论文总字数：24899字

摘 要

铝酸盐是目前国内外用量最大、使用最广泛的电子发射材料，人们通过改变原料的配比可得到性能特色各不相同的铝酸盐材料。铝酸盐是由氧化钡、氧化钙、氧化铝在高温下进行固态反应合成的，由于氧化钡和氧化钙极易吸收水蒸气，二氧化碳及其他气态物质，所以一般选择BaCO₃、CaCO₃、Al(OH)₃或Al₂O₃作为合成铝酸盐的原始材料，本文主要以铝酸盐为研究对象，通过研究制备工艺，煅烧温度，保温时间和烧结气氛对配料的影响，并根据反应所得的热重曲线研究铝酸盐的物理性质随温度或时间的变化，从而确定试样的反应历程。继而提高铝酸盐配料的准确性，最终制定出合理的铝酸盐合成制度。

关键词：铝酸盐 煅烧温度 配比组成 反应历程 Ba₃Al₂O₆

TG-DSC Analysis of Cathodic Aluminate Ingredients

Abstract

Aluminate is the most widely used at home and abroad, the most widely used electron emission materials, the use of different raw materials prepared by the aluminate performance characteristics. Aluminate is composed of BaO,CaO, Al₂O₃ at high temperature for solid state reaction synthesis, because BaO and CaO in the air can easily absorb water vapor, carbon dioxide and other gaseous substances, so the general choice of BaCO₃, CaCO_3, Al (OH) ₃ Or Al₂O₃ as the raw material for the synthesis of aluminates. In this paper, aluminate compounds were used to study the effects of different aluminate preparation processes, calcination temperature, holding time and sintering atmosphere on the ingredients. According to the reaction The thermogravimetric curve is used to study the change of the physical properties with temperature or time, and the proportion of the sample is calculated according to the weight change of the pattern in different time periods to determine the reaction course of the pattern. Thereby improving the accuracy of aluminate ingredients, to develop a reasonable aluminate synthesis system.

Key Words:. Aluminate;Calcination temperature; ratio composition; reaction process;Ba₃Al₂O₆

目录

摘要··………………………………………………………………………………Ⅰ

ABSTRACT………………………………………………………………………Ⅱ第一章 文献综述…………………………………………………·……·……·…1

1.1引言……………………………………………………………………………1

1.2 热分析技术…………………………………………………………………··1

1.3 热阴极………………………………………………………………………··1

1.4 铝酸盐的制备方法…………………………………………………………··2

1.4.1高温固相法……………………………………………………………··2

1.4.2液相共沉淀法…………………………………………………………··3

1.4.3机械混合法……………………………………………………………··4

1.5 固相反应动力学………………………………………………………………4

1.6 结语……………………………………………………………………………4

1.7 展望……………………………………………………………………………5

1.8 本论文的主要研究内容及意义……………………………………………··5

第二章 实验设备及方法………………………………………………………··6

2.1 实验原料……………………………………………………………………6

2.2 实验仪器……………………………………………………………………6

2.3 粉体的分析与方法…………………………………………………………7

第三章 不同配比铝酸盐的性能研究………………………………………8

3.1 样品的测试分析……………………………………………………………8

3.1.1样品的制备…………………………………………………………··8

3.1.2性能的分析测试……………………………………………………··8

3.2 不同配比铝酸盐的TG-DSC分析…………………………………………8

3.2.1 BaCO₃:Al₂O₃=3:1的热重曲线分析…………………………………··9

3.2.2 BaCO₃:Al₂O₃:CaCO₃=2.5:1:0.5的热重曲线分析…………………···14

3.2.3 等静压盐的热重曲线分析……………………………………………19

1. 结论与展望……………………………………………………………26

4.1结论…………………………………………………………………………26

4.2 本文的不足之处与展望……………………………………………………27

参考文献…………………………………………………………………………·28

致谢………………………………………………………………………………··30

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