Ngk Insulators, Inc.

Daido Tokushuko Kabushiki Kaisha

Toyota Jidosha Kogyo Kabushiki Kaisha

Nippon Gaishi Kabushiki Kaisha

Noboru Yamamoto

Hiroaki Suzuki

Shigeo Soejima

Takao Shimizu

Masaaki Noguchi

Isao Oda

Tsuchio Bunda

Masayuki Kaneno

Shigeyuki Inagaki

Tadaaki Matsuhisa

Masaki Tsuchiya

Hirotsugu Horio

Akira Ohmura

Shigeo Hanajima

Kazuhiro Toyoda

Gas shielded arc welding method

In a method of bonding ferric and austenitic dual stainless steels, an insert material made of a Ni base alloy having a melting point below 1290.degree. C. is put between the bonding cross section faces of mother material steels comprising a dual phase stainless steel. A pressure force in the range of 3 MPa to 5 MPa is applied to a bonding area. The bonding area is heated at a temperature in the range of 1290.degree. C. to a melting point of the mother material steel. The temperature is kept for in the range of 30 second to 180 second.

Bonding method of dual phase stainless steel

In a metal material bonding method, an insertion material, which has a lower melting point than that of metal materials to be bonded, is interposed between bonding end surfaces of the metal materials to be bonded. The metal materials to be bonded is heated and held to a temperature not lower than the melting point of the insertion material and not higher than the melting point of the metal materials to be bonded while applying pressure to bonding surfaces of the metal materials to be bonded. The insertion material is formed to have a size which is smaller than each of the bonding surfaces of the metal materials to be bonded.

Metal material bonding method

A engine valve having composite structure including a valve stem and a valve head which are made from Ti--Al based alloy and a tail end formed with heat resisting steel are produced by joining a stem end member made from the heat resisting steel to an end of the valve stem made from the Ti--Al based alloy opposite to the valve head by, for example, brazing.

Method for producing an engine valve

An engine valve having composite structure comprising a valve stem and a valve head which are made from Ti--Al based alloy and a tail end formed with heat resisting steel are produced by joining a stem end member made from the heat resisting steel to an end of the valve stem made from the Ti--Al based alloy opposite to the valve head by, for example, brazing.

Engine valve and method for producing the same

Cordierite ceramic honeycomb consisting mainly of cordierite in crystal phase and containing not more than 20% by weight of at least one crystal selected from the group consisting of spinel, mullite and corundum and having a thermal expansion coefficient at a temperature range of 25.degree.-1,000.degree. C. being less than 22.times.10.sup.-7 (1/.degree.C.).

Cordierite ceramic honeycomb and a method for producing the same

A thermal converter is constructed with thermoelectric element composed of a honeycomb structural body having a large number of parallel channels extending therethrough and separated by thin walls, a part of the channels forming a region for flowing a high temperature fluid and the other part of the channels forming a region for flowing a low temperature fluid. A honeycomb structural body to constitute P type thermoelectric element and a honeycomb structural body to constitute N type thermoelectric element are preferably alternately arranged in a plurality of numbers.

Thermal converter

A ceramic honeycomb composite structure adapted to be used as a catalyst support comprises a ceramic honeycomb body and ceramic layers integrally provided thereon having surfaces including therein microscopic holes, a sum of volumes of the holes 5 microns or more being at least 0.1 cm.sup.3 /g to ensure a sufficient catalyst-supporting property and achieve a high mechanical strength of the structure. On the layers of the structure are provided active material layers onto which a catalytic component is applied to enable it to be used as a catalyst. A ceramic material is extruded through a die to form the ceramic honeycomb body to which is applied ceramic grains and then the body with the grains is dried and sintered to complete the composite structure.

Ceramic honeycomb composite structure, catalyst supported thereby and

A catalyst support characterized by having a total pore volume ranging 0.05-0.5 cc/g. an average pore diameter ranging from 0.05-5.mu. and consisting mainly of .alpha.-alumina; and an internal combustion engine exhaust gas purifying catalyst made of said catalyst support carrying a catalytic agent.

Catalyst for purifying exhaust gas from an internal combustion engine

A tubular discharge envelope and a high-pressure vapor discharge lamp using the same are disclosed. The envelope is composed of a polycrystalline transparent alumina having an average crystal grain size of 20-60 .mu.m and crystal grains of 20 .mu.m or less which occupy not more than 30% per unit area of the envelope.

Tubular discharge envelope composed of a polycrystalline transparent

A porous catalyst carrier refractory material with its pores containing internally deposited active alumina, its total pore volume being 0.05-0.50 cc/g, its average pore diameter 0.05-5.0.mu. and its specific surface area 3-60 m.sup.2 /g and a method of making it.

Catalyst carrier, catalyst and their manufacturing process

A polycrystalline alumina has at least 50% unit surface area provided by crystals of at least 60 .mu.m, and preferably 100 .mu.m size. This improves the in-line transmission value and hence lamp efficiency in a tube for a high pressure metal vapor lamp having an envelope of alumina.

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Nagoya, Japan

Noboru Yamamoto