WO2018150705A1 - 抵抗材用銅合金材料及びその製造方法並びに抵抗器 - Google Patents
抵抗材用銅合金材料及びその製造方法並びに抵抗器 Download PDFInfo
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- WO2018150705A1 WO2018150705A1 PCT/JP2017/044780 JP2017044780W WO2018150705A1 WO 2018150705 A1 WO2018150705 A1 WO 2018150705A1 JP 2017044780 W JP2017044780 W JP 2017044780W WO 2018150705 A1 WO2018150705 A1 WO 2018150705A1
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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
- C22C9/02—Alloys based on copper with tin 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
- 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
- C22C9/00—Alloys based on copper
- C22C9/06—Alloys based on copper with nickel or cobalt 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
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C13/00—Resistors not provided for elsewhere
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
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- 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
Definitions
- the present invention relates to a copper alloy material for a resistance material, a manufacturing method thereof, and a resistor.
- the metal material of the resistor used for the resistor has a small resistance temperature coefficient (hereinafter sometimes referred to as “TCR”) so that the resistance of the resistor is stabilized even when the environmental temperature changes.
- T in the formula is a test temperature (° C.)
- T 0 is a reference temperature (° C.)
- R is a resistance value ( ⁇ ) at the test temperature T
- R 0 is a resistance value ( ⁇ ) at the test temperature T 0 .
- Cu—Mn—Ni alloys and Cu—Mn—Sn alloys have a very small TCR and are therefore widely used as metal materials constituting resistance materials (see, for example, Patent Document 1).
- a resistance material and a conductive material made of oxygen-free copper or the like are often welded.
- electron beam welding has been generally used for welding the resistance material and the conductive material, but switching to laser welding has been performed in order to reduce manufacturing costs.
- laser welding it is known that if the laser beam is reflected on the surface of the work piece, the weldability is lowered, so that it is advantageous that the surface roughness of the work piece is rough.
- resistors have also been miniaturized, and the thickness of the resistor material has become thinner.
- the influence of the surface properties (surface roughness, etc.) of the resistance material on the electrical resistivity has been neglected and has been ignored.
- the thickness of the resistance material becomes thinner, the influence has become so large that it cannot be ignored. That is, in the past, a micrometer was used to measure the thickness of the resistance material from the viewpoint of workability, and the cross-sectional area was obtained from the measured value. Since the difference between the apparent cross-sectional area of the resistance material calculated from the value and the true cross-sectional area becomes large, the measured value of the electrical resistivity becomes larger than the true electrical resistivity.
- the size of the resistance material necessary for manufacturing the resistor and the size calculated from the measured value of the electrical resistivity, which causes a problem in the design of the resistor. .
- the copper alloy material for a resistance material is a copper alloy material for a resistance material containing 2% by mass to 14% by mass of manganese, with the balance being made of copper and inevitable impurities.
- the thickness t when measured with a meter is a rolled plate having a thickness of 0.04 mm or more, and the roughness curve in the direction orthogonal to the rolling direction was obtained by the contact-type surface roughness measurement method for the plate surface of the rolled plate.
- the maximum height Rz is 0.3 ⁇ m or more and 1.5 ⁇ m or less, the average length RSm of the roughness curve element is 0.03 mm or more and 0.15 mm or less, and the value of the parameter A calculated by the following formula Is from 0.002 to 0.04.
- Y max in the following equation is the height of the highest peak in the extracted portion where only the reference length l is extracted from the roughness curve in the direction in which the average line extends.
- Y i and y i + 1 in the following formulas are the i-th and i + 1-th counted from one end in the direction in which the average line of the extracted portion extends when the measurement points of the roughness curve existing in the extracted portion are used as reference points, respectively. Is the height of the second reference point.
- x i and x i + 1 are lengths in the direction in which the average line extends between one end in the direction in which the average line of the extracted portion extends and the i th and i + 1 th reference points.
- N in the following formula is the number of the reference point counted from one end in the direction in which the average line of the sampling part extends is the farthest from the one end in the direction in which the average line of the sampling part extends. It is a numerical value that represents.
- T in the following mathematical formula is the thickness of the rolled sheet when measured with a contact-type film thickness meter.
- a method for producing a copper alloy material for a resistance material according to another aspect of the present invention is a method for producing a copper alloy material for a resistance material according to the above aspect, wherein the copper alloy ingot is subjected to cold rolling.
