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Copper-based chromium-niobium electrical contact material and preparation method thereof, copper-based electrical contact and air-type high-voltage isolating switch

An electrical contact, copper-based technology, applied in the direction of electrical switches, electrical components, contacts, etc., can solve the problems of large contact resistance, loose electrical contacts, easy to generate heat, etc., achieve small difference in thermal elastic modulus, and prevent loosening or fall off, the effect of strong heat transfer performance

Active Publication Date: 2021-11-02
ELECTRIC POWER RES INST OF EAST INNER MONGOLIA ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Cu-Cr 2 When Nb is used as an electrical contact, when it is connected to a conductive base of pure copper, on the one hand, due to Cr 2 The composition of the Nb composite material layer and the pure copper substrate is quite different. The connection between the two is prone to heating and thermal deformation due to the large contact resistance. Long-term use will cause peeling at the connection between the electrical contact and the conductive substrate, resulting in electrical Loosening or falling off of contacts
On the other hand, in order to make the connection between the electrical contact and the conductive substrate stronger, solder is usually used for welding, but the addition of solder will affect the thermal conductivity and electrical conductivity between the electrical contact and the conductive substrate

Method used

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  • Copper-based chromium-niobium electrical contact material and preparation method thereof, copper-based electrical contact and air-type high-voltage isolating switch
  • Copper-based chromium-niobium electrical contact material and preparation method thereof, copper-based electrical contact and air-type high-voltage isolating switch
  • Copper-based chromium-niobium electrical contact material and preparation method thereof, copper-based electrical contact and air-type high-voltage isolating switch

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preparation example Construction

[0055] The embodiment of the present invention also provides a preparation method of the copper-based chromium diniobium electrical contact material, which is characterized in that it includes:

[0056] A variety of Cu powder, Cr powder, and Nb powder with different weight ratios are provided, and the Cu powder, Cr powder, and Nb powder of each weight ratio are printed and formed by 3D printing technology in turn to obtain the composite layer, wherein, The composite layer is formed on the pure copper substrate by layer-by-layer printing with the total content of Cr powder and Nb powder from low to high.

[0057] The preparation method of the copper-based chromium niobium electrical contact material provided by the embodiment of the present invention uses 3D printing technology to prepare Cu powder, Cr powder and Nb powder with different weight ratios to obtain Cu and Cr 2 The copper-based chromium-niobium electrical contact material with the mass percentage of Nb in a gradient...

Embodiment 1

[0075] S00, provide 4 kinds of Cu powder, Cr powder, Nb powder with different weight proportions, recorded in mass percentage, respectively: 70% Cu powder, 15.84% Cr powder and 14.16% Nb powder, 80% Cu powder, 10.56% % Cr powder and 9.44% Nb powder, 90% Cu powder, 5.28% Cr powder and 4.72% Nb powder, 95% Cu powder, 2.64% Cr powder and 2.36% Nb powder. The purity of the Cu powder, Cr powder and Nb powder are all greater than or equal to 99.95%, and the particle diameters are all less than 50 μm.

[0076] S10, 4 kinds of Cu powder, Cr powder, and Nb powder with different weight ratios were fully mixed in a three-dimensional powder mixer for 3 hours to obtain 4 kinds of mixed powders.

[0077] S20, placing 0.05mm thick pure copper as a substrate on the first lifting platform 12, and then putting the mixed powder of 95% Cu powder, 2.64% Cr powder and 2.36% Nb powder into the powder cylinder of the 3D printer 21, the mixed powder is placed on the second lifting platform 22.

[00...

Embodiment 2

[0081]S00 provides 6 kinds of Cu powder, Cr powder and Nb powder with different weight ratios, recorded in mass percentage, respectively: 70% Cu powder, 15.84% Cr powder and 14.16% Nb powder, 75% Cu powder, 13.2% % Cr powder and 11.8% Nb powder, 80% Cu powder, 10.56% Cr powder and 9.44% Nb powder, 85% Cu powder, 7.92% Cr powder and 7.08% Nb powder, 90% Cu powder, 5.28% Cr powder and 4.72% %Nb powder, 95% Cu powder, 2.64% Cr powder and 2.36% Nb powder. The purity of the Cu powder, Cr powder and Nb powder are all greater than or equal to 99.95%, and the particle diameters are all less than 50 μm.

[0082] S10, 6 kinds of Cu powders, Cr powders, and Nb powders with different weight ratios were fully mixed in a three-dimensional powder mixer for 3 hours to obtain 6 kinds of mixed powders.

[0083] S20, placing a 0.05mm thick pure copper substrate as the substrate on the first lifting platform 12, and then putting the mixed powder of 95% Cu powder, 2.64% Cr powder and 2.36% Nb pow...

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Abstract

The invention relates to a copper-based chromium diniobium electrical contact material, which comprises a pure copper layer and a composite layer formed on the pure copper layer, and the composite layer includes multiple layers of Cu-Cr stacked in sequence 2 Nb alloy layer, Cu‑Cr per layer 2 The Nb alloy layer includes Cu and Cr with different mass percentages 2 Nb, and the Cu and Cr 2 The mass percentage of Nb is distributed in a gradient in the thickness direction, from the pure copper layer upwards, each layer of Cu-Cr 2 Cr in Nb alloy layer 2 The mass percentage of Nb increases sequentially.

Description

technical field [0001] The invention relates to the technical field of preparation of electric contact composite materials, in particular to a copper-based chromium-diniobium electric contact material and a preparation method thereof, a copper-based electric contact and an air-type high-voltage isolating switch. Background technique [0002] High-voltage switch electrical contacts are mainly responsible for connecting and breaking circuits and load currents, and their performance directly affects the safe and reliable operation of switching appliances. Good electrical contacts should have high thermal conductivity, high resistance to ablation, and low cut-off value , stable and low contact resistance, and stable chemical properties. At present, copper-based and silver-based electrical contacts are widely used. With the continuous development of technology, alternative materials have been widely studied. In the field of vacuum switch electrical contacts, they are often It is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H1/025H01H11/04
CPCH01H1/025H01H11/048
Inventor 韩建军刘源钱文晓袁竭郭金刚党乐张俊双张云良
Owner ELECTRIC POWER RES INST OF EAST INNER MONGOLIA ELECTRIC POWER
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