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Reducing medium for bright annealing of cu‑mn‑ni series precision resistance alloy strip and its annealing method

A technology of precision resistance and bright annealing, applied in the field of material processing, can solve the problems of poor mechanical properties of copper alloys, long production cycle, high equipment cost, reduce labor intensity, improve working environment, and improve stability and consistency. Effect

Active Publication Date: 2017-06-06
厦门火炬特种金属材料有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although some manufacturers use protective atmosphere (such as hydrogen, carbon monoxide) annealing, the surface finish of Cu-Mn-Ni series precision resistance products is guaranteed, and the surface Mn removal phenomenon has been improved; but the surface Mn removal layer still exists, and the protective atmosphere Annealing has problems such as high equipment cost, long production cycle, and poor safety
Especially the protective annealing in a hydrogen atmosphere can lead to the "hydrogen disease" phenomenon of copper alloys, resulting in poor mechanical properties of copper alloys

Method used

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  • Reducing medium for bright annealing of cu‑mn‑ni series precision resistance alloy strip and its annealing method

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Experimental program
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Effect test

Embodiment 1

[0046] Prepare 20Kg mixed powder covering agent, in which NH 4 HCO 3 Crystal (500 mesh) 25.0wt%, pure Si powder (500 mesh) about 10.0wt%, pure Mn powder (500 mesh) about 12.0wt%, and the rest is 1200 mesh MgO powder. After the above powder is fully and completely mixed, pour it into a ring-shaped seamless iron container filled with 6J13 precision resistance alloy flat strip products (specification 12×1.5mm) until the product to be treated is completely covered. After compacting and tamping the powder, the covered thickness of the product should be kept at about 45mm. Cover the ring-shaped iron container tightly and raise the temperature to 760°C with the furnace, keep it warm for about 6 hours, then remove it from the bell furnace, and take out the 6J13 flat belt after cooling to room temperature. The flat strip sample has a good surface finish. The surface and core element compositions are shown in Table 2 through fluorescence spectrometer analysis. The difference between t...

Embodiment 2

[0050] Prepare 20Kg mixed powder covering agent, in which NH 4 HCO 3 Crystal (500 mesh) 20.0wt%, pure Si powder (500 mesh) about 15.0wt%, pure Mn powder (500 mesh) about 8.0wt%, and the rest is 1200 mesh MgO powder. After the above powder is fully and completely mixed, pour it into a ring-shaped seamless iron container filled with 6J8 precision resistance alloy flat strip products (specification 12×1.5mm) until the product to be treated is completely covered. After compacting and tamping the powder, the covered thickness of the product should be kept at about 45mm. Cover the ring-shaped iron container tightly and raise the temperature to 760°C with the furnace, keep it warm for about 6 hours, then remove it from the bell furnace, and take out the 6J8 flat belt after cooling to room temperature. The flat strip sample has a good surface finish. The surface and core element compositions are shown in Table 3 through fluorescence spectrometer analysis. The difference between the ...

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Abstract

The invention discloses a reduction medium for bright annealing of a Cu-Mn-Ni series precision resistance alloy strip. The reduction medium is used for stress relief annealing and final finished product annealing between working procedures carried out in the Cu-Mn-Ni series precision resistance alloy flat strip product machining process; and the adopted reduction medium is an alkaline powder medium which comprises, by weight, 20.0%-25.0% of NH4HCO3, 10.0%-15.0% of pure Si powder, 8.0%-12.0% of pure Mn powder and the balance MgO. The Cu-Mn-Ni series precision resistance alloy strip is arranged in the reduction alkaline powder medium for high-temperature annealing, when the annealing temperature is not higher than 900 DEG C, the surface of the product can still keep the original color and luster, no oxidation demanganization occurs on the surface layer, serious oxidation black coating and demanganization, caused by a conventional annealing process, on the surface of a manganin strip are prevented, and therefore the trend that the temperature drift coefficient is reduced due to demanganization of the surface of the manganin strip is avoided. Compared with other annealing modes, the technical way has the beneficial effects of being good in protection effect, high in efficiency, low in cost, easy to operate and popularize and the like.

Description

technical field [0001] The invention relates to a reducing medium for bright annealing of a Cu-Mn-Ni series precision resistance alloy strip and an annealing method thereof, belonging to the technical field of material processing. Background technique [0002] Cu-Mn-Ni series precision resistance alloys are key materials for the preparation of high-precision electrical instruments, and are widely used in the fields of smart meters, electronic and electrical measuring instruments, such as shunts in smart meters. The alloy requires a very small temperature drift coefficient of resistance (that is, the change rate of resistance to temperature) and thermal potential to copper, as well as excellent corrosion resistance and welding process performance. At present, Cu-Mn-Ni series precision resistance materials mainly include 6J8, 6J12 and 6J13 alloys, and their chemical compositions are shown in Table 1. Mn is the main alloying element of precision resistance alloy, the addition ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/08
CPCC22F1/08
Inventor 邹宏辉李祥黄文辉冯凌集林国勇卢晓军
Owner 厦门火炬特种金属材料有限公司
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