- a cold rolling process that forms a sheet into a rolled sheet, a recrystallization annealing process that applies recrystallization annealing to the rolled sheet obtained in the cold rolling process, and a recrystallization annealing process that performs recrystallization annealing.
- a gist of a resistor according to another aspect of the present invention is that at least a part of the resistor is composed of the copper alloy material for a resistance material according to the above aspect.
- the copper alloy material for resistance material of the present invention is easy to obtain an accurate measurement value in the measurement of electric resistivity and has good laser weldability.
- the method for producing a copper alloy material for a resistance material of the present invention can produce a copper alloy material for a resistance material, which is easy to obtain an accurate measurement value in the measurement of electrical resistivity and has good laser weldability.
- the resistor of the present invention has an accurate electrical resistance value and is easy to manufacture.
- the copper alloy material for resistance material of this embodiment contains manganese (Mn) 2 mass% or more and 14 mass% or less, and remainder consists of copper (Cu) and an unavoidable impurity.
- the copper alloy material for resistance materials of this embodiment is a rolled sheet whose plate thickness t when measured with a contact-type film thickness meter is 0.04 mm or more.
- the maximum height Rz is 0.3 ⁇ m or more and 1.5 ⁇ m or less
- the average length RSm of the curve elements is 0.03 mm or more and 0.15 mm or less
- the value of the parameter A calculated by the following mathematical formula is 0.002 or more and 0.04 or less.
- Y max in the following equation is the height of the highest peak in the extracted portion where only the reference length l is extracted from the roughness curve in the direction in which the average line extends.
- Y i and y i + 1 in the following formulas are the i-th and i + 1-th counted from one end in the direction in which the average line of the extracted portion extends when the measurement points of the roughness curve existing in the extracted portion are used as reference points, respectively. Is the height of the second reference point.
- x i and x i + 1 are lengths in the direction in which the average line extends between one end in the direction in which the average line of the extracted portion extends and the i th and i + 1 th reference points.
- N in the following formula is the number of the reference point counted from one end in the direction in which the average line of the sampling part extends is the farthest from the one end in the direction in which the average line of the sampling part extends. It is a numerical value that represents.
- T in the following mathematical formula is the thickness of the rolled sheet when measured with a contact-type film thickness meter.
- the copper alloy material for resistance material of this embodiment has the maximum height Rz, the average length RSm of the roughness curve element, the parameter A (hereinafter, these may be collectively referred to as “surface properties”). ) Is appropriately controlled, it is easy to obtain an accurate electrical resistivity in the measurement of electrical resistivity and has good laser weldability. Therefore, the copper alloy material for resistance material of this embodiment is suitable as a metal material which comprises the resistance material used for resistors, such as a shunt resistor, for example.
- the resistor at least partly composed of the copper alloy material for resistance material of the present embodiment is an accurate electrical device. It has a resistance value and is easy to manufacture. Below, the copper alloy material for resistors and the resistor of the present embodiment will be described in more detail.
- the copper alloy material for resistance material of the present embodiment contains 2% by mass or more and 14% by mass or less of manganese, and the balance is made of copper and inevitable impurities.
- the content of manganese is more preferably 6% by mass or more and 14% by mass or less. If the manganese content is less than 2% by mass, the TCR may increase, and the material strength may decrease, and the desired surface properties may not be obtained during production. On the other hand, if the manganese content exceeds 14% by mass, the electrical resistivity may be increased, and the corrosion resistance and manufacturability may be decreased. Further, the material strength becomes high, and there is a possibility that a desired surface property cannot be obtained at the time of production.
- the copper alloy material for resistance material of this embodiment may further contain alloy components other than manganese.
- alloy components that can be contained in the copper alloy material for resistance material of the present embodiment are not particularly limited.
- nickel (Ni) exceeds 0 mass% and is 3 mass% or less
- tin (Sn) is 0 mass%.
- At least one of nickel and tin is more preferably contained.
- the nickel content is more preferably 0.001% by mass or more and 3% by mass or less
- the tin content is more preferably 0.001% by mass or more and 4% by mass or less.
- the copper alloy material for resistance material of the present embodiment is a rolled plate having a thickness t of 0.04 mm or more when measured with a contact-type film thickness meter as described above.
