Verfahren zur Herstellung von drucklos gesinterten Aluminiumnitrid-Keramiken mit hoher Waermeleitfaehigkeit

NOVELTY - A pressureless sintered aluminum nitride ceramic is produced using an exclusively boride sintering aid comprising scandium, yttrium, lanthanum, actinium and/or rare earth metal boride. DETAILED DESCRIPTION - A pressureless sintered aluminum nitride ceramic, with high thermal conductivity, is produced from a mixture of aluminum nitride powder and an exclusively boride sintering aid selected from borides of scandium, yttrium, lanthanum, actinium and rare earth metals optionally with other borides. When YB6 is used exclusively as the sintering aid, the mixture is sintered at not more than 1580 deg. C. USE - For producing pressureless sintered aluminum nitride ceramics useful as an electronic device substrate material. ADVANTAGE - Pressureless sintered aluminum nitride ceramics, having a satisfactorily high thermal conductivity (preferably at least 130 W/mK), are produced at reduced costs since the firing temperature and the firing time (e.g. less than 5 hour) are reduced.