Sintered ceramic body for a spark plug insulator and method...

Details Sintered ceramic body for a spark plug insulator and method... Sintered ceramic body for a spark plug insulator and method...

C - Chemistry, Metallurgy

04

B

C04B 35/58 (2006.01) C04B 35/10 (2006.01) C04B 35/597 (2006.01) C04B 35/64 (2006.01) H01T 13/38 (2006.01)

Patent

CA 2053706

In a sintered ceramic body used for a spark plug insulator, the ceramic body has silicon nitride (Si3N4), aluminum nitride (AlN) and alumina (Al2O3). Reduced weight percentage of the silicon nitride (Si3N4), aluminum nitride (AlN) and alumina (Al2O3) in the sintered ceramic body falls within an area surrounded by points A (91.5, 1.5, 7.0), B (91.5, 2.5, 6.0), C (91.5, 3.5, 5.0), F (83.0, 7.0, 10.0), J (66.0, 14.0, 20.0), O (50.0, 20.5, 29.0), T (41.0, 24.0, 35.0), S (41.0, 17.0, 42.0), R (41.0, 10.0, 49.0), M (50.0, 8.5, 41.5), H (66.0, 6.0, 28.0), D (83.0, 3.0, 14.0) and A (91.5, 1.5, 7.0) at a three-component diagram. As one sintering additive, yttrium oxide (Y2O3) is selected, weight percentage of the sintering additive ranges from 0.3 % to 15.0 % of the total weight of the silicon nitride (Si3N4), aluminum nitride (AlN) and alumina (Al2O3).

Dans un corps céramique fritté, utilisé pour isolant de bougie, ledit corps renferme du nitrure de silicium (Si3N4), du nitrure d'aluminium (AlN) et de l'alumine (Al2O3). Le pourcentage réduit en poids de nitrure de silicium (Si3N4), de nitrure d'aluminium (AlN) et d'alumine (Al2O3) dans le corps céramique fritté se situe dans une zone délimitée par les points A (91.5, 1.5, 7.0), B (91.5, 2.5, 6.0), C (91.5, 3.5, 5.0), F (83.0, 7.0, 10.0), J (66.0, 14.0, 20.0), O (50.0, 20.5, 29.0), T (41.0, 24.0, 35.0), S (41.0, 17.0, 42.0), R (41.0, 10.0, 49.0), M (50.0, 8.5, 41.5), H (66.0, 6.0, 28.0), D (83.0, 3.0, 14.0) et A (91.5, 1.5, 7.0) sur le diagramme à trois composantes. Avec la sélection de l'oxyde d'yttrium (Y2O3) comme additif de frittage, le pourcentage en poids d'additif de frittage varie de 0,3 à 15,0 % du poids total du nitrure de silicium (Si3N4), du nitrure d'aluminium (AlN) et de l'alumine (Al2O3).

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