Patent ID: 7319080
Filing Date: 2008-01-15
Classification: C04B,H05K

Abstract:
1. An aluminum nitride sintered body comprising crystal grains of an average grain size (D 50 ) of 0.1 to 2.3 μm, and having a pore area ratio of not larger than 1×10 −7 , a pore density of not larger than 0.05 pores/mm 2 of pores having diameters of not smaller than 1 μm, and a Vickers' hardness in a range of 14 to 17 GPa, wherein said crystal grains have such a grain size distribution that a difference between the cumulative 90% grain size (D 90 ) and the cumulative 10% grain size (D 10 ) is not larger than 1.5 μm.