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        검색결과 6

        1.
        2020.06 KCI 등재 SCOPUS 구독 인증기관 무료, 개인회원 유료
        In this study, factors considered to be causes of promotion of densification of sintered pellets identified during phase change are reviewed. As a result, conclusions shown below are obtained for each factor. In order for MA powder to soften, a temperature of 1,000 K or higher is required. In order to confirm the temporary increase in density throughout the sintered pellet, the temperature rise due to heat during phase change was found not to have a significant effect. While examining the thermal expansion using the compressed powder, which stopped densification at a temperature below the MA powder itself, and the phase change temperature, no shrinkage phenomenon contributing to the promotion of densification is observed. The two types of powder made of Ti-silicide through heat treatment are densified only in the high temperature region of 1,000 K or more; it can be estimated that this is the effect of fine grain superplasticity. In the densification of the amorphous powder, the dependence of sintering pressure and the rate of temperature increase are shown. It is thought that the specific densification behavior identified during the phase change of the Ti-37.5 mol.%Si composition MA powder reviewed in this study is the result of the acceleration of the powder deformation by the phase change from non-equilibrium phase to equilibrium phase.
        4,000원
        6.
        2006.08 KCI 등재 SCOPUS 서비스 종료(열람 제한)
        율무의 이화학적 특성에 볶음 온도가 미치는 영향을 규명하기 위하여, 율무를 에서 각각 20분씩 볶음처리를 하거나 무처리 후 분말과 율무침출액을 제조하여 이화학적 및 관능적 특성을 조사하였다. 분말의 L값과 a값은 볶음온도가 높아짐에 따라 감소와 증가하였으며 특히, 에서부터 큰 폭의 변화를 보였고, b값은 처리구가 가장 높았다. 분말의 흡습 속도와 능력은 볶음온도에 비례하여 증가하는 경향이었다. 율무 침출액의 갈변도는 볶음온도가 높을수록 증가하