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박성수,이창희,이현,이헌수,손명모,박희찬,Park, S.S.,Lee, C.H.,Lee, H.,Lee, H.S.,Shon, M.M.,Park, H.C. 한국재료학회 1998 한국재료학회지 Vol.8 No.12
열처리 온도 및 시간의 변화에 따라 $PbO-TiO_2$-$A1_2O_3$-$SiO_2$유리계의 열처리된 시편들에서 perovskite $PbTiO_3$ 결정의 결정화 거동을 X선 회절 (XRD)과 주사 전자 현미경 (SEM)에 의하여 조사하였다 고온에서 장시간 동안 열처리된 시편은 높은 결정화도를 나타내었다. 열처리 시간이 증가할수록 $610^{\circ}C$와 $650^{\circ}C$ 에서 열처리된 시편들의 유전 상수는 증가했지만, $800^{\circ}C$에서 열처리된 시편의 유전 상수는 감소하였다. 시편들의 손실 정접은 열처리 조건에 거의 영향을 받지 않았다. $800^{\circ}C$에서 1h, 2h 및 8h 동안 열처리된 시편들의 압전 계수는 $1.0\times10^{-12}~8.0$\times$10^{-12}C/N$ 정도 이었다. The crystallization behaviour of perovskite $PbTiO_3$ for the samples heat- treated at various temperatures for various times in the $PbO-TiO_2-A1_2O_3-SiO_2$, glass system has been investigated by the means of X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses. Higher crystallinity obtained in the sample heat-treated at higher temperature for longer time. With increasing heat-treatment time, dielectric constant of the samples heat-treated at $610^{\circ}C$ and $650^{\circ}C$ increased, but that of the sample heat- treated at $800^{\circ}C$ decreased. Loss tangent of the heat-treated samples was not much influenced by heat-treatment conditions. Piezodielectric charge constant was approximately $1.0\times10^{-12}~8.0$\times$10^{-12}C/N$ in the samples heat-treated at $800^{\circ}C$ for 1h, 2h, and 8h.
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이창희(C.H.Lee),양동열(D.Y.Yang),이용신(Y.S.Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Deformation texture with preferred orientation is developed by external disturbance applied to the grain during the deformation process such as rolling. The formation of deformation texture strongly influencing the mechanical property of the product, and material anisotropy is observed from the deformation texture, macroscopically. Therefore, the proper consideration and analysis of deformation texture is required. In the present work, the method for prediction of deformation-induced anisotropy employing the phenomenological yield potential is proposed. The proposed algorithm is applied to the anisotropic evolution for simple deformation modes, such as uniaxial stress state and pure shear stress state in X- Y direction. In order to verify the effectiveness of the method, the result from the proposed algorithm is then compared with that from the crystallographic texture analysis.