Nippon Steel Corporation

Toyota Jidosha Kabushiki Kaisha

Nippon Kinzoku Co., Ltd.

Mikio Yamanaka

Keiichi Ohmura

Shinichi Matsumoto

Toshihiro Takada

Masayuki Kasuya

Yasushi Ishikawa

Toshiyuki Yashiro

Masuhiro Fukaya

Akihiko Kasahara

Yutaka Sadano

Yasuo Otoguro

Masayuki Tendo

Hidehiko Sumitomo

Satoshi Kado

Shinji Shibata

Kazutoshi Iwami

Masao Yashiro

Hikaru Aoyagi

Takashi Tanaka

Fumio Fudanoki

Hitoshi Ohta

Toshikazu Nakagawa

Takashi Zaizen

Kotaro Yoshida

Keiichi Omura

Taketomo Yamazaki

Yuichi Sato

Nobuhiro Fujita

Yuichi Kato

Masaki Izumi

Yasushi Nakamura

Shuji Nagasaki

Hiroyuki Tanaka

Tsutomu Ozawa

Tamio Noda

Tadayuki Otani

Shinzi Shibata

Yoshio Nishizawa

Mizuo Sakakibara

Wataru Murata

Shigetoshi Sugimoto

Masamitsu Tsuchinaga

Susumu Takemura

Yoshikuni Tokunaga

Katukuni Hashimoto

Harumi Tsuboi

Kouki Yotsuya

Toru Utsumi

Hitoshi Ota

Hisashi Baba

Takuo Kono

Takuzo Kako

Masao Onoyama

Katsuhiko Yabe

Shozo Yamane

Fujio Shimizu

Motohiko Arakawa

Hiroo Wakiyama

Shingo Tanioka

Yuichi Okazaki

Tetsuro Inomata

Jun Nakatuka

Jun Araki

Akira Imamura

Ryoichi Hisatomi

Atuhiko Imai

Tadanobu Komai

Tatuo Sugiura

Toshihiro Egami

Masaaki Ohashi

Tetsu Sakamoto

The present invention is: a metallic foil to be used for a metallic honeycomb for purifying exhaust gas of an automobile or the like, said metallic foil not causing cracks or ruptures to develop in the foil even when it undergoes corrugation work with more sharply bending corner portions of a trapezoidal shape; and a catalyst support for purifying exhaust gas of an automobile or the like, characterized in that said metallic foil, being rough surface finished and having good corrugation workability, is made of heat-resistant stainless steel and has surface roughness more than 2.0 and not more than 5.0 &mgr;m in R and, said metallic catalyst support for purifying exhaust gas has a structure comprising a honeycomb inserted in a jacket, wherein the honeycomb is composed of rough surface finished metallic foil having surface roughness more than 2.0 and not more than 5.0 &mgr;m in R and the jacket is made of heat-resistant stainless steel.

Rough surface finished metallic foil with good corrugation workability and catalyst support for exhaust gas purification

In order to improve solid phase diffusion bondability at contact portions between a metal flat foil and a metal corrugated foil together constituting a metal honeycomb body for a catalyst converter used for purifying an exhaust gas and to improve engine durability, the present invention comprises one or combination of the following structures; a structure wherein at least one of the metal foils has a foil thickness of less than 40 &mgr;m; a structure wherein an Al content after bonding is at least 3%; a structure wherein the surface condition of both metal foils in a width-wise direction has a predetermined surface coarseness or a predetermined surface shape and condition; and a structure wherein the width of contact portions between both metal foils is at least five times the thickness of the metal foils. In order to further improve engine durability, the present invention disposes an unbonded portion inside the honeycomb body having the construction described above, or disposes a shell on the outer periphery of the honeycomb body.

Metal honeycomb body for exhaust gas purification catalyst and method for producing the same

A metallic carrier for automobile exhaust gas purification made of thin metal foil includes a honeycomb unit composed of 8-25 &mgr;m thick corrugated metal foil and flat metal foil joined by solder joints not fewer than 70% of which have a thickness of at least 1.5 times and not greater than 4 times the foil thickness. A method of producing the metal carrier includes a step of forming a honeycomb unit in which 8-25 &mgr;m thick corrugated metal foil and flat metal foil are joined by solder joints using a solder powder, the solder powder having a particle diameter not greater than 4.5 times the thickness of the metal foil constituting the honeycomb unit.

