EP0373180A1 - Verfahren zum vergrössen der spezifischen masse und verbesserung der homogenität des chevrel-phasen-puders und nach diesem verfahren hergestellte chevrel-phasen-drähte - Google Patents

Verfahren zum vergrössen der spezifischen masse und verbesserung der homogenität des chevrel-phasen-puders und nach diesem verfahren hergestellte chevrel-phasen-drähte

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Publication number
EP0373180A1
EP0373180A1 EP89901449A EP89901449A EP0373180A1 EP 0373180 A1 EP0373180 A1 EP 0373180A1 EP 89901449 A EP89901449 A EP 89901449A EP 89901449 A EP89901449 A EP 89901449A EP 0373180 A1 EP0373180 A1 EP 0373180A1
Authority
EP
European Patent Office
Prior art keywords
powders
chevrel
phases
chevrel phases
additive substances
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89901449A
Other languages
English (en)
French (fr)
Inventor
Bernd Seeber
Oystein Fischer
Michel Decroux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Promogap
Original Assignee
Promogap
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Promogap filed Critical Promogap
Publication of EP0373180A1 publication Critical patent/EP0373180A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/01—Manufacture or treatment
    • H10N60/0212—Manufacture or treatment of devices comprising molybdenum chalcogenides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S505/00—Superconductor technology: apparatus, material, process
    • Y10S505/80—Material per se process of making same
    • Y10S505/815—Process of making per se
    • Y10S505/823—Powder metallurgy

Definitions

  • the present invention relates to a method for increasing the specific mass and improving the homogeneity of the powders of Chevrel phases.
  • New materials called Chevrel phases are ternary molybdenum chalcogenides of formula ⁇ X j .
  • M is a metal, in particular tin, lead or lanthanum
  • X is a chalcogen.
  • PbMo, Sg, Sn o ⁇ Sg, LaMo é Se g are remarkable superconductors and in particular have very high critical fields which predestines them for the realization of coils allowing to generate static magnetic fields higher than approximately 18 Tesla.
  • PbMo, S g (PMS) constitutes a particularly advantageous combination from the practical point of view since its critical temperature is 15 ° K and its critical field is of the order of 52 Tesla at a temperature from, 2 ° K.
  • the superconductor To generate high magnetic fields, the superconductor must be in the form of a wire capable of being wound.
  • Various tests have been carried out to allow the production of wires with Chevrel phases. We can distinguish two different techniques, one consisting in depositing the Chevrel phases in the gas phase on a suitable substrate in the form of a wire, cable or strip, the other using the powder metallurgies described in the article. "Ternary Supraconuctors, Eds. Shenoy, Dunlap, Elsevier North Holland, 1981, Page 119".
  • techniques in powder metallurgy have proved to be the most advantageous.
  • the powders of Chevrel phases are generally ground after their last heat treatment in such a way that their grains have dimensions of less than 1 ⁇ m.
  • This crushing-grinding operation is carried out for example in a grinder.
  • the powder of Chevrel phases is pressed isostatically cold or hot in the form of a cylinder and then inserted under vacuum into one or more metal sleeves.
  • special steel is associated with a molybdenum diffusion barrier (see the article Proceedings of the International Conference on Magnet Technology MT9, Zurich 1985, page 560).
  • Other diffusion barriers such as niobium, tantalum or silver can also be used.
  • the Chevrel phase superconductor is extruded during a first deformation step at a temperature between 1000 ° C and 1600 ° C so that its section undergoes a reduction in a proportion of 1 to 10. This first deformation step is followed by several deformation steps including hammering and / or drawing / drawing at hot.
  • the critical current density of the Chevrel phases thus produced is comparable to that of Nb.Sn for higher magnetic field intensities, which makes them usable for the manufacture of superconductive coils.
  • the main purpose of the European patent application published under No. 0138719, is to eliminate or reduce the porosities between the grains of powder of Chevrel phases, which are supposed to be responsible for a low level of density. current in the filament.
  • This object is achieved by the addition of metallic powders with a particle size smaller than that of Chevrel phase powders.
  • These metallic powders are made of aluminum, silver, gallium, rhenium and titanium, because the annealing temperature after wire drawing can be reduced to around 800 ° C.
  • the binder must not degrade parameters such as the critical temperature T, the critical field H _ and the critical current density J,
  • the object of the present invention is to improve the specific mass of the Chevrel phase superconductors and thereby increase their critical current density. It is in fact a question of closing the residual pores of probably microscopic dimensions. In addition, a better bond is sought between the powder particles of individual Chevrel phases and consequently an improvement in the homogeneity of the superconductors by a better chemical reaction between the particles.
  • these additive substances are introduced in the form of powders and hot sintering is carried out in the liquid or gas phase.
  • the additive substances are introduced by coating the powders of Chevrel phases by a physical or chemical process. This coating is advantageously carried out by vaporization.
  • the additive substances are preferably chosen in such a way that they have a particular affinity for parasitic chemical elements such as oxygen.
  • said additive substances include lead and / or tin and / or mixtures or alloys of lead and tin.
  • the powders of additive substances are introduced in the form of grains, the dimensions of which are preferably less than 1 dm.
  • These Chevrel phase powders are preferably compounds based on lead, molybdenum and sulfur (PbMo, Sg).
  • PbMo, Sg molybdenum and sulfur
  • Chevrel phase powders stoichiometric or non-stoichiometric mixtures of PbS, MoS- and Mo.
  • chemical transport agents are chosen chosen from the halides and chalcogenides of the metals included in the composition of the Chevrel phases.
  • the yarn obtained according to the method of the invention is characterized in that it comprises powders of Chevrel phases whose specific mass and homogeneity, and therefore the critical current density, are increased by the method described.
  • a powder or a mixture of powders prepared to form a Chevrel phase is added (for example a compound of a metal with a low melting temperature (by example tin, lead or an alloy of tin and lead).
  • This addition is carried out in a proportion of 0.5 to 20% by weight and is then subjected to a sintering process in the liquid or gas phase at a temperature which is between 500 ° C and 1700 ° C.
  • the mixture is treated in a mixer for 2 to 24 hours.
  • the mixture is pressed isostatically cold or hot to provide the product with a shaping capable of allowing its introduction into a extruder-extruder.
  • a coating of the powder of Chevrel phases is carried out by a known physical or chemical process by means of a metal with a low melting temperature such as, for example, tin, lead, etc., or by means of an alloy having the same characteristics, such as for example an alloy of tin and lead.
  • the Chevrel phases thus treated are subjected to sintering in the liquid or gas phase, at a temperature between 500 ° C and 1700 ° C. As before, the mixture is pressed isostatically cold or hot.
  • a substance serving as a chemical transport agent is added to the Chevrel phase powder, such as the halides and chalcogenides of the metals included in the composition of the Chevrel phases in a proportion ranging from 1 to 10% by weight and this mixture is subjected to sintering in the liquid or gas phase at a temperature between 500 ° C and 1700 ° C.
  • the following low-melting substances can be mixed with the powder of Chevrel phase powders or powder mixtures: bismuth, gallium, indium, antimony, thallium or alloy of these substances with lead or tin. An isostatic hot or cold pressing is then carried out on these mixtures.
  • Sintering in the liquid or gas phase can be carried out before, during or after the shaping of the wire by extrusion, hammering or rolling and drawing / drawing.
  • the additives melt and form a liquid or gaseous phase promoting diffusion between the particles constituting the powders of Chevrel phases. They accelerate the homogenization of the material, which makes it possible to obtain a quasi-welding of the powdery particles.
  • a transport agent for example halides and chalcogenides of the metals used in the composition of the Chevrel phases
  • Chevrel phase wires produced according to this process are essentially characterized by an increase in the critical current density by a factor of 2 to 3 compared to this quantity measured on conventional Chevrel phase wires. Therefore, one can validly consider industrially making wires or wires with Chevrel phases.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Powder Metallurgy (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
EP89901449A 1988-01-22 1989-01-20 Verfahren zum vergrössen der spezifischen masse und verbesserung der homogenität des chevrel-phasen-puders und nach diesem verfahren hergestellte chevrel-phasen-drähte Withdrawn EP0373180A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8800900 1988-01-22
FR8800900A FR2626410B1 (fr) 1988-01-22 1988-01-22 Procede pour augmenter la masse specifique et ameliorer l'homogeneite des poudres de phases chevrel et fil a phases chevrel obtenu selon ce procede

