JP2001023482A - Contact material for vacuum valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably improve both of a cutoff characteristic and conductivity by comprising a conductive constituent, an arc resistant constituent, and an auxiliary constituent added as necessary and using several kinds of arc resistant materials different in trace element content. SOLUTION: An arc resistant constituent used for a vacuum valve contact material principally consists of Cr comprising two kinds of Cr: Cr produced by an electrolytic process and Cr produced by a thermite process. The arc resistant constituent contains two or more kinds of trace elements consisting of at least one among Fe, Al, Si, C and either/both of Al and Si, and the trace element content varies by 5-1000 times. Cr as a principal constituent of the arc resistant constituent comprises both of Cr grain containing Al and Cr grain containing no Al and both of Cr grain containing Si and Cr grain containing no Si.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum valve used for a vacuum circuit breaker or the like for interrupting and conducting a current in a vacuum, and more particularly to a contact material for a vacuum valve for forming a contact for interrupting and conducting the current. .

[0002]

2. Description of the Related Art Conventionally, characteristics required for a contact material of a vacuum valve include three basic requirements represented by performances such as a breaking characteristic, a welding resistance characteristic, and a withstand voltage characteristic. It is an important requirement that the contact resistance) and the temperature rise are low and stable.

[0003] However, since some of these requirements are contradictory, it is impossible to satisfy all the requirements with a single metal species. For this reason, in many contact materials that have been put into practical use, two or more types of elements that can mutually compensate for the insufficient performance, such as a combination of a conductive component and an arc-resistant component, such as for a large current or a high voltage. Contact materials suitable for specific applications have been developed, and materials having excellent properties have been developed. It goes without saying that current can be opened and closed with a high probability from the purpose of use as a switch.

[0004]

In order to improve the shut-off characteristics of such a vacuum valve, it is necessary to control a trace component such as Al in the contact material. Specifying is a known technique.

[0005] However, if a small amount of Al or the like in the contact material is added in the form of Al powder as in the prior art, the surface of the Al powder is easily oxidized, and segregation is liable to occur due to the small amount. For this reason, there is a problem that the performance as a contact material is not stable.

Further, there is a problem that the conductivity is extremely lowered by the addition of Al.

As described above, in the case of a contact material in which the composition of only the conductive component and the arc-resistant component (and, if necessary, the auxiliary component) is controlled and a conventional contact material in which a trace element is simply added, stable breaking characteristics can be obtained. There is a problem that it is difficult, and furthermore, it is difficult to improve the blocking characteristics without lowering the conductivity.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide, among the characteristics required for a contact material of a vacuum valve used in a vacuum circuit breaker or the like, a breaking characteristic. And to provide a contact material for a vacuum valve that can stably improve both the conductivity and the conductivity.

[0009]

In order to achieve the above object, a feature of the invention of claim 1 is that the contacts of a vacuum valve for interrupting and conducting current by opening and closing the contacts in a vacuum. The contact material for a vacuum valve to be formed is composed of a conductive component, an arc-resistant component and an auxiliary component added as needed, and two or more types of the anti-arc component having different trace element contents in the material of the arc-resistant component. It is to produce by using arc raw material.

The content of the trace element in two or more kinds of the arc-resistant materials of the arc-resistant component according to the invention of claim 2 is 5 to 1000 times.
Times different.

According to the third aspect of the present invention, the trace elements having different contents of the arc resistant component in the raw material are at least one or more of Fe, Al, Si, and C.

According to a fourth aspect of the present invention, the arc resistant component contains Cr as a main component.

According to a fifth aspect of the present invention, there are two kinds of raw materials of Cr, which are the main components of the arc resistant component, of Cr produced by an electrolytic method and Cr produced by a thermite method.

The trace elements having different contents of Cr, which is the main component of the arc resistant component according to the sixth aspect of the present invention, are at least one of Al and Si.

[0015] A feature of the invention of claim 7 is that both Cr particles containing Al and Cr particles not containing Al are present in the raw material of Cr which is the main component of the arc resistant component. A feature of the invention of claim 8 resides in that in the raw material of Cr which is the main component of the arc resistant component, both Cr particles containing Si and Cr particles not containing Si exist. The trace component having a different content of the arc resistant component in the raw material according to the invention of claim 9 has Al of 10 ppm to 1000 ppm,
Si is 50 ppm to 2000 ppm.

