WO2024200375A1 - Alliage résistif de précision à base de cuivre, de manganèse, de nickel et d'étain - Google Patents
Alliage résistif de précision à base de cuivre, de manganèse, de nickel et d'étain Download PDFInfo
- Publication number
- WO2024200375A1 WO2024200375A1 PCT/EP2024/057994 EP2024057994W WO2024200375A1 WO 2024200375 A1 WO2024200375 A1 WO 2024200375A1 EP 2024057994 W EP2024057994 W EP 2024057994W WO 2024200375 A1 WO2024200375 A1 WO 2024200375A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- alloy
- copper
- proportion
- precision
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/05—Alloys based on copper with manganese as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/06—Alloys based on copper with nickel or cobalt as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
Definitions
- the present invention relates to the field of precision resistive alloys based on copper and, more particularly, to a resistive alloy whose main constituents are copper and manganese, and also comprising nickel, tin, and optionally silicon.
- Copper-manganese alloys are known for their electrical properties, and in particular for their resistivity.
- thermoelectric resistive alloys in addition to resistivity as an essential characteristic, there is the temperature coefficient of resistance, also noted TCR (Temperature Coefficient Resistance), as well as the thermoelectric power, noted PTE.
- the present invention relates more specifically to an alloy having optimum stability of resistivity after exposure to temperature over a long period of use (several hundred hours), a very low temperature coefficient and a very low thermoelectric power, which will be used in precision resistors for current measurement or in standard resistors.
- This alloy can also be used in the manufacture of precision chip resistors (or SMD - Surface Mount Resistor and Chip Resistors) such as metal foil resistors or current sense resistors (Current Sense Resistors).
- precision chip resistors or SMD - Surface Mount Resistor and Chip Resistors
- metal foil resistors or current sense resistors (Current Sense Resistors).
- the shunt in particular, consists of a core made from a resistive alloy, and two copper connectors, and said connectors are assembled to the core by welding, the potential difference between the materials of the core and the copper connectors conditioning the PTE, the latter having to be as low as possible.
- thermoelectric power reflects the appearance of a difference in electrical potential between a pair of materials subjected to a temperature gradient.
- Resistivity noted Q, as opposed to conductivity, defines the capacity of a material to block the passage of electrical charges, and therefore of current.
- the resistivity Q of copper is very low (1.724 pQ.cm in the annealed state), which makes it an excellent electrical conductor. Indeed, the electrical conductivity of copper is defined as being equal to 100% IACS (International Annealed Copper Standard).
- the temperature coefficient, TC represents the variation of a physical property, which can be, for example, the thermal conductivity of a material, the mechanical strength, or the resistance of a conductor, as a function of temperature.
- the physical quantity of interest is the temperature coefficient of resistance (TCR); it is therefore this property which will be measured, and for which we seek to achieve the lowest possible value.
- TCR temperature coefficient of resistance
- manganese may be added to this copper, which has the effect of increasing the resistivity of the alloy and the thermoelectric power, while lowering the temperature coefficient.
- the addition of nickel to the preceding alloy has the effects, on the one hand, of increasing the resistivity, with however a lesser effect than that of manganese and, on the other hand, of lowering the thermoelectric power.
- the TCR can be negative, positive or zero depending on the combination of elements and the temperature range.
- Tin and silicon may also be added, in proportions of up to 3% by mass for tin, and 1% for silicon, to adjust the temperature coefficient of resistance, the thermoelectric power, and improve the temperature stability of the resistivity.
- Silicon may also be added, in a proportion of up to 1%.
- such alloys require, at the time of their preparation, the carrying out of a vacuum or controlled atmosphere fusion of the elements, so as to avoid the formation of MnO oxides likely to alter the properties of the alloy.
- the transfer of the liquid alloy to the ingot mold frequently requires the use of technologies that do not involve passage to air (source process).
- the present invention aims to be able to propose a copper-based alloy, the composition of which is furthermore constituted by at least manganese, nickel and tin, for the production of precision resistors having both a high resistivity, of at least 70 pQ.cm, a low PTE and an optimal TCR in a temperature range from 20 to 50°C, while also exhibiting stability over time of their resistivity.
