Ceramic formed body extrusion method, ceramic formed body, and ceramic porous body

Patent metadata

Field	Value
Publication number	US-10632648-B2
Application number	US-201916526026-A
Country	US
Kind code	B2
Filing date	Jul 30, 2019
Priority date	Mar 30, 2016
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

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.

First claim

The invention claimed is:

1. 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%.

2. The ceramic porous body according to claim 1 , wherein the porosity of the partition walls is 65% or less.

Assignees

• Ngk Insulators Ltd

Inventors

• Kimata Takafumi
• Hidaka Kenichi
• Kikuchi Yoshio
• Ishikawa Masaki
• Yamamoto Kisuke
• Morimoto Kenji

Classifications

• B28B11/16

  for extrusion {or for materials supplied in long webs} · CPC title

• B28B2003/203

  for multi-channelled structures, e.g. honeycomb structures · CPC title

• B28B3/26 Primary

  Extrusion dies · CPC title

• B28B3/269 Primary

  For multi-channeled structures, e.g. honeycomb structures · CPC title