氧化铝陶瓷的降温烧结研究

材料科学论文编号:CL120  论文字数:15392,页数:30

目  录
中文摘要 i
英文摘要 ii
目录 iii
第一章     概述 1
 1.1  氧化铝陶瓷 1
 1.2  氧化铝陶瓷的低温烧结技术 1
      1.2.1   通过提高Al2O3粉体的细度与活性降低瓷体烧结温度 2
      1.2.2   通过瓷料配方设计掺杂降低瓷体烧结温度 3
      1.2.3   采用特殊烧成工艺降低瓷体烧结温度 5
 1.3  纳米氧化铝的结构与应用 5
 1.3.1  纳米氧化铝概述 5
 1.3.2  纳米氧化铝结构 6
 1.3.3   纳米氧化铝的应用 6
       1.4  纳米氧化铝的制备方法 7
            1.4.1   固相法 7
            1.4.2   气相法 7
            1.4.3   液相法 8
       1.5  纳米氧化铝制备存在的问题 8
 1.6  CuO和TiO2复相添加剂对氧化铝陶瓷烧结性能的影响 8                 
 1.7  立题依据与研究内容 9
第二章      以CuO-TiO2氧化物助剂为先驱体的纳米Al2O3的制备与表征 10
 2.1   实验过程 10
 2.2   结果与讨论 10
      2.2.1 干凝胶的差热-失重分析 10
      2.2.2 粉体的物相分析 13
      2.2.3 粉体的微观形貌 14
      2.2.4 粉体的激光粒径分析 15
 2.3  结论 16
第三章     玻璃先驱体对溶胶-凝胶合成纳米氧化铝的影响 17
 3.1   实验过程 17
 3.2  结果与讨论 17
            3.2.1 干凝胶的差热-失重分析 17
            3.2.2 干凝胶煅烧后的物相分析与粉体粒径测算 19
            3.2.3 粉体的微观形貌 20
            3.2.4 粉体的激光粒径分析 21
 3.3  结论 22
第四章     结论 23
致谢 24
参考文献 25

摘    要
 
 本文提出氧化铝陶瓷在航天、航空、发动机耐磨部件、电子瓷、陶瓷阀芯、刀具等方面均得到广泛应用。随着氧化铝陶瓷市场需求的不断扩大，氧化铝陶瓷烧结技术的革新也在不断进行之中。近几年来，氧化铝陶瓷的发展主要集中在降低氧化铝陶瓷的烧结温度，降低能耗，缩短烧成周期，减少窑炉和窑具损耗等方面。
 对现代氧化铝陶瓷的要求，就是在降低成本的条件下，利用各种有效的方法使氧化铝陶瓷在更低的温度下烧结致密。本文在前人的设计基础上，以CuO-TiO2复合助剂和玻璃助剂为添加剂，采用溶胶-凝胶法低温合成纳米级氧化铝粉体，并采用DTA-404PC高温差热分析仪和WRT-3P微量热天平分析仪对干凝胶进行差热（DTA)-失重（TG）分析，测试气氛为空气，升温速率为10 ℃·min-1。采用ARL XTRA型X射线衍射仪对粉体进行物相分析，Cu Kα辐射(λ = 0.15406 nm)，管压40 kV，管流80 mA，测量范围2θ = 10~80°。将粉体放入无水乙醇中超声波分散10min，然后置于铜网上利用透射电镜进行观察。结果发现，通过制备上述添加剂的纳米级氧化铝粉体，能有效的降低其烧结温度。

关键词

ABSTRACT
 In this paper, alumina ceramics in the aerospace, aviation, engine wear-resistant parts, electronic ceramics, knives, etc. are widely used. With the alumina ceramic expanding market demand, alumina ceramic sintering technology innovation has been going on. In recent years, the development of alumina ceramics mainly concentrated in the lower sintering temperature of alumina ceramic to reduce energy consumption, reduce the firing cycle, to reduce wear and tear, such as furnace and kiln areas.
 Alumina ceramics to modern requirements, that is, to reduce costs in the conditions, use of effective methods to make alumina ceramic at a lower temperature sintering densification. In this paper, the design of their predecessors based on CuO-TiO2 composite auxiliary aids and glass for the additives, the use of sol-gel method at low temperature synthesis of nano-alumina powder, and the use of high-temperature DTA-404PC DTA and WRT -3P micro-thermal balance of the dry gel analyzer for differential thermal (DTA) -weight loss (TG) analysis, test the atmosphere for air, heating rate of 10 ℃ • min-1. The use of ARL XTRA X-ray diffraction carried out on the powder phase analysis,Cu Kα radiation (λ = 0.15406 nm), tube voltage 40 kV, tube flow 80 mA, measurement range 2θ = 10-80 °. Add the powder ultrasonic dispersion in ethanol 10min, and then placed in the use of copper-line transmission electron microscopy observation. The results showed that, through the preparation of the above-mentioned additive powders of nano-alumina, can effectively reduce the sintering temperature.

Keywords：Sol-gel; Al2O3; Nanopowder; Synthesis at Low Temperature