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Influence of zircon on cristobalite crystallization of silicabased ceramic cores
Jing-jing Liang,Quan-hong Lin,Xuan Zhang,Tao Jin,Xiao-feng Sun,최백규,김인수,도정현,조창용 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.8
Zircon is usually used as a main additive to silica-based ceramic core materials in precise investment casting in order toimprove their high temperature properties. But there is still a disagreement in its effect on crystallization behavior of fusedsilica. In this study, cristobalite crystallization of fused silica in three silica-based core materials containing 10, 30 and 50 wt%zircon respectively were investigated through X-ray diffraction (XRD) and scanning electron microscopy equipped with energydispersive spectrometer (SEM/EDS). Results showed that zircon addition had neglected effect on cristobalite crystallizationduring sintering at 1180 oC, 1200 oC, and 1220 oC, but could decrease crystallization during simulated casting process at1500 oC. It was suggested that diffusion of zirconium atoms played a crucial role in this suppressing behavior of zircon on thecristobalite crystallization. During cooling from 1500 oC, cristobalite transformation from β to α caused microcracks in thesesamples that containing 10% or 30% zircon. But when zircon content increased to 50%, crack was prevented. Less phasetransformation of fused silica → cristobalite and enhanced strength by zircon was supposed to be the reason that wasresponsible for prevented cracks.
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도정(주저자) ( Jing Tao ),오령(공동저자) ( Ling Wu ),김세화(교신저자) ( Se Hwa Kim ) 커뮤니케이션디자인학회 2015 커뮤니케이션 디자인학연구 Vol.50 No.-
본 연구는 일기예보 앱 GUI 디자인의 시각적 복잡도 판단기준과 시각적 복잡도별 사용자 경험 차이를 탐구하는 것으로, 일기예보 앱의 시각적 복잡성을 분류하고 앱 GUI디자인의 시각적 복잡성이 다양한 사용자 경험에 미치는 영향을 검증하였다. 연구결과, 화면의 시각적 복잡성이 높은 일기예보앱에 대한 평가에서 심미적 만족과 즐거움 평가가 상대적으로 낮은 것으로 나타났다. 또한 화면의 시각적복잡성이 증가하면 사용성이 함께 증가하다가 어느 정도 이상이 되면 반대로 감소하는 역U자형 모습을 보이고 있으며, 수행시간 역시 중간 정도의 복잡성을 띠는 앱에 대한 과업 수행속도가 가장 빨랐다. 이는 선행된 웹사이트를 대상으로 하는 연구 결과들과 일치하는 결과이다. The study examines the factors of user``s decision-makings and the differences of the user experience about visual complexity on weather App``s GUI design. The results of this study are as follows: First, through the research method of card sorting and triadic elicitation, the factors that the participants judged the visual complexity of the App were collected and classified according to the attributes of cognition, content and form. Second, when complexity was very high, the evaluations of aesthetics and pleasure were seen to decrease and when complexity was in the mid-range (optimum), usability was evaluated the highest and performance time was measured the fastest. The results of evaluations were indicating the influences of visual complexity of the weather App``s GUI design on the judgment of usability, aesthetics and, pleasure.
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