- Examples of the contact-type film thickness meter include a micrometer. From the plate thickness t measured with the contact-type film thickness meter, the apparent cross-sectional area of the rolled plate (or the resistance material produced from the copper alloy material for resistance material) can be calculated. In order to obtain the true cross-sectional area of the rolled plate (or a resistance material manufactured from a copper alloy material for resistance material), it is necessary to consider the surface properties of the plate surface of the rolled plate.
- the thickness t of the rolled sheet is less than 0.04 mm, the influence of the surface properties on the measurement of the electrical resistivity is increased, and it may be difficult to accurately measure the electrical resistivity. Further, laser welding becomes difficult, and it may be difficult to have good laser weldability.
- the plate thickness t of the rolled sheet As the plate thickness t of the rolled sheet is increased, the influence of the surface property on the measurement of the electrical resistivity is reduced, so that the electrical resistivity can be easily measured with high accuracy and the laser weldability is improved.
- the thickness of the resistance material has been reduced with the miniaturization of the resistor, the plate thickness t at which the influence of the surface property on the measurement of the electrical resistivity becomes remarkable is about 0.3 mm.
- the surface property of the copper alloy material for resistance material of the present embodiment is as described above, and the contact surface roughness measurement is performed on the roughness curve in the direction orthogonal to the rolling direction.
- the maximum height Rz is 0.3 ⁇ m or more and 1.5 ⁇ m or less
- the average length RSm of the roughness curve element is 0.03 mm or more and 0.15 mm or less, and is calculated by the above formula.
- the value of parameter A is 0.002 or more and 0.04 or less.
- the maximum height Rz is more preferably 0.5 ⁇ m or more and 1.5 ⁇ m or less
- the average length RSm of the roughness curve element is more preferably 0.03 mm or more and 0.1 mm or less.
- the calculated value of parameter A is more preferably 0.004 or more and 0.028 or less.
- the maximum height Rz, the average length RSm of the roughness curve element, and the parameter A are all within the above numerical range, accurate measurement values can be easily obtained in the measurement of electrical resistivity and good laser weldability.
- the copper alloy material for resistance material having When the maximum height Rz is less than 0.3 ⁇ m, the plate surface of the rolled plate is too smooth and the laser weldability may be reduced. On the other hand, when the maximum height Rz is more than 1.5 ⁇ m, the surface of the rolled plate becomes rough, and the electrical resistivity may not be measured accurately.
- the average length RSm of the roughness curve element When the average length RSm of the roughness curve element is less than 0.03 mm, there are too many irregularities present on the surface of the rolled plate, and thus there is a possibility that the electrical resistivity cannot be measured accurately. On the other hand, when the average length RSm of the roughness curve element is more than 0.15 mm, there are too few irregularities on the plate surface of the rolled plate, so that the laser weldability may be lowered.
- the above equation for calculating the parameter A represents the relationship between the apparent cross-sectional area of the rolled sheet and the cross-sectional area that increases from the true cross-sectional area due to the influence of the surface properties of the plate surface.
- a larger value means that the difference between the apparent cross-sectional area and the true cross-sectional area caused by the influence of the surface properties is larger.
- FIG. 1 is a schematic cross-sectional view showing the surface properties of the rolled sheet of this embodiment, and the wavy line extending in the X-axis direction is the roughness curve of the surface of the rolled sheet.
- the lower side of the roughness curve shows the inside of the rolled plate, and the upper side shows the outside of the rolled plate.
- a plurality of peaks and a plurality of valleys exist in the extracted portion in which only the reference length l is extracted from the roughness curve in the X-axis direction (that is, the direction in which the average line of the roughness curve extends).
- any measurement point by contact-type surface roughness measurement performed for obtaining a roughness curve is defined as a reference point T.
- 8000 measurement points (height information) are obtained at intervals of 0.0005 mm.
- reference points T 1 , T 2 , T 3 , T 4 ,..., T n-1 are sequentially from one end (left end) in the X-axis direction to the other end (right end) of the extracted portion.
- T n exists.
- the peak that is farthest from one end (left end) in the X-axis direction of the extracted portion is the highest peak, so that the peak of this peak, that is, the reference point T n-1 is The reference point T max is obtained.
- the peak of the mountain and the bottom of the valley are displayed as reference points.
- the reference point is not limited to the peak of the mountain or the bottom of the valley.
- a point located between the apex and the bottom of the valley may be the reference point.
- y 1 , y 2 , y 3 , y 4 ,..., Y n ⁇ 1 (y max ), y n indicate the height of the reference point (position in the Y-axis direction).
