Optimal control of the binder burnout in a LTCC substract

• Main Authors: Chiu Chi Chong, 邱吉晟
• Other Authors: Leo Chau-Kuang Liau
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/71929833061582185888

碩士 === 元智大學 === 化學工程學系 === 92 === The control strategies of optimal heating rates were studied for the burnout process of polymer binders inside a 3-D ceramic body in nitrogen and air atmospheres. The polymer binder can be degraded as gaseous products in higher temperatures and diffuse into the ceramic surface. The burnout process model was described by the kinetics of polymer degradation and the mass transport phenonemum. A finite difference method was used to simulate the pressure distribution caused by the transport of the gaseous products. The pressure distribution can affect the generation of the ceramic defects and have to be controlled by the heating conditions. The computational results show that higher heating rates can generate larger pressure at the body center point and pressure drop at the edge of the surface. In addition, the maximum pressure generated at the body center was higher for operating in nitrogen than in air. However, the burnout period is longer for in an air case than in a nitrogen case. The optimal control of the heating rates was discussed in both cases using the algorithm developed in this work.