- the invention relates to a precision resistive alloy based on copper (Cu) for the manufacture of a precision resistor, characterized in that said alloy consists of, in % by mass:
- the proportion of Mn within the alloy is between 20.0 and 22.0% by mass;
- thermoelectric power with a value less than 2 pV/°C, preferably less than 1 pV/°C, more preferably still less than 0.5 pV/°C, and
- TCR resistance • a temperature coefficient of the TCR resistance, between 20 and 50°C, between -50 and +50 ppm/°C, preferably between -40 and +40 ppm/°C, and more preferably still between -20 and +20 ppm/°C.
- the invention also relates to a precision resistor comprising, on the one hand, a core obtained from a resistive alloy in accordance with the invention, and, on the other hand, copper connectors located on either side of said core and assembled, by welding, to the latter.
- the invention also relates to a first embodiment of a method for manufacturing a strip of precision resistive alloy based on copper in accordance with the invention and described above, said method comprising at least the following steps, taken in order:
- Such an alloy composition makes it possible to manufacture precision resistors having exceptional properties, in terms of both resistivity, but also TCR and PTE, and, moreover, to maintain stability of these properties in the temperature ranges to which said resistors are subjected, in use.
- Such an alloy composition makes it possible to manufacture electronic components having a resistivity considered to be particularly high, for such an alloy family, between 70.0 and 85.0 pQ.cm.
- Such resistivity values have not, until now, been achieved by alloys having a CuMnNi base and produced in the context of conventional melting processes, but only in the context of vacuum melting processes.
- the Mn/Ni ratio between the proportions of manganese and nickel in the alloy, must be between 3 and 5, making it possible to ensure an optimal PTE and, preferably, less than 1 pV/°C.
- the PTE reflects the appearance of a difference in electrical potential under the effect of a thermal gradient applied to the junctions of pairs of materials.
- the proportion of tin in the resistive alloy of the invention makes it possible to ensure obtaining a temperature coefficient TCR of the resistance between -50 and +50 ppm/°C, in a temperature range between 20 and 50°C.
- the alloy of the invention makes it possible to ensure stability of the temperature resistance, in the range of temperatures of use of a precision resistor obtained using said alloy.
- the proportion of Sn in the alloy of the invention is between 0.6 and 1.6% by mass, which further allows adjustment of the TCR and maintenance thereof in a range between -40 and +40 ppm/°C.
- the alloys of the invention each allow the obtaining of a TCR which is particularly stable and close to 0, in particular over a temperature range between 20 and 50°C.
- the composition of the precision resistive alloy of the invention also comprises, in addition to Cu, Mn, Ni and Sn, a proportion of silicon (Si) of between 0.02 and 0.15% by mass.
- the sum of the mass percentages (Sn + 4*Si) must be less than 2.0% and, more preferably still, this sum (Sn + 4*Si) is less than 1.6%.
- the proportion of Si within the precision resistive alloy of the invention must be less than 0.15% so as to avoid embrittlement thereof during a hot transformation step implemented during the process for producing a strip, described below, from said alloy.
- the present invention also relates to a method for manufacturing a strip of precision resistive alloy based on copper as described above, consisting of the elements Mn, Ni, Sn, possibly Si, in the proportions and respecting the Mn/Ni ratio mentioned, and possibly the Si+Sn criterion introduced where appropriate, the remainder of the alloy being Cu as well as the inevitable impurities.
- the method of the invention advantageously, does not require carrying out the melting and casting in a vacuum enclosure.
- a homogenization temperature of the alloy before transformation, not exceeding 800°C, allows the CuMnSn phases rich in Sn (more than 20% Sn) to be dissolved and thus avoid their fusion, which would be likely to cause decohesion and damage during transformation.
