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박종곤,이종국,서동석,김민정,이은구,김환,Park, Jong-Gon,Lee, Jong-Kook,Seo, Dong-Seok,Kim, Min-Jeong,Lee, Eun-Gu,Kim, Hwan 한국세라믹학회 1999 한국세라믹학회지 Vol.36 No.12
출발원료의 상분을 제어와 가압소결 및 열처리에 의하여 자체강화 미세구조를 갖는 탄화규소 세라믹스를 제조하여 그 특성을 고찰하였다. 자체강화 탄화규소 세라믹스는 알파상과 베타상 탄화규소 분말을 혼합한 모든 원료조합으로부터 얻어졌으며, 이러한 미세구조는 열처리 동안 베타상 탄화규소 입자가 긴 막대상 입자 형태를 갖는 4H 상의 알파 탄화규소로 상변태하면서 형성되었다. 긴 막대상의 탄화규소 입자의 부피분율 및 장단축비는 베타상 탄화규소 분말의 함유량이 50%인 시편에서 가장 크게 나타났으며, 이로 인하여 이 시편은 제조된 시편 중에서 가장 높은 인성을 나타내었다. Self-reinforced silicon carbide was prepared by hot pressing and the control of starting phases of raw materials and its microstructural characteristics was investigated. The specimens with self-reinforced microstructure were obtained from the compacts with mixed compositions of ${\alpha}$-and ${\beta}$-SiC powders. Self-reinforced microstructure which is composed of large dispersed grains with rod-like shape and matrix with small equiaxed grains was formed by the transformation to the ${\alpha}$-SiC with 4H polytype for ${\beta}$-SiC and anisotropic grain growth during the heat treatment. Of all speimens the values of volume fraction maximum length and aspect ratio for large grains with rode-like types were the highest at the specimen with 50 vol% ${\beta}$-SiC in the starting SiC powder and therefore this specimen showed the highest fracture toughness due to the crack deflection by rod-like grains during crack propagation.
공동주택의 수직증축형 리모델링에 대한 거주자 의식 연구
박종곤(Park, Jong-Gon),정중영(Jeong, Jung-Young),강정규(Kang, Jeong-Gyu),김철민(Kim, Chul-Min) 한국주거환경학회 2014 주거환경(한국주거환경학회논문집) Vol.12 No.4
The amendment of the housing law that allows the vertical expansion of apartment housing is expected to bring changes to the way to renovate and improve apartment housing aged more than 15 years old in Busan region. This study, therefore, aimed at presenting basic materials for the promotion of remodeling in Busan region by identifying in advance the problems of each area through an empirical analysis on residents" perception of vertical expansion remodeling. As for research methods, a literature review was conducted, collecting date from domestic and foreign theses, books and online portal sites. In addition, in order to identify variations by factor related to residents" perception for the promotion of remodeling, preceding studies were divided into the following three types and then examined: Furthermore, interviews involving actual residents of aged apartment houses were conducted to produce the final questionnaire for a survey, and then a survey and an empirical analysis were carried out on the residents of apartment complexes aged more than 15 years in each of 16 district and county in Busan region, In order to achieve the aims of this study, the degree of satisfaction for the promotion of remodeling was set as a dependent variable, and the following nine variables were set as independent variables: necessity of remodeling; satisfaction with the residential complex; age of the residential complex; the size of the complex; rate of building volume to lot; land price per pyeong; the effect of price rise; proportion of possessed real estate assets; and average monthly income. According to the results of a correlation analysis and a regression analysis on the collected data, the necessity of remodeling had a statistically significant positive effect on degree of satisfaction with vertical expansion remodeling.
이종국,박종곤,이은구,김환,Lee, J.K.,Park, J.G.,Lee, E.G.,Kim, H. 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.3
Silicon carbide with sialon was prepared by hot pressing and transient liquid-phase sintering, and the effects of sintering atmosphere and starting phases on their microstructural characteristics were investigated. The sintered SiC with Sialon composition(Y2O3, AlN, Si3N4) in argon atmosphere had high sintered density and large aspect ratio. But sintered specimens in nitrogen atmosphere showed low aspect ratio and small grian size, becuase of the retardation of phase transformation and grain growth. Addition of Y-Sialon powder to SiC also retarded the phase transformation to ${\alpha}$-SiC from ${\beta}$-SiC and densification. The SiC specimen prepared from the starting ${\beta}$-SiC powder with Sialon composition(Y2O3, AlN, Si3N4) showed the highest fracture toughness about 6.0 MPa$.$m1/2.
알루미나 첨가가 불규칙 입자형상을 갖는 세리아 안정화 지르코니아의 미세구조에 미치는 영향
김민정,이종국,박종곤 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.2
The effect of Al₂O₃ addition on the microstructure of ceria-stabilized zirconia with irregular grain shape was investigated. Specimens doped with a mixed solution of Al₂O₃+ Ce(NO³)₃ showed undulated grain shape after annealing at 1650℃ for 2h. The specimens added Al₂O₃ inhibited grain growth of Ce-TZP and simultaneously increased the irregularity of the grain shape due to drag effect. Ceria concentration difference between convex and concave sides in irregular grains was observed over 1mol%.
액상량이 탄화규소 소결체의 미세구조 및 상변태에 미치는 영향
이종국,강현희,박종곤,이은구 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.4
${\beta}$-silicon carbides with yttrium aluminum garnet of 2,5,10 mol% were prepared by a liquid--phase sint-ering and the microstructural evolution and phase transformation were investigated during sintering as functions of liquid-phase amount and sintering time. The rate of grain growth decreases with the addition of the amount of yttrium aluminum garnet (YAG) in the SiC starting powder however the apparent density and the aspect ratio of grains in sintered body increase. The phase transformation from ${\beta}$-SiC to ${\alpha}$-SiC were dependent on the liquid-phase amount and sintering time.
이종국,강현희,박종곤,이은구 한국결정성장학회 1998 韓國結晶成長學會誌 Vol.8 No.2
2, 5, 10 mol% YAG(yttrium aluminum garnet) 분말을 액상 소결조제로 $\alpha$상 탄화규소 분말에 첨가한 후 $1850^{\circ}C$에서 소결시간을 달리하여 소결체를 제조한 다음, 소결시 일어나는 미세구조 변화를 첨가된 액상량과 소결시간의 변화에 대하여 고찰하였다. 각 조성중 2시간 소결한 시편에서 가장 높은 밀도를 나타냈으며, 소결시간이 길수록 액상의 기화로 인하여 중량감소량이 점차 증가하였다. 또한 첨가된 YAG 액상량이 증가할 수록 상대밀도(apparent density)와 중량감소량은 증가하였으나 입성장속도는 감소하였다. 액상량이 적은 시편에서는 소결시간이 길수록 일부 6H상의 탄화규소 입자가 4H상 탄화규소 입자로 상전이 되었으며, 이로 인하여 막대상 입자들이 일부 존재하였다. After the addition of yttrium aluminum garnet of 2, 5, 10 mol% as a sintering aid, $\alpha$-silicon carbides were prepared by a liquid-phase sintering at $1850^{\circ}C$, and the microstructural evolution was investigated during sintering as functions of liquid-phase amount and sintering time. The highest apparent density in each compositions was obtained in specimens sintered for 2 h, and the percentage of weight loss increased with sintering time. By increasing the amount of sintering aid (yttrium aluminum garnet), the rate of grain growth during sintering decreased, but the apparent density of sintered body increased. The phase transformation from 6H-SiC to 4H-SiC was partially observed in specimens sintered for a long time, and so, a few rod-like grains were observed.