现代工业对制作精密技术陶瓷用的氧气化铝要求晶粒度愈来愈细,用一般的方法难以达到这种要求。本发明制造低钠超细α型氧化铝的方法是以一般工业氧化铝或氢氧化铝为原料,添加0.03～0.4％的氟化物,不加或再添加少量的硼化物或氯化物,在1200～1500℃焙烧制成α型氧化铝,晶粒度在1微米左 Modern industry for the production of precision technical ceramics with oxygenated aluminum requires grain size more and more fine, with the general method is difficult to achieve this requirement. The method for producing low-sodium ultrafine α-alumina comprises the following steps: using general industrial alumina or aluminum hydroxide as raw materials, adding 0.03-0.4% of fluoride, adding or adding a small amount of boride or chloride at 1200 ~ 1500 ℃ calcined α-type alumina, the grain size of 1 micron left