Method for manufacturing superconductor windings (alternatives)

FIELD: applied superconductivity.

SUBSTANCE: proposed method that can be used for manufacturing mechanically loaded superconductor windings designed for sustaining conductor stress higher than 100 MPa as well as superconductor windings and devices designed for operation under variable conditions, such as superconducting magnets for charged particle accelerators and superconductor inductive energy storages involves use of liquid epoxy resin as filler doped with finely dispersed powder of rare-earth intermetallide, for instance HoCu2 (holmium-copper) or CeCu2 (cerium-copper). Filler concentration is chosen between 20 and 50% of liquid epoxy resin volume.

EFFECT: enhanced performance characteristics of superconductor windings under variable conditions.

4 cl, 2 dwg

 

The invention relates to the field of applied superconductivity and can be used in the manufacture of mechanically loaded superconducting windings (with the voltage of the conductor is greater than 100 MPa at work), and superconducting windings and devices operating in variable modes, such as superconducting magnets for particle accelerators and superconducting inductive energy storage.

The closest technical solution is a method of manufacturing a superconducting windings, which are wound coils of superconductor close to each other and simultaneously coat of liquid epoxy resin with fillers, such as silicate of zirconium or boron nitride with a concentration of 70%-80% by weight of the mixture to prevent cracking her when cooled to low temperatures, and turns coat completely with filling interturn space. If necessary, in the winding perform cooling channels between the turns or layers, then turns coat partially, see M. Wilson, Superconducting magnets, Moscow, Mir, 1985, s-383.

The disadvantage of this method is the limited ability of the working windings in variable modes at speeds of change of magnetic field is greater than or of the order of 0.5 T/C. these modes in time-varying magnetic field in excess of what Roudnice heat, which must be absorbed or winding due to its own heat, if the winding has no channels for the passage of refrigerant (full promazyvanie turns of superconductor epoxy resin), or the refrigerant in the channels, if they are in the winding (partial promazyvanie turns of superconductor epoxy resin with the performance of the cooling channels). Since the heat-absorbing ability of the superconducting windings is limited by heating to the critical temperature of the superconductor, and the refrigerant in the channels, respectively, critical phenomena in heat transfer on the surface of the heated superconductor, especially in narrow channels (crisis mode boil with sharp, in tens of degrees, increasing temperature), hence there are temporary restrictions on the operation of superconducting windings in variable modes.

The technical result is to increase the performance of superconducting windings operating in variable modes, for example, increasing the maximum rate of change of the magnetic field at which the still superconducting state in the winding and to increase their own magnetic field in the winding for a fixed value of the speed of its growth, increased resistance of the windings to pulsed thermal mechanical origin at high mechanical stresses (≥100 MPa), th is allows you to extend the functionality of the superconducting windings.

The technical result is achieved in that in the method of manufacturing a superconducting windings, which in the process of winding the coils of superconductor placed against each other and coat with liquid epoxy resin with fillers, preventing cracking of the latter, while cooling, and coat the coils completely fill interturn space, or partially performing cooling channels between the turns or layers, as filler in epoxy resin add fine powder of rare-earth intermetallic with anomalously high heat capacity at low temperatures, as filler in epoxy resin add fine powder of rare-earth intermetallic Wear2(holmium-copper) or CeCu6(cerium-copper), and the concentration of the filler powder of rare-earth intermetallic chosen in the range of 20%-50% of the volume of the mixture of liquid epoxy resin.

The invention is illustrated by drawings, where figure 1 presents the dependence of the current in the winding of the energy of an electromagnetic disturbance is necessary for transfer of the winding of the superconducting to the normal state for the windings, which for coating using epoxy resin with filler NB-boron nitride, as in the known method, and the other two made offer the m way with fillers Wear 2(holmium-copper) or sesi6(cerium-copper), figure 2 shows the dependence of the current in the winding of the maximum possible rate of change of the magnetic field of an electromagnetic disturbance while maintaining the superconducting state in the windings, one of which is made known method and two other proposed method, which is used for coating a mixture of epoxy resin and fine powder of rare-earth intermetallic made with filler NB-boron nitride and the other two made the proposed method with fillers Wear2or CeCu6.

The method is as follows.

