Process for preparing sintered aluminium nitride bodies.

摘要

A process for preparing aluminium nitride sintered bodies comprising starting with an aluminium nitride powder having the following characteristics: surface area not less than 2.5 m<2>/g: consisting of at least 95% by weight of aluminium nitride, wherein the bound oxygen content is at most 3% by weight, the total amount of metal or metal compound impurities being at most 0.6% by weight, and the silicon or carbon or compounds thereof being at most 0.5% by weight: homogeneously mixing said aluminium nitride with a sintering aid: then compacting the obtained mixture to form a body: and sintering the body with the following cycle: ramp temperature from room temperature to sintering temperature of at most 250 DEG C per hour: sintering temperature from 1600 to 1900 DEG C for at least 3 hours: and cooling the sintered body at a rate not more than 300 DEG C/hr. The sintered bodies thus obtained have high thermal conductivity and good consistency.