Other

Yoshida Kogyo K.k.

Tohoku Magnet Institute Co., Ltd.

Panasonic Corporation

Japan Science and Technology Corporation

Honda Motor Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Tohoku University

Teikoku Piston Ring Co., Ltd.

Teikoko Piston Ring Co., Ltd.

Nobuyuki Nishiyama

Akihiro Makino

Akihisa Inoue

Tsuyoshi Masumoto

Yukio Nishikawa

Toshisuke Shibata

Hiroyuki Horimura

Terutsugu Segawa

Tadashi Yamaguchi

Tao Zhang

Hideki Takeda

Hiroshi Yamagata

Tohru Kojima

Katsutoshi Nozaki

Kana Takenaka

Hisamichi Kimura

Takeshi Ogawa

Akira Kato

Haruko Yamazaki

Takahiro Aoki

Takeshi Suto

Takumi Sakamoto

Takeshi Kamoshida

Yasusi Takahagi

Kazuya Saito

Parmanand Sharma

A method for producing a magnetic core includes a processing step of giving a desired shape to a strip made of an alloy composition, a heat-treating step of forming bcc-Fe crystals, and then a stacking step of obtaining a magnetic core having a shape. Here, the alloy composition is Fe&#x2014;B&#x2014;Si&#x2014;P&#x2014;Cu&#x2014;C and has an amorphous phase as a primary phase. In the heat-treating step, the strip is heated up to a temperature higher than a crystallization temperature of the alloy composition at a high heating rate.

Method for producing laminated magnetic core

A heat treatment apparatus for a laminated body of amorphous alloy ribbon includes: a lamination jig that holds the laminated body of amorphous alloy ribbon; two heating plates that sandwich the laminated body from upper and lower surfaces in a lamination direction without coming into contact with the lamination jig; and a heating control apparatus that controls a heating temperature of the two heating plates.

Heat treatment apparatus for laminated body of amorphous alloy ribbon and soft magnetic core

A magnetic-plate laminated body includes: a laminated part made up of a plurality of laminated soft magnetic ribbons; first and second metal plates that sandwich the laminated part from upper and lower surfaces in a lamination direction of the laminated part; and a fastening mechanism that penetrates the first and second metal plates and the laminated part and fastening the laminated part by the first and second metal plates.

Magnetic-plate laminated body and motor

Alloy powder of a composition formula FeCoBSiPCuChaving an amorphous phase as a main phase is provided. Parameters satisfy the following conditions: 3.5&#x2264;a&#x2264;4.5 at %, 6&#x2264;b&#x2264;15 at %, 2&#x2264;c&#x2264;11 at %, 3&#x2264;d&#x2264;5 at %, 0.5&#x2264;e&#x2264;1.1 at %, and 0&#x2264;f&#x2264;2 at %. With this composition, the alloy powder has good magnetic characteristics even when it has a large particle diameter such as 90 &#x3bc;m. Therefore, yield thereof is improved.

Alloy powder and magnetic component

Disclosed is a beryllium-free copper alloy having high strength, high electric conductivity and good bending workability and a method of manufacturing the copper alloy. Provided is a copper alloy having a composition represented by the composition formula by atom %: Cu100-a-b-c(Zr, Hf)a(Cr, Ni, Mn, Ta)b(Ti, Al)c [wherein 2.5&#x2266;a&#x2266;4.0, 0.1&#x3c;b&#x2266;1.5 and 0&#x2266;c&#x2266;0.2; (Zr, Hf) means one or both of Zr and Hf; (Cr, Ni, Mn, Ta) means one or more of Cr, Ni, Mn and Ta; and (Ti, Al) means one or both of Ti and Al], and having Cu primary phases in which the mean secondary dendrite arm spacing is 2 &#x3bc;m or less and eutectic matrices in which the lamellar spacing between a metastable Cu5(Zr, Hf) compound phase and a Cu phase is 0.2 &#x3bc;m or less.

Copper alloy and method of manufacturing copper alloy

A molten alloy having an amorphous forming ability is pressure-solidified at a pressure exceeding one atmospheric pressure to eliminate casting defects. The cooling rate during the solidification is adjusted to disperse fine crystals having a mean crystal grain diameter of 1 nm to 50 &mgr;m and a volume percentage of 5 to 40% in an amorphous alloy ingot. In this way, a uniform residual compressive stress is imparted in the amorphous alloy ingot. Furthermore, the amorphous ingot produced by this method can be strengthened by heating it at a constant temperature rising rate to infiltrate at least one of boron, carbon, oxygen, nitrogen and fluorine from the surface of the amorphous alloy ingot in a supercooled liquid state before crystallization, to thereby precipitate a high melting point compound thereof with an element forming the amorphous alloy within the alloy ingot so as to strength the alloy.

