HIP'ing of Silicon Nitride with a Small Quantity of BeAl<sub>2</sub>O<sub>4</sub>

Abstract

Listen

Translate article

Silicon nitride with a small quantity (0.1, 0.3 and 1wt%) of BeAl2O3 was sintered by HIP. Properties of sintered bodies were studied through measurement of bulk density, 4-point bending test and so forth. The bulk density of the sintered body containing 0.3wt% BeAl2O3 was almost theoretical when sintered above 1900°C at an applied pressure of 200MPa for 1.5h. Strength of Si3N4 containing 1wt% BeAl2O3 did not drop at all up to 1200°C. For less than 0.3wt% addition, a rise of strength was measured at high temperature (1200°C).