Silicon nitride sintered body, method of preparing the same and

Details Silicon nitride sintered body, method of preparing the same and Silicon nitride sintered body, method of preparing the same and

1998-08-31

1999-12-14

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 973, 501 982, 264647, 264683, C04B 35591, C04B 35599

Patent

active

060017597

ABSTRACT:
A silicon nitride sintered body prepared through a nitriding reaction of Si, consists of crystal grains mainly composed of silicon nitride and/or SIALON and a grain boundary phase. The grain boundary phase includes a first component including at least one element selected from a group of Na, K, Mg, Ca and Sr and a second component including at least one element selected from a group of Y and lanthanoid series elements. The molar ratio of the first component to the second component is in the range of 1:1 to 6:1 in terms of oxides. The mean breadth and the mean length of the crystal grains are not more than 0.1 .mu.m and not more than 3 .mu.m respectively, and the standard deviation of the mean length in the sintered body is within 1.5 .mu.m. Especially, the mean breadth of the crystal grains is at least 0.4 .mu.m and not more than 0.9 .mu.m.

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