The contact material according to the tenth aspect of the present invention is manufactured by a sintering infiltration method, a solid phase sintering method or a melting method.

The atmosphere during sintering or melting when the contact material of the invention of claim 11 is manufactured by a sintering infiltration method, a solid phase sintering method or a melting method is a non-oxidizing atmosphere.

The non-oxidizing atmosphere of the twelfth aspect is preferably a hydrogen atmosphere, an argon atmosphere or a vacuum atmosphere.

The sintering temperature during the production by the solid-phase sintering method according to the thirteenth aspect of the present invention is not higher than the melting temperature of the conductive component, preferably within 100 ° C. from the melting temperature of the conductive component.

The arc resistance component of the contact material according to the fourteenth aspect of the present invention includes a main arc resistance component Cr and W and N as sub arc resistance components.
b, Ta, Ti, Mo and at least one of these carbides.

According to a fifteenth aspect of the present invention, the conductive component of the contact material contains at least one of Cu and Ag as a main component.

The auxiliary component of the contact material according to the invention of claim 16 contains at least one of Bi, Te, Se, Sb, and Co.

A feature of the invention of claim 17 is that the total content of the auxiliary components of the contact material is 5% by weight or less.

As described above, a contact material for a vacuum valve,
For example, in order to improve the cut-off characteristics of a Cu-Cr contact, it is necessary to control a trace element such as Al in the contact material. Therefore, in this example, two or more types of Cr having different Al contents are used as the arc-resistant raw material in order to improve the cutoff characteristics without extremely lowering the conductivity.

For example, using the same amount of a Cr powder containing almost no Al (5 ppm or less) and a Cr powder containing about 1000 ppm of Al, the Cu-50 wt% C
When an r-contact is manufactured, the Al content in the contact is 250 pp.
m, and many Cr particles in the contact material are A
Cr particles not containing l and Cr particles containing Al are present in the same weight.

In this case, since the surface is not added in the form of Al powder, which is easily oxidized, the amount of oxygen in the contact can be suppressed. Al is uniformly distributed,
Since Al is unevenly distributed microscopically, a decrease in conductivity can be suppressed. The same can be said for the trace element Fe at the Cu-W contact.

According to the present invention, it is possible to control the content and distribution of the trace elements in the contact material, and it is possible to improve the cutoff characteristics without extremely lowering the conductivity.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of a vacuum valve using the vacuum valve contact material of the present invention.

The shut-off chamber 1 comprises an insulating container 2 formed of an insulating material in a substantially cylindrical shape, and sealing fittings 3a, 3 at both ends thereof.
b and the metallic lids 4a and 4b provided through the airtight b. Furthermore, in the shut-off chamber 1, conductive rods 5,
A pair of electrodes 7 and 8 attached to the opposite ends of 6 are provided, and the upper electrode 7 is a fixed electrode and the lower electrode 8 is a movable electrode. A bellows 9 is attached to the electrode rod 6 of the movable electrode 8 to enable the electrode 8 to move in the axial direction while keeping the inside of the shut-off chamber 1 vacuum-tight. An arc shield 10 is provided to prevent the bellows 9 from being covered with arc vapor. The arc shield 11 is provided in the shut-off chamber 1 so as to cover the electrodes 7 and 8 to prevent the insulating container 2 from being covered with the arc vapor. Further, the electrode 8
As shown in an enlarged manner in FIG.
Or crimped by crimping. The contact 13a is connected to the brazing portion 14
It is fixed with. A contact 13b is crimped to the fixed electrode 7 as a fixed contact.

Next, the material constituting the vacuum valve contacts 13a and 13b used in the vacuum valve of the present embodiment will be described with reference to the table of FIG.

Examples 1 and 2 In Example 1, Cu-Cr contacts were manufactured by sintering infiltration using two types of Cr powders having different contents of the minor component Al. 2 containing 350ppm and 1800ppm of Al
Cu-Cr contacts containing 50 wt% of Cr and 530 ppm of a trace element Al were produced by mixing and using the same type of thermite Cr powder by the same weight. The conductivity and the maximum breaking current of this contact were slightly improved, and both were 1.1 times that of Comparative Example 1 described later.

