Tanaka Kikinzoku Kogyo K.k.

Tohoku Techno Arch Co., Ltd.

Stonehart Associates Inc.

Masahiro Watanabe

Other

Denso Corporation

Koichi Sakairi

Kunihiro Tanaka

Kiyohito Ishida

Toshihiro Omori

Yutaka Sato

Takuya Hosoi

Tatsuya Nakazawa

Akira Yoshikawa

Nobuo Abe

Yuki Murayama

Nobuhisa Okamoto

Muneki Nakamura

Yuui Yokota

Yumi Yamamoto

Hiroshi Matsuo

Fumie Seki

Kenichi Kurihara

The present invention relates to a Ni-based heat-resistant alloy including Ir: 5.0 mass % or more and 50.0 mass % or less, Al: 1.0 mass % or more and 8.0 mass % or less, W: 5.0 mass % or more and 25.0 mass % or less, and balance Ni, having an L1-structured &#x3b3;' phase present in the matrix, and including at least one of Zr: 0.01 mass % or more and 3.0 mass % or less and Hf: 0.01 mass % or more and 3.0 mass % or less. This Ni-based heat-resistant alloy has improved toughness over a conventional Ni-based heat-resistant alloy based on a Ni&#x2014;Ir&#x2014;Al&#x2014;W-based alloy, and is also excellent in ambient-temperature strength.

Ni-based heat-resistant alloy

The present invention relates to a Ni-based heat-resistant alloy including Ir: 5.0 mass % or more and 50.0 mass % or less, Al: 1.0 mass % or more and 8.0 mass % or less, W: 5.0 mass % or more and 25.0 mass % or less, and balance Ni, having an L1-structured &#x3b3;' phase present in the matrix, and including at least one of Ru: 0.8 mass % or more and 5.0 mass % or less and Re: 0.8 mass % or more and 5.0 mass % or less. This Ni-based heat-resistant alloy has improved toughness over a conventional Ni-based heat-resistant alloy based on a Ni&#x2014;Ir&#x2014;Al&#x2014;W-based alloy, and is also excellent in ambient-temperature strength.

The present invention provides a metal wire rod composed of iridium or an iridium alloy, wherein the number of crystal grains on any cross-section in a longitudinal direction is 2 to 20 per 0.25 mm, and the Vickers hardness at any part is 200 Hv or more and less than 400 Hv. The iridium wire rod is a material which is produced by a &#x3bc;-PD method, and has low residual stress and which has a small change in the number of crystal grains and hardness even when heated to a temperature equal to or higher than a recrystallization temperature (1200&#xb0; C. to 1500&#xb0; C.). The metal wire rod of the present invention is excellent in oxidative consumption resistance under a high-temperature atmosphere, and mechanical properties.

Metal wire rod composed of iridium or iridium alloy

The present invention relates to a NiIr-base heat-resistant alloy which includes a Ni&#x2014;Ir&#x2014;Al&#x2014;W-base alloy which contains Ir: 5.0 to 50.0 mass %, Al: 1.0 to 8.0 mass %, W: 5.0 to 20.0 mass %, and the balance is Ni, and a &#x3b3;' phase having an L1structure precipitating and dispersing in a matrix as an essential strengthening phase, and a ratio (Y/X) of a peak intensity (Y) of (201) plane of the IrW phase observed in the range of 2&#x3b8;=48&#xb0; to 50&#xb0; to a peak intensity (X) of (111) plane of the &#x3b3;&#x2032; phase observed in the range of 2&#x3b8;=43&#xb0; to 45&#xb0; in X-ray diffraction analysis is 0.5 or less. The alloy exhibits good high-temperature property stably.

Ni-Ir-based heat-resistant alloy and process for producing same

The present invention is a heat-resistant Ni-base alloy including a Ni&#x2014;Ir&#x2014;Al&#x2014;W alloy having essential additive elements of Ir, Al, and W added to Ni, wherein the heat-resistant Ni-base alloy includes Ir: 5.0 to 50.0 mass %, Al: 1.0 to 8.0 mass %, and W: 5.0 to 20.0 mass %, the balance being Ni, and a &#x3b3;' phase having an L1structure disperses in a matrix as an essential strengthening phase. The heat-resistant material including the Ni-base alloy may contain one or more additive elements selected from B: 0.001 to 0.1 mass %, Co: 5.0 to 20.0 mass %, Cr: 1.0 to 25.0 mass %, Ta: 1.0 to 10.0 mass %, Nb: 1.0 to 5.0 mass %, Ti: 1.0 to 5.0 mass %, V: 1.0 to 5.0 mass %, and Mo: 1.0 to 5.0 mass %, or 0.001 to 0.5 mass % of C.

Heat-resistant Ni-base alloy and method of producing the same

The present invention is a metallic wire rod comprising iridium or an iridium-containing alloy and, the wire rod has in the cross section thereof biaxial crystal orientation of 50% or more of abundance proportion of textures in which crystallographic orientation has preferred orientation to &#x3c;100&#x3e; direction. In the present invention, crystal orientation in the outer periphery from semicircle of the cross section which is the periphery of the wire rod is important, and in this zone, abundance proportion of textures in which crystallographic orientation has preferred orientation to &#x3c;100&#x3e; direction is preferably not less than 50%.

