JPS58152306A - Electric conductor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Concerning an electrical conductor suitable for carrying a current of a certain frequency.

Conventional, high capacity current or high frequency current? As the electrical conductor for carrying current, a single conductor whose effective area does not increase in proportion to the cross-sectional area due to the skin effect, a single conductor having a large cross-sectional area, or a conductor which can be divided into multiple parts is used. However, in the former case, because the electrical conductor is usually made of a material with relatively low mechanical strength such as high conductivity copper or steel alloy, it is necessary to provide many support points with support insulators, etc. However, the latter method has problems such as the need to provide support to cope with the repulsion generated by the current flowing in four directions.

The present invention was made in view of the above-mentioned problems, and includes copper or about 0.1 to 0.6
By completely burying a plurality of conductive parts extending parallel to each other and separated from each other, the conductive parts containing chromium in the weight percent are more efficient than the total cross-sectional area of a large-capacity current or a high-frequency current. The object of the present invention is to provide an electric conductor that can conduct electricity and increase the junction between the two. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the electrical conductor 1 according to the present invention includes a resistance portion 2 made of ceramic such as alumina, mullite, zircon, steatite, etc., which is linear and formed into a rod shape with a circular cross section. A plurality of through-holes 3 are provided in the body part in the same direction as the longitudinal direction thereof, parallel to each other, and appropriately spaced apart, and each through-hole 3 is filled with tone to form a plurality of current-carrying parts 4. At the same time, a film 5 of chromium oxide such as chromium oxide (crton) having a film thickness of about 0.1μ or more is formed on the inner peripheral surface of each through hole 3 in order to increase the bonding strength between each energizer 114 and the resistor part 2. It is configured.

Therefore, the area occupancy rate of the resistor part 2 is set to be 10 to 90 inches in the cut plane of the electric conductor l perpendicular to the energization direction of each current-carrying part 4, depending on the amount of electricity and mechanical strength. It is being

To manufacture the entire electric conductor 1 having the following configuration, first, a plurality of circular pipes made of ceramic such as alumina or mullite, each having an inner diameter of 0.1 mm or more and an outer diameter of 0.8 mm or more, Use a suitable binding member (for example, a temporary band) to bind the pieces so that they have a circular cross section. Next, apply chrome'! to the entire surface of the bundled pipes (the inner and outer circumferential surfaces of each pipe). ! Deposited to a thickness of 100A' or more, or plated to a thickness of 0.1μ or more, then 10-" Tor
10 at a temperature of 100°C or higher in an air atmosphere of r or higher
Continue heating for more than 1 minute to complete the chromium oxide film.

Then, a bundle of pipes was formed on the entire surface of the chromium oxide coating, with the longitudinal direction facing up and down, and a copper block at the top end. A cylindrical container made of ceramics, etc., is placed in a vacuum atmosphere (vacuum furnace) of 10-4 Torr or less, or in a gas atmosphere such as helium, hydrogen, etc. that does not oxidize steel. Finally, the pipes placed on the copper blocks are heated to a temperature of 1088°C or higher, which is higher than the copper melting void, in the above-mentioned atmosphere to form copper inside each pipe and between adjacent pipes. A desired electrical conductor 1 is completed by infiltrating the through-holes (through-holes) and slowly cooling the bundle of pipes infiltrated into the above-mentioned atmosphere.

In addition, in the above-mentioned manufacturing method, a case was described in which a chromium oxide coating was formed on the entire surface of a bundle of bound ceramic pipes, but this is not limited to this. It is also possible to form a chromium oxide film on the entire surface (surface and outer peripheral surface) in advance, and then form a bundle of pipes.

Friend, in order to form a complete chromium oxide film, it is not limited to the case described above, but for example, the entire surface of an individual pipe or a bundle of pipes must be coated with chromium oxide (for example, Cr10B).
Chromium oxide powder 1 of 1,100 mesh is vapor-deposited to a thickness of 100A' or more, or made into a paste using an appropriate solvent (to form a complete chromium oxide film by applying it to a thickness of 100A' or more) It is also possible to do so.

Furthermore, the pipe made of ceramics is not limited to a circular shape, but may be a polygonal shape such as a triangular, quadrangular, or hexagonal shape.

Here, the state of the joint between the resistance part 2 and the through-it part 4 in the 7tt gas conductor 1 manufactured by the method described above is such that the resistance part 2 is made by bundling a plurality of alumina ceramic pipes,
A chromium film of about 1 μm is formed on the entire surface by full vacuum KM, and about 5
The chromium oxide film was completely formed by heating at a temperature of 00℃ for 10 minutes.
When copper is infiltrated at a temperature of 1083°C or higher in a vacuum atmosphere of orr and slowly cooled in the same atmosphere,
Figure 4.

