公开(公告)号：US20210270162A1

公开(公告)日：2021-09-02

申请号：US17147759

申请日：2021-01-13

Applicant: NGK Insulators, Ltd.

Inventor： Koichi SENDO ,  Yu TORII ,  Shuji UEDA ,  Shungo NAGAI

IPC: F01N3/022 ,  B01J35/04 ,  C04B38/00

Abstract: A honeycomb filter includes a pillar-shaped honeycomb structure body having a porous partition wall disposed to surround a plurality of cells which serve as fluid through channels extending from a first end face to a second end face; and a plugging portion provided at an open end on the first end face side or the second end face side of each of the cells, wherein the partition wall is composed of a material containing cordierite as a main component thereof, and a number per unit area of pores which exist at a surface of the partition wall and which have equivalent circle diameters exceeding 3.0 μm is 600 per mm2 or more.

公开(公告)号：US20210270161A1

公开(公告)日：2021-09-02

申请号：US17147741

申请日：2021-01-13

Applicant: NGK Insulators, Ltd.

Inventor： Koichi SENDO ,  Yu TORII ,  Shuji UEDA ,  Shungo NAGAI

IPC: F01N3/022 ,  B01J35/04 ,  C04B38/00

Abstract: A honeycomb filter includes a pillar-shaped honeycomb structure body having a porous partition wall disposed to surround a plurality of cells and a plugging portion provided at an open end on a first end face side or a second end face side of each of the cells, wherein the partition wall is composed of a material containing cordierite as a main component thereof, a number per unit area of pores which exist at a surface of the partition wall and which have equivalent circle diameters exceeding 3.0 μm is 1400 per mm2 or more, and, in a pore diameter distribution which indicates a cumulative pore volume of the partition wall, with a log pore diameter on a horizonal axis and a log differential pore volume (cm3/g) on a vertical axis, a half-value width of a first peak that includes a maximum value of the log differential pore volume is 0.30 or less.

公开(公告)号：US20200299201A1

公开(公告)日：2020-09-24

申请号：US16744538

申请日：2020-01-16

Applicant: NGK INSULATORS, LTD.

Inventor： Yukari KOMAI ,  Shungo NAGAI

IPC: C04B38/00 ,  C04B35/195

Abstract: A method for producing a ceramic honeycomb structure including: plugging ends of cells on one of a first end face side and a second end face side in each of the cells of a ceramic honeycomb formed body that includes partition walls defining the cells extending from the first end face to the second end face; placing the ceramic honeycomb formed body on a shelf board with the first end face facing downward; arranging at least one lid member on the second end face of the ceramic honeycomb formed body so as to completely cover the second end face; and placing the ceramic honeycomb formed body together with the shelf board and the lid member in a firing furnace and firing the ceramic honeycomb formed body.

公开(公告)号：US20240325957A1

公开(公告)日：2024-10-03

申请号：US18609308

申请日：2024-03-19

Applicant: NGK INSULATORS, LTD.

Inventor： Daiki TAKATA ,  Yusuke TSUCHIYA ,  Shungo NAGAI

IPC: B01D46/24 ,  B01D39/20 ,  B01D46/00

CPC classification number: B01D46/2496 ,  B01D39/2068 ,  B01D46/0001 ,  B01D46/2482 ,  B01D46/2484

Abstract: A pillar-shaped honeycomb structure filter, comprising a plurality of first cells extending from an inlet side end surface to an outlet side end surface, opening on the inlet side end surface and having a sealing portion on the outlet side end surface; and a plurality of second cells extending from the inlet side end surface to the outlet side end surface, having a sealing portion on the inlet side end surface and opening on the outlet side end surface, the plurality of first cells and the plurality of second cells alternately arranged adjacent to each other with a porous partition wall interposed therebetween; wherein a porous film composed of a plurality of particles is formed on a surface of each of the first cells, and the interparticle distance for the plurality of particles at which a cumulative ratio is 90% (D90) is 12.0 μm or less.

公开(公告)号：US20220267221A1

公开(公告)日：2022-08-25

申请号：US17451859

申请日：2021-10-22

Applicant: NGK Insulators, Ltd.

Inventor： Yu TORII ,  Shungo NAGAI

IPC: C04B38/00 ,  C04B38/06 ,  B01D46/24 ,  B01D46/00

Abstract: A honeycomb filter includes a pillar-shaped honeycomb structure body having a porous partition wall disposed to surround a plurality of cells and a plugging portion provided at an open end on a first end face side or a second end face side of the cells, wherein the partition wall is composed of a material containing cordierite as a main component, a porosity of the partition wall is 60 to 70%, an average pore diameter of the partition wall is 20 to 30 μm, an open porosity of pores existing at the partition wall surface and having equivalent circle diameters exceeding 1.5 μm is 31% or more, and, in a pore diameter distribution which indicates a cumulative pore volume of the partition wall, a half-value width of a first peak including a maximum value of a log differential pore volume is 0.20 or less.

公开(公告)号：US20210268422A1

公开(公告)日：2021-09-02

申请号：US17148896

申请日：2021-01-14

Applicant: NGK Insulators, Ltd.

