CN104376919B - A kind of preparation method of magnesium oxide insulated hollow composite cable - Google Patents
A kind of preparation method of magnesium oxide insulated hollow composite cable Download PDFInfo
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- CN104376919B CN104376919B CN201410582553.2A CN201410582553A CN104376919B CN 104376919 B CN104376919 B CN 104376919B CN 201410582553 A CN201410582553 A CN 201410582553A CN 104376919 B CN104376919 B CN 104376919B
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Abstract
The invention belongs to a kind of cable preparation method, be specifically related to the preparation method of a kind of magnesium oxide insulated hollow composite cable being applied to tokamak fusion assay device.It is by designing its jacket dimensions, uses the deformation technologies such as vacuum assembling, isostatic pressing technology, electron beam welding, extruding, drawing, controls the relative change rate between its each layer, it is thus achieved that the high performance cable of different size specification.It is an advantage of the invention that, through the magnesium oxide insulated hollow composite cable being made up of stainless steel oxidation magnesium hollow copper prepared by the present invention, owing to improve the density of magnesium oxide layer and solving the sucting wet problem of magnesium oxide in preparation technology, therefore the insulating properties of composite cable are improved.
Description
Technical field
The invention belongs to a kind of cable preparation method, be specifically related to one and be applied to tokamak fusion assay
The preparation method of the magnesium oxide insulated hollow composite cable of device.
Background technology
In order to suppress the unstability of plasma, realize various tokamak fusion assay function, as
Need to arrange multiple Inside coil in the vacuum chamber of the core component of tokamak fusion assay device, including
Shielded coil in the various diagnosis coils, high-intensity magnetic field of plasma, edge local mode and vertical the most not
Stability coil, divertor alihnment coil, TBM Active Compensation coil etc..Due to these Inside coils
All will face the strong radiation environment (neutron irradiation and radiated by gamma-ray) of fusion reaction, operating temperature is higher
(more than 300 degree), therefore can not use the common insulant such as epoxy resin and glass fibre to realize line
Electric insulation within Quan.
International Thermal-Nuclear Experimental Reactor (ITER) mainly uses a kind of mineral insulation hollow cable (MIC) at present
As internal vacuum chamber coil piece, this mineral insulation hollow cable is three-decker: oxygen-free copper or zirconium chromium
The hollow copper pipe of copper, magnesium oxide insulated layer and rustless steel or the armor of nickel alloy.In the world about this by
The preparation of the composite cable that rustless steel-magnesium oxide-hollow copper pipe is constituted generally uses interpolation binder method to mold
Make insulating oxide magnesium idiosome technology and roller die, drawing deformation technology.Add binding agent can not effectively carry
The purity of its magnesium oxide layer high, and enhance the moisture-absorption characteristics of magnesium oxide, thus reduce magnesium oxide layer
Insulating properties；In roller die extruding and drawing process, deflection is few, and passage is many, and power consumption is big, the most not
The consistency of magnesium oxide layer can be effectively improved, reduce its insulating properties.
Therefore, we have proposed the preparation technology of a kind of new magnesium oxide insulated hollow composite cable, mainly
It is to solve the easy moisture absorption of magnesium oxide in existing preparation technology and magnesium oxide density problem on the low side.Should
There are outside three layers of realization compound, that inner hollow core composite cable processes technology of preparing, to this kind of insulation
The special applications of cable and popularization will be significant.
Summary of the invention
It is an object of the invention to provide the preparation method of a kind of magnesium oxide insulated hollow composite cable, it passes through
Isostatic pressing technology and vacuum assemble, and become three-decker by compound to stainless steel layer, magnesium oxide layer and hollow copper
Relatively stable, the compound idiosome of size uniform；By using extruding, drawing process to realize in compound idiosome
Insulating barrier densification.
The present invention is achieved in that the preparation method of a kind of magnesium oxide insulated hollow composite cable, its bag
Include following steps,
(1) three layers of Hollow Compound idiosome size are obtained according to three layers of compound idiosome thickness and deformation processing rate；
(2) rustless steel jacket being included, the upper and lower end cap of stainless steel outer sleeve, rustless steel and hollow copper pipe are by acid
Wash, wash drying；
(3) isostatic pressing process is used, by high-purity magnesium oxide powder direct combination to stainless steel outer sleeve and hollow copper
Inside put, form the first idiosome of hollow composite cable；
(4) using vacuum packaging technology, evacuation assembles, and uses electron beam to weld, and is sealed against weldering
Connect, make the idiosome becoming hollow composite cable；
(5) compound idiosome is deformed through extrusion ratio 2～12 row large scale at 800～1000 DEG C, improve internal
Magnesium oxide layer density, it is achieved in, inside and outside layer homogeneous deformation, it is thus achieved that the extruding secondary of hollow composite cable
Idiosome；
(6) to obtain the hollow of demand size after drawing elongation for several times, shaping compound for extruding secondary idiosome
Cable product.