Metallic wire rod comprising iridium-containing alloy

The present invention relates to a tape material for manufacturing an ignition plug electrode, the tape material being a member for forming an electrode chip, in which a base metal layer and a precious metal layer are cladded, on a bonded region set on an electrode base material of an ignition plug, the member is in the form of a long tape in which the base metal layer being in contact with the bonded region is cladded with the precious metal layer being in contact with the base metal layer, the base metal layer has a width substantially equal to one of the longitudinal width, lateral width and diameter of the bonded region. According to the present invention, bonding between a precious metal chip and a substrate can be reliably maintained to prolong the life of an ignition plug. Accordingly, precious metals can be efficiently used to save resources.

Tape material having clad structure for manufacturing ignition plug electrode

The present invention relates to a gas sensor electrode including a conductive particle phase made of Pt or Pt alloy and a ceramic particle phase being mixed and dispersed, wherein a rate of content of the ceramic particle phase is 6.0 to 22.0 mass %, and a void ratio is 2.5 to 10.0%, and a dispersion degree of the conductive particle phase per length of 25 &#x3bc;m on the electrode surface is 0.60 to 0.85 &#x3bc;m, and a dispersion degree of the conductive particle phase in the electrode cross section per length of 100 &#x3bc;m in a direction parallel to the electrode surface is 2.0 to 4.0 &#x3bc;m. This electrode can be produced by firing a metal paste made by dispersing, in a solvent, a conductive particle having a core/shell structure in which a core particle such as Pt is covered with a ceramic shell and ceramic powder. The gas sensor electrode according to the present invention has a high electrode activity.

Sensor electrode, manufacturing method thereof, and metal paste for electrode formation

An object of the present invention is to provide a conductive fine particle for producing a metal paste that can produce an electrode film having a low resistance, and a metal paste utilizing the conductive fine particle. The present invention is a conductive particle for electrode formation having a core/shell structure, and the conductive particle comprises a core particle made of Pt or a Pt alloy and having a particle diameter of 10 to 200 nm, and a shell made of a ceramic containing AlOor ZrOand covers at least a part of the core particle, wherein the ceramic constituting the shell is added in an amount of 0.5 to 15% by weight based on the core particle to cover the core. The core particle is preferably Pt or a Pt alloy alloyed with Pd, Au, Ag, or Rh.

Conductive fine particle and metal paste for electrode formation and electrode

The present invention is an electroconductive particle for forming an electrode including a precious metal particle including Pt or a Pt alloy and having an average particle diameter of 50 to 150 nm, a first ceramic particle including AlOor ZrOdispersed in the precious metal particle and having an average particle diameter of 5 to 50 nm, and a second ceramic particle including AlOor ZrObonded to an outer periphery of the precious metal particle and having an average particle diameter of 5 to 50 nm. The sum of the volume of the first ceramic particle and the volume of the second ceramic particle is preferably 2 to 40 vol % based on the whole electroconductive particle. A metal paste containing the electroconductive particle according to the invention is one from which an electrode film of low resistance and excellent durability can be manufactured and further excellent in adherence and conformability to a substrate.

Electroconductive particle and metal paste, and electrode

Conductive fine particle and metal paste for electrode formation, and electrode

An object of the present invention is to provide a material for a precious metal tip of a spark plug, which has more excellent durability, particularly oxidation wear resistance than a conventional one. The precious metal alloy for the spark plug according to the present invention contains 0.2 to 6.0 wt. % Cr as an essential component, further at least any one of Fe or Ni, and the balance being Ir. Here, the amount of Fe and Ni to be added is preferably 2.0 to 12.0 wt. % in total. According to the present invention, the surface may be oxidized to form an oxide layer made from a Cr&#x2014;Fe oxide, a Cr&#x2014;Ni oxide or a Cr&#x2014;Fe&#x2014;Ni oxide. The oxide layer is formed by a diffusion treatment by heating the precious metal alloy at 300 to 900&#xb0; C. in an oxidative atmosphere, and preferably has a thickness of 5 to 100 &#x3bc;m.

Noble metal alloy for spark plug and method for producing and processing the same

Disclosed an electrode for a polymer electrolyte electrochemical cell which comprises catalyst supports carrying catalyst particles, a first solid polymer electrolyte layer insoluble in water and an organic solvent formed on the particles and a second solid polymer electrolyte layer insoluble or soluble in the organic solvent formed on part of the surface of the first solid polymer electrolyte layer and a process of preparing same.

Electrode for polymer electrolyte electrochemical cell and process of

Disclosed is an electrode structure for fuel cell having a carbon support of which an apparent density is between 0.05 g/cm.sup.3 and 1.2 g/cm.sup.3. In this electrode structure, the sufficient diffusion of gases can be secured because the sufficient cavities are securely formed in the catalyst electrode layer by the carbon support having a smaller apparent density or a larger porosity even if the thickness of the catalyst electrode layer increases.

Electrode structure for fuel cell

Disclosed herein is a process of preparing a solid polymer electrolyte type fuel cell formed by combining a cathode current collector, a cathode containing cathode particles, an ion exchange membrane, an anode containing anode particles and an anode current collector characterized by comprising reducing a catalyst metal salt in an organic solution with the solid polymer electrolyte, depositing the reduced catalyst metal in the solid polymer electrolyte to form the cathode and/or the anode, interposing the cathode and/or the anode between the respective current collectors and the ion exchange membrane and pressing for assembling the fuel cell. Also disclosed is the same process as above except that the support is present in the solid polymer electrolyte. In the fuel cells prepared in accordance with the present invention, the catalyst metal always exists in the solid polymer electrolyte, and even if a cavity is formed in the solid polymer electrolyte, the catalyst metal is not exposed to the cavity. Accordingly, almost all the catalyst metals can be utilized to generate energy at the high efficiency.

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Hiratsuka, Japan

Koichi Sakairi