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

1984-10-29

1987-04-07

Pertilla, Theodore E.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

4273762, 4273763, 427404, 4274191, 4274192, 428375, 428388, 428389, 428426, 428428, 428432, 428433, B32B 1706, B05D 302, F16L 910

Patent

active

046560718

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), Kirchner

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