论文总字数：15003字

摘 要

发电，炼油，冶金等工业过程中排放的有害气体是人类健康和环境最大的威胁之一。排放的包括颗粒物，氮氧化物和硫氧化物等工业废气对人们的生活质量有着显著的危害。人们通常用空气净化技术来处理尾气，包括旋风分离器，静电除尘器，织物过滤器和膜分离过程。近年来由于陶瓷膜的高化学稳定性和高使用寿命的特点，其气体过滤的膜分离方法已经引起了越来越多的关注 。陶瓷膜通常由支撑层和分离层组成，其支撑体必须为多孔结构以允许过滤期间的气体渗透，并且应当具有高弯曲强度和化学稳定性。在陶瓷材料中，碳化硅具有优秀的的热稳定性，抗蠕变性和使用寿命，这些都是作为高温气体过滤材料的必备特性。

管式碳化硅支撑体的烧结温度很高，通常高达1800-2000℃，查阅文献发现加入十二烷基苯磺酸钠（SDBS）能够有效的降低其烧结温度，加入后的烧结温度仅需1150℃，挤出成型高效，易于连续性生产，自动化，可以很好减少能耗。又因为碳化硅是瘠性材料，塑性差，难以压制成型，所以本文加入甲基纤维素作为粘结剂，甘油作为润滑剂，石蜡作为增塑剂来提高其塑性。本文以烧结成的试样的性能作为衡量标准，来确定SDBS的最佳加入量，之后在SDBS最佳加入量的基础上对甘油，石蜡，甲基纤维素进行实验，确定这些添加剂的最佳加入量。本次实验的管式碳化硅支撑体试样通过干压法制备，通过表征不同含量的添加剂烧结成的试样，来得出各添加剂最优的含量。结果表明，分别加入2%的SDBS和3%的甲基纤维素辅以2%的石蜡和2%的甘油所制得的管式碳化硅支撑体试样的性能最佳，孔隙率为53.4%，强度为11.9MPa,通量为950m³/m² h kPa。最后的放大实验测得Φ60成品的孔隙率为44.8%，强度为30MPa,通量为99m³/m² h kPa。这项研究能够的有效的显示出上述添加剂对制得的管式碳化硅支撑体试样性能的影响趋势。

关键词： 管式碳化硅支撑体 添加剂 SDBS 甲基纤维素

Effect of Additives on the Properties of Silicon Carbide Ceramic Support

Abstract

Power generation, refining, metallurgy and other industrial processes emissions of harmful gases was one of the greatest threats to human health and the environment. Emissions of industrial waste, including particulate matter, nitrogen oxides and sulfur oxides, had a significant hazard to people's quality of life. People typically used air purification technology to treat exhaust gases, including cyclones, electrostatic precipitators, fabric filters and membrane separation processes. In recent years, due to the high chemical stability of ceramic membrane and high service life characteristics of its gas filtration membrane separation method had attracted more and more attention. The ceramic membrane typically consisted of a support layer and a separation layer whose support must be a porous structure to allow gas permeation during filtration and should have high bending strength and chemical stability. In ceramic materials, silicon carbide exhibits excellent thermal stability, corrosion resistance and thermal shock resistance, all of which are essential properties for high temperature gas filtration materials

There were many factors that affect the performance of porous silicon carbide ceramics. In this paper, the effects of additives such as glycerol, paraffin, methylcellulose and sodium dodecylbenzene sulfonate (SDBS) on the properties of the prepared porous silicon carbide ceramics were studied. The experimental sample of porous silicon carbide ceramic prepared by static pressure method, by characterizing the different content of the additives sintered into the sample, to obtain the optimal content of each additive. The results showed that the porous silicon carbide ceramic samples prepared with 2% SDBS and 3% methylcellulose were the best, the porosity was 53.4%, the intensity was 11.9MPa, the flux was 950m³/m²hKPa This study can effectively show the effect of different additives on the performance of the prepared porous silicon carbide ceramic samples.

Key Words: Silicon carbide tubular support;Additive;SDBS;MC

目录

摘要 I

Abstract II

目录 III

第一章 文献综述 1

1.1管式碳化硅支撑体概述 1

1.2管式碳化硅支撑体的性能指标 1

1.3 管式碳化硅支撑体支撑体的制备方法 1

1.4课题研究目的及意义 4

第二章 实验步骤和方法 5

2.1 实验原料及仪器 5

2.1.1 实验原料 5

2.1.2 实验仪器 5

2.2实验工艺流程 6

第三章 结果与讨论 8

3.1 实验原料的孔径测定 8

3.2添加剂加入量对管式碳化硅支撑体各方面性能的影响 9

3.2.1 SDBS含量对管式碳化硅支撑体性能的影响 9

3.2.2 甲基纤维素含量对管式碳化硅支撑体性能的影响 11

3.2.3 甘油含量对管式碳化硅支撑体性能的影响 12

3.2.4 石蜡含量对管式碳化硅支撑体性能的影响 13

3.3 放大实验 14

第四章 结论与展望 17

参考文献 18

致谢 20

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