JP3249843B2 - Fusion reactor wires - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire for a fusion reactor in which an insulating layer is coated around a conductor, and more particularly, to a high temperature in a fusion reactor.
The present invention relates to an electric wire for a fusion reactor that can be used in a severe environment with a high radiation dose.

[0002]

2. Description of the Related Art Fusion energy is considered to be an excellent energy source in terms of resources, environment and safety.
The United States and Europe have cooperated internationally toward the realization of nuclear fusion reactors, and their technological development is progressing steadily.

[0003]

Incidentally, the fusion reactor has a severe environment as compared with the conventional light water reactor, and is, for example, a place exposed to a high temperature of 1000 ° C. or more and a high radiation dose of 100 MGy or more. There is.

[0004] However, an electric wire for a fusion reactor having ultra-high heat resistance and radiation resistance enough to withstand use in such a severe environment has not been created yet.

In view of the above problems, an object of the present invention is to provide a high temperature,
An object of the present invention is to provide an electric wire for a nuclear fusion reactor having extremely high heat resistance and radiation resistance that can withstand use in a severe environment with a high radiation dose.

[0006]

According to the electric wire for a fusion reactor of the present invention, a high temperature of 1000 ° C. or more and a temperature of 100 MGy or less are used.
In the fusion reactor wires exposed to the above high radiation dose,
Polycarbosilane or polysilazane ceramics
Precursor polymer fiberized in an inert gas atmosphere
In the cloth oxygen content which is formed by subjecting the infusibilized by irradiation with ionizing radiation is composed of Si-N-O based fiber is 0.1 to 2.0% as a base material, the weave pattern of the cross An insulating layer made of an inorganic insulating material filled with a coating agent mainly composed of a ceramic precursor polymer is made of tungsten,
Molybdenum or platinum
After firing in a gas with nitriding action
Thus, the above object can be achieved.

[0007]

The Si-NO-based fiber referred to in the present invention is a polycarbosilane or polysilazane ceramic precursor.
After lima fiberized, infused with ionizing radiation at a dose of 6 to 10 MGy in an inert gas atmosphere to make it infusible ,
It is obtained by firing at a temperature of 700 to 1200 ° C. in a gas having a nitriding action.

[0008] Table 1 shows the chemical structures and number average molecular weights of polycarbosilane and polysilazane.

[0009]

[Table 1]

[0010] The oxygen content of the Si-NO-based fiber is specified to be 0.1 to 2.0 wt%, because if it is less than 0.1 wt%, the flexibility of the fiber and cloth is inferior.
On the other hand, if it exceeds 2.0 wt%, high-temperature electrical properties, especially volume resistivity, decrease.

Although not particularly specified, the fiber diameter is 10 to 20 μm.
m is desirable. Further, as the weaving method of the cloth, all the manufacturing methods used for glass cloth such as plain weave and twill weave can be applied. The weaving density is
The finer the eyes, the more effective.

[0012] The ionizing radiation for infusibilizing the Si-NO-based fibers includes charged and neutral particles of any one of an electron beam, a proton beam, an α-ray and a neutron beam, and further includes γ-rays.
It is selected from X-ray electromagnetic waves.

Meanwhile, as the ceramic precursor polymer to pack eye cross, made by high temperature calcination in air or an inert gas inorganic silicones consisting SiO ₂ based ceramics, Porisesukisan, the Al ₂ O ₃ based ceramics Poriarumino Siloxane, polyborazine which becomes BN-based ceramic, S
Polycarbosilane, polytitanocarbosilane, polymetacarbosilane such as polyborosiloxane, polysilastyrene, nitrogen or ammonia, which becomes i-NO-based ceramics, or Si-N by high-temperature baking in an inert gas.
There is polysilazane or the like that becomes -O-based ceramics. These ceramic precursors are diluted with a solvent such as xylene or toluene and used as a coating agent. At this time,
An inorganic filler can be added to this. As the inorganic filler, alumina, magnesia, mica, talc,
Silica, zirconia, wollastonite, zeolite,
Examples include clay, boron nitride, aluminum nitride, and silicon nitride.

