# US 2017/0282402 A1 · Ceramic formed body extrusion method, ceramic formed body, and ceramic porous body > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0282402 A1 - Document ID: US20170282402A1 - Status: Published application - Kind: A1 - Application number: 15/471,327 - Filed: 2017-03-28 - Published: 2017-10-05 - Earliest claimed: 2016-03-30 - Assignees: NGK Insulators, Ltd. - Applicants: Ngk Insulators, Ltd. - Inventors: Takafumi KIMATA; Kenichi HIDAKA; Yoshio KIKUCHI; Masaki ISHIKAWA; Kisuke YAMAMOTO; Kenji MORIMOTO - Web page: https://patentgrep.com/patent/US20170282402A1 ## CPC - B28B 3/269: {For multi-channeled structures, e.g. honeycomb structures} - B28B 3/26: Extrusion dies - B28B 11/16: for extrusion {or for materials supplied in long webs} - B28B 2003/203: {for multi-channelled structures, e.g. honeycomb structures} - B28B: SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER (foundry moulding B22C; working stone or stone-like material B28D; shaping of substances in a plastic state, in general B29C; making layered products not composed wholly of these substances B32B) ## Abstract A ceramic formed body extrusion method for forming a ceramic formed body having a wall-shaped or plate-shaped formed portion by using an extrusion die provided with a slit for extrusion of a ceramic formed body from a raw material for forming, the slit including a slit former stage unit located on an upstream side in an extrusion direction in the extrusion and a slit latter stage unit located on a downstream side in the extrusion direction, the slit latter stage unit having a width of three to 27 times a width of the slit former stage unit, and by extruding a raw material containing a first particle having an aspect ratio of two or more and less than 300 such that the raw material passes though the slit former stage unit of the extrusion die and then passes through the slit latter stage unit. ## Claims ### Claim 1 A ceramic formed body extrusion method for forming a ceramic formed body having a wall-shaped or plate-shaped formed portion, by using an extrusion die provided with a slit for extrusion of a ceramic formed body having a wall-shaped or plate-shaped formed portion from a raw material for forming, the slit including a slit former stage unit located on an upstream side in an extrusion direction in the extrusion and a slit latter stage unit located on a downstream side in the extrusion direction, the slit latter stage unit having a width of three to 27 times a width of the slit former stage unit, and by extruding a raw material containing a first particle having an aspect ratio of two or more and less than 300 such that the raw material passes though the slit former stage unit of the extrusion die and then passes through the slit latter stage unit. ### Claim 2 (depends on 1) The ceramic formed body extrusion method according to claim 1, wherein a length of the first particle is 50% or less of a width of the slit latter stage unit. ### Claim 3 (depends on 1) The ceramic formed body extrusion method according to claim 1, wherein the first particle is a pore former. ### Claim 4 (depends on 1) The ceramic formed body extrusion method according to claim 1, wherein an addition amount of the first particle is 70% by volume or less with respect to a whole of the raw material. ### Claim 5 (depends on 1) The ceramic formed body extrusion method according to claim 1, wherein the width of the slit latter stage unit is 8 mm or less. ### Claim 6 (depends on 1) The ceramic formed body extrusion method according to claim 1, wherein the length of the slit latter stage unit in the extrusion direction is 13 mm or less. ### Claim 7 (depends on 1) The ceramic formed body extrusion method according to claim 1, wherein the raw material contains at least one ceramic raw material selected from the group consisting of silicon carbide, cordierite, aluminum titanate, zirconia, aluminum oxide, a silicon carbide forming raw material, a cordierite forming raw material, an aluminum titanate forming raw material, and a zirconia forming raw material. ### Claim 8 (depends on 1) The ceramic formed body extrusion method according to claim 1, wherein the extrusion die has at least one introduction hole communicating with the slit and provided to introduce the raw material into the slit. ### Claim 9 (depends on 1) The ceramic formed body extrusion method according to claim 1, wherein the ceramic formed body is a honeycomb-shaped ceramic formed body having partition walls for defining a plurality of cells, and the partition wall is the wall-shaped or plate-shaped formed portion. ### Claim 10 (depends on 1) The ceramic formed body extrusion method according to claim 1, wherein the raw material contains a second particle having an aspect ratio of less than two, and the second particle is a pore former. ### Claim 11 A ceramic formed body with a wall-shaped or plate-shaped formed portion, comprising a first particle having an aspect ratio of two or more and less than 300, wherein in a dry state, among three regions obtained by equally dividing a cut surface obtained by cutting the formed portion in a thickness direction thereof into three parts in the thickness direction of the formed portion, the orientation degree of the first particle in a region located in the center in the thickness direction of the formed portion is from 0 to 53°. ### Claim 12 (depends on 11) The ceramic formed body according to claim 11, wherein a length of the first particle is 50% or less of a thickness of the formed portion. ### Claim 13 (depends on 11) The ceramic formed body according to claim 11, wherein the first particle is a pore former. ### Claim 14 (depends on 11) The ceramic formed body according to claim 11, wherein a content of the first particle is 45% by volume or less with respect to a whole of the raw material constituting the ceramic formed body. ### Claim 15 (depends on 11) The ceramic formed body according to claim 11, wherein the ceramic formed body is a honeycomb-shaped ceramic formed body having partition walls for defining a plurality of cells, and the partition wall is the wall-shaped or plate-shaped formed portion. ### Claim 16 (depends on 11) The ceramic formed body according to claim 11, further comprising a second particle having an aspect ratio of less than two, wherein the second particle is a pore former. ### Claim 17 A ceramic porous body comprising partition walls having a plurality of pores for defining a plurality of cells, wherein among three regions obtained by equally dividing a cut surface obtained by cutting the ceramic porous body in a thickness direction of the partition walls into three parts in the thickness direction of the partition walls, the orientation degree of the pores in a central region located in the center in the thickness direction of the partition walls is from 0 to 53°, and among the three regions, a difference between a porosity in a surface region outside the central region and a porosity of the partition walls is from 0 to 11%. ### Claim 18 (depends on 17) The ceramic porous body according to claim 17, wherein the porosity of the partition walls is 65% or less.