标题: | 陶瓷/高分子与陶瓷/玻璃复合材料的微波介电性质 The microwave dielectric properties of composite ceramics/polymer and ceramics/glass |
作者: | 陈光中 Kung-Chung Chen 林鹏 Pang Lin 材料科学与工程学系 |
关键字: | 微波介电材料;陶瓷;高分子;玻璃;介电常数;microwave dielectric materials;ceramics;polymer;glass;dielectric constant |
公开日期: | 1999 |
摘要: | 由于通讯产业的快速发展,使得人们对于元件的微小化及材料特性的优质化要求日增,用于此用途的微波介电材料便成为研究重点,尤以添加低熔点玻璃使低温可共烧的微波陶瓷更是焦点。另外,陶瓷/高分子复合材料的微波介电性质也在本文中提及。本研究首先探讨陶瓷/高分子异相间体积百分比的改变与其微波特性的关系,分别以热固性塑胶PVDF为基底相,商用微波陶瓷(HF22K、HF37N、MSZT40S(B)、MBT-40B、MRT45B、HF90HQ)与Al2O3、BaO-La2O3-4TiO2、BaO-La2O3-4.7TiO2、TiO2等陶瓷为分散相制作复合材料,发现前人推论的数个理论模型中,尤以Lichtenecker所建立之公式最能有效预估复合材料的介电常数,但介电损失因子与共振频率温度系数方面,则未发现有效可预估之模型。另外,得知陶瓷/高分子复合材料相对介电常数ε与Q值都不高。 本研究第二部份则探讨Lichtenecker之公式能否预估低熔点玻璃-陶瓷系统的介电常数。此部份选用商用玻璃(GA9、GP5210、EG3606)为基底相,Al2O3、BaO-La2O3-4TiO2及BaO-La2O3-4.7TiO2陶瓷为分散相,发现如玻璃与陶瓷彼此产生反应,在无法推知新相的产生量下,将无法藉由Lichtenecker公式推算合成的介电常数。 Due to the rapid growth of communications industry using microwave frequencies, such as car telephones and portable phone, has created a demand for the greater miniaturization and better characteristics of components such as band pass filters and local oscillators. Therefore, studying the microwave dielectric materials becomes more and more important. First, this article reports on a study of the microwave dielectric properties of ceramics dispersions in a polymer matrix. Samples investigated in this study are composed of ceramics powders(HF22K, HF37N, MSZT40S(B), MBT40B, MRT45B, HF90HQ, Al2O3, TiO2, BaO-La2O3-4TiO2, and BaO-La2O3-4.7TiO2)randomly dispersed, with a desired volume concentration, in a polymer(PVDF) matrix. The experimental values of dielectric constant are compared to those obtained by using different dielectric constant mixing laws. Only Lichtenecker formula can agree with experiments, but there is no effective model to predict the dielectric loss and the temperature coefficient of resonant frequency . The second part of the study, we discuss the relationship between the dielectric constant of ceramics/glass composite and glass additions. In this part, we use commercial glass (GA9, GP5210, and EG3606) as a matrix and ceramics (Al2O3, BaO-La2O3-4TiO2, and BaO-La2O3-4.7TiO2) as dispersions. If ceramics and glass is reacted, Lichtenecker formula is fail to predict the dielectric constant of the ceramics/glass composite. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#NT880159036 http://hdl.handle.net/11536/65311 |
显示于类别: | Thesis |