In Example 2, three types of Cr powders having different contents of the minor component Al were used and Cu-C
An r-contact was manufactured. Electrolytic Cr powder containing 30 ppm Al, electrolytic Cr powder containing 250 ppm Al, 2 Al
Thermit Cr powder containing 000 ppm was used at a weight ratio of 1: 2: 7, respectively, to produce a Cu-Cr contact containing 50 wt% of Cr and 480 ppm of a trace element Al. The conductivity and the maximum breaking current of this contact are slightly improved,
They were 1.1 times and 1.2 times that of Comparative Example 1 described later, respectively.

On the other hand, in Comparative Example 1, Cu-
A Cr contact was manufactured. Thermitite Cr powder containing 1000ppm of a trace component Al is press-formed, and then sintered in a hydrogen atmosphere at 1150 ° C for 1 hour.
The r skeleton and the infiltrant Cu are placed one above the other in a crucible and heated at 1150 ° C. in a hydrogen atmosphere to remove Cu as a conductive component.
Was infiltrated to produce a Cu-Cr alloy containing 50 wt% of Cr and 500 ppm of a trace element Al.
This Cu—Cr alloy is formed into a predetermined contact shape (φ50 mm, t
After processing to 5 mm), the conductivity was measured by an eddy current measurement method, and further incorporated into a vacuum valve to perform a cutoff test. In the interruption test, the maximum interruption current was measured by gradually increasing the current value from 5 KA. Based on the measurement results of Comparative Example 1, the other measurement results are shown as relative values.

In Comparative Example 2, Cu-Cr contacts were manufactured by the sintering infiltration method. A small amount of Al powder is added to electrolytic Cr powder containing 10 ppm of Al, and a trace component Al is 1000 ppm.
A Cr skeleton was produced from the contained Cr powder, and a Cu-Cr contact was produced in the same manner as in Comparative Example 1. As a result of evaluating the conductivity and the breaking characteristics of this contact, the conductivity and the maximum breaking current were 0.95 times and 0.90 times the results of Comparative Example 1, respectively.
It was twice as low. This is because the oxygen content increased (about twice as large as that of Comparative Example 1) due to the use of Al powder whose surface is easily oxidized.

As described above, as a result of comparing a contact material having a minor component Al content of about 500 ppm in the Cu-50Cr contact material, as shown in Examples 1 and 2, two or more kinds of raw material powders having different trace elements were used. By using, the electric conductivity and the cutoff characteristics could be improved.

Examples 3 to 5 In Examples 3 to 5, the content of the trace element Al was 30 ppm and 160 ppm (the ratio of the content was 5.3) and 2 ppm, respectively.
0 ppm and 1200 ppm (content ratio is 60), 10 ppm
As a result of manufacturing a Cu-50Cr contact using two kinds of raw material Cr powders of ppm and 8000 ppm (content ratio is 800) and evaluating the electric conductivity and the blocking characteristics, Example 3 shows Comparative Example 3 1 .1 times and 1.1 times, Example 4 is Comparative Example 3
1.1 times and 1.2 times larger than that of Comparative Example 3 in Example 5.
And 1.1 times.

On the other hand, in Comparative Example 3, the trace element Al
Two types of Cr powders containing ppm and 100 ppm, that is, the content ratio was 3.3, Cu-50Cr contacts were manufactured, and the conductivity and the maximum breaking current were measured. As a result, both characteristics were equivalent to Comparative Example 1. Met.

In Comparative Example 4, two types of Cr powder containing trace element Al of 5 ppm or less and 6000 ppm, that is, a content ratio of 1200 or more were used to produce Cu-50Cr contacts, and the conductivity and the maximum breaking current were measured. Was 0.95 times and 1.0 times, respectively. This is presumably because the distribution of Al was extremely low and the conductivity was lowered, and as a result, the blocking characteristics were not improved.

As described above, as a result of comparing a contact material having an Al content of about 10 to 30 ppm in the Cu-50Cr contact material, as shown in Examples 3 to 5, two or more kinds of raw materials having different trace elements were used. By using the powder, the conductivity and the cutoff characteristics could be improved.

Examples 6 to 10 In Examples 1 to 5 and Comparative Examples 1 to 4, cases were described in which attention was paid to Al as a trace element, but the gist of the present invention is not limited to this.

