公开(公告)号：US5905048A

公开(公告)日：1999-05-18

申请号：US938153

申请日：1997-09-26

申请人： Michiko Kusunoki ,  Masumi Rokkaku ,  Yuichi Ikuhara

发明人： Michiko Kusunoki ,  Masumi Rokkaku ,  Yuichi Ikuhara

IPC分类号： C01F7/02 ,  C01F7/16 ,  C04B35/111 ,  C04B35/65 ,  C04B35/10

CPC分类号： C01F7/02 ,  C04B35/111 ,  C04B35/65 ,  C01P2002/85 ,  C01P2004/04 ,  C01P2006/33 ,  C01P2006/90

摘要： To provide a high-temperature stable transition-type alumina that does not undergo transformation into .alpha.-alumina even at high-temperature exceeding 1300.degree. C., and a method for producing the transition-type alumina.A metal aluminum block is placed on a block of .alpha.-alumina composed of Al.sub.2 O.sub.3. Portions of the .alpha.-alumina block and the metal aluminum block close to their boundary was strongly heated by contacting the flame of burning gas with the portions. Alumina and a relatively small amount of magnesium are thereby vaporized, and allowed to react with oxygen in the atmosphere, thereby obtaining a transition-type alumina that contains a small amount of magnesium in the crystal structure. The transition-type alumina obtained by this method is substantially of single crystal type, and does not undergo transformation into .alpha.-alumina even at high temperatures exceeding 1300.degree. C. and, further, exceeding 1400, but retains a complete transition-type crystal configuration such as .delta.-alumina and .theta.-alumina and the like.

摘要翻译： 提供即使在高于1300℃的高温下也不会转变成α-氧化铝的高温稳定的过渡型氧化铝，以及用于制造过渡型氧化铝的方法。 将金属铝块放置在由Al 2 O 3组成的α-氧化铝块上。 通过使燃烧气体的火焰与部分接触，强烈地加热部分α-氧化铝块和金属铝块靠近其边界。 氧化铝和相对少量的镁由此气化，并使其与大气中的氧反应，从而获得在晶体结构中含有少量镁的过渡型氧化铝。 通过该方法获得的过渡型氧化铝基本上是单晶型，即使在超过1300℃的高温下也不会转变成α-氧化铝，并且进一步超过1400，但保留了完全的过渡型晶体构型 例如δ-氧化铝和θ-氧化铝等。