Motonori Tamura

Effect of Chromium Oxide Film Formation, Mainly by the INCO Method, on Hydrogen Permeability on Welded Type 304 Stainless Steel

Kazuyoshi Kawami, Atsushi KINOSHITA, Hiroyasu Tamai, Toshiyuki Tanaka et autres

This study assessed surface treatment techniques applicable to welded joints of stainless steel pipes and vessels for a hydrogen-permeation barrier. Specifically investigated was electrolytic polishing using electrolyte compositions consisting of sulfuric acid, phosphoric acid, and methane-sulfonic acid to promote uniform passive film …

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Evaluation of the Hydrogen Barrier Properties of Chromium Oxide Films Deposited on SUS304 Austenitic Stainless Steels

Kazuyoshi Kawami, Atsushi Kinoshita, Hisashi Yamanaka, Yoji Fukuda et autres

Abstract Austenitic stainless steels including type SUS304 of the Japanese Industrial Standard (JIS), which is similar to ASME Type 304 SS, are candidate materials for the various facilities of high-pressure gaseous hydrogen, such as a hydrogen station containers and piping. To prevent …

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Wet Coated Thin Barrier Films to Prevent Hydrogen Embrittlement on SUS304 Stainless Steel

Kazuyoshi Kawami, Bai An, Takashi Iijima, Seiji Fukuyama et autres

Abstract Hydrogen barrier coating is a promising technology for preventing hydrogen embrittlement in metals. In this study, characterizations of hydrogen barrier films coated on surfaces of austenitic stainless steel, SUS304 of the Japanese Industrial Standard (JIS), by wet coating processes applied electro-polishing …

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Hydrogen Permeation of Multi-Layered-Coatings

Motonori Tamura

Using a substrate of AISI 316L austenitic stainless steel, which is used for components in high-pressure hydrogen systems, the hydrogen barrier properties of samples with single-layer coatings of TiC, TiN, and TiAlN as well as a multi-layered coating of TiAlN and TiMoN …

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TiAlN/TiMoN Coatings as Hydrogen Barriers

Motonori Tamura, Hidekazu TAKIZAWA

We evaluated the hydrogen barrier properties of a multi-layered coating of TiAlN/TiMoN.Coatings facilitated reductions of the hydrogen permeabilities to 1/1,000 of that of the uncoated substrate.The experiment confirmed that the coatings composed of fine crystal grains were highly effective as hydrogen barriers, …

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データサイエンスの人材育成モデル

Masakatsu KIYOSU, Motonori Tamura

By the accumulation of big data and improvement of the computer ability, the mathematics theory including machine learning or data mining became a practical use stage. With it, the specialist in data science is highly demanded in the field of various sciences …

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Effect of Hydrogen Content and Structure in Diamond-like Carbon Coatings on Hydrogen Permeation Properties

Motonori Tamura

Hydrogen permeability of diamondlike amorphous carbons

Motonori Tamura, Tai Kumagai

The hydrogen barrier properties of the coatings of nitride and diamondlike amorphous carbon (DLC) were evaluated. Using plasma chemical vapor deposition and sputtering, ZrN, TiAlN, AlCrN, CrN, and DLC coatings were deposited with a thickness of about 3 μm. It was confirmed …

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Hydrogen Permeation Behavior of Stainless Steels Treated with Nitrogen-Plasma

Motonori Tamura

The surface of austenitic stainless steel SUS316L was treated with nitrogen-plasma and its hydrogen permeability function was investigated.On the stainless steel surface, a nitride phase and a nitrogen-dispersed phase were found 5 m from the surface.The nitride phase was mainly consisting of …

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Hydrogen Permeation Characteristics of TiN-Coated Stainless Steels

Motonori Tamura

TiN films consisting of fine crystal grains, with diameters of about 100 nm or less, provided superior hydrogen-permeation barriers.Applying a coating of TiN on a stainless steel substrate reduced the hydrogen permeation by a factor of about 100 to 5,000 compared with …

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Nanostructured thin films for hydrogen-permeation barrier

Motonori Tamura

The authors confirmed that applying a coating of Al2O3, TiC, or TiN on a substrate reduced the hydrogen permeation by a factor of at least one order of magnitude compared with uncoated substrates. Al2O3 films consisting of fine crystal grains, with diameters …

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Characteristic change of hydrogen permeation in stainless steel plate by BN coating

Motonori Tamura, Masao NOMA, Michiru Yamashita

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