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, including the steps of pre-firing a non-fired long ceramic body at a first temperature for a sufficient time to achieve a shrinkage ratio in the body of 5% to 95%, thereby forming a pre-fired ceramic body, hanging the pre-fired ceramic body in a substantially vertical direction inside a sheath while maintaining a spacing between the pre-fired ceramic body and the sheath, applying a downward load to the pre-fired ceramic body at a position proximate the bottom end thereof, and firing the pre-fired body at a second temperature for a sufficient time to sinter the pre-fired ceramic body.
Claims13
A method for producing a long ceramic body, comprising the steps of:
- pre-firing a non-fired long ceramic body at a first temperature for a sufficient time to achieve a remaining shrinkage ratio in the body of 5% to 95%, thereby forming a pre-fired ceramic body;
- hanging the pre-fired ceramic body in a substantially vertical direction inside a sheath while maintaining a spacing between the pre-fired ceramic body and the sheath;
- applying a downward load to the pre-fired ceramic body at a position proximate the lower end thereof;
- and
- firing the pre-fired body at a second temperature for a sufficient time to sinter the pre-fired ceramic body.
A method for producing a long ceramic body, comprising the steps of:
- pre-firing a non-fired long ceramic body at a first temperature for a sufficient time to achieve a remaining shrinkage ratio in the body of 5% to 95%, thereby forming a pre-fired ceramic body;
- hanging the pre-fired ceramic body in a substantially vertical direction inside a sheath while maintaining a spacing between the pre-fired ceramic body and the sheath;
- applying a downward load ranging from 0.005 to 0.008 MPa to the pre-fired ceramic body at a position proximate the lower end thereof;
- and
- firing the pre-fired ceramic body at a second temperature for a sufficient time to sinter the pre-fired ceramic body.
A method for producing a long ceramic body, comprising the steps of:
- pre-firing a non-fired long ceramic body at a first temperature for a sufficient time to achieve a remaining shrinkage ratio in the body of 5% to 95%, thereby forming a pre-fired ceramic body;
- hanging the pre-fired ceramic body in a substantially vertical direction inside a sheath while maintaining a spacing between the pre-fired ceramic body and the sheath;
- applying a downward load to the pre-fired ceramic body at a position proximate the bottom end thereof;
- and
- firing the pre-fired ceramic body at a second temperature for a sufficient time to sinter the pre-fired ceramic body, thereby forming a sintered ceramic body;
- whereby the sintered ceramic body has a straightness over its entire length of 0.1 mm or less.
Dependencies are inferred from the claim text.