- the starting alloy incorporates a proportion of Si of between 0.02% and 0.15%, respecting the criterion Sn+0.4*Si ⁇ 2.0%, preferably ⁇ 1.6%
- the Si is introduced at the end of fusion, after introduction and fusion of the other constituent elements of the alloy, Cu, Mn, Ni and Sn.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Conductive Materials (AREA)
- Apparatuses And Processes For Manufacturing Resistors (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020257036035A KR20250164305A (ko) | 2023-03-29 | 2024-03-25 | 구리, 망간, 니켈 및 주석을 기반으로 한 정밀 저항 합금 |
| CN202480017720.0A CN120882891A (zh) | 2023-03-29 | 2024-03-25 | 基于铜、锰、镍及锡的精密电阻合金 |
| EP24712542.0A EP4689205A1 (fr) | 2023-03-29 | 2024-03-25 | Alliage résistif de précision à base de cuivre, de manganèse, de nickel et d'étain |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2303003 | 2023-03-29 | ||
| FR2303003A FR3147294B1 (fr) | 2023-03-29 | 2023-03-29 | Alliage résistif de précision à base de cuivre, de manganèse, de nickel et d’étain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024200375A1 true WO2024200375A1 (fr) | 2024-10-03 |
Family
ID=87974726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2024/057994 Ceased WO2024200375A1 (fr) | 2023-03-29 | 2024-03-25 | Alliage résistif de précision à base de cuivre, de manganèse, de nickel et d'étain |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4689205A1 (fr) |
| KR (1) | KR20250164305A (fr) |
| CN (1) | CN120882891A (fr) |
| FR (1) | FR3147294B1 (fr) |
| TW (1) | TWI883884B (fr) |
| WO (1) | WO2024200375A1 (fr) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019244842A1 (fr) * | 2018-06-20 | 2019-12-26 | 古河電気工業株式会社 | Matériau de résistance pour résistances, son procédé de production et résistance |
| US20200224293A1 (en) | 2013-06-19 | 2020-07-16 | Isabellenhuette Heusler Gmbh & Co. Kg | Resistor having a resistor element comprising resistance alloy with improved properties |
| WO2021200326A1 (fr) * | 2020-04-01 | 2021-10-07 | Koa株式会社 | Alliage pour résistance, et utilisation d'un alliage de résistance dans une résistance |
| WO2022030071A1 (fr) * | 2020-08-07 | 2022-02-10 | Koa株式会社 | Alliage de résistance destiné à être utilisé dans une résistance shunt, utilisation d'un alliage de résistance dans une résistance shunt, et résistance shunt utilisant un alliage de résistance |
-
2023
- 2023-03-29 FR FR2303003A patent/FR3147294B1/fr active Active
-
2024
- 2024-03-25 EP EP24712542.0A patent/EP4689205A1/fr active Pending
- 2024-03-25 WO PCT/EP2024/057994 patent/WO2024200375A1/fr not_active Ceased
- 2024-03-25 CN CN202480017720.0A patent/CN120882891A/zh active Pending
- 2024-03-25 KR KR1020257036035A patent/KR20250164305A/ko active Pending
- 2024-03-29 TW TW113111894A patent/TWI883884B/zh active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200224293A1 (en) | 2013-06-19 | 2020-07-16 | Isabellenhuette Heusler Gmbh & Co. Kg | Resistor having a resistor element comprising resistance alloy with improved properties |
| WO2019244842A1 (fr) * | 2018-06-20 | 2019-12-26 | 古河電気工業株式会社 | Matériau de résistance pour résistances, son procédé de production et résistance |
| WO2021200326A1 (fr) * | 2020-04-01 | 2021-10-07 | Koa株式会社 | Alliage pour résistance, et utilisation d'un alliage de résistance dans une résistance |
| WO2022030071A1 (fr) * | 2020-08-07 | 2022-02-10 | Koa株式会社 | Alliage de résistance destiné à être utilisé dans une résistance shunt, utilisation d'un alliage de résistance dans une résistance shunt, et résistance shunt utilisant un alliage de résistance |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4689205A1 (fr) | 2026-02-11 |
| FR3147294B1 (fr) | 2025-07-25 |
| TWI883884B (zh) | 2025-05-11 |
| KR20250164305A (ko) | 2025-11-24 |
| TW202449185A (zh) | 2024-12-16 |
| FR3147294A1 (fr) | 2024-10-04 |
| CN120882891A (zh) | 2025-10-31 |
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