Ngk Insulators, Inc.

Haremi Ito

Keiji Matsumoto

Susumu Matsuoka

Seiichi Inoue

Kenichi Tanaka

Kazuo Suzuki

Hideya Maekawa

Shinji Murahata

Masahiro Ihara

A die for extrusion-forming a honeycomb structure which includes: a die base provided with ceramic puddle introducing holes and slits in communication with the ceramic puddle introducing holes; and a substrate layer, which roughly defines the final width of the slits, and a surface layer, which precisely defines the final width of the slits, formed on the die base in this order so that the final width of the slits becomes 15 to 200 &#x3bc;m, wherein the surface layer is made up of tungsten carbide particles which are 5 &#x3bc;m or less in average particle diameter and contain WC as a main ingredient. According to this invention, there is provided a die for extrusion-forming a honeycomb structure which can restrain fluctuation in extrusion-forming speed among its parts and resistance to pushing force, both caused at the time of extrusion-forming, to be very small and is superior in productivity and durability.

Die for molding honeycomb structure and manufacturing method thereof

In a die for molding a honeycomb structure, in which a coating layer is formed on a die base so that slits with a particular width are provided, the slits are provided so as to have a width of 30 to 200 &#x3bc;m by forming the coating layer by a substrate layer with a thickness of 10 to 100 &#x3bc;m and a surface layer with a thickness of 1 to 30 &#x3bc;m. Further, the substrate layer is formed by a metal layer containing no oxide. A thin-wall honeycomb structure with a wall thickness of 30 to 200 &#x3bc;m can be formed, and moreover a die for molding a honeycomb structure, in which the coating layer is not damaged and thus the durability is high, and a manufacturing method thereof can be provided.

An extrusion die an be produced and reclaimed precisely, quickly and easily in an economical way, possesses a high abrasive-resistant property and a prolonged life, produces light-weight honeycomb structures having thin partition walls and provides a large reaction surface area within the honeycomb structure for the catalyst to contact with the exhaust gases, in addition to smooth passage of the exhaust gases with little pressure loss thereof, and mitigates or eliminates the drawbacks of conventional dies.

Extrusion die, method of producing the same and method of reclaiming the

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Tokoname, Japan

Haremi Ito