C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/1, 25/128
C04B 35/58 (2006.01) C04B 35/581 (2006.01)
Patent
CA 1261887
ABSTRACT OF THE DISCLOSURE The invention is a molded body of polycrystalline aluminum nitride having a density of at least 99.8% TD and comprising: at least 99 % by weight AlN up to 0.35 % by weight residual oxygen up to 0.35 % by weight residual carbon and up to 0.30 % by weight metallic impurities (Fe, Si, Ca, Mg). In the molded body, the aluminum nitride is present in the form of a single phase, homogeneous, isotropic microstructure having a maximum grain size of 5 µm. The residual oxygen and the residual carbon are present in the form of a solid solution in the aluminum nitride lattice and ceramographically not detectable as separate phase(s) up to a magnification of 2400 times. The molded bodies have a bending stength measured according to the 4-point method, at room temperature and up to about 1400°C, of at least 500 N/mm2, a predominantly transcrystalline rupture mode and a thermal conductivity at 300 K of at least 150 W/mK. The molded body is produced from a porous, deoxidized green body having a maximum density of 70% TD and the same chemical composition as the final product, by isostatic hot pressing in a vacuum sealed casing at a temperature of from 1700° to 2100°C and a pressure of from 100 to 400 MPa in a high-pressure zone using an inert gas as a pressure transmitting agent. -30-
531798
Grellner Wolfgang
Hunold Klaus
Lipp Alfred
Mohr Max
Schwetz Karl-Alexander
Elektroschmelzwerk Kempten G.m.b.h.
Ridout & Maybee Llp
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