CN110923503B - Low-temperature resistance alloy and preparation method thereof - Google Patents
Low-temperature resistance alloy and preparation method thereof Download PDFInfo
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- CN110923503B CN110923503B CN201911407314.2A CN201911407314A CN110923503B CN 110923503 B CN110923503 B CN 110923503B CN 201911407314 A CN201911407314 A CN 201911407314A CN 110923503 B CN110923503 B CN 110923503B
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0425—Copper-based alloys
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Abstract
The invention belongs to the technical field of new materials, and particularly relates to a low-temperature-drift-coefficient precision resistance alloy, wherein the content of Mg in the alloy is 1.0-3.0 wt%, the content of Mn in the alloy is 6.5-8.3 wt%, the content of Cr in the alloy is 0.3-0.5 wt%, and the balance is Cu. The invention obtains the optimal component proportion of Mg and Cr in the copper-manganese alloy by adjusting the relative proportion of the Mg and Cr elements in the copper-manganese alloy, so that the alloy has extremely small temperature drift coefficient.
Description
Technical Field
The invention belongs to the technical field of new materials, and particularly relates to a low-temperature-drift-coefficient precision resistance alloy.
Background
The manganese-copper series precision resistance alloy is a key material for preparing high-precision electrical instruments, and is widely applied to the fields of intelligent electric meters, automobile manufacturing, electronic and electrical measuring instrument manufacturing, such as shunts in intelligent electric meters and automobile circuits. The precision resistance alloy mainly includes copper-manganese series (such as 6J13, 6J12 and 6J8), copper-nickel series (6J40) and nickel-chromium series (6J22, Karma). The early application of the precision resistance alloy in the industrial field is mainly used as an ammeter shunt, and along with the development of times and science and technology, the precision resistance alloy is currently applied to the fields of automobile manufacturing, intelligent ammeters, photovoltaic and wind power generation, new energy automobile power management and aviation and aerospace. The traditional automobile body current signal mainly adopts an indirect detection mode based on a current mutual inductance principle or a Hall effect, and has the defects of large volume, high error and poor linearity and temperature characteristics. The current detection method based on the shunt has the advantages of large power, small volume, high precision and low cost in the detection of the current signal of the automobile body, so the current detection method is rapidly popularized in the field of automobile manufacturing and replaces the traditional current transformer and Hall sensor.
However, the temperature drift coefficient of the existing precise manganin resistance material 6J13 alloy ranges from 20 PPM/DEG C to 50 PPM/DEG C, the working current of an electronic control system of an automobile body ranges from 1A to 100A, strong impact current of 200A to 300A exists in a short time, and the highest current signal sampling error of about 0.5 percent can be caused. The huge current and temperature change in the automobile body circuit form great challenges to the use precision and the use temperature range of the existing resistance alloy material, so how to further reduce the temperature drift coefficient of the manganese-copper alloy and improve the current signal sampling precision of the shunt through an alloying way is a problem to be solved urgently when the precision resistance alloy shunt is applied to the automobile circuit. Aiming at the problems of overhigh temperature drift coefficient and higher current signal sampling precision of the existing precision resistance alloy, the invention adopts elements such as Mg, Cr and the like to partially replace Mn element in the traditional manganese-copper precision resistance alloy, remarkably lightens the forming trend of 'K-state' in the Cu-Mn series precision resistance alloy and greatly reduces the temperature drift coefficient of the material.
Disclosure of Invention
Technical problem to be solved by the invention
In the temperature range of-40 to 120 ℃, the temperature drift coefficient of the existing copper-manganese series precision resistance alloy is too high, so that the large-scale application of the copper-manganese series precision resistance alloy in an automobile circuit is limited. The invention aims to provide a novel low-temperature-drift Cu-Mn-Mg-Cr precision resistance material, and the Cu-Mn-Mg-Cr alloy designed by the invention has a mild temperature drift curve, and the temperature drift coefficient of the Cu-Mn-Mg-Cr alloy can be controlled within the range of 3.0-6.0 PPM/DEG C.
Means for solving the technical problem
Aiming at the problems, the invention provides a low-temperature-bleaching precision resistance alloy and a preparation method thereof.
According to an embodiment of the present invention, there is provided a precision resistance alloy, wherein the alloy contains 1.0 to 3.0wt% of an Mg element, 6.5 to 8.3wt% of an Mn element, 0.3 to 0.5wt% of a Cr element, and the balance Cu.
