摘要：作为新一代长余辉材料,稀土掺杂的碱土硅酸盐被广泛应用于应急显示、交通标示、装饰工艺，乃至织物印花等领域中。本文采取单质硅粉氧化的方法制备硅溶胶，再利用燃烧合成方法制备发光性能较好的离子掺杂硅酸钙镁材料。本文详细研究了单质硅粉氧化法制备SiO2溶胶的工艺条件，并考察了合成硅酸盐的影响因素，结果表明在合成过程中，采用pH值较大的硅溶胶，而不是pH值较小的硅溶胶或硅酸钠溶液，有利于获得较纯的燃烧产物。在燃烧合成过程中，实验的反应温度、实验原料也是燃烧合成关键因素。通过工艺调控，得到了发光性能掺杂稀土元素Eu较好的钙镁硅酸盐Ca2MgSi2O7。研究了Eu3+掺杂和Eu3+，Dy3+共掺衰减、热释光曲线，研究结果表明，解释了发光机理，认为Eu3+是发红光的主要原因。21489
毕业论文关键词：单质硅氧化法；燃烧合成；硅酸盐
Synthesis and properties of the doped calcium magnesium silicate materials synthesis
Abstract: As a new generation of long afterglow materials, rare earth doped alkaline earth silicate and aluminate is widely used in emergency display, traffic signs, decoration, and fabric printing field. The silicon solution were prepared by using the oxydation of silicon powder method in this paper. Rare earth Ions-doped calcium and magnesium silicate better performance were fabracated by combustion synthesis method. Process conditions of SiO2 sol prepared by oxidation of silicon powder were studied in this paper , and the affecting factors of the synthesis of silicate are also considered. The Eu doped Ca2MgSi2O7 with good luminous performance was obtained by using combustion experimental design and synthesis. The results show that in the process of synthesis, silicon solution system with larger pH value should be used rather than silicon solution with smaller pH value. In addition, the factors of reaction temperature and experimental raw material are also importance for combustion synthesis.
Keywords: silicon oxidation method；combustion synthesis；silicate
目录
1.绪论 1
1.1 研究背景及意义 1
1.2 长余辉材料简介 1
1.3 长余辉材料分类 2
1.3.1 硫化物体系 2
1.3.2 钛酸盐体系 3
1.3.3 硅酸盐体系 3
1.3.4 铝酸盐体系 3
1.4 长余辉材料应用 3
1.5 硅酸盐材料 4
1.5.1 硅酸盐的发展 4
1.5.2 硅酸盐的制备 4
1.5.3影响余辉时间长短的因素 6
1.6 钙镁硅酸盐 6
1.6.1晶体结构 6
1.6.2理化性质 7
1.6.3材料合成方法 7
1.6.4材料特点 7
1.7 本课题研究目的与意义 8
2.实验 9
2.1实验原料和设备 9
2.1.1 实验原料 9
2.1.2 实验仪器 9
2.2钙镁硅酸盐的制备 10
2.2.1 硅溶胶的制备 10
2.2.2 .1硅酸钙镁的制备 11
2.2.2.2硅酸钙镁制备流程图 12
2.3 材料性能表征 12
2.3.1 XRD表征 12
2.3.2荧光光谱仪测定 13
2.3.2.1衰减曲线原理 13
2.3.2.2热释光原理 14
3.实验结果与讨论 15
3.1 硅溶胶的制备 15
3.1.1单质硅氧化法 15
3.2 硅酸钙镁材料的制备 16
3.2.1 pH值硅溶胶对硅酸钙镁合成的影响 16 离子掺杂硅酸钙镁材料合成及性能研究:http://www.751com.cn/cailiao/lunwen_13717.html