Publications (1)

Publication Number Publication Date
EP0373180A1 true EP0373180A1 (de) 1990-06-20

Family

ID=9362668

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89901449A Withdrawn EP0373180A1 (de) 1988-01-22 1989-01-20 Verfahren zum vergrössen der spezifischen masse und verbesserung der homogenität des chevrel-phasen-puders und nach diesem verfahren hergestellte chevrel-phasen-drähte

Country Status (5)

Country Link
US (1) US5314714A (de)
EP (1) EP0373180A1 (de)
JP (1) JPH02503308A (de)
FR (1) FR2626410B1 (de)
WO (1) WO1989006864A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02206504A (ja) * 1989-02-03 1990-08-16 Koujiyundo Kagaku Kenkyusho:Kk 超電導材料加工物
US7378376B2 (en) * 2002-11-08 2008-05-27 Nove' Technologies, Inc. Gallium-based superconducting composite
US20050220699A1 (en) * 2004-04-01 2005-10-06 Yosef Gofer Method for preparing Chevrel phase materials
US7745376B2 (en) * 2004-08-10 2010-06-29 Nove Technologies, Inc. Superconducting composite
US8389129B2 (en) * 2010-07-09 2013-03-05 Climax Engineered Materials, Llc Low-friction surface coatings and methods for producing same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2553565B1 (fr) * 1983-10-18 1987-04-10 Comp Generale Electricite Procede d'elaboration de brins supraconducteurs multifilamentaires a partir de chalcogenure ternaire de molybdene
DE3569314D1 (en) * 1984-07-09 1989-05-11 Mitsubishi Electric Corp A process for producing a pbmo6s8 type compound superconductor
CA1263449A (en) * 1985-05-16 1989-11-28 Director, National Research Institute For Metals Method of manufacturing a superconductor compounds layer
FR2599189B1 (fr) * 1986-05-22 1988-11-10 Centre Nat Rech Scient Brin ou ruban hybride supraconducteur, son procede de preparation et brins multifilamentaires obtenus par association de tels brins hybrides
US4917871A (en) * 1987-04-09 1990-04-17 Moli Energy Limited Chevrel-phase syntheses and electrochemical cells
US4966749A (en) * 1987-10-16 1990-10-30 Matsushita Electric Industrial Co., Ltd. Manufacturing process for chevrel phase compounds

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8906864A1 *

Also Published As

Publication number Publication date
US5314714A (en) 1994-05-24
WO1989006864A1 (fr) 1989-07-27
FR2626410A1 (fr) 1989-07-28
JPH02503308A (ja) 1990-10-11
FR2626410B1 (fr) 1991-04-26

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