Sumitomo Electric Industries, Limited

A.l.m.t. Corporation

Toyoda Automatic Loom Works, Ltd.

Sumitomo Electric Industreis, Ltd.

Toshiya Ikeda

Yoshihiro Nakai

Masatada Numano

Taichiro Nishikawa

Mitsuyuki Kobayashi

Isao Iwayama

Yoshiyuki Takaki

Shigeki Koyama

Takayuki Kato

Misato Kusakari

Shinichi Sato

Norikazu Deto

Kiyotaka Utsunomiya

Akira Fukui

Masahiro Omachi

Masashi Nojiri

Yoshiki Kishikawa

A casting nozzle suited to manufacture a casting material of pure magnesium or magnesium alloy is provided. A nozzle is utilized to manufacture a casting material by supplying molten metal to a portion between rolls which become a casting die, and arranged so that a pouring port is located between a pair of rolls opposed to other. This nozzle includes a main body formed of oxide material such as alumina, and a coating layer which is provided on the inner surface of the main body which comes into contact the molten metal, and formed of material that does not include oxygen substantially. Since the main body does not come into direct contact with the molten metal due to the coating layer, it is possible to prevent oxygen included in the main body from reacting with the molten metal. Further, in the nozzle, a casting die contact portion which comes into contact with the rollers is formed of thermal insulation material, whereby it is prevented that the molten metal in the nozzle is cooled through the casting die contact portion by the rollers.

Casting nozzle

A magnesium alloy material such as a magnesium alloy cast material or a magnesium alloy rolled material, excellent in mechanical characteristics and surface precision, a producing method capable of stably producing such material, a magnesium alloy formed article utilizing the rolled material, and a producing method therefor. The magnesium material includes a melting step of melting a magnesium alloy in a melting furnace to obtain a molten metal, a transfer step of transferring the molten metal from the melting furnace to a molten metal reservoir, and a casting step of supplying a movable mold with the molten metal from the molten metal reservoir, through a pouring gate, and solidifying the molten metal to continuously produce a cast material. Parts are formed by a low-oxygen material having an oxygen content of 20 mass % or less. The cast material is given a thickness of from 0.1 to 10 mm.

Producing method for magnesium alloy material

A magnesium-based composite member is provided with a through hole through which a fastening member for attachment to a fixing target is to be inserted. A substrate is provided with a substrate hole through which the fastening member is to be inserted, and made of a composite material which is a composite of SiC and a matrix metal which is any of magnesium and a magnesium alloy. A receiving portion is attached to the substrate and made of a metal material different from the matrix metal. The receiving portion is provided with a receiving portion hole through which the fastening member is to be inserted, and at least a part of an inner circumferential surface of the through hole is formed from an inner circumferential surface of the receiving portion hole.

Magnesium-based composite member, heat radiation member, and semiconductor device

A composite member has a substrate made of a composite material having SiC combined with magnesium or a magnesium alloy, and has a warpage degree of not less than 0.01&#xd7;10and not more than 10&#xd7;10, the warpage degree being defined as lmax/Dmax, where lmax being a difference between a maximum value and a minimum value of surface displacement of one surface of composite member measured along a longest side thereof, and Dmax being a length of the longest side. Thereby, a composite member capable of efficiently dissipating heat to an installation object, a heat-dissipating member using the composite member, and a semiconductor device having the heat-dissipating member are provided.

Composite member including substrate made of composite material

A composite member suitable for a heat radiation member of a semiconductor element and a method of manufacturing the same are provided. This composite member is a composite of magnesium or a magnesium alloy and SiC, and it has porosity lower than 3%. This composite member can be manufactured by forming an oxide film on a surface of raw material SiC, arranging coated SiC having the oxide film formed in a cast, and infiltrating this coated SiC aggregate with a molten metal (magnesium or the magnesium alloy). The porosity of the composite member can be lowered by improving wettability between SiC and the molten metal by forming the oxide film. According to this manufacturing method, a composite member having excellent thermal characteristics such as a coefficient of thermal expansion not lower than 4 ppm/K and not higher than 10 ppm/K and thermal conductivity not lower than 180 W/m&#xb7;K can be manufactured.

