论文总字数：23268字

摘 要

本文主要研究原料对于多孔碳化硅陶瓷的性能影响，实验中以D50为10μm和50μm的国产SiC粉为主要实验用料，由于通过市场上购得的原料大多粒径分布较为宽泛且杂乱，不符合我们对粒径的要求。所以本文的主要目的是找出缩小颗粒粒径分布的最佳工艺参数以及研究粒径分布对于成品物理性能影响的规律。

在实验开始部分，我们探讨了料将浓度、分散剂种类、分散剂浓度、搅拌时间、搅拌方式各自对于分散效果的影响。而后通过激光共聚焦显微镜观察分散后的颗粒的形貌来判断分散效果以观察其粒径分布，提取合适时间的上层液颗粒作为造粒粉，探讨了不同配比对于烧成成品的物理性能的影响。

实验结果表明，当SiC粉体质量分数为5%，PEI的质量分数为粉体质量的3%，进行先30min的超声搅拌后20min的磁力搅拌的物理方法处理，能得到最佳的分散效果，之后抽取沉降20min的上层液颗粒，当10μm：50μm=4:6的配比，能使得产品具有较好的抗弯强度和显气孔率。

关键词：碳化硅；分散；分级；粒径分布；抗弯强度；显气孔率。

Effect of Raw Materials on Properties of Porous Silicon Carbide Ceramics

Abstract

This paper mainly studies the influence of raw materials on the performance of porous silicon carbide ceramics. In the experiment, domestic SiC powder with D50 of 10μm and 50μm is the main experimental material. Because most of the raw materials purchased through the market are widely distributed and disordered, Meet our particle size requirements. Therefore, the main purpose of this paper is to find the optimal process parameters for reducing the particle size distribution and to study the influence of particle size distribution on the physical properties of the finished product.

At the beginning of the experiment, we investigated the effects of the concentration, dispersant type, dispersant concentration, stirring time, and stirring method on the dispersion effect. Laser confocal microscopy was used to observe the morphology of the dispersed particles to determine the dispersion effect and to observe the particle size distribution，and the upper liquid particles of the appropriate time were extracted as granules, and the physical properties of the different ratios for the finished products were investigated. influences.

It is shown that when the mass fraction of SiC powder is 5% and the mass fraction of PEI is 3% of the powder mass, the physical dispersion of the magnetic stirring after 20 minutes of ultrasonic stirring for 30 minutes can obtain the best dispersion effect. After that, the upper liquid particles settled for 20 min are extracted, and the ratio of 10 μm: 50 μm =4:6 can make the product have better bending strength and apparent porosity.

Key words: silicon carbide; dispersion; classification; particle size distribution; flexural strength; apparent porosity.

目录

摘 要 Ⅰ

Abstract Ⅱ

第一章 文献综述 1

1.1引言 1

1.1.1碳化硅材料概述 1

1.1.2碳化硅的热膨胀系数和导热系数 1

1.1.3碳化硅的硬度和韧性 2

1.2碳化硅粉体的分级方法 2

1.2.1分散剂的类型及用量对浆料性能的影响 2

1.2.2悬浮液（胶体）三种分散稳定机理 3

1.2.3搅拌分散方法的选用 3

1.3本文研究得意义和主要内容 4

1.3.1课题研究的目的及意义 4

1.3.2实验的主要内容 4

第二章 实验流程与方法 5

2.1 实验原料与设备 5

2.2 实验流程 6

2.3 实验结果的表征与测试 7

2.3.1分散效果表征 7

2.3.2 扫描电子显微镜 8

2.3.3 激光共聚焦显微镜 8

2.3.4 抗弯强度 9

2.3.5 显气孔率 10

第三章 结论与分析 15

3.1碳化硅原料的分析 11

3.2影响分散的原因 12

3.2.1搅拌时间对分散效果的影响 12

3.2.2分散剂种类和浓度对分散的影响 14

3.3 颗粒分级前后形貌分析 19

3.4原料对造粒料性能的影响 22

3.5碳化硅陶瓷的烧结性能 24

3.5.1 碳化硅原料对多孔碳化硅陶瓷性能的影响 24

3.5.2 细粉含量对多孔碳化硅陶瓷性能的影响 26

第四章 总结 28

参考文献 29

致谢 32

第一章 文献综述

1.1 引言

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