Hitachi, Ltd.

Kiyoshi Otaka

Tadahiko Miyoshi

Shigeoki Nishimura

Manabu Madokoro

Tetsuo Oyama

Katsuhiko Shiota

Hisamitsu Hatoh

Kenichi Onisawa

Ko Soeno

Mitsuo Chigasaki

Akira Okayama

A highly reliable sodium-sulfur battery includes a cell container for the positive electrode which is hardly deteriorated by corrosion. The cell container for the positive electrode is assembled by integrating plural members made of a high corrosion resistant alloy containing Cr, or a Co base alloy containing Cr, Ni and Mo, wherein carbide containing at least one of Cr, W and Mo is precipitated, and a readily deformable portion is provided to the cell container for the positive electrode, whereby reliability of the sodium-sulfur battery can be significantly improved.

Sodium-sulfur battery, and a battery system using same

A highly reliable sodium-sulfur battery includes a cell container for the positive electrode which is hardly deteriorated by corrosion. The cell container for the positive electrode is made of a Co base alloy containing Cr, Ni, and Mo, wherein carbide containing at least one of Cr, W, and Mo is precipitated, or the cell container for positive electrode is assembled by integrating plural members made of a high corrosion resistance alloy containing Cr by welding, and a readily deformable portion is provided to the cell container for positive electrode, whereby the reliability of the sodium-sulfur battery can be significantly improved.

A structure comprising a main body formed of a nickel base alloy, and a NiAl coating applied to the main body, wherein the NiAl coating includes a nickel rich NiAl layer and an aluminum rich NiAl layer and the thickness ratio of the nickel rich NiAl layer to the whole NiAl coating is in a range between 20 and 40%. A method of applying an aluminum coating to a nickel base alloy comprising the steps of forming an aluminide layer of Ni.sub.2 Al.sub.3 on the surface portion of the nickel base alloy by the diffusion and penetration of aluminum, and subjecting the alumide layer to heat treatment to change the aluminide layer to a monoaluminide layer and making the thickness ratio of a nickel rich NiAl layer to the whole monoaluminide layer be in the range between 20 and 40%.

Method of producing nickel base alloy structure with NiAl coating

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Takahagi, Japan

Kiyoshi Otaka