| 摘要 |
An aluminum nitride sintered body is provided, including a polycrystalline structure in which grain boundary fracture toughness K<SUB>IC</SUB><SUP>gb </SUP>is 1.6 MPa.m<SUP>1/2 </SUP>or more. The grain boundary fracture toughness K<SUB>IC</SUB><SUP>gb </SUP>is determined by the equation K<SUB>IC</SUB><SUP>gb</SUP>=K<SUB>IC</SUB>.cos<SUP>2</SUP>(pi.PIF/200), wherein K<SUB>IC </SUB>is fracture toughness (MPa.m<SUP>1/2</SUP>), and PIF is a percentage of the intergranular fracture (%).
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