Vacuum copper-based electrical contact composite material containing ceramic phase and preparation method of vacuum copper-based electrical contact composite material

A composite material and ceramic phase technology, applied in the field of powder metallurgy, can solve problems such as poor high-temperature electrical conductivity, no Cr phase, mechanical strength and welding resistance that cannot meet the requirements of medium and high voltage vacuum switches, and achieve high withstand voltage capacity and breaking capacity, the effect of high mechanical strength

Inactive Publication Date: 2012-08-08
NORTHEASTERN UNIV LIAONING +1
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Problems solved by technology

[0003] Chinese patent 1787137A discloses a high-performance copper-diamond electrical contact material and its manufacturing process. Although its electrical conductivity and density are superior to Cu-Cr alloys, its high melting point component diamond content is very low, so its mechanical The strength and anti-welding properties cannot meet the requirements of medium and high voltage vacuum switches; Chinese patent 1887137A discloses a copper-diamond electrical contact material with a small amount of silver added. Based on the same reasons as above, this contact material is also not suitable. For medium and high pressure vacuum switches
[0004] Chinese patent 101698911A discloses a copper-aluminum base electrical contact composite material, in addition to copper, aluminum, tin and rare earth metals, this material also adds no more than 3% B 4 C, but its purpose is to replace silver-based electrical contact materials in low-voltage switches, so it is not suitable for medium and high-voltage vacuum switches; Chinese patent 101452773A discloses a copper-based SiC p Rare-earth metal-ceramic composite electrical contact material, which contains not more than 15% ceramic phase SiC particles in addition to metal Cu, Te, Ni, and rare earth, and its purpose is also to replace silver-based electrical contact materials in low-voltage switches
[0005] Chinese patent 101345143A discloses a Cu / Ti 3 SiC 2 Electrical contact material and its preparation process, the material contains up to 80% (mass percentage) of ceramic phase Ti in addition to the metal element Cu 3 SiC 2 And other trace additives, its microstructure is mainly composed of a metal phase and a ceramic phase, but it does not contain Cr phase, and its high temperature conductivity is poor, so it is not suitable for medium and high voltage vacuum switches

Method used

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  • Vacuum copper-based electrical contact composite material containing ceramic phase and preparation method of vacuum copper-based electrical contact composite material
  • Vacuum copper-based electrical contact composite material containing ceramic phase and preparation method of vacuum copper-based electrical contact composite material
  • Vacuum copper-based electrical contact composite material containing ceramic phase and preparation method of vacuum copper-based electrical contact composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Composition ratio: Cu 5.00 kg, accounting for 50% by mass;

[0026] Cr 4.71 kg, accounting for 47.1% by mass;

[0027] B 4 C 0.29kg, accounting for 2.9% by mass.

[0028] (1) According to the above chemical ratio, weigh 4.71kg of chromium powder and 0.29kg of boron carbide powder and mix evenly, then mix in 0.5kg of copper powder, and mix the powder with a powder mixer for 8 hours;

[0029] (2) Put the mixed powder into the crucible and press it flat, place the crucible in a vacuum heating furnace, and evacuate to ≤5x10 -2 After Pa, heat to 1000°C and keep it warm for 10 hours to obtain the sintered composite powder, and turn on the furnace to cool;

[0030] (3) Put 4.5kg copper rod in the crucible, start the vacuum heating furnace again, rapidly raise the temperature to 1350°C, and start copperization. After the copperization is completed, lower the temperature to 1100°C, keep it for 60 minutes, and finally turn off the heating system to obtain a...

Embodiment 2

[0041] Composition ratio: Cu 5.17kg, accounting for 51.65% by mass;

[0042] Cr 4.57kg, accounting for 45.7% by mass;

[0043] B 4 C 0.265kg, accounting for 2.65% by mass.