In one embodiment, the temperature drift coefficient of the alloy is 3.0-6.0 PPM/DEG C.
According to a second aspect of the present invention, there is provided a method of preparing a low temperature resistance alloy, comprising the steps of:
1) sintering and molding alloy powder in a certain proportion in a vacuum environment to prepare a sintered blank;
2) carrying out solution treatment on the sintered blank;
the alloy powder comprises magnesium powder, manganese powder, chromium powder and copper powder, wherein the content of Mg powder is 1.0-3.0 wt%, the content of Mn powder is 6.5-8.3 wt%, the content of Cr powder is 0.3-0.5 wt%, and the balance is Cu powder.
In one embodiment, in the step 1), after mixing, the alloy powder is sintered and formed under an external pressure, the external pressure is controlled to be 105 to 240MPa, the sintering temperature is controlled to be 900 to 950 ℃, and the temperature is kept for 5 to 6 hours.
In one embodiment, in the step 2), the sintered blank is hot extruded into a round bar, and then solution treatment is performed in a vacuum heat treatment furnace, wherein the solution temperature is 600-700 ℃, and the heat preservation time is 6-8 hours.
In one embodiment, the alloy is cooled to room temperature after solution treatment, and the cooling may be water cooling.
According to a second aspect of the present invention there is provided a resistive alloy prepared according to the method described above.
The invention has the advantages of
The invention obtains the optimal component proportion of Mg and Cr in the copper-manganese alloy by adjusting the relative proportion of the Mg and Cr elements in the copper-manganese alloy, so that the alloy has extremely small temperature drift coefficient.
The advanced features of the invention will become apparent from the following description of exemplary embodiments.
Detailed Description
One embodiment of the present disclosure will be specifically described below, but the present disclosure is not limited thereto.
Based on the principle of superposition of resistivity of solid solution conductors:
(wherein ρMIs the resistivity of the matrix material, psSolvent element resistivity, T is temperature), solid solution of different alloying elements in a metal matrix can result in different temperature drift tendencies. The invention obtains the optimal component proportion of Mg and Cr in the copper-manganese alloy by adjusting the relative proportion of the Mg and Cr elements in the copper-manganese alloy, so that the alloy has extremely small temperature drift coefficient.
The specific process comprises the following steps: under a vacuum environment, fully mixing magnesium powder, manganese powder, chromium powder and copper powder in a certain proportion, wherein the weight percentage of Mg is 1.0-3.0 wt%, the weight percentage of Mn element is 6.5-8.3 wt%, the weight percentage of Cr element is 0.3-0.5 wt%, and the balance is Cu;pressing the powder and sintering to obtain
The external pressure of the billet is controlled within the range of 105-240 MPa, the sintering temperature is controlled within the range of 900-950 ℃, and the temperature is kept for 5-6 hours; then the sintered billet is extruded to
The extrusion temperature of the bar is 950-1050 ℃. And finally carrying out solid solution treatment in a vacuum heat treatment furnace, wherein the solid solution temperature is 600-700 ℃, the heat preservation time is 6-8 hours, and cooling to room temperature after water cooling.
Example one
An alloy containing 1.0 wt% of Mg, 8.3wt% of Mn, 0.5wt% of Cr and the balance of Cu is sintered and formed at 900 ℃ under 240MP pressure and then hot-extruded
And finally carrying out solid solution treatment in a vacuum heat treatment furnace, wherein the solid solution temperature is 700 ℃, the heat preservation time is 6 hours, and water cooling is carried out to the room temperature. The Cu-Mn-Mg-Cr alloy with the components and the process route is prepared
The temperature drift curve of the wire is tested in a silicon oil cooling medium at the temperature range of-40-120 ℃, the testing process and the temperature drift coefficient are calculated according to GB/T6148-.
Example two
An alloy containing 3.0wt% of Mg, 6.5 wt% of Mn, 0.3 wt% of Cr and the balance of Cu is sintered at 930 ℃ under 105MP pressure and then hot-extruded
And finally carrying out solid solution treatment in a vacuum heat treatment furnace, wherein the solid solution temperature is 650 ℃, the heat preservation time is 7 hours, and water cooling is carried out to the room temperature. The Cu-Mn-Mg-Cr alloy with the components and the process route is prepared
The temperature drift curve of the wire is tested in a silicon oil cooling medium at the temperature range of-40-120 ℃, the testing process and the temperature drift coefficient are calculated according to GB/T6148-.
