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Synthesis of a m m oniu m alu min u m carbonate hydroxide ( A A C H) w as investigated usinga m m oniu m alu min u m sulfate and a m moniu m hydro carbonate as the starting m aterials . Itw as found that A A C Hcan be synthesized by adding a m m oniu m alu m inu m sulfate solution torapidly stirred a m moniu m hydro - carbonate solution at a tem perature of 30 ℃. A A C Hcantransfor m to α Al2 O3 co m pletely by calcining at 1100 ℃ for 1 hour , and the obtained po w ders , with a particle size of 100 n m , can be sintered to 98 99 % relative density at 1500 ℃for 2 hours .
Synthesis of amm oniu m alu min um carbonate hydroxide (AACH) w as investigated using a mm oniu m alu min um sulfate and am moniu m hydro carbonate as the starting m aterials. Itw as found that AAC Hcan be synthesized by adding amm oniu m alu AAC Hcantransfor m to α Al 2 O 3 co m pletely by calcining at 1100 ° C for 1 hour, and the obtained po w ders, with a particle size of 100 nm, can be sintered to 98 99% relative density at 1500 ° C for 2 hours.