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CN-122012975-A - Nickel-chromium-based alloy foil with high stable temperature coefficient and preparation method thereof

CN122012975ACN 122012975 ACN122012975 ACN 122012975ACN-122012975-A

Abstract

The invention relates to the technical field of nichrome materials, in particular to a high-stability temperature coefficient nichrome-based alloy foil and a preparation method thereof, comprising the following steps of S1, preparing composite powder for standby, S2, weighing 60-70 parts of nickel powder, 20-25 parts of chromium powder, 3-6 parts of iron powder and 2-5 parts of molybdenum powder according to parts by weight, dry-mixing the composite powder with 2-8 parts of the composite powder to obtain mixed powder, S3, loading the mixed powder into a die, pressing a blank body, vacuum sintering, hot-rolling, multi-pass cold rolling and intermediate annealing, and finally annealing at a low temperature of 400-450 ℃ for 2-3 hours, and cooling along with a furnace to obtain the high-stability temperature coefficient nichrome-based alloy foil. In the invention, the base material is filled with the lattice gap to inhibit distortion and titanium carbide to prevent element diffusion, the auxiliary material forms a low-expansion rigid supporting point, and the influence of the lattice distortion and the element diffusion on the temperature coefficient is reduced by combining with the plasma activation and the coupling modification, so that the temperature coefficient stability of the alloy foil is effectively improved.

Inventors

  • ZHAO JUN
  • HAN YONG
  • WANG XIAOJIAN
  • DONG LI
  • GAO RAN
  • CHENG SHENGPENG
  • ZHAO JIANPING
  • ZHAO XIAOLAN
  • ZHANG CUIQIN
  • YUE XIANFANG
  • ZHANG YITONG
  • HAN DONGLIN
  • GAO DELU
  • LI MING
  • Sun Wanzi
  • ZHANG LIYUAN
  • HUANG RUI
  • ZHAO ZIYU
  • ZHAO XINYI
  • MA JINGJIE
  • ZHAO ZICHEN
  • WANG HAIQING
  • MA YANMEI
  • ZHANG HUAFENG

Assignees

  • 山东航天正和电子有限公司
  • 北京宇联阳明电子科技有限公司

Dates

Publication Date
20260512
Application Date
20260305

Claims (10)