EXAMPLE III
An alloy containing 2.2 wt% of Mg, 7.3 wt% of Mn, 0.4 wt% of Cr and the balance of Cu is sintered and formed at 950 ℃ under 180MP pressure and then hot-extruded
And finally carrying out solid solution treatment in a vacuum heat treatment furnace, wherein the solid solution temperature is 600 ℃, the heat preservation time is 8 hours, and water cooling is carried out to the room temperature. The Cu-Mn-Mg-Cr alloy with the components and the process route is prepared
The temperature drift curve of the wire is tested in a silicon oil cooling medium at the temperature range of-40-120 ℃, the testing process and the temperature drift coefficient are calculated according to GB/T6148-.
Industrial applicability
The alloy material disclosed by the invention is low in temperature drift coefficient, and is suitable for being applied to the fields of intelligent electric meters, automobile manufacturing, electronics and electric measuring instrument manufacturing.
The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. A Cu-Mn series precision alloy is characterized in that 1.0-3.0 wt% of Mg element and 0.3-0.5 wt% of Cr element are added on the basis of low manganese copper alloy, and the temperature drift coefficient of the alloy is 3.0-6.0 PPM/DEG C;
the preparation method of the precision alloy comprises the following steps,
1) under a vacuum environment, sintering and forming alloy powder with the Mg powder content of 1.0-3.0 wt%, the Mn powder content of 6.5-8.3 wt%, the Cr powder content of 0.3-0.5 wt% and the balance being Cu powder, controlling the external pressure at 105-240 MPa, controlling the sintering temperature within the range of 900-950 ℃, and preserving heat for 5-6 hours to obtain a sintered blank;
2) carrying out solution treatment on the sintered blank, carrying out hot extrusion on the sintered blank to form a round bar, then carrying out solution treatment in a vacuum heat treatment furnace, wherein the solution temperature is 600-700 ℃, the heat preservation time is 6-8 hours, and cooling the alloy to room temperature after the solution treatment.
2. The method of preparing a precision resistive alloy of claim 1, wherein:
1) under a vacuum environment, sintering and forming alloy powder with the Mg powder content of 1.0-3.0 wt%, the Mn powder content of 6.5-8.3 wt%, the Cr powder content of 0.3-0.5 wt% and the balance being Cu powder, controlling the external pressure at 105-240 MPa, controlling the sintering temperature within the range of 900-950 ℃, and preserving heat for 5-6 hours to obtain a sintered blank;
2) carrying out solution treatment on the sintered blank, carrying out hot extrusion on the sintered blank to form a round bar, then carrying out solution treatment in a vacuum heat treatment furnace, wherein the solution temperature is 600-700 ℃, the heat preservation time is 6-8 hours, and cooling the alloy to room temperature after the solution treatment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3772095A (en) * | 1971-11-05 | 1973-11-13 | Olin Corp | Copper base alloys |
| JPH0372045A (en) * | 1989-08-14 | 1991-03-27 | Nippon Mining Co Ltd | High strength and high conductivity copper alloy having excellent adhesion for oxidized film |
| JP2918961B2 (en) * | 1990-03-01 | 1999-07-12 | 古河電気工業株式会社 | High-strength copper alloy with high workability |
| JP5654911B2 (en) * | 2011-03-17 | 2015-01-14 | 株式会社Ｓｈカッパープロダクツ | Rolled copper foil for lithium ion secondary battery current collector |
| JP2014118580A (en) * | 2012-12-13 | 2014-06-30 | Kobelco & Materials Copper Tube Inc | Corrosion resistant copper alloy tube |
| JP6270417B2 (en) * | 2013-11-01 | 2018-01-31 | Ｊｘ金属株式会社 | Copper alloy sheet with excellent conductivity and stress relaxation properties |
| JP5847787B2 (en) * | 2013-11-26 | 2016-01-27 | Jx日鉱日石金属株式会社 | Copper alloy sheet with excellent conductivity and stress relaxation properties |
| CN107345280A (en) * | 2016-05-06 | 2017-11-14 | 华为技术有限公司 | A kind of method for preparing Cu alloy material, Cu alloy material and equipment |
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