우수한 물성에도 불구하고, 연소에 대한 취약한 성질로 인하여 많은 분야에서 사용에 제약을 받고 있다. 그러므로 EFRCs의 연소저항성을 향상시키기 위해서 수 많은 연구가 수행되어지고 있다. 본 연구에서는 고온에서 보다 개선된 물성과 높은 연소저항성을 부여하고, 다른 도포물질과 비교해서 낮은 열팽창계수의 차이를 보이는 탄화규소를 Pack-Cementation 방법으로 4방향성 CFRCs에 도포하였다. 제작된 탄화규소로 도포된 CFRCs는 광학현미경의 관찰을 통하여 도포 메카니즘을 추정하였으며, TGA 시험을 통하여 개선된 연소저항성을 조사하였다. Arc plasma torch 시험을 통하여 고온 연소특성과 거동을 연구하였다. 그 결과로부터 탄화규소로 코팅된 CFRCs의 기계적 강도와 고온 연소특성이 순수한 4방향성 CFRCs에 비해서 개선되었다는 것을 알았다. Although Carbon/Carbon Composites(CFRCs) have excellent mechanical properties at high temperature, the disadvantage of combustion in air restricts their applications. Thus a lot of investments have been studied to improve the drawback of CFRCs. In this study, SiC used as a thermal protective coating material possesses almost the same expansion coefficient compared to that of carbon, so SiC was coated on 4D (directional) CFRCs by Pack-Cementation process. For the 4D CFRCs coated with SiC, optical microscopy observations were performed to estimate the coating mechanism involved and TGA tests were also performed to evaluate the improvement of combustion resistance. And their high temperature combustion properties were investigated by the arc torch plasma test. From the results, it is found that the mechanical properties and high temperature combustion properties of the 4D(directional) CFRCs coated with SiC were much better than bare 4D CFRCs.
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최돈묵,인세진,이창우,박창우 한국화재소방학회 2007 한국화재소방학회논문지 Vol.21 No.4
In order to breed fire investigators, can scientifically find out the truth of fire causes, the development of special and systematic education programs and the repetitive retraining is the most important factor. In this study, the working problems of curriculum for fire investigation course were analyzed through the survey. The curriculum and management status of domestic and foreign professional fire investigation education authority were compared and analyzed. And we suggested that the possible solutions to the problem, which can affect on the education effects, curriculums, training methods, selective methods, and effective applying method. 화재원인을 과학적으로 규명할 수 있는 화재조사자를 양성하기 위해서는 전문적이고 체계적인 교육프로그램 개발과 반복적인 재교육이 가장 중요한 인자이다. 본 연구는 화재조사교육과정의 운영상 문제점 등에 대하여 설문조사를 통하여 분석하고 국내·외 화재조사 전문교육기관의 교육과정 운영 실태 등을 비교·분석하여 교육효과에 영향을 미칠 수 있는 교육과정, 교육방법, 교육생 선발 방법 및 효과적인 활용 방안 등의 문제점에 대한 해결방안을 제시하였다.
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탄화규소를 도포한 4 방향성 탄소/탄소 복합재의 산화저항성
최돈묵,인세진 경원전문대학 2000 論文集 Vol.22 No.-
To improve the oxidation resistance of the 4D CFRCs, the surface of CFRCs was coated with SiC by the pack cementation method. The morphology of crystalline and texture of these SiC coated 4D CFRCs were investigated by XRD and SEM/EDS observation. The oxidation resistance were observed through the air oxidation test and the ablation properties of them observed by torch test. The results of experiment could be summarized as follows. 1) As a result of analysing the 4D CFRCs with SEM and EDS, it was found that the material on which coated by pack cementation was the SiC, and the thickness of coated layer was about 200㎛. 2) The oxidation resistance of SiC coated CFRCs was much increased up to 1,500℃ as a result of air oxidation test. As oxidation temperature initiated was about 800℃, temperature was raised about 300℃. 3) From SEM observation after air oxidation test, glassy anti-oxidation layer of SiO_(2) was formed on surface of CFRC. 4) At arc plasma torch test the ablation rate of bare CFRC was 0.0590 g/sec, while SiC coated CFRC at coating temperature of 1850℃ was 0.0013g/sec.
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최돈묵 경원전문대학 2001 論文集 Vol.23 No.-
As the applied pressures to 4D c/c composites increased form 100bar to 900bar, the densification ratio was greatly improved. The effect of pressure affects ablative property as well as morphology. The microstructure of c/c composites were examined to determine the influence of pressure on the densification, where coal tar pitch impregnated to the 4D weaving preforms by applying the different pressures of 100 and 900bar, respectively.
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탄소/탄소 복합재의 제조, 기계적 물성 및 공기 산화반응에 관한 연구
최돈묵,오인석,인세진 경원전문대학 1998 論文集 Vol.20 No.-
페놀수지 결합재 CFRC의 형태를 조사한 결과 결합재가 풍부한 400 ∼ 500℃ 부근에서 많은 균열이 발생하였으며 THFSP 결합재를 2300℃까지 열처리 한 다음 X선 회절분식을 한 결과 (002)면에서 Co/2값이 3.380Å였으며, 2θ값도 26.276°로 천연흑연의 Bragg angle에 접근하였다. 그리고 공기산화 반응특성을 시험하기 위하여 등온 열중량 분석을 한 결과 2300℃까지 흑연화한 THFSP 결합재가 산화에 대하여 가장 우수한 저항성을 나타내었으며 섬유용적률이 증가됨에 따라 65∼70%까지는 기계적 물성이 증가하는 경향을 보였지만 그 이상 섬유가 보강된 CFRC는 결합재의 부족으로 인하여 오히려 기계적 물성이 감소하였다. Many cracks were occurred around 400∼600℃ on the rich matrix region of phenolic resin matrix CFRC. And it is observed that cracks and pores formed in green body were developed relative to heat treatment temperature. After heat treating the THFSP matrix up to 2300℃ and XRD analysis, the value of Co/2 was 3.380Å, which was analogious to structure of natural graphite. The value of 2θ, 26.27˚ approached Bragg angle of natural graphite. The THFSP matrix, graphitized up to 2300℃, was the best resistance against air oxidation. And mechanical properties were increased up to 65-70% as fiber volume fraction increases, but the CFRC which was added too much fiber has decreasing mechanical properties due to the deficiency of matrix.
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