  1. 1. The preparation method of the nickel-chromium-based alloy foil with high stable temperature coefficient is characterized by comprising the following steps of: S1, preparing composite powder for later use; S2, weighing 60-70 parts of nickel powder, 20-25 parts of chromium powder, 3-6 parts of iron powder and 2-5 parts of molybdenum powder according to parts by weight, and dry-mixing with 2-8 parts of composite powder to obtain mixed powder; S3, filling the mixed powder into a mould, pressing a blank, vacuum sintering, hot rolling, multi-pass cold rolling and intermediate annealing, and finally annealing at a low temperature of 400-450 ℃ for 2-3 hours, and cooling along with a furnace to obtain a nickel-chromium-based alloy foil with a high stable temperature coefficient; The composite powder is prepared by compounding a base material and auxiliary materials.
  2. 2. The preparation method of the high-stability temperature coefficient nickel-chromium-based alloy foil according to claim 1, wherein the preparation method of the composite powder is characterized in that 1 is prepared by mixing a base material and auxiliary materials according to the mass ratio (4-6), adding KH-560 ethanol solution, performing ultrasonic dispersion for 40-60min at 60kHz, then transferring into a planetary ball mill, taking absolute ethanol as a dispersion medium, performing ball milling for 2-3h at 300-400rpm, finally performing vacuum drying at 120-130 ℃ for 3-4h, grinding and sieving with a 400-mesh sieve to obtain the composite powder, wherein the mass of the KH-560 ethanol solution is 2-3% of the total mass of the base material and the auxiliary materials, and the mass fraction of the KH-560 ethanol solution is 5%.
  3. 3. The preparation method of the high-stability temperature coefficient nickel-chromium-based alloy foil according to claim 1, wherein the base material is prepared by ball milling and mixing yttrium powder, cerium powder, titanium carbide powder, vanadium boride powder, calcium powder and magnesium powder according to the mass ratio of (1-2) (1-1.5) (0.8-1.2) (0.5-1) (1:1).
  4. 4. The preparation method of the high-stability temperature coefficient nickel-chromium-based alloy foil material according to claim 1, wherein the preparation method of the auxiliary material comprises the steps of putting the mixture and the nano zirconia powder into a planetary ball mill according to the mass ratio (3-5) of 1, taking absolute ethyl alcohol as a dispersion medium, adding a fluxing agent accounting for 3-5% of the total mass of the mixture and the nano zirconia powder, ball milling for 6-8 hours at 400-450rpm, drying at 80-100 ℃, transferring into a corundum crucible, activating for 20-30 minutes by using microwave plasma with power of 800W under argon atmosphere, preserving heat for 5-6 hours at 1100-1200 ℃, cooling to room temperature along with a furnace, and crushing and sieving with a 500-mesh sieve to obtain the auxiliary material, wherein the fluxing agent is lithium fluoride.
  5. 5. The preparation method of the high-stability temperature coefficient nickel-chromium-based alloy foil according to claim 1, wherein the preparation method of the mixture is characterized in that nano titanium nitride powder is placed into plasma treatment equipment, mixed gas of argon and hydrogen is introduced, the power is 300-400W, the treatment is carried out for 10-20min, then the mixture is mixed with nano silicon nitride powder accounting for 5-8% of the mass of the nano titanium nitride powder, and the mixture is obtained by placing the mixture into a planetary ball mill for ball milling at 300-400rpm for 1-2h, wherein the volume ratio of the argon to the hydrogen is 4:1.
  6. 6. The method for preparing a high-stability temperature coefficient nickel-chromium-based alloy foil according to claim 1, wherein the parameters of vacuum sintering are that the temperature is raised to 800 ℃ at a temperature raising rate of 5 ℃ per minute, the temperature is kept for 2-3 hours, the temperature is raised to 1250-1350 ℃ at a temperature raising rate of 3 ℃ per minute, the temperature is kept for 4-6 hours, the temperature is lowered to 500 ℃ at 2 ℃ per minute, the temperature is cooled along with a furnace, and the vacuum degree is controlled to be 0.001-0.005Pa.
  7. 7. The preparation method of the high-stability temperature coefficient nickel-chromium-based alloy foil according to claim 1, wherein the hot rolling parameters are that a product obtained by sintering is heated to 900-1000 ℃, the heat preservation is carried out for 1-2 hours, multi-pass progressive rolling is adopted, 4 passes are adopted, the reduction rate of the first 2 passes is 15-18%, the reduction rate of the second 2 passes is 18-20%, the final rolling temperature is not lower than 750 ℃, and the alloy plate is obtained by rapidly cooling the product to below 300 ℃ after rolling.
  8. 8. The method for preparing the high-stability temperature coefficient nickel-chromium-based alloy foil according to claim 1, wherein the parameters of the intermediate annealing are that the vacuum degree is more than 0.01Pa, the temperature is firstly increased to 700-750 ℃ at the temperature increasing rate of 3 ℃ per minute, the heat is preserved for 1-1.5 hours, the temperature is further reduced to 500 ℃ at the temperature of 2 ℃ per minute, the heat is preserved for 30 minutes, and finally the intermediate annealing is carried out for 1-3 times, and the intermediate annealing is carried out between cold rolling procedures.
  9. 9. The method for preparing the high-stability temperature coefficient nickel-chromium-based alloy foil according to claim 1, wherein the parameters of cold rolling are that a plurality of passes are adopted for cold rolling, the reduction rate of the former 3 passes is 10-12%, the reduction rate of the latter passes is 8-10%, the rolling temperature is controlled to be less than 150 ℃ in the cold rolling process, the temperature is kept for 30min at 180-200 ℃ after every 3 passes of cold rolling, and the thickness is finally cold-rolled to 5-50 mu m.
  10. 10. The high stability temperature coefficient nickel-chromium-based alloy foil according to claim 1, wherein the high stability temperature coefficient nickel-chromium-based alloy foil is prepared by the method of any one of claims 1-9.

