CN117954164B - Method for preparing superconducting cable for quantum computer by powder metallurgy method - Google Patents
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- CN117954164B CN117954164B CN202410348091.1A CN202410348091A CN117954164B CN 117954164 B CN117954164 B CN 117954164B CN 202410348091 A CN202410348091 A CN 202410348091A CN 117954164 B CN117954164 B CN 117954164B
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 110
- 238000005245 sintering Methods 0.000 claims abstract description 95
- 239000004020 conductor Substances 0.000 claims abstract description 40
- 238000003825 pressing Methods 0.000 claims abstract description 28
- 238000005520 cutting process Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 4
- 239000007924 injection Substances 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 20
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 16
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000002490 spark plasma sintering Methods 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 239000002096 quantum dot Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000002070 nanowire Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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Abstract
The application discloses a method for preparing a superconducting cable for a quantum computer by a powder metallurgy method, which comprises the following steps: injecting NbTi powder or Nb powder into a sintering mold by adopting a micron powder injection technology, and pressing; performing SPS discharge plasma sintering on NbTi powder or Nb powder in a sintering die, and demolding and taking out to obtain an outer conductor blank and an inner conductor blank; injecting nanoscale insulating powder into a cavity between the outer conductor blank and the inner conductor blank, and pressing to obtain a superconducting coaxial blank; sintering the superconducting coaxial material blank to obtain a superconducting coaxial cable; and cutting off and straightening the head and the tail of the superconducting coaxial cable to obtain the superconducting coaxial cable for the quantum computer. The superconducting coaxial cable suitable for the quantum computer is prepared by combining a powder metallurgy method, a spark plasma sintering technology and a nanoscale insulating powder sintering method.
Description
Technical Field
The invention relates to the technical field of superconducting composite cable processing, in particular to a method for preparing a superconducting cable for a quantum computer by a powder metallurgy method.
Background
The superconducting coaxial cable is a bridge for connecting the quantum chip at low temperature and the room temperature measurement and control system because of extremely low heat leakage and signal attenuation, and is mainly used for transmitting, modulating and measuring and outputting the quantum bit signals. The superconducting coaxial cable is generally made of Nb or NbTi, and the preparation technology of the superconducting coaxial cable is monopoly abroad due to extremely poor cold processing capability, so that the preparation technology of the superconducting coaxial cable for a quantum computer needs to be broken through as soon as possible.
In the prior art, the patent publication No. CN103738964A, namely a preparation method of a SiC/SiO2 coaxial nanowire, takes one of artificial graphite powder, activated carbon powder and crystalline flake graphite powder as a carbon source, takes one or more of silicon powder, amorphous silicon oxide powder and nano silicon oxide powder as a silicon source, fully mixes the carbon source and the silicon source, then places the mixture into a microwave resonant cavity, vacuumizes the microwave resonant cavity, heats the mixture formed by the carbon source and the silicon source by utilizing microwave irradiation, and carries out heat preservation reaction to obtain the SiC/SiO2 coaxial nanowire.
The prior art uses a carbon source and a silicon source as materials for preparing the coaxial nanowire, does not relate to the processing of Nb or NbTi and the preparation of a superconducting coaxial cable, and lacks a preparation method capable of preparing the Nb or NbTi superconducting coaxial cable.
Disclosure of Invention
The invention provides a method for preparing a superconducting cable for a quantum computer by a powder metallurgy method, which is used for solving the problem that the prior art does not have a reliable preparation method for preparing an Nb or NbTi superconducting coaxial cable.
In one aspect, the invention provides a method for preparing a superconducting cable for a quantum computer by a powder metallurgy method, which comprises the following steps:
Step one, adopting a micron powder injection technology, gradually injecting NbTi powder or Nb powder into a sintering die from the bottom end, and pressing.
And step two, performing SPS discharge plasma sintering on the NbTi powder or the Nb powder in the sintering die, and demolding and taking out to obtain an NbTi or Nb outer conductor blank and an NbTi or Nb inner conductor blank, wherein a cavity exists between the outer conductor blank and the inner conductor blank.
Step three, gradually injecting the nanoscale insulating powder into a cavity between the outer conductor blank and the inner conductor blank from the bottom end, and pressing to obtain the superconducting coaxial blank.
And step four, sintering the superconducting coaxial material blank to obtain the superconducting coaxial cable.
And fifthly, cutting and straightening the head and the tail of the superconducting coaxial cable to obtain the superconducting coaxial cable for the quantum computer.
In one possible implementation manner, in the first step, the component of the NbTi powder is 53% Nb by mass and 47% Ti by mass, the purity of the Nb powder is 99.99%, and the particle diameter of the NbTi powder or the Nb powder is 50nm.
