Low temperature, pressureless sintering of silicon nitride

Details Low temperature, pressureless sintering of silicon nitride Low temperature, pressureless sintering of silicon nitride

C - Chemistry, Metallurgy

04

B

C04B 35/584 (2006.01)

Patent

CA 2178819

A silicon nitride-based powder composition that yields sintered bodies having a density of at least 3.15g/cm3 by pressureless sintering. The composition includes silicon nitride and an amount of bismuth oxide as a phase transition aid in addition to magnesium oxide, aluminium oxide, zirconium oxide and, optionally, silicon dioxide. The sintered bodies can be produced at temperatures of 1650 ~C or less.

Composition de poudre à base de nitrure de silicium, qui produit des corps frittés ayant une densité d'au moins 3,15 g/cm?3¿ par frittage de poudre non comprimée. Ladite composition comporte du nitrure de silicium et une certaine quantité d'oxyde de bismuth en tant qu'auxiliaire de la phase de transition, en plus d'oxyde de magnésium, d'oxyde d'aluminium, d'oxyde de zirconium et, éventuellement, de dioxyde de silicium. Les corps frittés peuvent être produits à des températures de 1650 ~C ou moins.

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