In Examples 6 to 9, Fe, Si,
Cu-50Cr contacts were manufactured using two types of raw Cr powders having different trace elements of C, Al and Si, and the electrical conductivity and the breaking characteristics were evaluated.

In the sixth embodiment, the trace element Fe was added at 150 pp.
When two types of Cr powders containing m and 2000 ppm were used, the conductivity and the maximum breaking current were 1.1 times and 1.2 times that of Comparative Example 1, respectively.

In Example 7, the trace element Si was added at 50 ppm.
When the two types of Cr powders containing 700 ppm and 700 ppm were used, the conductivity and the maximum breaking current were 1.1 times that of Comparative Example 1 in both characteristics.

In Example 8, two types of Cr powder containing 30 ppm and 200 ppm of trace element C were used.
It increased by a factor of 1 and 1.2.

In Example 9, the content of the trace elements Al and Si was 20 ppm and 50 ppm, respectively.
The content of trace elements Al and Si is 100 ppm respectively
And two types of 300ppm Cr powder,
The conductivity and the maximum breaking current were 1.1 times and 1.3 times that of Comparative Example 1, respectively.

In Example 10, two types of Nb powder having different contents of the minor component Fe were used, and Cu was used for the sintering infiltration method.
A -Nb contact was manufactured. Fe 50ppm, 300pp
using two types of Nb powder containing Cu
% Nb contacts were produced. The conductivity and the maximum breaking current of this contact are slightly improved, and are 1.1 times and 1.times.
It was three times.

Example 11 In Example 11, two types of Cr powders having different production methods and different trace element Al contents were used, and Cu-5 was used.
An 0Cr contact was manufactured. Electrolysis C containing 30 ppm of Al
As a result of using two types of r powder (symbol: E) and thermite Cr powder (symbol: T) containing 500 ppm of Al, the conductivity and the maximum breaking current were 1.1 times and 1.2 times, respectively, of Comparative Example 1. It was twice.

In Example 12, a Cu powder containing almost no trace component Al (10 ppm or less) and a Cr powder containing 1000 ppm trace component Al were used to obtain Cu powder.
Manufacture -50Cr contacts and check the distribution of Al in the contacts by EDX
As a result of observation and analysis with a scanning electron microscope, there were two types of Cr particles: Cr particles containing Al and Cr particles not containing Al. As a result of evaluating the conductivity and the breaking characteristics of the contact material, the conductivity and the maximum breaking current value were 1.2 times those of Comparative Example 1 for both properties.

In Example 13, a Cu powder containing almost no trace component Si (20 ppm or less) and a Cr powder containing 1000 ppm trace component Si were used,
As a result of manufacturing and evaluating a -50Cr contact, there were two types of Cr particles including Cr particles containing Si and Cr particles not containing Si, and the conductivity and the maximum breaking current value were both characteristics.
1.2 times of

Examples 14 to 16 In Examples 14 to 16, Cu-50Cr contacts were formed by using two of the three types of powders A to C whose contents of the trace components Al and Si exhibited the following values. Manufactured and evaluated for conductivity and barrier properties.

Powder A: Al 30 ppm, Si 100 ppm Powder B: Al 200 ppm, Si 100 ppm Powder C: Al 200 ppm, Si 500 ppm In Example 14, powder A and powder B were used as raw Cr powders.
(The ratio of the contents of the trace components in both powders is as follows.
As a result of using 1.0), the conductivity and the maximum breaking current are
It was 1.1 times and 1.2 times that of Comparative Example 1, respectively.

In Example 15, as a result of using powder B and powder C (the ratio of the content of trace components in both powders was 1.0 for Al and 5.0 for Si) as the raw material Cr powder, the conductivity and the maximum The breaking current was 1.1 times that of Comparative Example 1 in both characteristics.

In Example 16, as a result of using powder A and powder C (the ratio of the content of the trace components in both powders was 6.7 for Al and 5.0 for Si) as the raw material Cr powder, the conductivity and the maximum The breaking current was 1.2 times that of Comparative Example 1 in both characteristics.

Examples 17 to 21 In Examples 17 to 19 and Comparative Examples 5 and 6, focusing on Al as a minor component, two types of Cr powders having different Al contents were used to form Cu-50Cr contacts. A in the contact
The amount of 1 was measured, and the conductivity and the cutoff characteristics were evaluated.

