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A kind of preparation method of magnesium oxide insulated hollow core composite cable

A composite cable and magnesium oxide technology, which is applied in the direction of cable/conductor manufacturing, conductor/cable insulation, circuit, etc., can solve the problems of lowering insulation performance, inability to effectively improve the density of magnesium oxide layer, and easy moisture absorption of magnesium oxide, etc., to achieve Effect of improving insulation performance

Active Publication Date: 2016-08-31
SOUTHWESTERN INST OF PHYSICS +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding a binder cannot effectively improve the purity of the magnesium oxide layer, and strengthen the moisture absorption characteristics of the magnesium oxide layer, thereby reducing the insulation performance of the magnesium oxide layer; during the extrusion and drawing process of the roll die, the deformation is very small, and the number of passes Many, high energy consumption, at the same time can not effectively improve the density of the magnesium oxide layer, reduce its insulation performance
[0004] Therefore, we proposed a new preparation process of magnesium oxide insulated hollow core composite cable, mainly to solve the problems of easy moisture absorption and low density of magnesium oxide in the existing preparation process

Method used

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  • A kind of preparation method of magnesium oxide insulated hollow core composite cable
  • A kind of preparation method of magnesium oxide insulated hollow core composite cable

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preparation example Construction

[0018] Such as figure 1 Shown, a kind of preparation method of magnesium oxide insulated hollow-core composite cable comprises the steps:

[0019] (1) First obtain the three-layer hollow composite embryo body size according to the thickness of the three-layer composite embryo body and the deformation processing rate;

[0020] (2) The stainless steel sheath including the stainless steel jacket, stainless steel upper and lower end caps and hollow copper tubes is pickled, washed and dried;

[0021] (3) Using the isostatic pressing process, the high-purity magnesium oxide powder is directly compounded on the stainless steel outer sheath and the hollow copper inner sheath (120-300MPa) to form the primary body of the hollow-core composite cable;

[0022] (4) Adopt vacuum assembly process, vacuumize the assembly, and use electron beam welding (10-200mA welding current) to seal and weld it to make the blank body of the hollow-core composite cable;

[0023] (5) The composite embryo b...

Embodiment

[0026] A preparation process of a magnesium oxide insulated hollow-core composite cable with an outer dimension of 45 mm:

[0027] 1. Select materials: 316L stainless steel, high-purity magnesium oxide powder (>99%) and OFHC high-purity oxygen-free copper are used as raw materials in this preparation technology;

[0028] 2. According to the design and processing ratio of extrusion ratio 8 (the ratio of the cross-sectional area of ​​the sample before and after extrusion) and the processing drawings of each part, process each part, make stainless steel jacket, hollow copper sleeve, and end caps at both ends, as attached to the instruction manual figure 2 shown;

[0029] 3. Use isostatic pressure of 170MPa to compound magnesium oxide powder into the stainless steel jacket and hollow copper jacket to ensure that the three layers are relatively stable and obtain a composite embryo body;

[0030] 4. The composite embryo body obtained in 3 is sealed and welded by vacuum electron be...

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Abstract

The invention belongs to a method for manufacturing cables, in particular to a method for manufacturing a magnesium oxide insulated hollow-core composite cable applied to a Tokamak fusion experimental device. According to the method for manufacturing the magnesium oxide insulated hollow-core composite cable, the rate of relative change between all layers of the cable is controlled by designing the dimension of a sheath and adopting the vacuum assembling and isostatic pressing technology, the electron beam welding technology and the deformation technologies such as the squeezing technology and the pulling technology, and then high-performance cables in different dimensions are obtained. The method for manufacturing the magnesium oxide insulated hollow-core composite cable has the advantages that the insulating property of the magnesium oxide insulated hollow-core composite cable manufactured with the method and composed of stainless steel, magnesium oxide and hollow-core copper is improved due to the fact that the density of a magnesium oxide layer is improved and the problem of moisture absorption of magnesium oxide in a traditional manufacturing technology is solved.

Description

technical field [0001] The invention belongs to a cable preparation method, in particular to a preparation method of a magnesium oxide insulated hollow-core composite cable applied to a tokamak fusion experiment device. Background technique [0002] In order to suppress the instability of the plasma and realize various tokamak fusion experimental functions, a variety of internal coils need to be installed in the vacuum chamber as the core component of the tokamak fusion experimental device, including various diagnostic coils facing the plasma, strong Shielding coils in magnetic fields, fringe localized mode and vertical instability coils, divertor trimming coils, TBM active compensation coils, etc. Because these internal coils will face the strong irradiation environment of fusion reaction (neutron irradiation and gamma ray irradiation), the working temperature is relatively high (above 300 degrees), so ordinary insulating materials such as epoxy resin and glass fiber cannot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B13/14
Inventor 罗天勇朱思华杨凯杜社军江嘉铭
Owner SOUTHWESTERN INST OF PHYSICS