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알루미나 분말 기지혼합체의 상온 반복압축 후 가압소결 -상온 반복압축 효과-
손건석,서정,박병학,김기태,Son, G.S.,Suh, J.,Park, B.H.,Kim, K.T. 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.2
Hot pressing after cold cyclic compaction of Al2O3 powder mixtures containing SiC whiskers or Al2O3 short fibers is studied with emphasis on the effects of cold cyclic compaction. The green density of the mixtures increases as the cycle number increases and the cyclic pressure becomes higher. The higher green density is also obtained by cold cyclic compaction with the lower pressrue than a single stroke cold compaction. To achieve a higher densification during hot pressing, cold cyclic compaction before hot pressing is more efficient compared to the conventional hot pressing process (without cold cyclic compaction). Moreover, a low cyclic pressure did not affect on toughening mechanism by whisker reinforcement.
상온 반복압축 후 가압소결에 의한 알루미나 분말의 소결특성 -치밀화와 결정립 성장 및 파괴인성-
손건석,서정,백성기,김기태,Son, G.S.,Suh, J.,Baik, S.K.,Kim, K.T. 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.1
Densification of alumina powder, grain size and fracture toughness of sintered body by hot pressing after cold compaction were investigated and compared to traditional hot pressing process (without cold cyclic compaction). To achieve a higher densification and to reduce the hot pressing time, hot pressing after cold cyclic compaction was more efficient compared to traditional hot pressing. This phenomenon resulted from the increment of packing densityby the acceleration fo rearrangement of powders under cold cyclic compaction. The grain size of sintered body was only dependent on relative density, and densification during hot pressing was governed by thelattice diffusion. Comprisons of grain size, densification mechanism and fracture toughness resulted from hot pressing after/without cold cyclic compaction showed that a low cyclic pressure may not effect on the fragmentation of alumina powders.
[가솔린엔진부문] 광촉매 성능 및 내구에 미치는 조촉매 영향 평가
손건석(Geon Seog Son),고성혁(Seong Hyuk Ko),윤승원(Seung Won Yun) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As a promising catalyst reducing cold start emissions of automobiles, a photocatalyst system has been studied. The photocatalyst is activated by UV wavelengths light, it need no heat energy like as a conventional TWC. Therefore it needs no light off time. However, as a cold temperature catalysts, photocatalysts has some problems to apply on vehicle system.<br/> In this study, additive catalysts for photocatalysts was investigated in the points of increasement of the performance and the durability. Two kinds of additive were coated with two kinds of photocatalysts. The samples were aged with a hydrothermal aging method. The performance of these samples were tested on a model gas apparatus. The durability was also tested with XRD.<br/>
손건석(G. S. Son),이지연(G. Y. Lee),이귀영(K. Y. Lee),최병철(B. C. Choi) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
Quick aging of catalysts has done wi th, IAE AGING MODE suggested by lAE. To estimate the<br/> effects of number of aging cycle. temperature and H₂O. characteristics of surfaces. mechanical properties and Weibull Modulus were estimated. Also, the conversion efficiency of aged catalysts was evaluated with model gas bench test. The area of surface and pore volume were decreased according to the number of aging cycle. The precious metal which is well dispersed in fresh state was sintered and agglomerated with aging. The mechanisms ui deactivation and sintering of catalysts are discussed on the basis of mechanical tests. The conversion efficiency was decreased wi th the repeats of aging. Especially. the existence of H₂O in supply gas had a main role in catalyst deactivation with high temperature.<br/>
2차공기 공급을 이용한 배기 저감 기술의 실용성에 관한 연구 Ⅱ
손건석(G.S.Son),고성혁(S.H.Ko),이귀영(K.Y.Lee),최의락(E.R.Choi),김영웅(Y.W.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
One of the promising technologies for LEV program secondary air injection system has been studied widely. In this paper feasibility test of secondary air injection system for LEV program and a comparison of its efficiency with that of a passive A/F control system were done using the FTP75 test on a 2.0 DOHC A/T vehicle. The engine out and tai lpipe emissions were recorded by the second with the temperatures of exhaust gas and the warm up converter. The temperatures were measured at manifold, inlet and the center of the warm up converter. The vehicle had a 0.67L Pd-only warm up converter and a 1.8L underbody converter which were 50k aged on MAD for the aftertreatment system and a ECU of LEV level. The ULEV regulation was sat isfied through a secondary air inject ion system. But the ULEV regulation was also satisfied with the lean A/F control during the first 40 sec after cold start. This study showed the lean A/F control strategy could be one of the potent ial technologies to meet LEV/ULEV regulations without any other additional active system.<br/>
손건석(G.S.Son),최병철(B.C.Choi),이귀영(K.Y.Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
To find out optimum operating conditions for a EHC system, space velocity, coexistence gases and O₂ concentration effects were examined. The best HC and CO conversion efficiency was obtained in the range of 13000 - 14000 1/h space velocity. It was found that HC conversion at cold-start of the engine was improved by the coexistence of CO. While, O₂ concentration and coexistence of NOx did not affect the conversion efficiency of HC.<br/>