It is an advantage of the invention that through the oxygen being made up of rustless steel-magnesium oxide-hollow copper prepared by the present invention
Change magnesium insulation hollow composite cable, owing to improve the density of magnesium oxide layer and solving oxygen in preparation technology
Changing the sucting wet problem of magnesium, therefore the insulating properties of composite cable are improved, it is possible to realize following target
Parameter: the realized dimensional parameters of hollow composite cable is as follows: center bore >=10mm；Central copper thickness
≥5mm；High-purity magnesium oxide thickness of insulating layer >=1.5mm；Stainless steel layer thickness >=3mm；Hollow is combined
The magnesium oxide layer insulating properties of cable are as follows: during direct current 2500V DC, magnesium oxide layer electricity thick for 2.5mm
Resistance > 100G Ω；In 3000V AC ac test, it is ensured that the most breakdown in 1min；Hollow is combined
The magnesium oxide layer purity more than 99% of cable, density is at 2.7g/cm3Above.
Accompanying drawing explanation
Fig. 1 is the preparation method flow chart of a kind of magnesium oxide insulated hollow composite cable；
Fig. 2 is composite cable jacket schematic diagram.
In figure, 1 cylindrical steel dummy block, 2 end plate bottoms, 3 rustless steel jackets, 4 end plate top covers, 5 bronze medals
Pipe, 6 mineral insulation, 7 jackets weld at sealing-in with the electron beam of end plate bottom, 8 end plate bottom and steel
At the electron beam welding sealing-in of dummy block.
Detailed description of the invention
With embodiment, the present invention is described in detail below in conjunction with the accompanying drawings:
As it is shown in figure 1, the preparation method of a kind of magnesium oxide insulated hollow composite cable, comprise the steps:
(1) first three layers of Hollow Compound idiosome chi are obtained according to three layers of compound idiosome thickness and deformation processing rate
Very little；
(2) rustless steel jacket being included, the upper and lower end cap of stainless steel outer sleeve, rustless steel and hollow copper pipe are by acid
Wash, wash drying；
(3) isostatic pressing process is used, by high-purity magnesium oxide powder direct combination to stainless steel outer sleeve and hollow copper
Inside put (120～300MPa), form the first idiosome of hollow composite cable；
(4) using vacuum packaging technology, evacuation assembles, and uses electron beam welding (10～200mA
Welding current) it is sealed against welding, make the idiosome becoming hollow composite cable；
(5) by compound idiosome at 800～1000 DEG C through extrusion ratio 2～12 (the idiosome area ratio before and after extruding)
Carry out large scale deformation, improve internal oxidation magnesium layer density, it is achieved in, inside and outside layer homogeneous deformation, obtain
Obtain the extruding secondary idiosome of hollow composite cable；
(6) to obtain the hollow of demand size after drawing elongation for several times, shaping compound for extruding secondary idiosome
Cable product.
Embodiment:
A kind of preparation process of the magnesium oxide insulated hollow composite cable of outside dimension 45mm:
1, select material: this technology of preparing use for 316L rustless steel, high-purity magnesium oxide powder
(> 99%), OFHC high-purity oxygen-free copper material is as raw material；
2, according to Design and Machining ratio extrusion ratio 8 (sample in cross section area ratio before and after extruding) He Gebu
Divide processing drawing, process each several part parts, make stainless steel outer sleeve, hollow copper sheathing, two ends end cap, as
Shown in Figure of description 2；
3, isostatic pressed 170MPa is used to be combined by magnesia powder to stainless steel outer sleeve, hollow copper sheathing,
Guarantee three layers the most stable, it is thus achieved that compound idiosome；
4, compound idiosome is obtained by 3 through vacuum electron beam welding 100mA welding current soldering and sealing, it is thus achieved that
The constitutionally stable three layers of compound idiosome Hollow Compound idiosome of 120mm (external diameter be)；
5, at 950 DEG C, during extrusion speed 150mm/s, when extrusion ratio is 8, it is thus achieved that idiosome after extruding
The Hollow Compound body of 46mm (external diameter be)
6, through drawing, aligning and surface process, it is thus achieved that composite cable a diameter of (external diameter 45mm,
Internal diameter is the Hollow Compound cable of 10mm)
7, measured: rustless steel external diameter 45mm, thickness is 3.5mm；Magnesium oxide layer external diameter is
38mm, thickness is 2.5mm；Layers of copper diameter 33mm, thickness is 11.5mm, and center bore is 10mm；
Magnesium oxide layer density is 2.75g/cm3；Through test: it can be at 2500VDC, up to 105G Ω
Resistance；In ac voltage withstanding is tested, it is possible to the most breakdown at the 3000VAC 1min that works continuously.
