Ngk Insulators, Inc.

Daniel Yukichi Kitaguchi

Takeshi Tokunaga

Takehiko Watanabe

Toshihiro Fukui

Nobuyuki Kashiwagi

Kouhei Kato

Shotaro Matsumoto

A method for estimating characteristics of a ceramic fired body, the method including: preparing a ceramic fired body by firing a formed green body; measuring a color of the ceramic fired body; and with use of a correlation between the color and at least one characteristic selected from a group consisting of a porosity, a pore diameter, and a thermal expansion coefficient previously determined for a ceramic fired body having a same composition as that of the ceramic fired body, estimating the at least one characteristic of the ceramic fired body from the color of the ceramic fired body, measured in the previous step.

Method for estimating characteristics of ceramic fired body

A honeycomb formed body containing a ceramics raw material, the honeycomb formed body including: a pillar shaped honeycomb structure portion having a plurality of rectangular cells, the cells being defined by partition walls and extending from a first end face to a second end face to form flow paths; an outer peripheral portion having outer peripheral portions X where the partition walls are covered with an outer peripheral wall; and outer peripheral portions Y where the partition walls are exposed. Each of the outer peripheral portions X includes a tapered portion having a gradually deceasing thickness of the outer peripheral wall toward a boundary portion with an adjacent outer peripheral portion Y. The tapered portion requires a length equal to or more than one time of an average cell pitch in the outer peripheral direction until thickness of the outer peripheral wall is halved.

Honeycomb formed body and method for producing honeycomb structure

The present disclosure is related to a method of producing a fired ceramic article. The method may include: heating a ceramic green body in a kiln, and controlling oxygen concentration in the kiln such that the oxygen concentration swings during the heating of the ceramic green body.

Method of producing fired ceramic article and method of firing ceramic green body

A manufacturing method of a honeycomb structure includes a forming step of forming a honeycomb formed body by use of a kneaded material containing a cordierite forming raw material, a slurry coating step of coating a coating layer forming slurry which contains a cordierite forming raw material on four regions in a rotation area when each of two straight lines passing through the center of gravity of the cross section and extending in a diagonal direction of main quadrangular cells is rotated in a range of &#xb1;x&#xb0; of the center of gravity in a circumferential surface, and a firing step of firing the honeycomb formed body on which the slurry is coated. The value x is in a range of 7 to 45, and the slurry is adjusted so that the coating layer has a porosity higher than that of the honeycomb structure body as much as 5% or more.

Manufacturing method of honeycomb structure, and honeycomb structure

The manufacturing method of the honeycomb structure includes a mounting step of mounting an extruded honeycomb formed body on a firing setter disposed on a shelf plate, and a firing step of firing the honeycomb formed body mounted on the firing setter to form the honeycomb structure, and in the mounting step, the firing setter is used in which a value obtained by dividing an area of a formed body end face of the honeycomb formed body by an area of a honeycomb mounting surface of the firing setter which faces the formed body end face and at least a part of which comes in contact with the formed body end face is in a range of 2.5 to 20.0.

Manufacturing method of honeycomb structure

A manufacturing method of a honeycomb structure includes a forming step of forming a honeycomb formed body having partition walls defining a plurality of cells, a convex wall portion forming step of forming a convex wall portion in the obtained honeycomb formed body, a mounting step of directing downward one end face on which the convex wall portion is formed and mounting the honeycomb formed body on a shelf plate, a firing step of firing the honeycomb formed body mounted on the shelf plate, to form a honeycomb fired body, and a circumference grinding step of grinding a circumferential surface of the honeycomb fired body, to remove the convex wall portion.

Manufacturing method of honeycomb structure and honeycomb formed body

A manufacturing method of the honeycomb structure has a forming step of forming a honeycomb formed body having partition walls defining a plurality of cells; a convex end portion forming step of forming a convex end portion including a convex end face in the obtained honeycomb formed body; a mounting step of directing downward one end face on which the convex end portion is formed and mounting the honeycomb formed body on a shelf plate; a firing step of firing the honeycomb formed body mounted on the shelf plate to form a honeycomb fired body; and an end face grinding step of grinding one end face of the honeycomb fired body to remove the convex end portion.

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Nagoya, Japan

Daniel Yukichi Kitaguchi