Method for preparing polycrystalline aluminum oxynitride having enhanced transparency

摘要

Disclosed is a method for preparing polycrystalline aluminum oxynitride having enhanced transparency, and preparing polycrystalline aluminum oxynitride by sintering a powder mixture of Al2O3 and AlN under atmospheric pressure, wherein the content of AlN is set to 17 to 26 mol %, a first sintering is performed at 1,575° C. to 1,675° C. so as to enable raw-material powders to have a relative density of 95% or higher, and a second sintering is performed so as to enable the raw-material powders to have a higher relative density.

主权项

1. A method for preparing transparent polycrystalline aluminum oxynitride (AlON) that a powder mixture of aluminum oxide (Al2O3) and aluminum nitride (AlN) is sintered under an atmospheric pressure, the method comprising:
performing first sintering at a temperature from 1575° C. to 1675° C. such that a relative density is equal to or higher than 95% and the content of pure AlN is in a range from 17 to 26 mol %; and performing second sintering at a temperature from 1900° C. to 2050° C. such that a relative density higher than that in the first sintering is obtained, wherein a visible-light transmittance of a specimen having a thickness of 1.5 mm, which is obtained by the second sintering, is equal to or higher than 83%.