Method for preventing low-temperature degradation of...

C - Chemistry – Metallurgy – 04 – B

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C04B 35/486 (2006.01) C04B 41/00 (2006.01) C04B 41/80 (2006.01)

Patent

CA 2320830

A ceramic body having a surface region containing tetragonal zirconia is sintered to at least 95 % theoretical density at a temperature below about 1550 ~C. The surface region is then heat treated to reverse local stresses therein. Low temperature degradation in tetragonal zirconia, and materials containing tetragonal zirconia, is significantly inhibited. The heat treated ceramic is especially suited for use in structural components such as valves, engine housings, pistons (chambers) and the like which, during operation, are frequently exposed to temperatures ranging from room temperature to 500 ~C for prolonged periods of time.

Un corps céramique qui comporte une zone de surface contenant de la zircone tétragonale est fritté jusqu'à une densité théorique d'au moins 95 % à une température inférieure à environ 1550 ·C. On traite ensuite à chaud la zone de surface pour y inverser des contraintes locales. Ce qui permet d'inhiber de manière importante une dégradation à basse température de la zircone tétragonale et de matières contenant de la zircone tétragonale. La céramique traitée à chaud convient particulièrement pour être utilisée dans des éléments structurels tels que des soupapes, des logements de moteur, des (chambres de) pistons et analogue qui, au cours de leur fonctionnement, sont fréquemment exposés à des températures comprises entre une température ambiante et 500 ·C pendant des durées prolongées.

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