摘要:
Eine zB aus Chrom und Titan im Atom-Verhältnis 40:60 bestehende Legierung wird in eine metastabile Kristall modifikation versetzt, indem die Legierung zB im Lichtbogen erhitzt und in Wasser abgeschreckt wird. Die metastabile Kristallmodifikation wird unterhalb der Glastemperatur so lange getempert, zB bei 600°C wäh rend 48 Stunden, bis sie vollständig verglast ist. Das erfindungsgemässe Verfahren ermöglicht die Herstel lung grosser, amorpher, harter und porenfreier Legie rungsstücke mit Dicken im cm-Bereich.
摘要:
A process for manufacturing amorphous alloy powders is provided, wherein, a high-speed fluid jet is blown against a flowing melt of an alloy which can be formed into amorphous powders, thereby powerizing the melt and rapidly cooling and solidifying the melt. Use is made of an action tube (4) in which pressure is reduced and turbulent flow is caused so as to increase the cooling rate of the powderized alloy and to form particles of irregular shape. Further, the powderized alloy particles are forced to forcibly collide against a block to increase the cooling rate of the alloy and to form particles of irregular shape.
摘要:
Dispositif pour la coulée d'un métal en phase pâteuse, qui comprend entre un récipient de coulée (1) muni d'une busette (3) et une lingo tière de coulée continue (11), un canal (6) refroidi, dont l'extrémité amont, par rapport au sens d'écoulement du métal, est raccordée à la sortie de la busette (3) et dont l'extrémité aval est pourvue de moyens (8) d'introduction du métal liquide dans la lingotière (11) dans lequel les moyens d'introduction (8) comprennent un conduit dont l'extrémité inférieure se termine par un ajutage dont le diamètre (D₂) de la section de sortie est inférieur au diamètre (D₁) de la busette (3). Le canal (6) peut être constitué par un conduit tubulaire présentant une section intérieure supérieure à la section de sortie de ladite busette, ou par un chenal pourvu d'un garnissage en matériau réfrac taire et d'une voûte étanche aux gaz équipée, sur au moins une partie de sa longueur,de moyens de refroidissement par air.
摘要:
An amorphous magnetic alloy of Co-Nb-Zr system contains Co, Nb and Zr and has a composition which falls, in terms of atomic percent, within the region defined by straight lines connecting, in a ternary composition diagram assuming the total of contents of these three elements to be 100, a point (81% Co, 14% Nb, 5% Zr), a point (88% Co, 9% Nb, 3% Zr), a point (86.5% Co, 12.5% Nb, 1% Zr) and a point (81% Co, 18% Nb, 1% Zr). Disclosed also is a magnetic head having a core at least a part of which is constituted by this amorphous magnetic alloy. This magnetic head, when used in combination with a metal powder tape having a high coercive force, provides a remarkably increased recording-reproducing output.
摘要:
Disclosed is a temperature sensitive amorphous magnetic alloy which shows a Curie point of not higher than 200°C and whose composition is represented by the formula: wherein M = Co or Fe; X = at least one of P, B, C and Si; 0.2≤a≤0.8 when M is Co, or 0.4≤a≤0.9 when M is Fe; and 15≤z≤30.
摘要:
A homogeneous boron containing alloy is disclosed with a composition which can be essentially represented by the formula of: M i T j B k where M is a metal from the group of nickel, iron, cobalt or a mixture thereof; T is a refractory metal from the group of molybdenum, tungsten, or a mixture thereof and B is the element boron. The subscripts i, j, k are the respective atomic percent of each of the constituents and vary respectively between about 25 and 98, between about 1 and 40, and between 1 and 35 with the proviso that j > k, and i + j + k = 100. By further limitation of the chemistry, it is possible to assure the alloy will age harden.
摘要:
Die Erfindung betrifft ein Verfahren zur Herstellung von dispersionsgehärteten Legierungen auf der Basis von Kupfer, bei denen eine Wärmeversprödung vermieden wird. Dies wird nach der Erfindung dadurch erreicht, daß der Kupferschmelze Anteile von Molybdän und/oder Wolfram zugefügt werden und das Gemisch um 200 bis zu 1000°C überhitzt und anschließend einer sehr raschen Abkühlung bis zur Erstarrung der Schmelze von mindestens 10⁴ bis 10⁶°C/Sek. unterworfen wird.
摘要:
Herein disclosed are apparatuses for manufacturing compound semiconductor polycrystals comprises a pressure vessel, an upper shaft, a container for first component fixed to the upper shaft, a heater around the container, a lower shaft, a susceptor and a crucible for charging second component, a heater for the crucible and a communicating means for spatially connecting the container and the crucible optionally provided with a porous member at the lower extremity and/or a cylindrical member for confining a space over a part of melt surface contained in the crucible from the remaining inner space of the vessel, the apparatuses permitting the substantial reduction of reaction time and the improvement of the yield of the polycrystals due to the presence of the porous member and/or the cylindrical member separating the inner space of the vessel into two portions.
摘要:
Nitrogen-containing amorphous alloys having a combination of superior properties which are highly valuable and desirable for ferromagnetic materials or superconducting materials are produced by sputtering metallic materials and nitrogen compounds containing semi-metal or semiconducting metal, such as boron or silicon, without requiring the use of nitrogen gas. The produced alloy has a novel structure, represented by the formula: (wherein M is at least one metal or alloy; L is at least one semimetal or semiconducting element; and x, y and z are fractional atomic percentages totaling 100 (i.e., x+y+z = 100) and the value of y+z being 10 or more and the respective values of x, y, z being not zero).
摘要:
An inorganic fiber-reinforced metallic composite material comprising a matrix of a metal or its alloy and inorganic fibers as a reinforcing material, characterized in that (a) the inorganic fibers are inorganic fibers containing silicon, either titanium or zirconium, nitrogen and oxygen and being composed of (i) an amorphous material consisting substantially of Si, M, N and 0, or (ii) an aggregate consisting substantially of ultrafine crystalline particles with a particle diameter of not more than 500 A of Si 2 N 2 O, MN, Si 3 N 4 and/or MN 1-x , and amorphous Si0 2 and MO 2 , provided that in the above formulae, M represents titanium or zirconium, and x is a number represented by 0 (iii) a mixture of the amorphous material (i) and the aggregate (ii), and (b) said metal is selected from the group consisting of aluminium, magnesium, and titanium, or (c) said alloy is selected from the group consisting of aluminum alloys, magnesium alloys and titanium alloys.