Patent ID: 6025290
Filing Date: 2000-02-15
Classification: C04B

Abstract:
A ceramic having a low heat conductivity comprising:30 to 84 wt. % of a silicon nitride forming a matrix,15 to 60 wt. % of a composite oxide selected from the group consisting of 3Al.sub.2 O.sub.3 --2SiO.sub.2, 2MgO--2Al.sub.2 O.sub.3 --5SiO.sub.2, 2MgO--SiO.sub.2 and 4MgO--5Al.sub.2 O.sub.3 --2SiO.sub.2, andan oxide of a transition metal element present in an amount less than 10 wt. %, the transition metal element having an atomic number in the range of from 66 to 75, the oxide of the transition metal element being dispersed in said matrix.