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US 12,559,425 B2Granted
Ceramic body and method for producing same, heater element, heater unit, heater system as well as purification system
AssigneeNGK Insulators, Ltd.
InventorsToru Hayase, Hirofumi Yamaguchi, Masaaki Masuda, Yukio Miyairi
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Abstract
A ceramic body being configured of mainly BaTiO3-based crystalline particles in which a part of Ba is substituted with at least one rare earth element, wherein the ceramic body contains Ba6Ti17O40 crystalline particles of from 1.0 to 10.0% by mass.
Claims22
A ceramic body being configured of mainly BaTiO3-based crystalline particles in which a part of Ba is substituted with at least one rare earth element, wherein the ceramic body comprises Ba6Ti17O40 crystalline particles of from 1.0 to 10.0% by mass.
A method for producing a ceramic body, comprising:
- a forming step of forming a green body containing a ceramic raw material comprising BaCO3 powder, TiO2 powder, and powder of rare earth nitrate and/or hydroxide to produce a ceramic formed body having a relative density of 60% or more;
- and
- a firing step of maintaining the ceramic formed body at a temperature of from 1150 to 1250° C., and then increasing the temperature to a maximum temperature of from 1360 to 1430° C. at a heating rate of from 20 to 500° C./hour and maintaining the maximum temperature for 0.5 to 5 hours;
- wherein the ceramic body is configured of mainly BaTiO3-based crystalline particles in which a part of Ba is substituted with at least one rare earth element, and
- wherein the ceramic body comprises Ba6Ti17O40 crystalline particles of from 1.0 to 10.0% by mass.
2 more elements
Dependencies are inferred from the claim text.