Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Other

Denso Corpora Tion

Yoshiharu Miyake

Tetsuya Suganuma

Hiroki Nishijima

Shinji Tsuji

Yoshihisa Serizawa

Haruki Kondo

Naoto Miyoshi

Tomomi Hase

Toshihiro Takada

Masayuki Tamura

Hirofumi Suzuki

Makoto Nakae

Tatsuji Mizuno

Atsushi Murai

Yoshihide Segawa

Yukio Okochi

Yusuke Itoh

Kei Sugiura

Toru Takeuchi

Yasushi Hirata

Hajime Kamio

Takayuki Tsuchida

Hiroshi Nagashima

Tooru Takeuchi

The present disclosure provides a gas sensor element comprising a porous protective layer with improved water repellency upon continuously water pouring, which is a gas sensor element comprising:

Gas sensor element

A gas sensor element having a porous protective layer with excellent water repellency. Provided is a gas sensor element having a detection portion, which has a stack of a solid electrolyte body having a pair of electrodes on opposite sides thereof and a heat generating body including a heat generating source, and a porous protective layer formed around the detection portion. The porous protective layer has thermal conductivity &#x3bb; in the range of 0.2 to 5 W/mK, and has &#x3bb;Cp&#x3c1;, which is the product of the thermal conductivity &#x3bb;(W/mK), density &#x3c1;(g/m), and specific heat Cp(J/gK), in the range of 5.3&#xd7;10to 2.1&#xd7;10WJ/mK.

A ceramic catalyst body has a ceramic carrier supporting catalyst therein. The ceramic carrier has plural cells surrounded by plural cell walls arranged in a honeycomb shape, and a catalyst separation ratio H of the ceramic carrier expressed by the following formula is not more than 35%. H=217.254+(&#x2212;0.167)&#xd7;T+0.345&#xd7;D+28.731&#xd7;&#x394;CTE&#x2212;3.343&#xd7;S, where &#x394; CTE(&#xd7;10/&#xb0; C.) is a difference between a thermal expansion coefficient Cof the ceramic catalyst body and a thermal expansion coefficient Cof the ceramic carrier, T(K) is an internal temperature of the ceramic carrier, D(cc/g) is a amount of fine pores of not more than 2 &#x3bc;m in the ceramic carrier, and S(%) is a surface porosity indicating the ratio of an area of opening parts of the fine pores on a surface of the ceramic carrier.

Ceramic catalyst body

A honeycomb-shaped substrate for catalyst is made from ceramic, has a straight-flow structure, and includes cellular walls exhibiting pore volumes, which differ partially, and a large number of cellular passages demarcated by the cellular walls. A catalyst for purifying exhaust gases is produced by providing the cellular walls of the honeycomb-shaped substrate with a catalytic coating layer.

Honeycomb-shaped straight-flow structure for catalyst and catalyst for purifying exhaust gases

A catalyst for purifying an exhaust gas includes a composite oxide including gold (Au) and having crystalline unit cells in every one of which an Au ion is disposed. Since the Au exists in a state of an ion, the catalyst exhibits a good catalytic activity. Since the Au is present in such a manner that it is surrounded by the other elements, it is inhibited from moving. As a result, the catalyst is improved in terms of the heat resistance.

Catalyst for purifying an exhaust gas

A high-strength aluminum alloy having good porthole extrudability is provided. It has a Vickers hardness Hv of not less than 40 as measured in a homogenized state created by heat treatment before extrusion and a Vickers hardness Hv of not less than 20 imparted by plastic working after the heat treatment.

Process for improving the extrudability of high-strength aluminum alloys

The present invention relates to an alloy catalyst for purifying an exhaust gas, and particularly provides an alloy catalyst excellent in nitrogen oxide purification characteristics in the lean region by improving the catalytic activity by coating first catalytic metal particles with a second metal coagulated phase, and a process for producing the same, the alloy catalyst for purifying an exhaust gas having a structure in which metal coagulated phases being applied to and supported by a metal oxide, and comprising first catalytic metal particles having an average particle size of up to 30 nm, and a second metal coagulated phase containing at least one metal, differing from the catalytic metal particles, and applying to the first catalytic metal particles at a coating ratio of at least 45%, and the process for producing an alloy catalyst for purifying an exhaust gas, comprising the steps of allowing first catalytic metal particles having an average particle size of up to 30 nm to adhere onto a metal oxide, and reduction precipitating a second metal coagulated phase containing at least one metal differing from the first catalytic metal particles thereon, and comprising at least one metal selected from the group consisting of Pt, Pd, Au, Rh, Ag and Ir.

Alloy catalyst and process for producing the same

The present invention relates to a process for producing a superplastic aluminum alloy capable of being used for plastic working such as extrusion, forging and rolling. An object of the present invention is to provide an ingot-made high speed superplastic aluminum alloy in which superplasticity is developed at a strain rate higher than that of conventional static recrystallization type superplastic aluminum alloys, and a process for producing the same. The superplastic aluminum alloy of the invention has structure which is obtained by adding to a basic alloy containing from at least 4.0 to 15% by weight of Mg and from 0.1 to 1.0% by weight of one or more elements selected from the group consisting of Mm, Zr, V, W, Ti, Ni, Nb, Ca, Co, Mo and Ta, and further selective elements of Sc, Cu. Li, Sn, In and Cd, which contains from 0.1 to 4.0% by volume fraction of spheroidal precipitates of intermetallic compounds having a particle size from 10 to 200 nm, and which has a mean grain size from 0.1 to 10 .mu.m.

Superplastic aluminum alloy and process for producing same

To provide a hot working method which can reduce working resistance during the early stage of hot plastic working, particularly extrusion and forging using a die. A hot plastic working method characterized by comprising the step of plastically working, using a die, a material having a structure of not more than 50 .mu.m in average grain diameter with dispersed spherical grains ranging in size from 10 to 200 nm, the working material having a recess formed on a surface thereof in its site facing a closed space formed by abutting the working material against the die surface at the time of plastic working.

Hot plastic working method

The present invention relates to a process for producing a superplastic aluminum alloy capable of being used for plastic working such as extrusion, forging and rolling. An object of the present invention is to provide an ingot-made high speed superplastic aluminum alloy in which superplasticity is developed at a strain rate higher than that of conventional static recrystallization type superplastic aluminum alloys, and a process for producing the same. The superplastic aluminum alloy of the invention has structure which is obtained by adding to a basic alloy containing from at least 4.0 to 15% by weight of Mg and from 0.1 to 1.0% by weight of one or more elements selected from the group consisting of Mm, Zr, V, W, Ti, Ni, Nb, Ca, Co, Mo and Ta, and further selective elements of Sc, Cu, Li, Sn, In and Cd, which contains from 0.1 to 4.0% by volume fraction of spheroidal precipitates of intermetallic compounds having a particle size from 10 to 200 nm, and which has a mean grain size from 0.1 to 10 .mu.m.

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Miyoshi, Japan

Yoshiharu Miyake