A method of manufacturing a superconducting windings, which are wound coils of superconductor close to each other and simultaneously coat with their pre-prepared epoxy resin with filler. In the composition of the liquid epoxy resin as filler impose a fine powder of rare-earth intermetallic, for example HoCu2(holmium-copper) or sesi6(cerium-copper) with a volume share of 20%-50% of the total volume of the mixture. If necessary to obtain the desired working modes in the winding perform cooling channels, for example, between the coils or between layers depending on the design implementation. When the winding dense superconducting what bmode channels without cooling the entire surface of the superconductor coat cooked thick mixture, if it is already covered with electrical insulation, and then turns superconductor stacked to each other. With this mixture fill all the interturn space. If the superconductor is not isolated, then after complete coating his bare surface with a mixture of epoxy resin with fine powder of rare-earth intermetallic superconductor covered with a layer of electrical insulation, such as glass or polyamide film. Then the coils of superconductor is also placed close to each other. In this case, the interturn space will be filled with electrical insulation, and a mixture of epoxy resin with fine powder of rare-earth intermetallic fills the space between the superconductor and the insulation layer. Channels for cooling between the coils of superconductor perform in the process of winding, when it is covered with electrically isolated superconductor wrapped in the desynchronization of the glass pre-coated with a mixture of epoxy resin and fine powder of rare-earth intermetallic, which in this case is carried on the surface of the superconductor (partial impregnation). After solidification of the mixture winding is porous, permeable to the refrigerant. Cooling channels between the layers of the winding is performed, for example, paving strips of wax that after zastaveni the resin is removed with a solvent, or between the winding layers have a strip with a fluted surface facing the coils of superconductor, and in the process of winding this surface is not coated, so you get a partial impregnation.

The introduction of substances with an extremely high heat capacity (for example, when the boiling point of liquid helium at 4.2 K the heat capacity of rare earth intermetallic HoCu2450 times greater than that of copper) in the composition of the epoxy compound superconducting winding is significantly (about 5-10 times) increases its average volumetric heat capacity. Accordingly, in the same time increases its heat-absorbing capacity and the ability to withstand rapid changes of the magnetic field and pulsed local heat mechanical origin without heating of the superconductor below the critical temperature of transition to the normal state. When you reach the lower border of the volume concentration of rare-earth intermetallic 20% heat capacity of the mixture by about an order of magnitude more heat epoxy resin, and the upper limit of the volume concentration of 50% start to decrease the adhesive properties of the mixture of epoxy resin with fine powder of rare-earth intermetallic.

A method of manufacturing a superconducting winding in which the winding coat epoxy resin fine powder Napo is the preserver of rare-earth intermetallic, for example HoCu2(holmium-copper) or CeCu6(cerium-copper), allows to obtain a superconducting coil with enhanced performance in variable modes, such increased maximum rate of change of the magnetic field at which the still superconducting state in the winding. The method of manufacture of the windings allows you to increase the value of the self-magnetic field in the winding for a fixed value of the speed of its growth, see figure 1 winding made of the proposed method, remain superconducting at much higher values of the rate of change of the external magnetic field in electromagnetic disturbance: according to 2 and 3 respectively to windings with Wear2and CeCu6compared with the dependence of 1 to NB (known way). Epoxy compound fine powder of rare earth intermetallic compounds significantly increases the resistance of the winding to mechanical perturbations, see figure 2 in the windings, made known method in electromagnetic disturbance, significantly higher critical energy translating the winding of the superconducting to the normal state, according to 2 and 3 for winding respectively to Wear2and sesi6compared with the dependence of 1 to NB (known way).

1. A method of manufacturing berprestasi windings, where in the process of winding the coils of superconductor placed against each other and coat with liquid epoxy resin with fillers, preventing cracking of the latter, while cooling, and coat the coils completely fill interturn space, or partially performing cooling channels between the turns or layers, characterized in that as filler in epoxy resin add fine powder of rare-earth intermetallic with anomalously high heat capacity at low temperatures with a concentration of 20÷50% of the volume of the mixture of liquid epoxy resin and coated coils covered with a layer of electrical insulation.

2. A method of manufacturing a superconducting windings according to claim 1, characterized in that as filler in epoxy resin add fine powder of rare-earth intermetallic HoCu2(holmium-copper) or rare earth intermetallic CeCu6(cerium-copper).