- x n are one end (left end) in the X-axis direction of the extracted portion and its reference point. Is the length in the X-axis direction. Therefore, “x i + 1 ⁇ x i ” in the above formula is the distance in the X-axis direction between two adjacent reference points, and means the height of the trapezoidal portion with hatching in FIG.
- (y max ⁇ y i )” in the above formula represents the Y axis between the reference point T max and the reference point T max that is the i th position counted from one end (left end) in the X axis direction of the extracted portion. It is a distance in the direction, and means the length of the bottom side of the trapezoidal portion with hatching in FIG. Therefore, “(y max ⁇ y i ) + (y max ⁇ y i + 1 )” in the above formula means “the sum of the upper base and the lower base” of the trapezoidal portion shown in FIG.
- parameter A If the value of parameter A is less than 0.002, the plate surface of the rolled plate is too smooth and the laser weldability may be reduced. On the other hand, if the value of parameter A exceeds 0.04, the difference between the apparent cross-sectional area and the true cross-sectional area becomes large, and thus there is a possibility that the electrical resistivity cannot be measured accurately.
- the copper alloy material for resistance material of the present embodiment is obtained by cold rolling a copper alloy ingot to form a plate into a rolled plate, and re-rolling the rolled plate obtained in the cold rolling step. Recrystallization annealing step for crystal annealing, and surface polishing for buffing using abrasive grains having a grain size of # 800 or more and # 2400 or less on the surface of the rolled plate subjected to recrystallization annealing in the recrystallization annealing step And a process comprising the steps.
- the copper alloy material for a resistance material of the present embodiment it is possible to manufacture the copper alloy material for a resistance material of the present embodiment, which is easy to obtain an accurate measurement value in the measurement of electric resistivity and has good laser weldability.
- the more specific example of the manufacturing method of the copper alloy material for resistance materials of this embodiment is shown as an example.
- the conditions for the heat treatment in the homogenization heat treatment step may be set as appropriate according to the alloy composition. As an example, a condition of 800 ° C. to 950 ° C. for 10 minutes to 10 hours can be given. If the heating temperature is too high or the heating time is too long, the workability of the copper alloy material for resistance material may be reduced. On the other hand, if the heating temperature is too low or the heating time is too short, homogenization of the alloy components may be insufficient.
- the ingot homogenized by the homogenization heat treatment step is hot-rolled to form the ingot into a plate-like material (hot rolling step). Since the ingot immediately after the homogenization heat treatment step is in a state of being heated to a high temperature, it is preferable that the ingot is continuously transferred to the hot rolling step and hot rolling is performed. When the hot rolling is finished, the ingot plate is cooled to room temperature. Since the oxide film is formed on the surface of the plate-like material after the hot rolling process, the oxide film is removed (face cutting process).
- cold rolling process is performed on the plate-like material from which the oxide film has been removed (cold rolling process).
- the plate-like material is cold-rolled to reduce the plate thickness to obtain a rolled plate.
- the rolling direction in the cold rolling process is the same as the rolling direction in the hot rolling process.
- the processing rate of cold rolling is not particularly limited, it can be, for example, 50% or more. If the processing rate in the cold rolling process is 50% or more, the material structure obtained up to the hot rolling process is sufficiently refined by annealing under appropriate conditions in the subsequent recrystallization annealing process. Therefore, the crystal grain size finally obtained does not become too large and tends to be an appropriate size.
- the rolled plate obtained in the cold rolling process is heat-treated and subjected to recrystallization annealing (recrystallization annealing process).
- the heat treatment conditions in the recrystallization annealing step may be set as appropriate according to the alloy composition and the like. As an example, there may be mentioned conditions of 350 ° C. or more and 700 ° C. or less and 10 seconds or more and 10 hours or less. If the heating temperature is too high or the heating time is too long, the material structure obtained up to the hot rolling process cannot be sufficiently refined, and the crystal grain size finally obtained cannot be reduced. There is a fear.
- the heating temperature is too low or the heating time is too short, a recrystallized structure may not be obtained, or the recrystallized structure may be too small and the finally obtained crystal grain size may be small.
- a batch heat treatment in which the rolled plate is put in a furnace and the temperature is raised may be used, or a running heat treatment in which the rolled plate is continuously passed through the heated furnace may be used.
- buff polishing using abrasive grains having a grain size of # 800 or more and # 2400 or less is performed on the surface of the rolled plate subjected to the recrystallization annealing in the recrystallization annealing process (surface polishing process).
