ALUMINUM NITRIDE-BASED POWDER AND METHOD FOR PRODUCING SAME

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[Problem] To provide an aluminum nitride-based powder, in which the content of fine powder particles that cannot be removed is small and which has an excellent property to be filled in a polymeric material and excellent heat conductivity. [Solution] An aluminum nitride-based powder composed of aluminum nitride-based particles, said powder being characterized in that : (1) the average particle diameter D50 is 15 to 200 μm; (2) the content of particles each having a particle diameter of 5 μm or less is 60% or less in terms of the number of particles; (3) the content of an alkali earth metal element and a rare earth element is 0.1% by weight or less; (4) the content of oxygen is 0.5% by weight or less; (5) and the content of silicon is 1000 ppm by weight or less and the content of iron is 1000 ppm by weight or less.