Description

Nickel-chromium-based alloy foil with high stable temperature coefficient and preparation method thereof Technical Field The invention relates to the technical field of nickel-chromium alloy materials, in particular to a nickel-chromium alloy foil with a high stable temperature coefficient and a preparation method thereof. Background The nickel-chromium alloy foil is a key material for manufacturing high-precision electronic components, aeroengine sealing foils and the like, is mainly composed of nickel, chromium and a small amount of other alloy elements, is manufactured through high-precision rolling and strict surface treatment, and has the characteristics of high resistivity, low resistance temperature coefficient, excellent mechanical strength, corrosion resistance and the like, and the precision and the stability of the electronic components are directly affected. In the prior art, the nickel-chromium-based alloy matrix is easy to cause grain growth and component segregation at high temperature, so that the internal components of the alloy are uneven, and the stability of the whole temperature coefficient is damaged due to the change of local resistivity. Based on the above, the invention provides a nickel-chromium alloy foil with high stable temperature coefficient and a preparation method thereof. Disclosure of Invention The invention aims to provide a nickel-chromium alloy foil with high stable temperature coefficient and a preparation method thereof, the nickel-chromium-based alloy foil with high stable temperature coefficient prepared by the method has high stable temperature coefficient, and the usability of the nickel-chromium-based alloy foil is effectively improved. In order to achieve the above purpose, the present invention provides the following technical solutions: In a first aspect, the invention provides a method for preparing a nickel-chromium-based alloy foil with high stable temperature coefficient, which comprises the following steps: S1, preparing composite powder for later use; S2, weighing 60-70 parts of nickel powder, 20-25 parts of chromium powder, 3-6 parts of iron powder and 2-5 parts of molybdenum powder according to parts by weight, and dry-mixing with 2-8 parts of composite powder to obtain mixed powder; and S3, filling the mixed powder into a mould, pressing a blank, vacuum sintering, hot rolling, multi-pass cold rolling and intermediate annealing, and finally annealing at a low temperature of 400-450 ℃ for 2-3 hours, and cooling along with a furnace to obtain the nickel-chromium-based alloy foil with high stable temperature coefficient. Further, the composite powder is prepared by compounding a base material and auxiliary materials. Further, the preparation method of the composite powder comprises the steps of (4-6) mixing a base material and auxiliary materials according to the mass ratio of (1), adding KH-560 ethanol solution, performing ultrasonic dispersion for 40-60min at 60kHz, then transferring into a planetary ball mill, performing ball milling for 2-3h at 300-400rpm by taking absolute ethanol as a dispersion medium, performing vacuum drying for 3-4h at 120-130 ℃, grinding and sieving with a 400-mesh sieve to obtain the composite powder, wherein the mass of the KH-560 ethanol solution is 2-3% of the total mass of the base material and the auxiliary materials, and the mass fraction of the KH-560 ethanol solution is 5%. Further, the base material is yttrium powder, cerium powder, titanium carbide powder, vanadium boride powder, calcium powder and magnesium powder, and the base material is prepared by ball milling and mixing according to the mass ratio of (1-2) (1-1.5) (0.8-1.2) (0.5-1) (1:1). The preparation method of the auxiliary material comprises the steps of (3-5) putting the mixture and the nano zirconia powder into a planetary ball mill according to the mass ratio of (3-5): 1, taking absolute ethyl alcohol as a dispersion medium, adding a fluxing agent accounting for 3-5% of the total mass of the mixture and the nano zirconia powder, ball milling for 6-8 hours at 400-450rpm, drying at 80-100 ℃, transferring into a corundum crucible, activating for 20-30 minutes by using microwave plasma with power of 800W under argon atmosphere, preserving heat for 5-6 hours at 1100-1200 ℃, cooling to room temperature along with a furnace, and then crushing and sieving with a 500-mesh sieve to obtain the auxiliary material, wherein the fluxing agent is lithium fluoride. The preparation method of the mixture comprises the steps of putting nano titanium nitride powder into plasma treatment equipment, introducing mixed gas of argon and hydrogen, treating for 10-20min at the power of 300-400W, then mixing with nano silicon nitride powder accounting for 5-8% of the mass of the nano titanium nitride powder, and putting into a planetary ball mill for ball milling for 1-2h at the speed of 300-400rpm to obtain the mixture, wherein the volume ratio of the argon to the hydrogen is 4:1.