In Example 17, Al was added at 10 ppm and 50 ppm.
When the same weight of Cr powder containing ppm was used, the amount of Al in the contact was 15 ppm, and the electrical conductivity and the maximum breaking current were 1.2 times and 1.2 times that of Comparative Example 1, respectively.

In Example 18, 100 ppm of Al
When the same weight of Cr powder containing 00 ppm was used, the amount of Al in the contact was 100 ppm, and the electrical conductivity and the maximum breaking current were 1.1 times and 1.3 times that of Comparative Example 1, respectively.

In Example 19, Al was added at 200 ppm and 2 ppm.
When 2,000 ppm of Cr powder was used at a weight ratio of 2: 8, the Al content in the contact was 820 ppm, and the conductivity and the maximum breaking current were 1.0 times and 1.1 times that of Comparative Example 1, respectively.
It was twice.

On the other hand, in Comparative Example 5, the same weight of Cr powder containing 5 ppm or less of Al and 30 ppm of Al was used.
The amount of Al in the contact was 10 ppm or less, and the conductivity and the maximum breaking current were 1.2 times and 0.95 times that of Comparative Example 1, respectively.
The cutoff characteristics were slightly reduced.

In Comparative Example 6, Al was 200 ppm and 25 ppm.
When Cr powder containing 00 ppm was used at a weight ratio of 1: 9, the amount of Al in the contact was 1200 ppm, and the conductivity and the maximum breaking current were 0.95 times and 0.1%, respectively, of Comparative Example 1.
It was 90 times, and both properties were reduced by excessive addition of trace elements.

Examples 20 and 21 In Examples 20 and 21 and Comparative Examples 7 and 8, focusing on Si as a trace component, two types of Cr powders having different Si contents were used to form Cu-50Cr contacts. Manufactured and S in the contact
The i amount was measured, and the electrical conductivity and the cutoff characteristics were evaluated.

In Example 20, 60 ppm of Si was added to 35 ppm of Si.
When the same weight of Cr powder containing 0 ppm was used, the amount of Si in the contact was 100 ppm, and the conductivity and the maximum breaking current were 1.2 times and 1.1 times that of Comparative Example 1, respectively.

In Example 21, 500 ppm of Si and 3 ppm
When Cr powder containing 000 ppm was used at a weight ratio of 3: 7, the amount of Si in the contact was 1800 ppm, and the conductivity and the maximum breaking current were 1.0 times and 1.times.
It was one time.

In Comparative Example 8, 500 ppm of Si and 40 ppm
When Cr powder containing 00 ppm was used at a weight ratio of 1: 9, the Si content in the contact was 2100 ppm, the conductivity and the maximum breaking current were 0.95 times that of Comparative Example 1 for both characteristics, Both properties were degraded by excessive addition of.

In Comparative Example 7, the content of Si was 30 ppm or less and 1 ppm.
When the same weight of the Cr powder containing 50 ppm was used, the amount of Si in the contact was 40 ppm, and the electrical conductivity and the maximum breaking current were 1.2 times and 0.95 times that of Comparative Example 1, respectively.

Embodiments 22 and 23 In Embodiments 1-21 and Comparative Examples 1-6, the case where the contact material was manufactured by the sintering and infiltration method in a hydrogen atmosphere was described. It is not limited. Example 2
In No. 2, Cu-50 was obtained by a solid phase sintering method in a vacuum atmosphere.
A Cr contact was manufactured. Al with 350ppm and 1800p
Two types of Cr powder containing pm were mixed and used by the same weight. The Cr powder weight of Cu powder in ratio 1: After filling the crucible φ60mm were mixed so that the 1, ^{10 -3}
Sintering was performed in a vacuum of the order of Pa at 1030 ° C. for 2 hours. The obtained sintered body was subjected to 10 t /
After forming in cm ^2, and sintered under the same condition again, Cu-
A 50Cr alloy was obtained.

This Cu-50Cr alloy was formed into a predetermined shape (φ
(50 mm, t5 mm) to obtain a contact material. As a result of measuring the conductivity and the maximum breaking current value of this contact material, both properties were 1.1 times those of Comparative Example 1. Further, the same effect was obtained even when the solid phase sintering was performed in a non-oxidizing atmosphere such as a hydrogen atmosphere or an argon atmosphere instead of a vacuum.