- the polishing direction of buffing that is, the relative movement direction between the plate surface of the rolled plate and the buff is the same as the rolling direction in the cold rolling process and the rolling direction in the hot rolling process. If the grain size of the abrasive grains is less than # 800, the surface of the rolled plate becomes too rough, and the desired surface properties may not be obtained. On the other hand, if the grain size of the abrasive grains exceeds # 2400, the plate surface of the rolled plate becomes too smooth, and the desired surface properties may not be obtained.
- cold rolling with a processing rate exceeding 0% and 50% or less is performed on the rolled plate whose plate surface has been polished in the surface polishing step (re-cold rolling step).
- the rolled plate is cold-rolled to further reduce the plate thickness to a desired thickness. If the processing rate in the re-cold rolling process is more than 50%, the unevenness of the plate surface formed in the surface polishing process may be crushed by cold rolling, so the desired surface properties may not be obtained. is there.
- this re-cold rolling process does not need to be performed. That is, the re-cold rolling step is not performed, and the processing rate of the processing performed after the surface polishing step may be 0%.
- the rolling direction of the re-cold rolling process is the same as the rolling direction of the cold rolling process, the rolling direction of the hot rolling process, and the buffing polishing direction. And after manufacture of a rolled sheet, the roughness curve of the direction orthogonal to a rolling direction is acquired about the sheet surface, but this rolling direction is the rolling direction of the cold rolling process performed before a surface polishing process. Or the rolling direction of a re-cold rolling process is meant.
- a rolled sheet having the above surface properties can be manufactured by a manufacturing method including the steps as described above.
- the above surface properties are obtained by the surface polishing step and the re-cold rolling step.
- the cold rolling step and the recrystallization annealing step performed before the surface polishing step may be performed once each, or may be repeated a plurality of times before performing the surface polishing step. If the horizontal continuous casting method is adopted in the casting process and the ingot is formed into a plate-like material in the casting process, the homogenizing heat treatment process and the hot rolling process can be omitted.
- this embodiment shows an example of this invention and this invention is not limited to this embodiment.
- various changes or improvements can be added to the present embodiment, and forms to which such changes or improvements are added can also be included in the present invention.
- An ingot having a predetermined alloy composition is manufactured by casting (casting process), and heat treatment is performed at 800 ° C. to 950 ° C. for 10 minutes to 10 hours to homogenize alloy components (homogenization heat treatment process). It was formed into a plate shape by hot rolling and water-cooled (hot rolling process). Next, after chamfering the plate-like material obtained by hot rolling to remove the oxide film on the surface (facing step), the plate-like material is cold-rolled at a processing rate of 50% or more to obtain a plate thickness. Thinned into a rolled sheet (cold rolling process).
- this rolled sheet is heat-treated under conditions of 350 ° C. or higher and 700 ° C. or lower for 10 seconds or longer and 10 hours or shorter and subjected to recrystallization annealing (recrystallization annealing step), and then buffing using abrasive grains is rolled. It gave to the board surface of a board (surface grinding
- the alloy composition is as shown in Tables 1 and 2, but the balance other than the alloy components shown in Tables 1 and 2 is copper and inevitable impurities.
- Tables 1 and 2 show the grain sizes of the abrasive grains used in the surface polishing step, the cold rolling processing rate in the re-cold rolling step, and the plate thickness measured by the contact-type film thickness meter of the obtained rolled plate. As shown. Table 1 shows examples when various alloy compositions are changed, and Table 2 shows examples when various conditions of the surface polishing step and the re-cold rolling step are changed. The manufacturing conditions in Table 1 are more preferable than the manufacturing conditions in Table 2.
- a probe having a diameter of 2 ⁇ m was brought into contact with the plate surface of the rolled plate, and the probe was slid in a direction perpendicular to the rolling direction under the conditions of a probe sliding distance of 4 mm and a sliding speed of 0.1 mm / s.
- a roughness curve was obtained by obtaining 8000 measurement points (height information) at intervals of 0.0005 mm.
- the cut-off length is 0.8 mm.
- the surface properties of the rolled plate after mirror polishing are such that the maximum height Rz is 0.1 to 0.3 ⁇ m, the average length RSm of the roughness curve element is 0.2 to 0.5 mm, and the parameters The value of A was 0.001 to 0.002.
