Method for preparing AlON transparent ceramic through low-temperature rapid pressureless sintering

The invention relates to a method for preparing AlON transparent ceramic through low-temperature rapid pressureless sintering, and belongs to the field of preparation of transparent ceramic materials. A method for preparing AlON transparent ceramic through low-temperature rapid pressureless sintering is characterized in that only 0.15-0.40 wt.% of La2O3 is added into AlON powder to serve as a sintering aid, the particle size of the powder is regulated through ball milling, and AlON/La2O3 mixed powder is obtained; the preparation method comprises the following steps: preparing AlON ceramic with high density and high infrared transmittance from AlON powder and La2O3 powder in a ball-milling manner under a nitrogen atmosphere by adopting pressureless sintering, the D50 of the ball-milled AlON/La2O3 mixed powder is 0.8-2.2 [mu] m, and the particle size distribution range is 0.3-7 [mu] m, lt; the content of particles with the particle size of 0.5 mu m is 1t; 5 vol.%, gt; the particle content of 4 microns is 1t; %,