Manufacturing method of silicon carbide-based honeycomb structure

Patent metadata

Field	Value
Publication number	US-11034624-B2
Application number	US-201815906153-A
Country	US
Kind code	B2
Filing date	Feb 27, 2018
Priority date	Mar 17, 2017
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A manufacturing method of a silicon carbide-based honeycomb structure, including a firing step of introducing extruded honeycomb formed bodies containing a silicon carbide-based component, together with firing members into a firing furnace, and firing the honeycomb formed bodies, to manufacture the silicon carbide-based honeycomb structure,wherein the firing members are formed by using a ceramic material containing 70 wt % or more of alumina, andthe firing step further includes:an inert gas supplying step of supplying an inert gas to a furnace space of the firing furnace, anda gas adding step of adding a reducing gas to the furnace space.

First claim

What is claimed is:

1. A manufacturing method of a silicon carbide-based honeycomb structure, comprising a firing step of introducing extruded honeycomb formed bodies containing a silicon carbide-based component, together with firing members into a firing furnace, and firing the honeycomb formed bodies, to manufacture the silicon carbide-based honeycomb structure,
wherein the firing members are formed by using a ceramic material containing 70 wt % or more of alumina, and
the firing step further comprises:
an inert gas supplying step of supplying an inert gas to a furnace space of the firing furnace, and
a gas adding step of adding a reducing gas to the furnace space;
wherein the gas adding step, the reducing gas is added to the furnace space under the inert gas atmosphere so that a concentration of the reducing gas is from 1 ppm to 5000 ppm.

2. The manufacturing method of the silicon carbide-based honeycomb structure according to claim 1 , further comprising:
a gas premixing step of mixing the inert gas and the reducing gas to generate a mixed gas,
wherein in the inert gas supplying step and the gas adding step, the mixed gas is supplied or added.

3. The manufacturing method of the silicon carbide-based honeycomb structure according to claim 1 ,
wherein the gas adding step is performed after the furnace space is adjusted under an inert gas atmosphere by the inert gas supplying step.

4. The manufacturing method of the silicon carbide-based honeycomb structure according to claim 1 ,
wherein as the reducing gas, at least one of a hydrocarbon gas, hydrogen gas and carbon monoxide gas is utilized.

5. The manufacturing method of the silicon carbide-based honeycomb structure according to claim 1 ,
wherein the firing members include shelf plates on which the honeycomb formed bodies are to be mounted, and frame bodies which surround the honeycomb formed bodies mounted on the shelf plates and on and under which the honeycomb formed bodies are mounted.

6. The manufacturing method of the silicon carbide-based honeycomb structure according to claim 1 ,
wherein the inert gas is an argon gas.

7. The manufacturing method of the silicon carbide-based honeycomb structure according to claim 1 , wherein the silicon carbide-based honeycomb structure is disposed on the firing member formed of a ceramic material containing 70 wt % or more of alumina.

Assignees

• Ngk Insulators Ltd

Inventors

• Ihara Chikashi
• Yoshida Shinya
• Shimada Masato
• Kamei Yoshiyuki

Classifications

• C04B2235/9623

  Ceramic setters properties · CPC title

• B28B11/243

  Setting, e.g. drying, dehydrating or firing ceramic articles (B28B11/242 takes precedence) · CPC title

• C04B2235/664

  Reductive annealing · CPC title

• C04B2235/661

  Multi-step sintering · CPC title

• C04B2235/658

  Atmosphere during thermal treatment · CPC title