Method for producing an amorphous alloy having excellent strength

A molten alloy was pressure-solidified under a pressure exceeding one atmospheric pressure to eliminate casting defects. The molten alloy was solidified by applying a cooling rate difference to the surface and the interior of the molten alloy to allow a compressive stress layer to remain on the surface of the amorphous alloy ingot and a tensile stress layer in the interior portion. Thus, a amorphous alloy sheet having a thickness of 1 mm or more and excellent in bending strength and impact strength is obtained.

Method of producing amorphous alloy excellent in flexural strength and impact strength

Disclosed herein is a process for forming an amorphous alloy material capable of showing glass transition, which comprises holding the material between frames arranged in combination; and heating the material at a temperature between its glass transition temperature (Tg) and its crystallization temperature (Tx) and, at the same time, producing a pressure difference between opposite sides of the material, whereby the material is brought into close contact against a forming mold disposed on one side of the material. As an alternative, the forming mold is brought into close contact against the amorphous material in a direction opposite to the pressing direction for the amorphous material. By the above processes, precision-formed products of amorphous alloys can be manufactured and supplied at low cost. These formed amorphous alloy products can be used as mechanical structure parts and components of high strength and high corrosion resistance, various strength members, electronic parts, arts and crafts, original printing plates, or the like.

Forming process of amorphous alloy material

An electrode having an excellent corrosion resistance and long service life even in a severe corrosive environment such as in NaCl solutions for anode electrolysis in which chlorine gas or the like is produced at a high potential from the alloy surface. The electrode of the invention is provided using a precious metal-based amorphous alloy which has a good plasticity processibility and is applicable to a large-sized component. The object is implemented by provision of an electrode material for anode electrolysis which utilizes a precious metal-based amorphous alloy which satisfies the general formula NM.sub.100-a-b-c Ni.sub.a Cu.sub.b P.sub.c wherein NM comprises one or two precious metal elements selected from Pd and Pt; a, b and c being atomic percent, satisfy that 30.ltoreq.a+b.ltoreq.45,3.ltoreq.b/a.ltoreq.7, and 18.ltoreq.c.ltoreq.25, respectively; Pt is contained from 10 to 30 atom percent (at. %); and wherein a temperature width .DELTA.Tx in the supercooled liquid region (.DELTA.Tx=Tx-Tg) has a width of 70 K or more.

Anode electrolysis electrode material using precious metal-based

Deposition of a hard film of Ti-Si-N composite material on a substrate is carried out by using a source of evaporation possessing a composition of Ti.sub.a Si.sub.b (wherein 'a' and 'b' stand for atomic percentages respectively falling in the ranges of 75 at % .ltoreq.a.ltoreq.85 at % and 15 at %.ltoreq.b.ltoreq.25 at %, providing a+b=100 at %). Deposition is effected by a sputtering process or ion plating process in an atmosphere of an inert gas containing a nitrogen-containing reaction gas while controlling the feed rate of the reaction gas into a chamber in such a manner that the partial pressure of nitrogen is kept constant or varied continuously or stepwise. By this method there can be obtained a film having fine TiN crystalline particles uniformly dispersed in the matrix phase of Ti-Si amorphous metal or a film of functionally gradient structure in which the ratio of fine TiN crystalline particles dispersed in the matrix phase increases continuously or stepwise in the direction of thickness of the film.

Hard film of amorphous Ti-Si alloy having fine tin particles

Deposition of a hard film of Ti--Si--N composite material on a substrate is carried out by using a source of evaporation possessing a composition of Ti.sub.a Si.sub.b (wherein 'a' and 'b' stand for atomic percentages respectively falling in the ranges of 75 at %.ltoreq.a.ltoreq.85 at % and 15 at %.ltoreq.b.ltoreq.25 at %, providing a+b=100 at %). Deposition is effected by a sputtering process or ion plating process in an atmosphere of an inert gas containing a nitrogen-containing reaction gas while controlling the feed rate of the reaction gas into a chamber in such a manner that the partial pressure of nitrogen is kept constant or varied continuously or stepwise. By this method, there can be obtained a film having fine TiN crystalline particles uniformly dispersed in the matrix phase of Ti--Si amorphous metal or a film of functionally gradient structure in which the ratio of fine TiN crystalline particles dispersed in the matrix phase increases continuously or stepwise in the direction of thickness of the film.

Method of producing hard film of Ti-Si-N composite material

An amorphous magnesium alloy has a composition of Mg.sub.a M.sub.b X.sub.c (M is Zn and/or Ga, X is La, Ce, Mm (misch metal), Y, Nd, Pr, Sm and Gd), a is from 65 to 96.5 atomic %, b is from 3 to 30 atomic %, and c is from 0.2 to 8 atomic %). The magnesium alloy has a high specific strength and does not embrittle at room temperature.

High-strength amorphous magnesium alloy

Growing community of inventors

Sendai, Japan

Nobuyuki Nishiyama