A method for preparing ultra-thin nickel-chromium-aluminum-iron precision resistance alloy foil

Abstract

The invention provides a method for preparing a nickel-chromium-aluminum-iron precision resistance alloy ultra-thin foil. The specific steps are as follows: step 1, raw material selection: 1) selecting a nickel-chromium-aluminum-iron precision resistance alloy foil with a thickness of 0.15±0.015mm as an initial rolled foil; 2) controlling the main chemical composition of the initial rolled foil, according to mass percentage, Cr is 18.5-22.5%, Fe is 3.0-4.0%, Mn is 0.5-2.0%, Al is 1.5-2.3%, Si is less than or equal to 0.20%, and the balance is Ni; 3) controlling the electrical properties of the initial rolled foil: the resistivity at 20°C is 1.24±5% μΩ·m, and the resistance temperature coefficient at 20°C and 120°C is tested to be 0-+40ppm / °C; step 2, cold rolling treatment is performed by a precision cold rolling process; step 3, annealing treatment is performed by a vacuum annealing process; step 4, rolling into a nickel-chromium-aluminum-iron precision resistance alloy ultra-thin foil with a thickness of up to 5um. It can be stably and mass-produced, solving the problems existing in the prior art of this material.

Description

Technical Field

[0001] The invention relates to a method for preparing a foil material, in particular to a method for preparing an ultra-thin nickel-chromium-aluminum-iron precision resistance alloy foil material, and belongs to the manufacture and application of the ultra-thin nickel-chromium-aluminum-iron precision resistance alloy foil material. Background Art

[0002] Nickel-chromium-aluminum-iron precision resistance alloy is a new type of ultra-thin foil with high resistivity and low temperature coefficient. It has the characteristics of low thermal potential of copper, high tensile strength, oxidation resistance, corrosion resistance and non-magneticity. It is used to make precision resistance elements and strain gauges for various measuring instruments.

[0003] The thinnest foil produced in the prior art is more than 5.5um thick. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a method for preparing an ultra-thin foil of a nickel-chromium-aluminum-iron precision resistance alloy. Through unique raw material selection, precision cold rolling, vacuum annealing and other manufacturing process development, the thinnest foil that can be produced can reach 5um, and can be stably and mass-produced, thus solving the problems existing in the prior art of this material.

[0005] The technical solution of the present invention is: a method for preparing a nickel-chromium-aluminum-iron precision resistance alloy ultra-thin foil, the specific steps are as follows:

[0006] Step 1: Raw material selection:

[0007] 1) Selecting a nickel-chromium-aluminum-iron precision resistance alloy foil with a thickness of 0.15±0.015 mm as the initial rolled foil;

[0008] 2) Control the main chemical composition of the initial rolled foil, by mass percentage, Cr is 18.5-22.5%, Fe is 3.0-4.0%, Mn is 0.5-2.0%, Al is 1.5-2.3%, Si is ≤0.20%, and the balance is Ni;

[0009] 3) Control the electrical properties of the initial rolled foil: resistivity at 20°C 1.24±5%μΩ·m, resistance temperature coefficient at 20°C and 120°C 0~﹢40ppm / °C;

[0010] Step 2, cold rolling treatment using precision cold rolling process;

[0011] Step 3, annealing by vacuum annealing process;

[0012] Step 4: Roll the nickel-chromium-aluminum-iron precision resistor alloy into an ultra-thin foil with a thickness of up to 5um.

[0013] Furthermore, the cold rolling process described in step 2 is carried out by using a precision cold rolling process, and the specific steps are as follows:

[0014] Step 21, cutting;

[0015] Step 22, first rolling: control the pressure to 8000±50kg, the front tension to 450±5kg, and the rear tension to 270±5kg;

[0016] Step 23: Ultra-thin trimming;

[0017] Step 24, finishing rolling: control the pressure to 3000±50kg, the front tension to 230±5kg, and the rear tension to 140±5kg;

[0018] Step 25, multiple cleaning: control speed 15mpm, current 70A;

[0019] Step 26: vacuum heat treatment;

[0020] Step 27, pouring;

[0021] Step 28, inspection;

[0022] Step 29: Packing and shipment.

[0023] Furthermore, the ultra-thin trimming in step 23 uses a blade with a chamfer angle of 10°.

[0024] Furthermore, the vacuum annealing process is used for annealing in step 3, and the specific steps are as follows:

[0025] Step 31, heating from room temperature to 460°C, heating time 0.5h;

[0026] Step 32, 460° C. insulation for 4 hours;

[0027] Step 33: Naturally cool from 460°C to room temperature for 6 hours.

[0028] Furthermore, the nickel-chromium-aluminum-iron precision resistance alloy ultra-thin foil rolled in step 4 has a resistivity of 1.27±5% μΩ·m at 20°C, and a resistance temperature coefficient of 0~±30ppm / °C at 20°C and 120°C.