[0044] (1) According to the above chemical ratio, weigh 4.57kg of chromium powder and 0.265kg of boron carbide powder and mix evenly, then mix in 0.457kg of copper powder, and mix the powder with a powder mixer for 8 hours;

[0045] (2) Put the mixed powder into the crucible and press it flat, place the crucible in a vacuum heating furnace, and evacuate to ≤5x10 -2 After Pa, heat to 1400°C and keep it warm for 0.5 hours to obtain the sintered composite powder, then turn on the furnace to cool;

[0046] (3) Put 4.713kg of copper rod in the crucible, start the vacuum heating furnace again, rapidly raise the temperature to 1350°C, and start copperization. After the copperization is completed, lower the temperature to 1200°C, keep it for 20 minutes, and finally turn off the heating system ...

Embodiment 3

[0054] Composition ratio: Cu 6.78 kg, accounting for 67.8% by mass;

[0055] Cr 3.00 kg, accounting for 30% by mass;

[0056] B 4 C 0.22kg, accounting for 2.2% by mass.

[0057] (1) According to the above chemical ratio, weigh 3.00kg of chromium powder and 0.22kg of boron carbide powder and mix evenly, then mix in 0.45kg of copper powder, and mix the powder with a powder mixer for 8 hours;

[0058] (2) Put the mixed powder into the crucible and press it flat, place the crucible in a vacuum heating furnace, and evacuate to ≤5x10 -2 After Pa, heat to 1000°C and keep it warm for 5 hours to obtain the sintered composite powder, and turn on the furnace to cool;

[0059] (3) Put 6.33kg copper rod in the crucible, start the vacuum heating furnace again, rapidly raise the temperature to 1350°C, and start copperization. After the copperization is completed, lower the temperature to 1150°C, keep it for 30 minutes, and finally turn off the heating system to obtain ...

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Abstract

The invention relates to the field of powder metallurgy, in particular to a vacuum copper-based electrical contact composite material containing a ceramic phase and a preparation method of the vacuum copper-based electrical contact composite material. According to the invention, the vacuum copper-based electrical contact composite material containing the ceramic phase comprises the following chemical components in percentage by mass: 5-50% of Cr, 1-10.5% of B4C and Cu in balancing amount. The preparation method comprises the following steps: uniformly mixing Cr powder, B4C powder and Cu powder so as to obtain mixed powder; adding a copper rod and putting the copper rod in a vacuum heating furnace; after the temperature rises to 1350 DEG C, beginning to smelt the copper; after the copper is smelted, reducing the temperature of the smelted copper rod to 1100-1200 DEG C; preserving the heat of the smelted copper rod for 20-60 minutes; cooling the smelted copper rod to room temperature so as to obtain a composite material blank; and annealing the composite material blank so as to obtain the vacuum copper-based electrical contact composite material containing the ceramic phase. The vacuum copper-based electrical contact composite material containing the ceramic phase, provided by the invention, has the advantages of higher mechanical strength, higher voltage resistance and higher breaking capacity and can be used for medium and high voltage vacuum switches after being appropriately machined.

Description

technical field [0001] The invention relates to the field of powder metallurgy, and specifically relates to a copper-based vacuum electric contact composite material containing a ceramic phase and a preparation method thereof. Background technique [0002] Cu-Cr alloys do not form intermetallic compound phases at high and low temperatures, and their microstructure usually consists of Cu-rich solid solution phases and Cr-rich solid solution phases. Among them, the Cu-rich solid solution phase has good electrical and thermal conductivity, while the Cu-rich The solid solution of Cr has high hardness and high melting point. Therefore, Cu-Cr alloy has the dual characteristics of high strength and high conductivity, and has been widely used as an electrical contact material in vacuum circuit breakers. In order to improve the mechanical and electrical properties of Cu-Cr alloys, it is modified by adding other metal elements such as Fe, W, Nb, Mo, Zr, Te, Ti and Co at home a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C27/06C22C32/00C22C30/02C22C1/05H01H1/021H01H11/04
Inventor 高建荣王文斌王小军刘凯
Owner NORTHEASTERN UNIV LIAONING
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