- the rolled plates of Examples 1 to 27 have a maximum height Rz of 0.3 ⁇ m or more and 1.5 ⁇ m or less, and an average length RSm of the roughness curve element of 0.2 mm. Since it is 03 mm or more and 0.15 mm or less and the value of parameter A is 0.002 or more and 0.04 or less, it is easy to obtain an accurate measurement value in the measurement of electric resistivity and has good laser weldability. It was.
- the rolled sheets of Comparative Examples 1 and 2 are examples in which the alloy composition is outside the scope of the present invention, but the maximum height Rz, the average length RSm of the roughness curve element, and the parameter A Since any of the values is out of the above numerical range, it is difficult to obtain an accurate measurement value in the measurement of electric resistivity, or laser weldability is poor.
- the rolled sheets of Comparative Examples 3 to 6, Comparative Examples 8 to 12, and Comparative Example 14 are examples in which the production conditions are outside the scope of the present invention, but the maximum height Rz and the average length RSm of the roughness curve element , And the value of parameter A is out of the above numerical range, it is difficult to obtain an accurate measurement value in the measurement of electrical resistivity, or laser weldability is poor.
- the rolled plates of Comparative Examples 7 and 13 had poor laser weldability because the plate thickness was outside the range of the present invention. Moreover, since the value of the parameter A is out of the above numerical range, it is difficult to obtain an accurate measurement value in the measurement of electrical resistivity.
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Abstract
Description
本発明の他の態様に係る抵抗器は、上記一態様に係る抵抗材用銅合金材料で少なくとも一部分が構成されたことを要旨とする。
本発明の抵抗材用銅合金材料の製造方法は、電気抵抗率の測定において正確な測定値が得られやすく且つ良好なレーザ溶接性を有する抵抗材用銅合金材料を製造することができる。
本発明の抵抗器は、正確な電気抵抗値を有し且つ製造が容易である。
以下に、本実施形態の抵抗材用銅合金材料及び抵抗器について、さらに詳細に説明する。
上記の含有可能な他の合金成分のうちニッケル及び錫の少なくとも一方は含有されていることがより好ましい。ニッケルの含有量は0.001質量%以上3質量%以下であることがより好ましく、錫の含有量は0.001質量%以上4質量%以下であることがより好ましい。
ただし、最大高さRzは0.5μm以上1.5μm以下であることがより好ましく、粗さ曲線要素の平均長さRSmは0.03mm以上0.1mm以下であることがより好ましく、上記数式により算出されるパラメータAの値は0.004以上0.028以下であることがより好ましい。
最大高さRzが0.3μm未満である場合は、圧延板の板面が平滑すぎて、レーザ溶接性が低下するおそれがある。一方、最大高さRzが1.5μm超過である場合は、圧延板の板面が粗くなり、電気抵抗率を正確に測定できないおそれがある。
以下に、本実施形態の抵抗材用銅合金材料の製造方法のより具体的な例を、一例として示す。
