Outer periphery coating material, outer periphery coated honeycomb structure and dust collecting filter

Patent metadata

Field	Value
Publication number	US-11266942-B2
Application number	US-201916527522-A
Country	US
Kind code	B2
Filing date	Jul 31, 2019
Priority date	Sep 20, 2018
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

An outer periphery coating material being coated onto an outer peripheral surface of a ceramic honeycomb structure to form an outer periphery coated layer. The outer periphery coating material comprises: a particle mixture containing cordierite particles and amorphous silica particles in a mass ratio of from 40:60 to 80:20; and from 10 to 30% by mass of crystalline inorganic fibers in an outer percentage relative to the particle mixture. An average particle diameter of the cordierite particles is different from an average particle diameter of the amorphous silica particles.

First claim

What is claimed is:

1. An outer periphery coating material, the outer periphery coating material being coated onto an outer peripheral surface of a ceramic honeycomb structure to form an outer periphery coated layer,
wherein the outer periphery coating material comprises: a particle mixture containing cordierite particles and amorphous silica particles in a mass ratio of from 40:60 to 80:20; and from 10 to 30% by mass of crystalline inorganic fibers in an outer percentage relative to the particle mixture, and
wherein an average particle diameter of the cordierite particles is different from an average particle diameter of the amorphous silica particles.

2. The outer periphery coating material according to claim 1 , wherein the crystalline inorganic fibers have a fiber length of from 30 to 100 μm.

3. The outer periphery coating material according to claim 1 , wherein the average particle diameter of the amorphous silica particles is larger than the average particle diameter of the cordierite particles.

4. An outer periphery coated honeycomb structure, comprising:
a ceramic honeycomb structure; and
an outer periphery coated layer formed on at least a part of an outer peripheral surface of the ceramic honeycomb structure, the outer periphery coated layer being a coated and cured product of the outer periphery coating material according to claim 1 .

5. The outer periphery coated honeycomb structure according to claim 4 , wherein the outer periphery coated layer has a porosity of 40% or more.

6. The outer periphery coated honeycomb structure according to claim 4 , wherein the outer periphery coated layer has a coefficient of thermal expansion of from 0.60×10 −6 to 3.00×10 −6 /° C. in a temperature range of from 800 to 1000° C.

7. The outer periphery coated honeycomb structure according to claim 4 , wherein the outer periphery coated layer has a coefficient of thermal expansion of from 1.50×10 −6 to 2.50×10 −6 /° C. in a temperature range of from 40 to 1000° C.

8. The outer periphery coated honeycomb structure according to claim 4 , wherein the honeycomb structure comprises porous partition walls that define a plurality of cells extending from one end face to another end face to form flow paths for a fluid.

9. A dust collecting filter comprising the outer periphery coated honeycomb structure according to claim 4 .

Assignees

• Ngk Insulators Ltd

Inventors

• Houra Masaki
• Nagai Shungo

Classifications

• B01D39/2075 Primary

  sintered or bonded by inorganic agents · CPC title

• B01D46/2444

  of the outer peripheral sealing · CPC title

• B01D46/24494

  Thermal expansion coefficient, heat capacity or thermal conductivity · CPC title

• B01D46/24491

  Porosity · CPC title

• C04B41/4596

  with fibrous materials or whiskers · CPC title