3. A method of manufacturing a superconducting winding in which the winding process superconductor vrazbezhku wrapped around the glass, then the coils are placed close to each other, making the winding porous, permeable to the refrigerant, characterized in that on the surface of steklolenta pre-apply the mixture of liquid epoxy resin and fine powder is ecotilling of intermetallic with anomalously high heat capacity at low temperatures with a concentration of 20÷ 50% of the volume of the mixture.

4. A method of manufacturing a superconducting windings on p. 3, characterized in that the mixture of liquid epoxy resin using the fine powder of rare-earth intermetallic HoCu2(holmium-copper) or rare earth intermetallic CeCu6(cerium-copper).



 

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The invention relates to the field of growing single-crystal films

FIELD: applied superconductivity.

SUBSTANCE: proposed method that can be used for manufacturing mechanically loaded superconductor windings designed for sustaining conductor stress higher than 100 MPa as well as superconductor windings and devices designed for operation under variable conditions, such as superconducting magnets for charged particle accelerators and superconductor inductive energy storages involves use of liquid epoxy resin as filler doped with finely dispersed powder of rare-earth intermetallide, for instance HoCu2 (holmium-copper) or CeCu2 (cerium-copper). Filler concentration is chosen between 20 and 50% of liquid epoxy resin volume.

EFFECT: enhanced performance characteristics of superconductor windings under variable conditions.

4 cl, 2 dwg

FIELD: producing conducting layer of variable magnetization and coercive force along conductor or conductors by means of material spraying unit.

SUBSTANCE: proposed method for producing substrate to be used in code-dependent systems and locks incorporating provision for identifying not only shape but also magnetization distribution and coercive force of conductors includes formation of conducting layer on substrate by means of material spraying unit that has vacuum chamber, source of material to be sprayed, gas ion source at whose output ion arcs unequally bombard source of material to be sprayed so that stream of knocked-out atoms or ions of sprayed material on one end of source dominates over that of sprayed-material knocked-out atoms or ions on other end of source; conducting layer formed on sprayed substrate has varying magnetization and coercive force along direction of conductor or conductors.

EFFECT: enhanced reliability and protection of layers being identified against counterfeit.

1 cl, 1 dwg

FIELD: metallurgy.

SUBSTANCE: evaporative material includes a core made from high-melting metal with thermal capacity per unit volume of at least 2 MJ/Km3 and having through holes. The core is coated with rare-earth metal or its alloy by melting of rare-earth metal or its alloy, submersion of the core into a molten bath of rare-earth metal or its alloy, extraction of the core from it and hardening of molten rare-earth metal or its alloy on the core surface. A method for obtaining the above evaporative material involves formation of a solidified body from rare-earth metal or its alloy by melting of rare-earth metal or its alloy, submersion of the base made from high-melting metal having thermal capacity per unit volume of at least 2 MJ/Km3 to molten bath of rare-earth metal or its alloy at maintaining the base at the temperature below the fusion temperature of rare-earth metal or its alloy and further extraction of the base with formation on the base surface of solidified body, separation of solidified body from the base and treatment of separated solidified body till plate-like shape.

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13 cl, 10 dwg, 3 ex

FIELD: chemistry.

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FIELD: chemistry.

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3 dwg, 3 ex

FIELD: applied superconductivity.

SUBSTANCE: proposed method that can be used for manufacturing mechanically loaded superconductor windings designed for sustaining conductor stress higher than 100 MPa as well as superconductor windings and devices designed for operation under variable conditions, such as superconducting magnets for charged particle accelerators and superconductor inductive energy storages involves use of liquid epoxy resin as filler doped with finely dispersed powder of rare-earth intermetallide, for instance HoCu2 (holmium-copper) or CeCu2 (cerium-copper). Filler concentration is chosen between 20 and 50% of liquid epoxy resin volume.

EFFECT: enhanced performance characteristics of superconductor windings under variable conditions.

4 cl, 2 dwg

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2 cl, 8 dwg

FIELD: applied superconductivity.

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EFFECT: enlarged functional capabilities.

7 cl, 8 dwg

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14 cl, 8 dwg

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2 cl, 14 dwg

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4 dwg

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EFFECT: reducing response time and providing the possibility of controlling it.

17 cl, 8 dwg

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