Nippon Steel Sumitomo Metal Corporation

Sumitomo Metal Industries, Inc.

Nippon Steel Corporation

Osaka Titanium Technologies Co., Ltd.

Yasuhiro Masaki

Manabu Kanzaki

Osamu Miyahara

Akihiro Uehira

Yasuyoshi Hidaka

Yoshitaka Nishiyama

Junko Imamura

Shoji Kinomura

Katsuhiro Nishihara

Yumi Momozono

Jun Maki

Masanari Kimoto

Takahiro Osuki

Hideya Kaminaka

Haruhiko Kajimura

Mitsuharu Yonemura

Kiyoko Takeda

Masahito Tasaka

Tadashi Ogasawara

Munetoshi Watanabe

Kazuyuki Kitamura

Shunsuke Taniguchi

Tadashi Fukuda

Rie Katsui

Katsumi Okada

Michiyasu Takahashi

Tadashi Yao

Shiji Shimosaki

Kouji Oda

Sadanobu Nagaoka

A titanium product for a separator of a proton exchange membrane fuel cell according to the present invention includes: a base material that consists of commercially pure titanium; a first oxide layer that is formed in a surface layer of the titanium product, consists of TiOof a rutile crystallinity, and has a thickness of 0.1 to 1.5 nm; and a second oxide layer that is formed between the base material and the first oxide layer, consists of TiO(1&#x3c;x&#x3c;2), and has a thickness of 3 to 20 nm. This titanium product is suitable to be used as a separator of a proton exchange membrane fuel cell that has a high corrosion resistance in an environment in a fuel cell, is capable of keeping a low contact resistance with an electrode consisting of carbon fiber and the like, and is inexpensive.

Titanium product, separator, and proton exchange membrane fuel cell, and method for producing titanium product

Provided is a metallic material including: a base metal made of a metal; a metal compound layer stacked on a surface of the base metal, the metal compound layer mainly containing a compound of at least one transition metal in the fourth period and oxygen; a platinum group portion dispersed on a surface of the metal compound layer, the platinum group portion mainly containing at least one platinum group element; and a platinum group compound coating film which covers the platinum group portion, the platinum group compound coating film mainly containing a compound of at least one platinum group element and oxygen. The at least one platinum group element contained in the platinum group portion is preferably one or more of Ru, Rh, Os, and Ir.

Metallic material, and conductive component including the same

A Ni-based alloy tube includes a base metal having a chemical composition consisting, by mass percent, of C: 0.15% or less, Si: 1.0% or less, Mn: 2.0% or less, P: 0.030% or less, S: 0.030% or less, Cr: 10.0 to 40.0%, Ni: 50.0 to 80.0%, Ti: 0.50% or less, Cu: 0.60% or less, Al: 0.20% or less, N: 0.20% or less, and the balance: Fe and impurities; and a low Cr content complex oxide film having a thickness of 25 nm or smaller at least on an inner surface of the base metal, wherein contents of Al, Ni, Si, Ti, and Cr in the film satisfy [at % Al/at % Cr&#x2264;2.00], [at % Ni/at % Cr&#x2264;1.40], and [(at % Si+at % Ti)/at % Cr&#x2265;0.10].

Ni-based alloy tube

An austenitic alloy tube subjected to a cold working and an annealing heat treatment contains C: 0.01% to 0.15%, Cr: 10.0% to 40.0%, Ni: 8.0% to 80.0%, in mass %, and has a metallographic structure satisfying the following Expressions (i) to (iii).1&#x2003;&#x2003;(i)&#x2003;&#x2003;(ii)1=0.28&#xd7;(/(0.35))&#x2003;&#x2003;(iii)

Austenitic alloy tube

There is provided a Cr-containing austenitic alloy having a chromium oxide film with a thickness of 5 nm or larger on the surface, wherein the content of Mn in a base metal is, by mass percent, less than 0.1%. The chemical composition of the base metal desirably consists of, by mass percent, C: 0.15% or less, Si: 1.00% or less, Mn: less than 0.1%, P: 0.030% or less, S: 0.030% or less, Cr: 10.0 to 40.0%, Ni: 8.0 to 80.0%, Ti: 0.5% or less, Cu: 0.6% or less, Al: 0.5% or less, and N: 0.20% or less, the balance being Fe and impurities.

Cr-containing austenitic alloy and method for producing the same

There is provided a chromium-containing austenitic alloy wherein at least one surface of the surfaces of the alloy has a continuous chromium oxide film with a thickness of 5 nm or more and less than 50 nm. A maximum current density determined by a critical passivation current density method is 0.1 &#x3bc;A/cmor less when the chromium oxide film is continuous. A chemical composition of a base metal preferably consists of, by mass percent, C: 0.15% or less, Si: 1.00% or less, Mn: 2.0% or less, P: 0.030% or less, S: 0.030% or less, Cr: 10.0 to 40.0%, Ni: 8.0 to 80.0%, Ti: 0.5% or less, Cu: 0.6% or less, Al: 0.5% or less, and N: 0.20% or less, the balance being Fe and impurities.

Chromium-containing austenitic alloy

There is provided a Cr-containing austenitic alloy tube, wherein a chromium oxide film with a thickness of 0.05 to 1.5 &#x3bc;m having the relationship defined by Formula (i) is formed on the inner surface of the tube, wherein the average concentration of C in the depth range of 5 to 10 &#x3bc;m from the inner surface is lower than the concentration of C in a base metal;0.4&#x2266;&#x3b4;1/&#x3b4;2&#x2266;2.5&#x2003;&#x2003;(i)wherein &#x3b4;1 and &#x3b4;2 are thicknesses (&#x3bc;m) of the chromium oxide film at both ends of tube, respectively.

Cr-containing austenitic alloy tube and method for producing the same

A titanium oxide-based photocatalyst which can exhibit excellent photocatalytic properties in response to visible light while maintaining its inherent activity in response to ultraviolet light and which is suitable for mass production contains bismuth as a first additional metal component and at least one metal element selected from silicon, zirconium, aluminum, and hafnium as a second additional metal component in titanium oxide. The Bi/Ti atomic ratio is preferably at least 0.0001 and at most 1.0, the atomic ratio of the second additional metal to Ti is preferably at least 0.0001 and at most 0.8, and a portion of bismuth is preferably present in the form of lower valence (Bior Bi). The presence of lower valence bismuth can be ascertained by XPS analysis.

Titanium oxide photocatalyst, method for producing same and use thereof

Titanium oxide-based photocatalysts which contain a metal halide in titanium oxide and which are prepared from titanium oxide and/or its precursor, which may optionally be heat treated, by contact with a reactive gas containing a metal halide of the formula MXor MOX(wherein M=a metal, X=a halogen, and n=an integer) with heating stably develop a high photocatalytic activity with visible light irradiation. The photocatalysts may subsequently be stabilized by contact with water or by heat treatment, and/or promoted by contact with a heteropoly acid and/or an isopoly acid so as to include a metal complex in the titanium oxide. Photocatalysts prepared in this manner exhibit novel ESR features. The present invention also provides methods for preparing these photocatalysts, a photocatalyst dispersion and a photocatalytic coating fluid containing such a photocatalyst, and photocatalytic functional products and methods for their manufacture using the photocatalyst.

Titanium oxide photocatalyst, process for producing the same and application

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Tokyo, Japan

Yasuhiro Masaki