Inventor： Koichi SENDO ,  Yu TORII ,  Shuji UEDA ,  Shungo NAGAI

IPC: B01D46/24

Abstract: A honeycomb filter includes a pillar-shaped honeycomb structure body having a porous partition wall disposed, surrounding a plurality of cells which serve as fluid through channels extending from a first end face to a second end face; and a plugging portion provided at an open end on the first end face side or the second end face side of each of the cells, wherein the partition wall is composed of a material containing cordierite as a main component thereof, an average pore diameter of the partition wall is 20 to 30 μm, an average equivalent circle diameter of pores existing at a surface of the partition wall and having equivalent circle diameters exceeding 3.0 μm is 18 to 30 μm, and a number per unit area of pores existing at a surface of the partition wall and having equivalent circle diameters exceeding 3.0 μm is 400 per mm2 or more.

公开(公告)号：US20200094183A1

公开(公告)日：2020-03-26

申请号：US16527522

申请日：2019-07-31

Applicant: NGK INSULATORS, LTD.

Inventor： Masaki HOURA ,  Shungo NAGAI

IPC: B01D46/24 ,  B01D39/20 ,  C04B38/00 ,  C04B41/00 ,  C04B41/87 ,  C04B41/50

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.

公开(公告)号：US20180222083A1

公开(公告)日：2018-08-09

申请号：US15874215

申请日：2018-01-18

Applicant: NGK INSULATORS, LTD.

Inventor： Shungo NAGAI ,  Hiroaki HAYASHI

IPC: B28B11/00 ,  B01D46/24 ,  B01D46/00

CPC classification number: B28B11/006 ,  B01D46/0001 ,  B01D46/2429 ,  B01D46/244 ,  B28B11/007 ,  B28B17/026 ,  C04B26/285 ,  C04B35/195 ,  C04B35/565 ,  C04B35/62635 ,  C04B38/0006 ,  C04B38/0012 ,  C04B2111/00793 ,  C04B2111/0081 ,  C04B2235/3217 ,  C04B2235/3218 ,  C04B2235/3418 ,  C04B2235/3481 ,  C04B2235/349 ,  F01N3/0222 ,  C04B38/068 ,  C04B38/067 ,  C04B38/0675 ,  C04B38/08 ,  C04B14/024 ,  C04B14/04 ,  C04B14/042 ,  C04B14/10 ,  C04B14/303 ,  C04B14/323 ,  C04B16/08 ,  C04B24/026

Abstract: A manufacturing method of a plugged honeycomb structure including a plugging material preparing step of mixing a ceramic raw material, a pore former, a thickener, an organic binder, a dispersing agent, and water and preparing the plugging material which is slurried, to form the plugging portions, wherein the plugging material preparing step includes: a powder mixing step of mixing the ceramic raw material, the pore former, the organic binder and the dispersing agent each of which is constituted of powder, at predetermined blend ratios, a thickener mixing step of adding and mixing the thickener to a powder mixture obtained by the powder mixing step, and a kneading step of adding the water to a thickener added mixture obtained by the thickener mixing step, to perform kneading.

公开(公告)号：US20210299646A1

公开(公告)日：2021-09-30

申请号：US17177377

申请日：2021-02-17

Applicant: NGK INSULATORS, LTD.

Inventor： Shuji UEDA ,  Shungo NAGAI ,  Hiroaki HAYASHI

IPC: B01J35/04 ,  B01J37/00 ,  C04B38/00 ,  B01D53/88 ,  B01D39/20 ,  B01D46/24

Abstract: A pillar-shaped honeycomb structure including an outer peripheral side wall, a plurality of first cells provided on an inner peripheral side of the outer peripheral side wall, the first cells extending from a first end surface to a second end surface, each opening on the first end surface and having a sealing portion with an average void ratio of 4% or less on the second end surface, and a plurality of second cells provided on the inner peripheral side of the outer peripheral side wall, the second cells extending from the first end surface to the second end surface, each having a sealing portion with an average void ratio of 4% or less on the first end surface and opening on the second end surface, the first cells and the second cells being alternately arranged adjacent to each other with a partition wall interposed therebetween.

公开(公告)号：US20210268688A1

公开(公告)日：2021-09-02

申请号：US17147779

申请日：2021-01-13

Applicant: NGK Insulators, Ltd.

Inventor： Koichi SENDO ,  Yu TORII ,  Shuji UEDA ,  Shungo NAGAI

IPC: B28B3/20 ,  B28B11/24 ,  B01D46/00 ,  B01D46/24 ,  B01D39/20 ,  F01N3/022

Abstract: A manufacturing method of a honeycomb filter includes a kneaded material preparation process, a forming process, and a firing process, wherein the cordierite forming raw material contains porous silica as an inorganic pore former, in a cumulative particle size distribution of the cordierite forming raw material, particle diameters (μm) of 10% by volume, 50% by volume, and 90% by volume of the total volume from a small diameter side, are denoted by D(a) 10, D(a) 50 and D(a) 90, respectively, and a particle diameter (μm) of 50% by volume of the total volume from the small diameter side is denoted by D(b) 50 in a cumulative particle size distribution of the organic pore former, and the cordierite forming raw material and the organic pore former satisfy given expressions.