氧化鋁陶瓷的降溫燒結研究

材料科學論文編號:CL120  論文字數:15392,頁數:30

目  錄
中文摘要 i
英文摘要 ii
目錄 iii
第一章     概述 1
 1.1  氧化鋁陶瓷 1
 1.2  氧化鋁陶瓷的低溫燒結技術 1
      1.2.1   通過提高Al2O3粉體的細度與活性降低瓷體燒結溫度 2
      1.2.2   通過瓷料配方設計摻雜降低瓷體燒結溫度 3
      1.2.3   采用特殊燒成工藝降低瓷體燒結溫度 5
 1.3  納米氧化鋁的結構與應用 5
 1.3.1  納米氧化鋁概述 5
 1.3.2  納米氧化鋁結構 6
 1.3.3   納米氧化鋁的應用 6
       1.4  納米氧化鋁的制備方法 7
            1.4.1   固相法 7
            1.4.2   氣相法 7
            1.4.3   液相法 8
       1.5  納米氧化鋁制備存在的問題 8
 1.6  CuO和TiO2復相添加劑對氧化鋁陶瓷燒結性能的影響 8                 
 1.7  立題依據與研究內容 9
第二章      以CuO-TiO2氧化物助劑為先驅體的納米Al2O3的制備與表征 10
 2.1   實驗過程 10
 2.2   結果與討論 10
      2.2.1 干凝膠的差熱-失重分析 10
      2.2.2 粉體的物相分析 13
      2.2.3 粉體的微觀形貌 14
      2.2.4 粉體的激光粒徑分析 15
 2.3  結論 16
第三章     玻璃先驅體對溶膠-凝膠合成納米氧化鋁的影響 17
 3.1   實驗過程 17
 3.2  結果與討論 17
            3.2.1 干凝膠的差熱-失重分析 17
            3.2.2 干凝膠煅燒后的物相分析與粉體粒徑測算 19
            3.2.3 粉體的微觀形貌 20
            3.2.4 粉體的激光粒徑分析 21
 3.3  結論 22
第四章     結論 23
致謝 24
參考文獻 25

摘    要
 
 本文提出氧化鋁陶瓷在航天、航空、發動機耐磨部件、電子瓷、陶瓷閥芯、刀具等方面均得到廣泛應用。隨著氧化鋁陶瓷市場需求的不斷擴大，氧化鋁陶瓷燒結技術的革新也在不斷進行之中。近幾年來，氧化鋁陶瓷的發展主要集中在降低氧化鋁陶瓷的燒結溫度，降低能耗，縮短燒成周期，減少窯爐和窯具損耗等方面。
 對現代氧化鋁陶瓷的要求，就是在降低成本的條件下，利用各種有效的方法使氧化鋁陶瓷在更低的溫度下燒結致密。本文在前人的設計基礎上，以CuO-TiO2復合助劑和玻璃助劑為添加劑，采用溶膠-凝膠法低溫合成納米級氧化鋁粉體，并采用DTA-404PC高溫差熱分析儀和WRT-3P微量熱天平分析儀對干凝膠進行差熱（DTA)-失重（TG）分析，測試氣氛為空氣，升溫速率為10 ℃·min-1。采用ARL XTRA型X射線衍射儀對粉體進行物相分析，Cu Kα輻射(λ = 0.15406 nm)，管壓40 kV，管流80 mA，測量范圍2θ = 10~80°。將粉體放入無水乙醇中超聲波分散10min，然后置于銅網上利用透射電鏡進行觀察。結果發現，通過制備上述添加劑的納米級氧化鋁粉體，能有效的降低其燒結溫度。

關鍵詞

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