Manufacturing method of honeycomb structure

Patent metadata

Field	Value
Publication number	US-10022715-B2
Application number	US-201715434365-A
Country	US
Kind code	B2
Filing date	Feb 16, 2017
Priority date	Feb 29, 2016
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

The manufacturing method of the honeycomb structure includes a raw material preparing step of adding the powder of porous silica as the inorganic pore former to a forming raw material and kneading the forming raw material to prepare the kneaded forming raw material, an extruding step of extruding the obtained forming raw material to form a honeycomb formed body, and a firing step of firing the extruded honeycomb formed body to form a honeycomb structure containing a cordierite component, and an amount of oil to be absorbed by the porous silica to be added to the forming raw material is in a range of 50 to 190 ml/100 g, and a BET specific surface area of the porous silica is in a range of 340 to 690 m2/g.

First claim

What is claimed is:

1. A manufacturing method of a honeycomb structure comprising:
a raw material preparing step of adding powder of porous silica as an inorganic pore former to a forming raw material and kneading the forming raw material to prepare the kneaded forming raw material;
an extruding step of extruding the obtained forming raw material to form a honeycomb formed body; and
a firing step of firing the extruded honeycomb formed body to form the honeycomb structure containing a cordierite component and having partition walls defining a plurality of cells which become through channels for a fluid and extend from one end face to the other end face,
wherein the porous silica is characterized by an oil absorption amount in a range of 50 to 190 ml/100 g as measured by JIS K5101-13-1 or JIS K5101-13-2, and
a BET specific surface area of the porous silica is in a range of 340 to 690 m 2 /g.

2. The manufacturing method of the honeycomb structure according to claim 1 , wherein a bulk density of the porous silica is in a range of 0.15 to 0.64 g/cm 3 .

3. The manufacturing method of the honeycomb structure according to claim 1 , wherein a 50% particle diameter (D 50 ) of the porous silica is in a range of 4 to 24 μm.

4. The manufacturing method of the honeycomb structure according to claim 1 , wherein a honeycomb porosity of the honeycomb structure is in a range of 40 to 55%.

5. The manufacturing method of the honeycomb structure according to claim 1 ,
wherein in the firing step, the porous silica is molten, reacts with another component contained in the forming raw material to be converted into cordierite, and constitutes a part of the honeycomb structure.

Assignees

• Ngk Insulators Ltd

Inventors

• Nobiki Kosuke

Classifications

• B01J21/08 Primary

  Silica · CPC title

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J37/0009

  Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst · CPC title

• C04B38/08 Primary

  by adding porous substances · CPC title

• B28B3/269

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