また、再冷間圧延工程の圧延方向は、冷間圧延工程の圧延方向、熱間圧延工程の圧延方向、及びバフ研磨の研磨方向と同一方向とする。そして、圧延板の製造後に、その板面について、圧延方向に対して直交する方向の粗さ曲線を取得するが、この圧延方向とは、表面研磨工程の前に行う冷間圧延工程の圧延方向又は再冷間圧延工程の圧延方向を意味する。
所定の合金組成を有する鋳塊を鋳造により製造し(鋳造工程)、800℃以上950℃以下で10分間以上10時間以下の熱処理を施して合金成分を均質化した後に(均質化熱処理工程)、熱間圧延により板状に成形し水冷した(熱間圧延工程)。次に、熱間圧延により得た板状物に面削を施して表面の酸化皮膜を除去した後に(面削工程)、50%以上の加工率で板状物を冷間圧延し板厚を薄化して圧延板とした(冷間圧延工程)。
<表面性状の評価について>
圧延板の板面について、JIS B0601(2001)に規定された方法に準じる方法(接触式表面粗さ測定法)により表面粗さの測定を行い、圧延方向に対して直交する方向の粗さ曲線を取得して、最大高さRz及び粗さ曲線要素の平均長さRSmを得るとともに、粗さ曲線を解析して、上記数式により算出されるパラメータAの値を得た。
圧延板の板面に鏡面研磨を施し、鏡面研磨前後の圧延板それぞれについて、JIS C2525に規定された方法に準じる方法(四端子法)により、20℃における電気抵抗率を測定した。圧延板の板厚はマイクロメータで測定した。そして、鏡面研磨前後の電気抵抗率の差が2%以下であった場合は、電気抵抗率の測定において正確な測定値が得られやすいと判定し、表1においては「○」印で示した。一方、鏡面研磨前後の電気抵抗率の差が2%超過であった場合は、電気抵抗率の測定において正確な測定値が得られにくいと判定し、表1においては「×」印で示した。
圧延板と、無酸素銅からなる導電材とを突き合わせ、その界面をファイバーレーザ溶接で溶接した。溶接後、溶接した短冊状の試験片に対して、JIS Z2241に規定された方法に準じる方法により、溶接方向に対して直交する方向に引っ張る引張試験を実施した。そして、試験片の破断強度が150MPa以上であった場合は、レーザ溶接性が良好であると判定し、表1においては「○」印で示した。一方、試験片の破断強度が150MPa未満であった場合は、レーザ溶接性が不良であると判定し、表1においては「×」印で示した。
比較例7、13の圧延板は、板厚が本発明の範囲を外れているため、レーザ溶接性が不良であった。また、パラメータAの値が上記の数値範囲から外れているため、電気抵抗率の測定において正確な測定値が得られにくかった。
T 基準点
Claims (4)
- マンガン2質量%以上14質量%以下を含有し、残部が銅及び不可避不純物からなる抵抗材用銅合金材料であって、
接触式膜厚計で測定した場合の板厚tが0.04mm以上の圧延板であり、
前記圧延板の板面について、圧延方向に対して直交する方向の粗さ曲線を接触式表面粗さ測定法により取得した場合に、最大高さRzが0.3μm以上1.5μm以下、粗さ曲線要素の平均長さRSmが0.03mm以上0.15mm以下であり、且つ、下記数式により算出されるパラメータAの値が0.002以上0.04以下である抵抗材用銅合金材料。
下記数式中のymaxは、前記粗さ曲線からその平均線が延びる方向に基準長さlだけを抜き取った抜き取り部分における最も高い山の高さである。下記数式中のyi、yi+1は、前記抜き取り部分に存在する前記粗さ曲線の測定点をそれぞれ基準点とした場合に、前記抜き取り部分の平均線が延びる方向の一端から数えて第i番目、第i+1番目に存在する基準点の高さである。下記数式中のxi、xi+1は、前記抜き取り部分の平均線が延びる方向の一端と第i番目、第i+1番目の基準点との間の平均線が延びる方向の長さである。下記数式中のnは、前記抜き取り部分の平均線が延びる方向の一端から最も離れた位置に存在する基準点が、前記抜き取り部分の平均線が延びる方向の一端から数えて第何番目の基準点かを表す数値である。下記数式中のtは、接触式膜厚計で測定した場合の前記圧延板の板厚である。
- ニッケル0質量%超過3質量%以下、錫0質量%超過4質量%以下、鉄0質量%超過0.5質量%以下、ケイ素0質量%超過0.1質量%以下、クロム0質量%超過0.5質量%以下、ジルコニウム0質量%超過0.2質量%以下、チタン0質量%超過0.2質量%以下、銀0質量%超過0.5質量%以下、マグネシウム0質量%超過0.5質量%以下、コバルト0質量%超過0.1質量%以下、リン0質量%超過0.1質量%以下、及び亜鉛0質量%超過0.5質量%以下からなる群より選ばれる1種又は2種以上の元素をさらに含有する請求項1に記載の抵抗材用銅合金材料。
- 請求項1又は請求項2に記載の抵抗材用銅合金材料を製造する方法であって、
銅合金の鋳塊に冷間圧延を施して板状に成形し圧延板とする冷間圧延工程と、
前記冷間圧延工程で得た圧延板に再結晶焼鈍しを施す再結晶焼鈍し工程と、
前記再結晶焼鈍し工程で再結晶焼鈍しを施した圧延板の板面に、粒度#800以上#2400以下の砥粒を用いるバフ研磨を施す表面研磨工程と、
前記表面研磨工程で板面を研磨した圧延板に加工率0%超過50%以下の冷間圧延を施す再冷間圧延工程と、
を備える抵抗材用銅合金材料の製造方法。 - 請求項1又は請求項2に記載の抵抗材用銅合金材料で少なくとも一部分が構成された抵抗器。
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