Process for producing long ceramic body
AssigneeNGK Insulators, Ltd.
InventorMitsuru Hattori
Life of this patent
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Abstract
A method for producing a long ceramic body with lower shape fluctuations and higher shape accuracy, by controlling the deformation of the long ceramic body, includes firing a long non-sintered ceramic body which has been suspended in a sheath so as not to contact directly the interior surface of the sheath, at a sufficient temperature and for a sufficient time until sintering is completed; inverting the long body; and re-firing the long body at a sufficient temperature for re-sintering the same. A predetermined downward load is applied to the long body in the vicinity of the bottom thereof during re-firing.
Claims16
A method for producing a long sintered ceramic body, comprising the steps of:
- a) providing a long non-sintered ceramic body having upper and lower ends;
- b) providing a sheath having an interior surface;
- c) suspending said non-sintered body in said sheath so that said non-sintered body does not directly contact said interior surface whereby said lower end lies above said upper end;
- d) firing said suspended non-sintered body at a sufficient temperature and for a sufficient time to sinter said non-sintered body;
- e) inverting the sintered body obtained in step d) such that said upper end lies above said lower end and applying a downward load thereto near the lower end thereof;
- and then
- f) re-firing the sintered body at a sufficient temperature and for a sufficient time to re-sinter the body.
Dependencies are inferred from the claim text.