[0014] The clogging is performed by coating the above-mentioned coating agent on a tape-like cloth and winding it on a conductor in a prepreg state and then baking it, or winding the tape-like cloth on a conductor and then varnish-like ceramic precursor. And then firing. This firing is mainly performed in the electric wire manufacturing process. However, depending on the use environment of the electric wire, the electric wire can be laid unfired and fired at the time of use.

As other methods, a method of vertically attaching tapes, braiding, or the like may be used, or these may be used in combination.

Further, in the fusion reactor electric wire according to the present invention, a wound layer of mica tape may be provided around the conductor as an auxiliary insulator. In addition, the outermost layer
As the layer, a braid made of Si-NO-fiber, SiC fiber, alumina fiber, silica fiber, glass fiber, or the like can be applied, or an exterior such as stainless steel can be provided.

Furthermore, as the conductive wire for use in the present invention, tungsten wire, molybdenum wire, or platinum wire mentioned <br/> is Ru.

Further, a pipe through which the refrigerant passes may be provided inside or outside the conductor.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the electric wire for a fusion reactor according to the present invention will be described below in detail with reference to the accompanying drawings and tables.

The electric wire for a fusion reactor of Example 1 is manufactured as follows.

[0021] A coating agent consisting of xylene 60 parts by dip coating, and cured for 30 minutes at a temperature 200 ° C. in air, the thickness of 0. A 2 mm prepreg tape was obtained. Next, as shown in FIG.
The conductive wire 1 made of a stranded tungsten wire having a cross-sectional area of mm ² was wound around an insulating thickness of about 1 mm, and a braid of 0.4 mm thick made of Si-NO-based fibers was further applied. Thereafter, nitriding treatment was performed in an ammonia gas stream at 700 ° C. to transform polycarbosilane into Si—N—O-based ceramics to complete clogging, and an insulating layer 2 was coated around the conductor 1. The outermost layer 3 was provided with a stainless steel corrugated exterior.

The electric wire for a nuclear fusion reactor of Example 2 is manufactured as follows.

A fusion reactor electric wire was prepared in the same manner as in Example 1 except that the oxygen content of the Si-NO-based fibers used in Example 1 was changed from 0.1 wt% to 1.0 wt%. Produced.

Further, the electric wire for a fusion reactor of Example 3 is manufactured as follows.

The polycarbosilane of Example 1 was Other than that, the electric wire for fusion reactors was produced like Example 1.

Next, a comparative example performed to confirm the effects of the first to third embodiments will be described.

The fusion reactor electric wire of Comparative Example 1 is manufactured as follows.

[0028] The oxygen content of the Si-NO-based fiber used in Example 1 was changed from 0.1 wt% to 0.05 wt%.
Other than that, the electric wire for fusion reactors was produced like Example 1.

The electric wire for a fusion reactor of Comparative Example 2 is manufactured as follows.

The fusion reactor electric wire was manufactured in the same manner as in Example 3 except that the oxygen content of the Si-NO-based fiber used in Example 3 was changed from 0.1 wt% to 3.0 wt%. Produced.

The characteristics of the electric wires for fusion reactors of the examples and comparative examples obtained as described above were evaluated. Table 2 shows the evaluation results.

The flexibility of the cloth made of Si-NO-based fibers was judged from the ease with which the wound insulating layer 2 was wrinkled. In this case, there is a tendency that wrinkles are more likely to occur as the material lacks flexibility.

In addition, evaluation of heat resistance and radiation resistance
Judgment was made from the volume resistivity ρ of the electric wire before and after the composite deterioration of radiation. The measurement of the volume resistivity ρ was obtained by applying a DC current of 1000 V for 1 minute between the conducting wire 1 and the stainless steel corrugated sheath of the outermost layer 3.

[0034] Further, the composite deterioration of heat and radiation, ⁶⁰ Co
After irradiating γ-rays with a radiation dose of 100 MGy,
Performed by exposure to a temperature of 1000 ° C. for 1000 days.

