论文总字数：20189字

摘 要

5G陶瓷滤波器目前已成为众多上市公司竞相投入巨资的热点。微波介质陶瓷(MWDC)是在微波频段电路中的作为介质材料，并且完成一种或几种功能的陶瓷，在现代通讯、雷达、卫星高端信息及其军事系统领域，有着广阔的应用与巨大的市场需求。

本文主要介绍了微波介质陶瓷的发展历史、现状、趋势、分类、制备方法，侧重综述了BMN系钙钛矿型陶瓷现阶段的发展状况。本文讨论了BMN系钙钛矿微波介质陶瓷的预烧温度（T_c）、烧结温度(T_s）、保温时间对试样烧结性能、介电性能与之间的关系，对烧结样品的介电性能进行了详细的测试，对试样的XRD、SEM分析进行了推演，优化了陶瓷性能最为优异的预烧温度、烧结温度参数，总结了预烧温度、烧结温度对陶瓷的介电常数、品质因素、谐振频率温度系数的影响关系。

本文在文献查阅、系统学习、深入了解BMN系钙钛矿的晶体结构的基础上，为BMN系钙钛矿微波介质陶瓷的改性奠定了较为扎实的理论知识，设计优选了添加剂、完善了工艺参数，对BMN系钙钛矿型微波介质陶瓷进行改性，得到介电性能较为理想的致密化烧结体陶瓷材料。

关键词： 钙钛矿结构 微波介质陶瓷 介电性能

Study on Preparation and Properties of BMN Perovskite Microwave Dielectric Ceramics

Abstract

5G ceramic filters have become a hotspot for many listed companies to invest heavily.Microwave dielectric ceramic (MWDC) in the microwave band circuit as a dielectric material, and complete one or several functions of the ceramic, in modern communications, radar, satellite high-end information and military systems, has a wide range of applications and huge market demand.

This paper mainly focuses on the outline of the current stage of BMN calcium titanium development, and introduces the development history, status, trends, classification and preparation method of microwave dielectric ceramics ore type ceramic.This paper discusses the BMN system of calcium titanium microwave dielectric ceramics of the pre-firing temperature (Tc), sintering temperature (Ts), insulation time on the specimen sintering performance, dielectric properties and the relationship between the sintered samples of the dielectric properties of the detailed test, the specimen XRD, SEM analysis was extrapolated to optimize the ceramic performance of the most excellent pre-firing temperature, sintering temperature parameters, summarized the pre-firing temperature, sintering temperature on the ceramic dielectric constant, quality factors, resonant frequency temperature coefficient of influence relationship.

In this paper, based on literature review, systematic study and in-depth understanding of the crystal structure of BMN calcium and titanium ore, a solid theoretical knowledge was laid for the modification of BMN calcium and titanium ore microwave dielectric ceramics, and the design of additives was optimized and process parameters were perfected.

KEYWORDS:Perovskite structure；Microwave dielectric ceramics; Dielectric properties

目 录

摘 要 Ⅰ

Abstract II

目 录 III

第一章 绪论 1

1.1引言 1

1.2微波介质陶瓷简介 1

1.2.1微波介质陶瓷的历史发展 1

1.2.2微波介质陶瓷的国内外发展现状 2

1.3微波介质陶瓷的发展 2

1.3.1微波介质陶瓷的发展趋势 2

1.3.2微波介质陶瓷的分类 3

1.3.3微波介质陶瓷的制备方法 4

1.4介质陶瓷的性能要求 5

1.5钙钛矿微波介质陶瓷的结构特征 5

1.6研究目的和研究内容 7

第二章 实验方案 9

2.1实验工艺 9

2.1.1实验原料 9

2.1.2实验设备 9

2.1.3实验步骤 9

2.2样品分析测试 11

2.2.1烧结性能测试 11

2.2.2 XRD物相分析 11

2.2.3扫描电子显微镜分析(SEM) 12

2.2.4介电性能测试 12

第三章 BMN系钙钛矿微波介质陶瓷性能分析 13

3.1二次球磨方式对样品致密度的影响 13

3.2预烧粉末粒度分析 13

3.3掺杂不同含量的MgO对BMN陶瓷介电性能的影响 14

3.3.1体积密度 15

3.3.2介电常数 15

3.3.3品质因数 16

3.3.4谐振频率温度系数 16

3.4预烧温度(T_c)和烧结温度(T_s)对介电性能的影响 16

3.4.1物相分析 16

3.4.2烧结特性分析 17

3.4.3介电性能分析 17

3.4.4显微结构分析 17

3.5 保温时间对介电性能的影响 18

3.5.1物相分析 18

3.5.2介电性能分析 18

第四章 实验结论与展望 19

4.1实验结论 19

4.2未来展望 19

参考文献 20

致 谢 23

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