The grain shape is as shown in the enlarged views (grain boundary diagrams) shown in Figures 5, 6, and 7. In other words, Figure 3 is a secondary electron image taken with an X-ray microanalyzer. The black part on the right is alumina ceramics, the slightly white part on the left is copper, and the wave-shaped part between the two is chromium oxide. It is a thing. Moreover, FIG. 4 is a characteristic X-ray image taken by an X-ray microanalyzer showing the entire dispersion state of chromium, and the white part in the center is chromium.

Furthermore, FIG. 5 is a characteristic Xi image taken by an X-ray microanalyzer showing the dispersed state of oxygen, and the white parts dotted on the right are oxygen. In addition, Figures 6 and 7 are characteristic X-ray images taken by an X-ray microanalyzer that similarly show the dispersion state of aluminum and copper. The white part on the left is copper.

Therefore, the bonding strength between the ceramic and copper of the electric conductor 1 manufactured by the method described above is 5 kl? /yr+yr
It became more than +1.

In addition, according to vapor deposition, the chromium coating on the entire surface of an individual pipe or a bundle of pipes made of ceramics is at least 1.
At 00A', a film with a uniform thickness is formed, and the bond with the copper is also uniform, and the desired bond strength is obtained by diffusion of ROM (both into the ceramic and into the pot), but in the case of plating, a film with a minimum thickness of α1μ is required. It has been confirmed through experiments that a uniform diffusion layer cannot be obtained unless the thickness is increased.

In addition, even when applying 1100 mesh chromium oxide powder in paste form with an appropriate solvent to form a complete chromium oxide film, the desired bonding strength cannot be achieved unless the film is applied to a thickness of αlμ or more. It was also confirmed by experiment that this was not possible.

Furthermore, the oxidation treatment conditions for the chromium film depend on the film thickness;
At the above minimum film thickness (approximately 0.1 μ), under the above conditions (I
LO-' Torr, 100° C., 10 minutes). This is thought to be because chromium has a high affinity for oxygen, so it easily becomes chromium oxide when exposed to a small amount of tl in the air.

FIG. 8 is an enlarged cross-sectional view of the electric conductor according to the second invention, and the gas conductor of the second invention has the above-mentioned electric conductor 1 of the first invention penetrating it in the longitudinal direction and four directions. , a plurality of through holes 3' of the resistor NS2 are provided in parallel with each other and appropriately spaced apart to increase the bonding strength and sound between the resistor part 2 made of ceramics and the energizer 'm4 made of copper.
5 layers of chromium oxide are formed on the inner circumferential surface of the cylinder, while the thickness of approximately α1 to α6 is 1! : % of chromium in the pot sound ceramics by filling each through hole 3 of the resistor part 2 to form a plurality of current-carrying parts? It can be used to form electrical conductors throughout the body.

In order to construct the entire electrical conductor of the second invention, a plurality of pipe tray binding members made of ceramics such as alumina are used to bind the pipe trays so as to have a circular cross section, as in the first invention. Next, this bundle of bundled pipes is placed so that its longitudinal direction is in the vertical direction, and a copper block containing approximately α1 to 06% by weight of chromium is placed on the upper end to form a cylindrical container made of ceramics. etc. through 10""'
It is placed in a vacuum atmosphere of Torr or less (X air furnace) or in a gas atmosphere such as helium, hydrogen, etc. that does not cause tone oxidation.

Finally, the bundle of pipes, etc. is heated in the above atmosphere at a temperature above the melting point of copper (1088°C), and the copper containing a trace amount of chromium is heated. This is done by infiltrating the through-holes formed inside each pipe and between adjacent pipes, and slowly cooling the bundle of pipes in the same atmosphere.

In addition, the above-mentioned 1. In the electric conductor of the second invention, the rod-shaped friends each having a circular cross section have been described in detail, but the shape of the electric conductor is not limited to this.
For example, Figures 9 and 10.

As shown in FIGS. 11 and 12, it may be hollow cylindrical, rectangular, prismatic, or flat. It may also be flat, perpendicular to its surface, and spaced appropriately from each other. A resistor part made of ceramics has a plurality of through holes formed in the resistor part, and a resistor part with a chromium oxide coating formed entirely on the inner peripheral surface. The entire flat electrical conductor may be constructed of a through-hole portion formed by filling copper containing chromium.

