Uacj Corporation

The Furukawa Electric Co., Ltd.

Inter-university Research Institute Corporation National Institutes of Natural Sciences

Furukawa-sky Aluminum Corporation

Uacj Foundry & Forging Corporation

Toshio Ushiyama

Koichi Takahashi

Masahiro Sugimoto

Hirokazu Tsubouchi

Toshiya Okada

Kazuya Takahata

Toshiyuki Mito

Akihiro Minagawa

Takashi Kubo

Nobuhito Ishikawa

An aluminum alloy for casting, made of an Al&#x2014;Si&#x2014;Cu&#x2014;Mg alloy which consists of specific amounts of Si, Cu, and Mg, in addition to specifically desired amounts of titanium, phosphorus, boron, and optional additional chemical elements sodium and strontium, with the balance of the aluminum alloy comprising aluminum and any impurities. When a content of phosphorus is defined as X mass %, the content of phosphorus, a content of Y mass % of sodium, and a content of Z mass % of strontium satisfy the following relationships: 0.45Y+0.24Z+0.003&#x2264;X&#x2264;0.45Y+0.24Z+0.01; 0&#x2264;Y&#x2264;0.01; and 0&#x2264;Z&#x2264;0.03. The aluminum alloy ensures surface smoothness of a cast article by specifying the phosphorus content. This minimizes a surface segregation layer, even in production of a cast article using a molten metal containing a eutectic structure modifier such as sodium.

Aluminum alloy for low-pressure casting

An aluminum alloy cast impeller has a stable high-temperature strength (e.g., 0.2% proof stress value of 260 MPa or more) at about 200&#xb0; C. A boss part, blade parts, and a disc part have secondary dendrite arm spacings of 20 to 50 &#x3bc;m, 10 to 35 &#x3bc;m, and 5 to 25 &#x3bc;m, respectively, and satisfy the relationship Amax&#x3e;Bmax&#x3e;Cmax, where Amax, Bmax, and Cmax are the maximum values of the secondary dendrite arm spacings of the boss part, the blade parts, and the disc part, respectively. During casting, Al alloy molten metal is pressure injected into a 200 to 350&#xb0; C. plaster mold. A 100 to 250&#xb0; C. chill occurs on a surface in contact with an impeller disc surface, so that the chill temperature (&#xb0; C.)&#x3c;(plaster mold temperature&#x2212;50&#xb0; C.).

Al alloy cast impeller for compressor and process for producing same

Disclosed is a composite superconductor comprising a superconductor and a metal member. The metal member is composed of one or more members to be joined together in such manner that the one or more members cover the superconductor, and at least one member is made of aluminum or an aluminum alloy.

Composite superconductor

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Tokyo, Japan

Toshio Ushiyama