Contact material applied to middle-high-voltage vacuum switch-on/off and preparation method for same

A contact material, medium and high pressure technology, applied in the field of powder metallurgy, can solve the problems of poor welding resistance, low pressure resistance of materials, and inapplicability, and achieve the goal of improving welding resistance, pressure resistance and compactness Effect

Inactive Publication Date: 2013-04-24
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ceramic-reinforced copper alloy provided by the invention is mainly used in non-vacuum and low-voltage applications such as lead frames of integrated circuits, connectors and resistance welding electrodes, but due to the problems of low pressure resistance and poor welding resistance of the prepared materials Can not be used in medium and high pressure vacuum switches

Method used

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  • Contact material applied to middle-high-voltage vacuum switch-on/off and preparation method for same
  • Contact material applied to middle-high-voltage vacuum switch-on/off and preparation method for same
  • Contact material applied to middle-high-voltage vacuum switch-on/off and preparation method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, 10kg of the contact material used in the medium and high pressure vacuum breaking of the present invention is produced, and the composition ratio of each raw material used is:

[0029] Cu6.5kg, accounting for 65% by mass;

[0030] Cr3.0kg, accounting for 30% by mass;

[0031] TiC0.5kg, accounting for 5.0% by mass.

[0032] Preparation steps:

[0033] (1) According to the above chemical ratio, weigh 3.0kg of Cr powder and 0.5kg of TiC powder and mix evenly, then mix in 6.5kg of Cu powder, and mix the powder with a powder mixer for 8 hours;

[0034] (2) Fill the mixed powder into the forming mold, and apply a pressure of 30 MPa through a four-column hydraulic press to form the mixed powder into a compact with a certain shape;

[0035] (3) Put the pressed compact into a graphite crucible, then place the graphite crucible in a vacuum induction hot-pressing sintering furnace, and evacuate to 2×10 -2 After Pa, heat to 800°C, pressurize at 25MPa, keep w...

Embodiment 2

[0039] In this embodiment, 10kg of the contact material used in the medium and high pressure vacuum breaking of the present invention is produced, and the composition ratio of each raw material used is:

[0040] Cu8.1kg, accounting for 81% by mass;

[0041] Cr0.5kg, accounting for 5% by mass;

[0042] ZrC1.4kg, accounting for 14% by mass.

[0043] Preparation steps:

[0044] (1) According to the above chemical ratio, weigh 0.5kg of Cr powder and 1.4kg of ZrC powder and mix evenly, then mix in 8.1kg of Cu powder, and mix the powder with a powder mixer for 8 hours;

[0045] (2) Fill the mixed powder into the forming mold, and apply a pressure of 60 MPa through a four-column hydraulic press to form the mixed powder into a compact with a certain shape;

[0046] (3) Put the pressed compact into a graphite crucible, place the crucible in a vacuum induction hot pressing sintering furnace, and evacuate to 2×10 -2 After Pa, heat to 900°C, pressurize at 50MPa, keep warm for 1 hour, ...

Embodiment 3

[0049] In this embodiment, 10kg of the contact material used in the medium and high pressure vacuum breaking of the present invention is produced, and the composition ratio of each raw material used is:

[0050] Cu: 5.0kg, accounting for 50% by mass;

[0051] Cr: 4.8kg, accounting for 48% by mass;

[0052] B 4 C: 0.2kg, accounting for 2% by mass.

[0053] Preparation steps:

[0054] (1) According to the above chemical ratio, weigh 4.8kg Cr powder and 0.2kg B 4 Mix C powder evenly, then mix in 5.0kg of Cu powder, and mix the powder with a powder mixer for 8 hours;

[0055] (2) Fill the mixed powder into the forming mold, and apply a pressure of 50 MPa through a four-column hydraulic press to form the mixed powder into a compact with a certain shape;

[0056] (3) Put the pressed compact into a graphite crucible, place the crucible in a vacuum induction hot pressing sintering furnace, and evacuate to 2×10 -2 After Pa, heat to 1000°C, pressurize to 40MPa, keep warm for 1 hou...

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Abstract

The invention discloses a contact material applied to middle-high-voltage vacuum switch-on/off and a preparation method for the same. The contact material is prepared from the following raw materials in percent by weight: 5-50% of Cr powder, 1-15% of carbide and the balance of Cu powder. Compared with the prior art, the contact material disclosed by the invention has the beneficial effects that a design thought of further distributing a ceramic phase with a higher melting point in the existing copper-based material except a Cr phase with a high melting point is adopted; the ceramic phase has the functions of reinforcing the mechanical performance of the copper-based material and improving the welding resistance of the contact material; and via a hot-pressing sintering process, the compactness of a mixed powder contact is improved, and the material defects of closed pores, enrichment and the like of the mixed powder contact are reduced, thus improving the ablation performance of the contact material. Therefore, the contact material applied to middle-high-voltage vacuum switch-on/off disclosed by the invention is low in resistivity, improved in hardness, mechanical strength and compactness compared with common mixed powder contacts, improved in the voltage-resistant capacity of the mixed powder contact, strong in switch-on/off capacity, and good in welding resistance.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a contact material used in medium and high voltage vacuum breaking and a preparation method thereof. Background technique [0002] According to the Cu-Cr binary alloy phase diagram, the solid solubility of Cr in Cu and Cu in Cr is very low. Therefore, Cu-Cr alloys are actually pseudoalloys with a two-phase structure. This structural feature enables Cu and Cr to fully maintain their respective good characteristics: a Cu phase with a low melting point, high electrical conductivity and thermal conductivity, which is conducive to improving the breaking capacity of the vacuum switch; it has a higher melting point and mechanical The strong Cr phase ensures that the vacuum switch has good withstand voltage, anti-ablation, anti-welding and low current cut-off characteristics. In addition, the Cr phase has a strong gas absorption ability, so that the residual gas in the arc extinguishin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C32/00C22C1/05
Inventor 刘凯王小军王文斌李刚
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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