[0035]

[Table 2]

As is apparent from Table 2, Examples 1 to 3 according to the present invention all show excellent heat resistance and radiation resistance. However, the oxygen content in the fiber is 0.05 wt%
In Comparative Example 1, where the electrical characteristics were good,
Since the cloth made of -NO-based fibers lacks flexibility, processability is insufficient. In addition, the oxygen content is 3.0
In Comparative Example 2 which is wt%, although the processability is good,
The volume resistivity ρ at a temperature of 1000 ° C. after the composite deterioration significantly decreases.

As is clear from the above results, the present invention relates to a polycarbosilane or polysilazane ceramic.
Fiber precursor polymer into an inert gas atmosphere
Irradiation in the air to form infusibilizing treatment
Si-N- having an oxygen content of 0.1 to 2.0 wt%
The insulating layer 2 made of an inorganic insulating material , in which a cloth made of an O-based fiber is used as a base material and the weave of the cloth is filled with a coating agent mainly composed of a ceramic precursor polymer ,
Around the conductor 1 composed of ten, molybdenum, or platinum
The present invention relates to a fusion reactor electric wire coated with
By finding the optimal value of the oxygen content in i-NO fiber, it has practically sufficient characteristics even under the severe environment of a fusion reactor , and has super heat resistance and radiation resistance. Ri Do a wire for nuclear fusion reactor having its industrial value is extremely high.

Although the term "electric wire" has been used in the above description, it goes without saying that the concept includes all transmission lines such as cables and wires.

[0039]

As described above, according to the electric wire for a fusion reactor according to the present invention, it has extremely high heat resistance and radiation resistance, a high temperature of 1000 ° C. or more, and a high radiation dose of 100 MGy or more. It has an excellent effect that it can be used even in severe environments.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a fusion reactor electric wire according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conductor 2 Insulation layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI H01B 17/60 H01B 7/34 A (72) Inventor Eisuke Tada 1-801, Mukoyama, Nakamachi, Naka-gun, Ibaraki Pref. In the laboratory (72) Inventor Tadao Seguchi 1233 Watanukicho, Takasaki City, Gunma Prefecture Japan Atomic Energy Research Institute Takasaki Laboratory (72) Inventor Noboru Kasai 1233 Watanukicho, Takasaki City, Gunma Prefecture Japan Atomic Energy Research Institute Takasaki Laboratory (72 Inventor Kazuo Funabashi 2-585 Nemoto, Mito-shi, Ibaraki Pref.Sekidenko Ibaraki Branch (72) Inventor Hideo Itagaki 2-585 Nemoto, Mito-shi Mito-shi Ibaraki Pref.Sekidenko Ibaraki Branch (72) Invention ▲ Yoshi ▼ Shunichi Murata 4-83, Shibaura, Minato-ku, Tokyo Inside the Kandenko Co., Ltd. (72) Inventor Kiyoshi Watanabe 5-1-1, Hidakacho, Hitachi City, Hitachi, Ibaraki, Japan (72) Inventor Seiji Kamimura 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture In-house Power System Laboratory (72) Inventor Hideki Yagyu Hidaka-cho, Hitachi City, Ibaraki Prefecture 5-1-1, Nippon Electric Cable Co., Ltd. Power System Laboratory (56) References JP-A-4-147518 (JP, A) JP-A-61-12915 (JP, A) (58) Fields studied (Int .Cl. ⁷ , DB name) H01B ^7/ 00-7/02 H01B ^7/ 30-7/36 H01B 7/28 C01B 21/082 C01B 31/36

Claims (1)

(57) [Claims] 1. High temperature of 1000 ° C. or more, 100 MGy or less
In the fusion reactor wires exposed to the above high radiation dose,
Polycarbosilane or polysilazane ceramics
Precursor polymer fiberized in an inert gas atmosphere
In the cloth oxygen content which is formed by subjecting the infusibilized by irradiation with ionizing radiation is composed of Si-N-O based fiber is 0.1 to 2.0% as a base material, the weave pattern of the cross An insulating layer made of an inorganic insulating material filled with a coating agent mainly composed of a ceramic precursor polymer is made of tungsten,
Molybdenum or platinum
And then firing in a gas having a nitriding action .