摘 要随着低温共烧陶瓷（LTCC）技术的快速发展，微波介质陶瓷元器件集成化和小型化的需求正在被满足，为了达到其工艺及元器件的实用要求，微波介质陶瓷在向着低烧结温度、高品质因数以及低谐振频率温度系数等方向发展。86465

本文对ZnO-Nb2O5-TiO2（ZNT）微波介质陶瓷的物理结构和介电性能进行了研究，采用传统固相法制备得到ZnNb2TiO8 微波介质陶瓷，添加不同添加量的B2O3，研究其对材料介电性能的影响，然后讨论不同烧结温度对其介电性能的影响。

实验结果表明同种组分的样品在不同烧结温度下得到的介电性能不同，随着温度的升高，介电性能一般先增加后减小，但是随着温度的变化，总会存在一个最佳的烧结温度使得ZNT陶瓷充分烧结，使其内部各组织烧结均匀。对于添加B2O3粉体的样品，在烧结温度为1050 ℃、B2O3添加量为2。0 wt%时，ZNT陶瓷介电性能最为优异，其εr=32。0，tanδ=0。099。

同时加入微量B2O3粉体能够降低ZNT陶瓷烧结温度，但是过量的B2O3会影响ZNT陶瓷的介电性能，降低其烧结度，而且随着B2O3添加量的增加，其对ZNT陶瓷的性能影响就越大。

毕业论文关键词：微波介质陶瓷；ZnNb2TiO8；介电性能；烧结特性

Abstract With the rapid development of LTCC ceramic technology,the integration and miniaturization needs of microwave dielectric ceramic component are being met。 In order to achieve the practical requirements of processes and components, microwave dielectric ceramics is in the direction of the low sintering temperature, high quality factor and low temperature coefficient of resonant frequency。

In this article, we researched the physical structure and dielectric properties of the  microwave dielectric ceramics ZnO-Nb2O5-TiO2 (ZNT) ,which was prepared by traditional solid phase method。Adding different concentrations of B2O3 powder to study its effect on the dielectric properties of the material, and discussing the impact of different sintering temperature on the dielectric properties。

The results showed that the samples with same kinds of components at different sintering temperatures obtained different dielectric properties。 As the temperature rises,   dielectric properties generally decrease after the first increase。 But as the temperature changes, there will always be an optimal temperature sintering ceramics to make ZNT fully sintered with a sintered homogeneous in each organization。 For adding B2O3 powder samples, when B2O3 was added in an amount 2。0wt%, ZNT have the most excellent dielectric properties in the sintering temperature of 1050 ℃, which εr = 30。2, tanδ = 0。099。

The sintering temperature can be reduced when B2O3 was added to ZNT ceramic powder, but it will also affect the dielectric properties of ZNT ceramic when B2O3 is overdose。 And with the increase of the amount of B2O3, its impact on the performance of the ceramic ZNT is greater。

Keywords: Microwave dielectric ceramic; ZnNb2TiO8;Dielectric Properties; Sintering characteristics

目录

第一章  绪论 1

1。1  引言 1

1。2  微波介质陶瓷的发展及分类 1

1。2。1 微波介质陶瓷的发展 1

1。2。2 微波介质陶瓷的分类 2

1。3 微波介质陶瓷的性能要求 3

1。4  ZnNb2TiO8系陶瓷的研究现状 5

1。5  陶瓷粉末制备工艺 6

1。5。1 溶胶-凝胶法