XXX大学本科毕业论文 等离子体二氧化硅表面改性工艺研究
本科生毕业设计
题 目 等离子体二氧化硅表面改性工艺研究
学 院 化工学院
专 业 化学工程与工艺
学生姓名 XXXX
学 号 年级
指导教师
教务处制表
二Ο一六年六月
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XXX大学本科毕业论文 等离子体二氧化硅表面改性工艺研究
等离子体二氧化硅表面改性工艺研究
化学工程与工艺 专业
学生： 指导老师：
摘要：二氧化硅具有独特的化学性质和物理性质，使其广泛应用于人造石、高白玻璃、光学仪器、水处理、高级涂料、电子填充、精密铸造、陶瓷制品、橡胶和塑料填充等五十多个行业。此次主要研究其在精密铸造行业中的应用，二氧化硅某些固有特性是铸件产生粘砂、砂眼、脉纹、气孔、变形及裂纹等缺陷的根源。硅砂经过高温焙烧处理，可以改变硅砂固有特性即消除上述铸造缺陷，而后用于砂型铸造各个领域。
在本文的研究中，利用等离子体技术，建立了一套全新的实验装置和工艺流程，从而对石英砂表面进行改性。
全文包括四个部分：
第一章综述了国内外石英砂表面改性的研究状况和发展状况，详细论述了目前石英砂表面处理的其他方法和石英砂的改性机理，并提出了利用等离子体工艺处理石英砂。
第二章介绍了用等离子体技术处理二氧化硅表面的方法、流程和实验原理，并对实验设备进行了详细描述。我们的方法是直流等离子体熔融法，它是利用等离子体产生的高温和高热焓对石英砂表面进行处理，使石英砂达到铸造砂的要求。
第三章主要通过扫描电镜和XRD得到处理前后砂的晶型和XRD图，还有处理后砂的一些特性和实验现象，对这些实验结果进行了对比分析，并对产生这些结果的原因进行了讨论。
第四章我们的结论是石英砂的耐火性、球形率都有了很大的提高，而且晶型从α型变成了具有β鳞石英特性的α石英砂，砂的膨胀系数和发气量都有了明显的降低，而且原砂表面的有机物、铁、铝等杂质都有了明显的下降。
关键词：等离子体工艺；二氧化硅；铸造砂；表面改性
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XXX大学本科毕业论文 等离子体二氧化硅表面改性工艺研究
The surface modification technology Research of
Silica by the plasma
Major: Chemical engineering and technology Graduate: Zhang Xin Supervisor: Prof.Yin Yongxiang
Abstract: Silica has a unique chemical properties and physical properties, it is widely used in artificial stone, high white glass, optical instruments, water treatment, and advanced coatings, electronic filling, precision casting, ceramics, rubber and plastic filling and other fifty Industries. The main industry in the application of precision casting, some of the inherent characteristics of silicon dioxide is produced adhering sand casting, sand holes, veins, pores, cracks, deformation, and root causes of defects. After high temperature calcination of silica sand, silica sand can be changed to eliminate the inherent characteristics of the casting defects, and then used for sand casting fields.
In this study, the use of plasma technology, a set of new experimental equipment and processes, the use of high temperature plasma generated by the transformation of quartz sand.
Full-text consists of four parts:
The first chapter summarizes the surface modification of quartz sand at home and abroad the research status and development, discussed in detail the current surface treatment of quartz sand and quartz sand other methods modification mechanism, and proposed use of quartz sand plasma Process.
The second chapter describes the silica surface by plasma treatment method of technology, processes and experimental principle, the experimental device is described in detail. Our approach is to DC plasma melting, which is produced high temperature and high heat enthalpy of surface treatment of quartz sand by the plasma, quartz sand to achieve requirements of foundry sand.The third chapter the experimental results are analyzed and discussed.
The third chapter, we can get the crystal sand before and after treatment and XRD chart by scanning electron microscopy and XRD, there are some characteristics of the treated sand and the experimental results, the results of these experiments were compared, and the reasons for these results have been discussed .
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XXX大学本科毕业论文 等离子体二氧化硅表面改性工艺研究
Chapter IV, Our conclusion is that the fire resistance and ball rate of quartz sandhas greatly improved, and from the α-type crystal has become α quartz sand that has a feature of the β tridymite quartz sand, the expansion coefficient and gas evolution of the sand are significantly lower, and the original sand surface organic matter, iron, aluminum and other impurities have a significant decrease.
Keywords: Plasma technology; silica; foundry sand; surface modification
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XXX大学本科毕业论文 等离子体二氧化硅表面改性工艺研究
目录
前言 ......................................................................................................................................... 6 第一章 综述 ........................................................................................................................ 7 1.1 石英砂 .............................................................................................................................. 7 1.2国内外研究现状 ............................................................................................................. 13 1.3 改变砂固有特性的分析 ................................................................................................ 15 1.4等离子体简介 ................................................................................................................ 16 1.5 等离子体表面改性技术 ................................................................................................ 18 1.6 等离子体发生器简介 .................................................................................................. 19 1.7 高温焙烧砂的应用及发展趋势 .................................................................................... 20 1.8 小结 ................................................................................................................................ 22 第二章 实验流程及原理分析 .......................................................................................... 23
2.1 实验设备 ................................................................................................................ 23 2.2 实验流程 ................................................................................................................ 23 2.3 实验原理 ................................................................................................................ 24 第三章 实验数据及分析 .................................................................................................. 25
3.1实验数据 ................................................................................................................. 25 3.2 数据分析 ............................................................................................................... 29 第四章 结论 ...................................................................................................................... 30 参考文献 ............................................................................................................................... 31 声明 ....................................................................................................................................... 33 致谢 ....................................................................................................................................... 34
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