Metallic carrier, for automobile exhaust gas purification, made of thin metal foil and method of producing the same

Metallic honeycomb body for supporting catalyst and production method

Highly heat-resistant metallic carrier for an automobile catalyst

High-strength stainless steel foil for corrugating and process for

Fe-Cr-Al alloy steel sheet and process for producing the same

A metallic carrier composed of an end face portion formed in at least one of the axial end portions of a honeycomb body and an outer circumferential reinforcing layer in which foils in a range from the outermost layer to a quarter of the total number of layers are joined together in the axial intermediate portion. Thus, the metallic carrier is flexible in expansion and shrinkage. Further, the honeycomb body and a jacket are joined to each other mainly at the outer circumference of the outer circumferential reinforcing layer of the honeycomb body, to reduce thermal stress developed between the honeycomb body and jacket while maintaining the strength against a high temperature, to thereby prevent the metallic carrier from being ruptured.

Heat and fatigue resistant metallic carrier for automobile exhaust

A semi-oval shaped metallic carrier having an excellent thermal stress resistance and thermal fatigue resistance and used for an automobile exhaust gas-purifying catalyst, in which the carrier is composed of a metallic honeycomb body constituted by superimposing flat metal foils and corrugated metal foils one on the other and winding them together, and a metallic jacket enclosing the lateral face of the honeycomb body, the transverse section of the metallic carrier constituting the parallel portions and semi-circular arc portions and the honeycomb body is joined to the jacket mainly at the semi-circular arc portions or at the parallel portions of the honeycomb body.

Semi-oval shaped carrier having excellent thermal stress resistance and

High Al austenitic heat-resistant steel superior in hot workability

A method of diametrically contracting a cylindrical body, includes the steps of grasping the cylindrical body with a plurality of elongated grasping members, preparing a cylindrical drawing die having an opening at one end and a tapered inside peripheral surface, drawing the grasping members together with the cylindrical body into the drawing die, through the opening, and applying a compression force to the cylindrical body through the grasping members due to the passage along through the tapered inside peripheral surface, to thereby cause the cylindrical body to be diametrically contracted. During the drawing process, since the cylindrical body does not come into direct contact with the drawing die, neither scratches nor baking cracks are produced on the outside surface of the cylindrical body.

Method for contracting a cylindrical body

An exhaust gas purifying catalyst of this invention comprises a heat resistance stainless steel catalyst support, an oxide film containing zirconium oxide formed on the heat resistance stainless steel catalyst support, an activated alumina catalyst carrier layer formed on the oxide film, and at least one metal catalyst loaded in the activated alumina catalyst carrier layer. Thus, the activated alumina catalyst carrier layer's come-off from the catalyst support and the oxidation of the catalyst support are suppressed at the same time, and the conversions of the hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx) are also improved.

Exhaust gas purifying catalyst

A rolled high Al stainless steel foil for use as a substrate for a catalyst carrier, which comprises more than 12 wt % up to 20 wt % of Al, from 5 to 25 wt % of Cr, from 0.05 to 2 wt %, in total, of at least one element selected from the group consisting of Ti, Nb, Zr, and Hf, and the remainder substantially consisting of Fe and unavoidable elements. The stainless steel foil has an excellent resistance to oxidation in an engine exhaust gas at a temperature of 1150.degree. C. or higher, can be obtained by foil-rolling, and enables a reduction of the exhaust back-pressure and weight of automobile catalyst converters.

Rolled high aluminum stainless steel foil for use as a substrate for a

A process for producing a metallic catalyst-carrier, comprising the steps of: preparing a steel sheet containing 9.0 to 25.0 wt % Cr and 0.01 to 6.0 wt % Al, plating the steel sheet with Ni at an amount of from 0.3 to 10.0 g/m.sup.2, then plating with Al or Al-alloy at a plated amount defined by the formula; ##EQU1## and with a provision that the thickness of an Al-Fe alloyed layer is controlled to a thickness of 10 .mu.m or less, cold rolling to a rolled thickness of 0.1 mm or less, working to a body of a required form, and heat-treating the body.

Processes for production of metallic catalyst-carrier and catalytic

An Al-containing stainless steel is rapidly solidified from a molten state to produce a ribbon. In catalyst carrier for the exhaust gas of automobile, the Al is utilized for the formation of .alpha.-Al.sub.2 O.sub.3 whiskers, which carry and rigidly bond the .gamma.-Al.sub.2 O.sub.3 powder to the ribbon, as the direct carriers of noble metals.

Stainless steel ribbon for use as a catalyst carrier for automobile

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Futtsu, Japan

Mikio Yamanaka