| 摘要 |
Macrocrystals of alpha alumina in the form of monocrystalline hexagonal platelets. The invention also relates to a process for the manufacture of these macrocrystals by calcination of alumina, for example transition alumina, and in the presence of a fluorine-containing flux, at a relatively low temperature. The macrocrystals of alpha alumina can be employed as reinforcing materials. |