Composite member

A casting nozzle suited to manufacture a casting material of pure magnesium or magnesium alloy is provided. A nozzleis utilized to manufacture a casting materialby supplying molten metal to a portion between rollswhich become a casting die, and arranged so that a pouring portis located between a pair of rollsopposed to other. This nozzleincludes a main bodyformed of oxide material such as alumina, and a coating layerwhich is provided on the inner surface of the main bodywhich comes into contact the molten metal, and formed of material that does not include oxygen substantially. Since the main bodydoes not come into direct contact with the molten metal due to the coating layer, it is possible to prevent oxygen included in the main bodyfrom reacting with the molten metal. Further, in the nozzle, a casting die contact portionwhich comes into contact with the rollersis formed of thermal insulation material, whereby it is prevented that the molten metal in the nozzleis cooled through the casting die contact portionby the rollers

A heat sink substrate has a composite structure including a three-dimensional network structure of SiC ceramic having pores infiltrated with Si, and has a thermal conductivity of not less than 150 W/m&#xb7;K and an oxygen content of not greater than 7 ppm. The heat sink substrate is easily allowed to have an increased surface area. Further, the heat sink substrate has a higher thermal conductivity and a coefficient thermal expansion close to that of the SiC. Therefore, the heat sink substrate is superior in the efficiency of heat conduction from a semiconductor device. The heat sink substrate is produced by infiltrating a thermally melted Si into the pores of the three-dimensional network structure in a non-oxidative atmosphere in the presence of an oxygen absorber.

Heat sink substrate and production method for the same

A magnesium alloy material such as a magnesium alloy cast material or a magnesium alloy rolled material, excellent in mechanical characteristics and surface precision, a producing method capable of stably producing such material, a magnesium alloy formed article utilizing the rolled material, and a producing method therefor. The magnesium material producing method includes a melting step of melting a magnesium alloy in a melting furnace to obtain a molten metal, a transfer step of transferring the molten metal from the melting furnace to a molten metal reservoir, and a casting step of supplying a movable mold with the molten metal from the molten metal reservoir, through a pouring gate, and solidifying the molten metal to continuously produce a cast material. Parts are formed by a low-oxygen material having an oxygen content of 20 mass % or less. The cast material is given a thickness of from 0.1 to 10 mm.

A casting nozzle for supplying a molten alloy liquid of aluminum alloy or magnesium alloy to a movable mold for continuous casting from a tundish, in which the molten alloy liquid is stored. The casting nozzle is fixed to the tundish. The casting nozzle tip arranged on the movable mold side is made of a highly heat-conductive material having a heat conductivity of 0.2 W/mK or more, and a highly elastic material having an elastic modulus of 5000 MPa or more, etc. By making the tip of the casting nozzle with a material having superior thermal conductivity, the irregularity in solidification of the molten alloy liquid is decreased and thereby the surface quality of a cast alloy is improved. The nozzle tip is formed with a material having high elasticity and superior elastic deformability, whereby the interstice between the movable mold and the tip of outer peripheral edge of the nozzle is narrowed, and accordingly a cast alloy having superior surface quality can be obtained.

The wear resistant aluminum alloy elongate body contains 7-13 mass % of Si, 0.001-0.3 mass % of iron, 2.0-5.0 mass % of Cu, 0.3-1.0 mass % of Mg, 0.001-0.3 mass % of Mn, 0.001-0.3 mass % of Cr, 0.003-0.03 mass % of Sr, 0.005-0.05 mass % of Ti, and the remaining part of Al and unavoidable impurity. The size of Si grains existing in the elongate body is, by the average value, at most 10 &#x3bc;m and by the maximum value, at most 30 &#x3bc;m, and the size of the Si grains in the range of down to 1.5 mm deep from the surface is, by the maximum value, at most 6 &#x3bc;m. Further, crystal texture of Al alloy is one selected from the group consisting of hot rolled texture, re-crystallized texture and mixed texture of hot rolled texture and re-crystallized texture.

Growing community of inventors

Osaka, Japan

Toshiya Ikeda