Tanaka Kikinzoku Kogyo K.k.

Tohoku Techno Arch Co., Ltd.

Tohoku University

Tokushima University

Denso Corporation

Kunihiro Tanaka

Koichi Sakairi

Kiyohito Ishida

Toshihiro Omori

Yutaka Sato

Muneki Nakamura

Tatsuya Nakazawa

Tetsuo Endoh

Shoji Ikeda

Kojiro Shiraishi

Akira Yoshikawa

Nobuo Abe

Kunihiro Shima

Yuya Kato

Yuki Murayama

Kenji Goto

Takao Asada

Yuui Yokota

Shuichi Kubota

Michimasa Okubo

Kenichi Hamada

Eiichi Honda

Hiroshi Matsuo

Fumie Seki

Akihito Fujino

Emi Takegawa

Kenichi Kurihara

The present invention relates to a platinum-based sputtering target containing platinum or a platinum alloy. The platinum-based sputtering target of the present invention is characterized by a material structure in a thickness-direction cross section thereof. Specifically, when a thickness-direction cross section is equally divided into n sections (n=5 to 20) along a thickness direction, a region including (n−2) sections excluding both end sections is set as a determination region, and when an average grain size in each of the sections is measured in the determination region, as well as an average grain size in the entire determination region is measured, the average grain size in the entire determination region is 150 μm or less, and a coefficient of variation calculated based on the average grain size in each of the sections of the determination region is 15% or less.

Platinum-based sputtering target, and method for producing the same

The present invention relates to a medical Au&#x2014;Pt&#x2014;Pd alloy including Au, Pt, Pd, and inevitable impurities. The alloy has an alloy composition inside a polygon (A1-A2-A3-A4-A5-A6) surrounded by straight lines connected at point A1 (Au: 37.9 atom %, Pt: 0.1 atom %, and Pd: 62 atom %), point A2 (Au: 79.9 atom %, Pt: 0.1 atom %, and Pd: 20 atom %), point A3 (Au: 79.9 atom %, Pt: 20 atom %, and Pd: 0.1 atom %), point A4 (Au: 69.9 atom %, Pt: 30 atom %, and Pd: 0.1 atom %), point A5 (Au: 49 atom %, Pt: 30 atom %, and Pd: 21 atom %), and point A6 (Au: 39 atom %, Pt: 40 atom %, and Pd: 21 atom %) in a Au&#x2014;Pt&#x2014;Pd ternary state diagram. The metal structure of the alloy is optimized, and the metal structure is close to a single-phase structure, and has little precipitation of a Au-rich phase and a Pt-rich phase different in composition from a mother phase.

Medical Au-Pt-Pd 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 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

Probe pins related to the present invention are formed from a material which consists essentially of one or more elements selected from the group consisting of platinum, iridium, ruthenium, osmium, palladium and rhodium. A material obtained by adding one or more elements selected from the group consisting of tungsten, nickel and cobalt to this metal may also be used.

Material for probe pins

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.

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Hiratsuka, Japan

Kunihiro Tanaka