In Example 23, a Cu-50Cr contact was manufactured by an arc melting method in an argon atmosphere. A total of four metal plates including two Cr plates (10 × 50 × 1000) of the same shape containing 350 ppm and 1800 ppm of Al and two Cu plates (9.7 × 50 × 1000) having the same weight as the Cr plate Are stacked on each other as electrodes, and a Cu-50Cr alloy obtained by arc melting in an argon atmosphere is formed into a predetermined shape (φ5
(0 mm, t5 mm) to obtain a contact material. As a result of measuring the conductivity and the maximum breaking current value of the contact material, they were 1.1 times and 1.2 times that of Comparative Example 1, respectively.

In the embodiment 23, the arc melting method is mentioned as an example of the melting method. However, the gist of the present invention is not limited to this. For the contact having a low Cr content such as Cu-10 wt% Cr, the induction melting method is used. The same effect can be obtained by using. Further, a similar effect can be obtained by melting the surface of the contact manufactured by the sintering method (sintering infiltration method, solid phase sintering method).

Further, in Example 22, the temperature of the solid phase sintering was 1030 ° C., that is, the melting point of the conductive component Cu (1083
(° C.), a case where the temperature is 53 ° C. lower is described, but the gist of the present invention is not limited to this.

Examples 24 and 25 In Examples 24 and 25 and Comparative Example 9, the temperature of the solid phase sintering was
Cu-5 at 1080 ° C, 1000 ° C and 920 ° C respectively
0Cr contacts were fabricated and evaluated for conductivity and blocking characteristics.

As a result, in Example 24, the conductivity and the maximum breaking current were 1.1 times and 1.3 times that of Comparative Example 1, and in Example 25, 1.1 times and 1.1 times that of Comparative Example 1. , Comparative Example 9
Were 1.0 times and 0.95 times that of Comparative Example 1. Note that C
For the production of u-Cr contacts, a trace element Al content of 35
Two types of Cr powders, 0 ppm and 1800 ppm, were used.

In Examples 1 to 25 and Comparative Examples 1 to 9,
Although the case of the binary contact material of Cu-Cr or Cu-Nb has been described, the gist of the present invention is not limited to this.

In Example 25, the main arc resistance component was Cr and the sub arc resistance component was W, Cu-20 wt% Cr-10 wt% W
The contact point was determined to be 300 ppm with a trace element Fe content of 50 ppm.
pm W powder was manufactured by a sintering infiltration method in a vacuum atmosphere, and the conductivity and the breaking characteristics were evaluated. As a result, the conductivity and the maximum breaking current were both 1.1 characteristics of Comparative Example 1. It was twice.

Embodiments 26 and 27 In Embodiment 26, a Cu-25 wt% Cr-5 wt% W contact having Cr as an arc resistant component and Bi as an auxiliary component was used to form a Cr powder having trace element Al contents of 350 ppm and 1800 ppm. As a result of evaluating the electric conductivity and the breaking characteristics by using the solid-state sintering method in a hydrogen atmosphere by using the method, the electric conductivity and the maximum breaking current were 1.2 times and 1.1 times of Comparative Example 1, respectively. Met.

As shown by the above results, the present invention makes it possible to improve the breaking characteristics and the conductivity of the contact material for a vacuum valve.

In the present embodiment, there is only a description of W as the sub-arc-proof component when Cr is used as the main arc-proof component. However, W, Nb, Ta, Ti, Mo, and carbides of these materials are described. The same effect can be obtained even if at least one of them is used as an auxiliary arc resistant component.

In the present embodiment, the conductive component is described only in Cu, but the same effect can be obtained by using Cu or Ag as a main component.

Further, in this embodiment, the auxiliary component is described only in Bi, but Bi, Te, Se, S
Similar effects can be obtained by using at least one of b and Co as an auxiliary component.

[0079]

As described above in detail, according to the contact material for a vacuum valve of the present invention, a vacuum circuit breaker or the like can be obtained by using two or more types of Cr having different trace element contents as arc-resistant materials. Among the characteristics required for the contact material of the vacuum valve used in the present invention, it is possible to stably improve both the cutoff characteristic and the conductivity.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a vacuum valve using a contact material for a vacuum valve of the present invention.

FIG. 2 is an enlarged cross-sectional view of a contact portion shown in FIG.

