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Tubular Alumina as a Key Component of New Thermally Stable Ceramic Materials

机译:管状氧化铝是新型热稳定陶瓷材料的关键成分

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摘要

Using scanning electron microscopy and X-ray diffraction, we have examined processes that occur in tubular alumina during heating in air to temperatures in the range 1100- 1200℃. The results demonstrate that, starting at temperatures between 600 and 700℃, α-Al_2O_3 (corundum) is formed in the solid material. Heating the tubular material to 1000℃ converts some of the starting alumina into x-Al_2O_3 and some into α-Al_2O_3. The samples calcined for 2-10 h at 1100℃ contain α-Al_2O_3 and æ-Al_2O_3. Heating to 1000- 1300℃ has no effect on the shape of the tubular particles. The ceramics obtained in this way are stable in contact with water. When tubular alumina with a SiCl_4 vapor hydrolysis product deposited on its surface is heat-treated at temperatures in the range 1100- 1300℃, we observe the formation of mullite (Al_2O_3 • 2SiO_2) on the surface of the tubular particles.
机译:使用扫描电子显微镜和X射线衍射,我们检查了管状氧化铝在空气中加热到1100-1200℃的温度期间发生的过程。结果表明,从温度600到700℃开始,在固态材料中形成α-Al_2O_3(刚玉)。将管状材料加热到1000℃会将一些起始氧化铝转化为x-Al_2O_3,另一些转化为α-Al_2O_3。在1100℃下煅烧2-10h的样品中含有α-Al_2O_3和æ-Al_2O_3。加热到1000-1300℃对管状颗粒的形状没有影响。以这种方式获得的陶瓷在与水接触时是稳定的。当对表面沉积有SiCl_4气相水解产物的管状氧化铝在1100-1300℃的温度范围内进行热处理时,我们观察到在管状颗粒表面形成了莫来石(Al_2O_3•2SiO_2)。

著录项

  • 来源
    《Inorganic materials》 |2014年第10期|997-1002|共6页
  • 作者单位

    Moscow State University, Moscow, 119992 Russia;

    Moscow State University, Moscow, 119992 Russia;

    Moscow State University, Moscow, 119992 Russia;

    Moscow State University, Moscow, 119992 Russia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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