Therefore, the round rod shape, rectangular shape, prismatic shape, etc., can be used as bus bars for switchboards and other power equipment that carry large-capacity current, and the four can be used as the center conductor of bushings, terminal conductors, and various connection conductors. A hollow cylindrical conductor can be used as a cooling conductor that allows a cooling medium such as cooling water to flow through the hollow portion, for example, as a conductor for high frequency current. In particular, round rods are suitable as electrical conductors for transmitting operating force and impact force, like the movable electrode rod of a vacuum interrupter. A plate-shaped one having this structure is suitable as an electrode for a vacuum interrupter.

As described above, the present invention has a resistor part made of ceramic having a plurality of through holes spaced parallel to each other and having a chromium oxide coating formed on the inner circumferential surface, and a resistor part made of ceramic having a plurality of through holes, which are spaced apart from each other and having a chromium oxide coating formed on the inner circumferential surface, and a copper resistor part filled in each through hole of the resistor part. Because it is an electrical conductor consisting of multiple current-carrying parts, it can efficiently conduct a larger current or higher frequency current compared to its cross-sectional area than conventional ones! In addition, the resistance part made of ceramics and the current carrying part made of copper can be strongly bonded through the all-chromium oxide bond, resulting in excellent mechanical strength.

In addition, the plurality of through-holes spaced parallel to each other are generally made of a resistor made of the following ceramics, and each through-hole of the resistor is filled with a plurality of resistors made of copper containing chromium of 0.1 to α6 weight i:2. Since it is an electrical conductor consisting of a current-carrying portion, it has the same effects as those of the first invention described above, as well as the ability to easily construct the casing.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the electric conductor according to the first invention, FIG. 2 is an enlarged cross-sectional view thereof, and FIG. 8, FIG. 4, FIG. 5, FIG. 6, and FIG. FIG. 8 is an enlarged cross-sectional view of the electrical conductor according to the second invention, FIG. 9, FIG. 1O,
FIGS. 11 and 12 are perspective views of other embodiments of the present invention, respectively. DESCRIPTION OF SYMBOLS 1... Electric conductor, 2... Resistance part, 8... Through hole,
4... Current-carrying part, 5... Coating. Figure 11 Figure 12 Procedural amendment (voluntary) 1. Indication of the case 1982 Patent Application No. 34988 2. Name of the invention Electric conductor 3. Person making the amendment Relationship to the case Applicant (810) Akira Co., Ltd. Densha 4, Agent: 1-29 Akashi-cho, Chuo-ku, Tokyo 104 Column for detailed description of the invention of Suiseikai Hill Specification. Contents of gender correction Clear measurement view M8 page N2 line to I! On page 8, line 18, “
Figures 5 and 6...(omitted)...Does it say "dispersion of copper"? , [The characteristics are as shown in the characteristic photographs shown in FIGS. 5, 6, and 7. In other words, the characteristic photograph in Figure 8 is a secondary electron image taken with an X-ray microanalyzer, where the black part on the right is alumina ceramics, the slightly white part on the left is copper, and the wave-shaped part interposed between the two. is chromium oxide. Also, is the characteristic photo in Figure 4 a dispersion state of chromium?
In the characteristic X-ray image taken by an X-ray microanalyzer, the white part in the center is covered with chrome. Furthermore, the characteristic photograph in FIG. 5 is a characteristic X-ray image taken by an X-ray microanalyzer that shows the dispersed state of oxygen, and the white parts dotted on the right are oxygen. Man, #! The characteristic photographs in FIGS. 8 and 7 are similarly corrected to be "dispersion of aluminum and copper." Procedural amendment (method) 1. Display of the case 1984 Patent Application No. 84988 2, Name of the invention Electrical conductor 3, Person making the amendment Relationship to the case Applicant (610) Meiden Co., Ltd. ★ 4, Agent 104 Akashi-cho, Chuo-ku, Tokyo No. 1 29, Suiseikai Building, June 29, 1980 a. Column for a brief explanation of the drawings of the details subject to amendment. 7 Contents of the amendment El) 1 Does it say "the relevant electric conductor...(omitted)...the electric conductor" from line 12 on page 15 of the Life Insurance Tatami to line 13 on page 15 of the same? , "Characteristics taken by an X-ray microanalyzer of the junction between the resistive part and the current-carrying part of such an electric conductor X1 Figure 8 shows N2
amended to read "of the electrical conductor according to the invention". that's all

Claims (2)

[Claims] (1) A resistor part made of ceramic having a plurality of through holes spaced parallel to each other and formed on the # film of chromium oxide on the inner circumferential surface, and a plurality of resistors made of copper filled in each through hole of the resistor part. An electrical conductor that exits from a current-carrying part. (2) A resistor part made of ceramics with a plurality of through holes spaced parallel to each other, and a plurality of resistor parts made of copper containing approximately 0.1 to 0.6% by weight of chromium filled in each through hole of the resistor part. An electrical conductor consisting of a current-carrying part.