Patent ID: 6242374
Filing Date: 2001-06-05
Classification: C04B

Abstract:
A high thermal conductive silicon nitride sintered body characterized by containing: 2.0 to 17.5% by weight of a rare earth element in terms of the amount of an oxide thereof; 0.3 to 3.0% by weight of Mg in terms of the amount of an oxide thereof; and at most 0.3% by weight of Al, Li, Na, K, Fe, Ba, Mn and B as impurity cationic elements in terms of total amount thereof, comprising a silicon nitride catalyst and a grain boundary phase, and having a ratio of a crystal compound phase formed in the grain boundary phase to the entire grain boundary phase of at least 20%, wherein said high thermal conductive silicon nitride sintered body has a thermal conductivity of 70 W/m.multidot.K or more.