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 1230620
HIGH THERMAL CONDUCTIVITY ALUMINUM NITRIDE CERAMIC BODY ABSTRACT OF THE DISCLOSURE A process for producing a polycrystalline aluminum nitride ceramic body having a composition defined and encompassed by line ABCDEFA but not including lines CD and EF of Figure 1, a porosity of less than about 10% by volume of said body and a thermal conductivity greater than 1.0 W/cm.K at 22°C which comprises forming a mixture comprised of aluminum nitride powder and an yttrium additive selected from the group consisting of yttrium, yttrium hydride, yttrium nitride and mixtures thereof, said aluminum nitride and yttrium additive having a predetermined oxygen content, said mixture having a composition wherein the equivalent % of yttrium, aluminum, nitrogen and oxygen is defined and encompassed by line ABCDEFA but not including lines CD and EF in Figure 1, shaping said mixture into a compact and sintering said compact at a temperature ranging from about 1850°C to about 2170°C in an atmosphere selected from the group consisting of nitrogen, argon, hydrogen and mixtures thereof to produce said polycrystalline body.
468028
Bobik Carl F.
Huseby Irvin C.
Company General Electric
Eckersley Raymond A.
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