FIG. 3 shows conductive components, isolated components, auxiliary components, manufacturing methods, and test results when manufactured under these conditions, which constitute the material of the vacuum valve contact shown in FIG. FIG. 10 is a table diagram showing a list of ９9.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shutoff room 2 Insulating container 3a, 3b Sealing fitting 4a, 4b Lid 5, 6 Conductive rod 7 Fixed electrode 8 Movable electrode 9 Bellows 10, 11 Arc shield 12, 14 Brazing part 13a Movable contact 13b Fixed contact

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Kusano 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu Plant, Inc. 72) Inventor Atsushi Yamamoto 1 Toshiba-cho, Fuchu-shi, Tokyo F-term in the Fuchu Plant of Toshiba Corporation 5G026 BA01 BA07 BB02 BB04 BB05 BB08 BB11 BB12 BB13 BB14 BB15 BB16 BB17 BB18 BB21 BB24 BB25 BB27 BC09 BC08 BC08 BC08 BC08

Claims (17)

[Claims] 1. By opening and closing contacts in a vacuum,
In a vacuum valve contact material forming the above-mentioned contact of a vacuum valve for interrupting and conducting a current, the contact material for a vacuum valve comprises a conductive component, an arc-resistant component and an auxiliary component added as necessary, and A contact material for a vacuum valve characterized by being manufactured by using two or more kinds of arc-resistant raw materials having different trace element contents. 2. The contact material for a vacuum valve according to claim 1, wherein the contents of the trace elements in two or more kinds of the arc-resistant materials of the arc-resistant components differ from 5 to 1000 times. 3. The trace element having a different content of the arc resistant component in the raw material is at least one of Fe, Al, Si, and C.
3. The contact material for a vacuum valve according to claim 1, wherein the material is at least one kind. 4. The contact material for a vacuum valve according to claim 1, wherein the arc-resistant component contains Cr as a main component. 5. The raw material of Cr, which is the main component of the arc resistant component, is composed of Cr produced by an electrolytic method and C produced by a thermite method.
5. The contact material for a vacuum valve according to claim 4, wherein r is two kinds. 6. The trace element having a different content of Cr, which is a main component of the arc-resistant component, in the raw material is at least one kind of Al or Si. Contact material for vacuum valves. 7. The raw material of Cr, which is a main component of the arc-resistant component, includes Cr particles containing Al and Cr not containing Al.
7. The contact material for a vacuum valve according to claim 6, wherein both particles are present. 8. The raw material of Cr which is a main component of the arc resistant component includes Cr particles containing Si and Cr not containing Si.
7. The contact material for a vacuum valve according to claim 6, wherein both particles are present. 9. The trace component having a different content of the arc-resistant component in the raw material, wherein Al has a content of 10 ppm to 1000 ppm and Si has a content of 50 ppm to 2,000 ppm. Contact material for vacuum valves. 10. The contact material for a vacuum valve according to claim 1, wherein the contact material is manufactured by a sintering infiltration method, a solid-phase sintering method, or a melting method. 11. The atmosphere during sintering or melting when manufacturing the contact material by a sintering infiltration method, a solid phase sintering method or a melting method is a non-oxidizing atmosphere. Item 10
The contact material for a vacuum valve as described in the above. 12. The contact material for a vacuum valve according to claim 11, wherein the non-oxidizing atmosphere is preferably a hydrogen atmosphere, an argon atmosphere, or a vacuum atmosphere. 13. The sintering temperature during the production by the solid phase sintering method is not higher than the melting temperature of the conductive component, preferably within 100 ° C. from the melting temperature of the conductive component. Or a contact material for a vacuum valve according to item 12. 14. The arc resistance component of the contact material includes Cr as a main arc resistance component and W, Nb, Ta, and T as sub arc resistance components.
The contact material for a vacuum valve according to any one of claims 4 to 13, further comprising at least one of i, Mo, and these carbides. 15. The contact material for a vacuum valve according to claim 1, wherein a conductive component of the contact material mainly contains at least one of Cu and Ag. 16. An auxiliary component of the contact material is Bi, T
The contact material for a vacuum valve according to any one of claims 1 to 15, comprising at least one of e, Se, Sb, and Co. 17. The contact material according to claim 16, wherein the total content of the auxiliary components is 5% by weight or less.
The contact material for a vacuum valve as described in the above.