Ceramic bodies having a plurality of stress zones

Details Ceramic bodies having a plurality of stress zones Ceramic bodies having a plurality of stress zones

1987-06-30

1989-10-24

Pertilla, Theodore E.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428372, 428375, 428379, 428388, 428389, 428397, 428660, B32B 1700, D02G 300

Patent

active

048761486

ABSTRACT:
Ceramic bodies having a balanced overall stress pattern in which are present individual stress zones of compressive and tensile stresses and the techniques for forming said bodies are disclosed. The bodies are formed by having slightly different compositional patterns from one zone to another whereby during cooling there is a differential volumetric expansion or contraction in one zone as compared to an adjacent zone. The volumetric expansion or contraction is caused by a material which undergoes a phase transformation during the cooling from the sintering temperatures utilized to sinter the ceramic body, whereby such phase transformation is accompanied by a volumetric change.

REFERENCES:
patent: 3953636 (1976-04-01), Kircher

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