公开(公告)号：US5322826A

公开(公告)日：1994-06-21

申请号：US891445

申请日：1992-05-29

申请人： Wolfgang Becker ,  Fred Brunk

发明人： Wolfgang Becker ,  Fred Brunk

IPC分类号： C04B35/101 ,  C04B35/64 ,  C04B35/66 ,  C25C3/08 ,  F27D1/00 ,  C04B35/10 ,  C04B35/46

CPC分类号： C04B35/1015 ,  C04B35/66 ,  C25C3/085 ,  Y02P10/262

摘要： The invention relates to a material which is refractory, porous, resistant to fluorine-containing gases, stable in its volume and heat-insulation, particularly in the form of formed bricks, for a refractory, heat-insulating lining in electrolytic cells, in which metal aluminum is extracted by electrolysis from aluminum oxide dissolved in a fluoride melt; the material has an Al.sub.2 O.sub.3 content of over 50 wt % and a TiO.sub.2 content of 2.5-10 wt % and during the action of fluorine-containing gases at temperatures between 700.degree. and 1000.degree. C. in the area of the material exposed to the fluorine gas, on free surfaces, particularly at the boundary surfaces of intergranular hollow spaces, needle-shaped TiO.sub.2 crystals and/or TiO.sub.2 -containing crystals are formed, growing without regularity into the porous space. The invention furthermore relates to a method for the manufacture as well as the use of the refractory material.

摘要翻译： 本发明涉及一种耐火材料，耐多孔的，耐含氟气体的材料，其体积和隔热性，特别是形成砖的形式，其用于电解槽中的耐火绝热衬里，其中 金属铝通过电解从溶解在氟化物熔体中的氧化铝提取; 该材料的Al2O3含量超过50重量％，TiO 2含量为2.5-10重量％，并且在含氟气体的作用下，在暴露于氟的材料的区域中，在700℃至1000℃的温度下 气体，在自由表面上，特别是在晶间中空空间的边界表面，形成针状TiO 2晶体和/或含TiO 2晶体，无规则地生长到多孔空间中。 本发明还涉及一种用于制造和使用耐火材料的方法。