Ngk Insulators, Inc.

Ngk Insulatros, Ltd.

Yoshiyuki Kamei

Chikashi Ihara

Shinya Yoshida

Takashi Goshima

Masato Shimada

Koichi Okada

A manufacturing method of a silicon carbide-based honeycomb structure, including a firing step of introducing extruded honeycomb formed bodies containing a silicon carbide-based component, together with firing members into a firing furnace, and firing the honeycomb formed bodies, to manufacture the silicon carbide-based honeycomb structure, wherein the firing members are formed by using a ceramic material containing 70 wt % or more of alumina, and the firing step further includes: an inert gas supplying step of supplying an inert gas to a furnace space of the firing furnace, and a gas adding step of adding a reducing gas to the furnace space.

Manufacturing method of silicon carbide-based honeycomb structure

An inert gas substituting method includes: a closing step of accommodating a honeycomb formed body in an indoor space of a gas substituting chamber and closing the same with airtightness from the outside being maintained; a pressure reducing step of reducing the pressure in the indoor space to a preset first vacuum pressure; a pressure increasing step of introducing argon gas into the pressure-reduced indoor space and increasing the pressure to a second vacuum pressure which is higher than the first vacuum pressure and lower than atmospheric pressure; a pressure re-reducing step of reducing the pressure to the first vacuum pressure again; and a pressure recovering step of repeating the pressure increasing step and the pressure re-reducing step at least twice, introducing argon gas into the indoor space in which the pressure has been reduced to the first vacuum pressure again, and recovering the pressure to atmospheric pressure.

Inert gas substituting method and ceramic structure manufacturing method using inert gas substituting method

A method for manufacturing a honeycomb structure includes the steps of: producing triangular segments as cut quadrangular prism honeycomb fired bodies in double by cutting half, forming a pseudo quadrangular segment by fitting a hollow auxiliary member whose outer peripheral shape is triangular on a cut triangular segment, disposing the honeycomb fired bodies and the pseudo quadrangular segments to form an assembly, bonding the assembly by applying a bonding material, and then applying pressure to thus bonded assembly to obtain a honeycomb block body with the hallow auxiliary members, drying the applied bonding material and then detaching the hollow auxiliary members to obtain a honeycomb block body, and grinding an outer peripheral portion of a resultant honeycomb block body to obtain a honeycomb structure.

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Nagoya, Japan

Yoshiyuki Kamei