Claims (2)
1. the preparation method of a magnesium oxide insulated hollow composite cable, it is characterised in that: it includes as follows
Step,
(1) obtain three layers of hollow according to three layers of compound idiosome thickness and deformation processing rate and be combined idiosome size；
(2) rustless steel jacket is included, and the upper and lower end cap of stainless steel outer sleeve, rustless steel and hollow copper inner sleeve are passed through
Pickling, washing are dried；
(3) isostatic pressing process is used, by high-purity magnesium oxide powder direct combination to stainless steel outer sleeve and hollow copper
Inside put, form the first idiosome of hollow composite cable；
(4) using vacuum packaging technology, evacuation assembles, and uses electron beam to weld, and is sealed against weldering
Connect, make the idiosome becoming hollow composite cable；
(5) compound idiosome is carried out large scale deformation at 800～1000 DEG C through extrusion ratio 2～12, in improving
Portion's magnesium oxide layer density, it is achieved in, inside and outside layer homogeneous deformation, it is thus achieved that the extruding two of hollow composite cable
Secondary idiosome；
(6) to obtain the hollow of demand size after repeatedly drawing elongation, shaping compound for extruding secondary idiosome
Cable product.
The preparation method of a kind of magnesium oxide insulated hollow composite cable the most as claimed in claim 1, it is special
Levy and be: the described force value in step (3) is 120～300MPa.
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| CN201410582553.2A CN104376919B (en) | 2014-10-27 | 2014-10-27 | A kind of preparation method of magnesium oxide insulated hollow composite cable |
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| CN201410582553.2A CN104376919B (en) | 2014-10-27 | 2014-10-27 | A kind of preparation method of magnesium oxide insulated hollow composite cable |
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| CN104376919A CN104376919A (en) | 2015-02-25 |
| CN104376919B true CN104376919B (en) | 2016-08-31 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109883622A (en) * | 2019-01-18 | 2019-06-14 | 中国科学院合肥物质科学研究院 | Coil air-tightness detection method made of a kind of multi-layer compound structure conductor |
| CN112180423A (en) * | 2019-07-04 | 2021-01-05 | 核工业西南物理研究院 | Magnetic confinement nuclear fusion gamma ray detector with Compton inhibition function |
| CN114799752B (en) * | 2022-04-26 | 2023-04-28 | 核工业西南物理研究院 | Manufacturing method of water collecting pipe in vacuum chamber of tokamak device |
| CN114914019B (en) * | 2022-05-20 | 2024-05-07 | 宝鸡拓普达钛业有限公司 | Preparation method of insulating hollow composite cable conduit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102110495A (en) * | 2010-12-10 | 2011-06-29 | 久盛电气股份有限公司 | High-temperature resistant and radiation-resistant inorganic insulating hollow cable as well as manufacturing method and mold thereof |
| CN103021577A (en) * | 2011-09-27 | 2013-04-03 | 中国电子科技集团公司第二十三研究所 | Implementation method of mineral insulated coaxial cable |
| CN103813497A (en) * | 2012-11-06 | 2014-05-21 | 杰宜斯科技有限公司 | Cable for high temperature and heat treatment device using the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8136236B2 (en) * | 2009-09-15 | 2012-03-20 | John Mezzalingua Associates, Inc. | Method for manufacturing a coaxial cable |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102110495A (en) * | 2010-12-10 | 2011-06-29 | 久盛电气股份有限公司 | High-temperature resistant and radiation-resistant inorganic insulating hollow cable as well as manufacturing method and mold thereof |
| CN103021577A (en) * | 2011-09-27 | 2013-04-03 | 中国电子科技集团公司第二十三研究所 | Implementation method of mineral insulated coaxial cable |
| CN103813497A (en) * | 2012-11-06 | 2014-05-21 | 杰宜斯科技有限公司 | Cable for high temperature and heat treatment device using the same |
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