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김기태,손건석,서정,Kim, K.T.,Son, G.S.,Suh, J. 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.2
The effects of cyclic stress, frequency and bias-pressure on densification of Al2O3 powder cyclic compaction are investigated. The effect of frequency was not significant on densification of Al2O3 powder under cyclic compaction. The higher the cyclic stress and the lower the bias pressure, the higher densification was achieved. To obtain a higher densification, cyclic compaction was more efficient than 1 stroke compaction. A densification equation was proposed to describe an cyclic time dependent pressure-volume relation for Al2O3 powder under cyclic compaction. This equation was obtained empirically, based on the pressure-volume equation proposed by Cooper and Eaton, the time dependent densification equation by Kim and Suh and experimental data for Al2O3 powder under cyclic compaction. The agreement between the proposed equation and experimental data for Al2O3 powder under cyclic compaction was very good.
지르코니아 분말 성형체의 고온 치밀화 거동과 결정립 성장
김홍기,김기태,Kim, H.G,Kim, K.T 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.8
Densification behavior and grain growth of zirconia powder compacts are investigated under high temperature. Experimental data are obtained for zirconia powder under pressureless sintering, sinter forging and hot isostatic pressing. The constitutive equations by Kwon et al. are used for diffusional creep and grain growth. The constitutive equations by McMeeking and co-workers are also included to study the effect of power-law creep. These constitutive equations are implemented into a finite element program (ABAQUS) to investigate the friction effect during sinter forging and the canning effect during hot isostatic pressing. The agreements between experimental data and finite element results are very good in pressureless sintering and hot isostatic pressing, but not as good in sinter forging.
지식베이스를 기반으로한 자동프로그래밍시스템의 설계 및 구현
성백균(B G SUNG),이상준(S J LEE),황수철(S C HWANG),김기태(K T KIM) 한국정보과학회 1990 한국정보과학회 학술발표논문집 Vol.17 No.1
본 연구에서는 자료처리환경에서의 COBOL프로그램을 자동으로 생성하는 자동프로그래밍시스템의 설계에 관한 방안을 제시하고, 지식베이스를 기반으로한 프로토타입시스템을 구현하여 제한적으로 적용하여 보았다. 본 논문은 자동프로그래밍시스템에서는 프로그래머가 유사한 프로그램을 이용하여 프로그래밍하는 방법을, 일반화된 표준프로그램, 프로그램의 변환규칙, 응용영역의 자료구조 등의 지식으로 표현하여 프로그래밍을 자동으로 수행한다.
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.
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.