[0029] The beneficial effects of the present invention are: providing a method for preparing ultra-thin foil of nickel-chromium-aluminum-iron precision resistance alloy, controlling the main chemical components such as Ni, Cr, Fe, electrical properties, external dimensions and tolerances when selecting raw materials. Through precision cold rolling, vacuum annealing and other manufacturing processes, an ultra-thin foil with a minimum thickness of 5um is produced, and stable mass production is achieved. DETAILED DESCRIPTION

[0030] The present invention provides a method for preparing an ultra-thin nickel-chromium-aluminum-iron precision resistance alloy foil. Through unique raw material selection, precision cold rolling, and vacuum annealing manufacturing process development, the foil can be stably and mass-produced, and the thinnest thickness can reach 5um. The following is the process development of the present invention:

[0031] 1. Raw material selection

[0032] 1) Select nickel-chromium-aluminum-iron precision resistance alloy foil with a thickness of 0.15mm as the initial rolled foil, and the dimensions and tolerance requirements are as follows:

[0033]

[0034]

[0035] 2) Control the main chemical composition of the initial rolled foil:

[0036]

[0037] 3) Control the electrical properties of the initial rolled foil

[0038]

[0039] 2. Precision cold rolling process

[0040] 1) Process flow:

[0041] Cutting - first rolling - ultra-thin trimming - finish rolling - multiple cleanings - vacuum heat treatment - unloading - inspection - packaging and shipment.

[0042] 2) Process and parameters

[0043]

[0044] 3. Vacuum annealing process

[0045] 1) From room temperature to 460℃, heating time: 0.5h.

[0046] 2) Keep at 460℃ for 4h.

[0047] 3) Naturally cool from 460℃ to room temperature for 6h.

[0048] Through the above-mentioned process, it can be rolled into an extremely thin foil of nickel-chromium-aluminum-iron precision resistance alloy with a thickness of up to 5um.

[0049] 4. Performance index test and comparison

[0050]

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a nickel-chromium-aluminum-iron precision resistance alloy ultra-thin foil, characterized in that: The specific steps are as follows: Step 1: Raw material selection: 1) Selecting a nickel-chromium-aluminum-iron precision resistance alloy foil with a thickness of 0.15±0.015 mm as the initial rolled foil; 2) Control the main chemical composition of the initial rolled foil, by mass percentage, Cr is 18.5-22.5%, Fe is 3.0-4.0%, Mn is 0.5-2.0%, Al is 1.5-2.3%, Si is ≤0.20%, and the balance is Ni; 3) Control the electrical properties of the initial rolled foil: resistivity at 20°C 1.24±5%μΩ·m, resistance temperature coefficient at 20°C and 120°C 0~﹢40ppm / °C; Step 2, cold rolling treatment using precision cold rolling process; Step 3, annealing by vacuum annealing process; Step 4: Roll the nickel-chromium-aluminum-iron precision resistor alloy into an ultra-thin foil with a thickness of up to 5um.

2. The method for preparing a nickel-chromium-aluminum-iron precision resistance alloy ultra-thin foil according to claim 1, characterized in that: Step 2 is cold-rolled by a precision cold-rolling process, and the specific steps are as follows: Step 21, cutting; Step 22, first rolling: control the pressure to 8000±50kg, the front tension to 450±5kg, and the rear tension to 270±5kg; Step 23: Ultra-thin trimming; Step 24, finishing rolling: control the pressure to 3000±50kg, the front tension to 230±5kg, and the rear tension to 140±5kg; Step 25, multiple cleaning: control speed 15mpm, current 70A; Step 26: vacuum heat treatment; Step 27, pouring; Step 28, inspection; Step 29: Packing and shipment.

3. The method for preparing a nickel-chromium-aluminum-iron precision resistance alloy ultra-thin foil according to claim 2, characterized in that: The ultra-thin trimming in step 23 uses a blade with a chamfer angle of 10°.

4. The method for preparing a nickel-chromium-aluminum-iron precision resistance alloy ultra-thin foil according to claim 1, characterized in that: The vacuum annealing process is used in step 3, and the specific steps are as follows: Step 31, heating from room temperature to 460°C, heating time 0.5h; Step 32, 460° C. insulation for 4 hours; Step 33: Naturally cool from 460°C to room temperature for 6 hours.

5. The method for preparing a nickel-chromium-aluminum-iron precision resistance alloy ultra-thin foil according to claim 1, characterized in that: The nickel-chromium-aluminum-iron precision resistance alloy ultra-thin foil rolled in step 4 has a resistivity of 1.27±5% μΩ·m at 20°C, and a resistance temperature coefficient of 0~±30ppm / °C at 20°C and 120°C.

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