In one possible implementation manner, in the first step, the sintering mold includes a first concentric circular tube and a second circular tube, the first circular tube is outside the second circular tube, and one end of the sintering mold is closed, and the other end of the sintering mold is open.
The second circular tube is internally provided with a cylindrical cavity, and a circular tube-shaped cavity is arranged between the first circular tube and the second circular tube.
In one possible implementation manner, in the first step, the pressing pressure is 20-50MPa, and the pressure is maintained for 20-40s.
In one possible implementation, in the second step, the sintering temperature of the NbTi powder is 800-1400 ℃, and the sintering temperature of the Nb powder is 1500-2000 ℃.
The sintering vacuum degree of the NbTi powder or the Nb powder is not lower than 10 -3 Pa, and the sintering time is 5-20min.
In one possible implementation, in the third step, the insulating powder is a PTFE powder, and the particle diameter of the PTFE powder is 50nm.
In one possible implementation manner, in the third step, the pressing pressure is 10-30MPa, and the pressure is maintained for 10-20s.
In a possible implementation manner, in the fourth step, the superconducting coaxial preform is sintered by adopting a vacuum furnace, wherein the sintering vacuum degree is not lower than 10 -3 Pa, the sintering time is 5-20min, and the sintering temperature is 300-400 ℃.
In a possible implementation manner, in the fifth step, a metallographic section is further performed in the process of cutting the superconducting coaxial cable head and tail, and the uniformity and concentricity of the superconducting coaxial cable are analyzed according to the metallographic section.
The method for preparing the superconducting cable for the quantum computer by the powder metallurgy method has the following advantages:
the superconducting coaxial cable suitable for the quantum computer is prepared by combining a powder metallurgy method, a spark plasma sintering technology and a nanoscale insulating powder sintering method.
By setting the composition of the NbTi powder, the purity of the Nb powder, the particle diameter of the NbTi powder or Nb powder, and performing pressing, the density of the conductive portion is improved.
The sintering die comprises the first circular tube and the second circular tube which are concentric, the first circular tube is arranged on the outer side of the second circular tube, one end of the sintering die is closed, the other end of the sintering die is open, concentricity of the outer conductor blank and the inner conductor blank is improved, the outer conductor blank and the inner conductor blank are obtained at one time, and the preparation process is simplified.
By performing SPS discharge plasma sintering on NbTi powder or Nb powder in the sintering die, the sintering density is improved.
The nano-scale insulating powder is gradually injected into the cavity between the outer conductor blank and the inner conductor blank from the bottom end, and is pressed, so that the superconducting coaxial blank is obtained, and the density of the insulating part is improved.
The provided metallographic section is also carried out in the process of cutting the superconducting coaxial cable head and tail, and the metallographic section is analyzed, so that the uniformity and concentricity of the final superconducting coaxial cable are ensured.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a method for preparing a superconducting cable for a quantum computer by a powder metallurgy method according to an embodiment of the present invention;
FIG. 2 is a schematic front view in cross section of a sintering mold according to an embodiment of the present invention;
FIG. 3 is a schematic left-hand view of a sintering mold according to an embodiment of the present invention;
FIG. 4 is a right side view schematically illustrating a sintering mold according to an embodiment of the present invention;
Fig. 5 is a metallographic cross-sectional view provided by an embodiment of the present invention.
Reference numerals illustrate:
1-sintering mould, 11-first pipe, 12-second pipe.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the embodiment of the invention provides a method for preparing a superconducting cable for a quantum computer by a powder metallurgy method, which comprises the following steps:
Step one, adopting a micron powder injection technology, gradually injecting NbTi powder or Nb powder into a sintering die 1 from the bottom end, and pressing.
And secondly, performing SPS discharge plasma sintering on the NbTi powder or the Nb powder in the sintering die 1, and demolding and taking out to obtain an NbTi or Nb outer conductor blank and an NbTi or Nb inner conductor blank, wherein a cavity exists between the outer conductor blank and the inner conductor blank.
Step three, gradually injecting the nanoscale insulating powder into a cavity between the outer conductor blank and the inner conductor blank from the bottom end, and pressing to obtain the superconducting coaxial blank.
And step four, sintering the superconducting coaxial material blank to obtain the superconducting coaxial cable.
And fifthly, cutting and straightening the head and the tail of the superconducting coaxial cable to obtain the superconducting coaxial cable for the quantum computer.
Illustratively, in the first step, the NbTi powder has a composition of 53% by mass of Nb and 47% by mass of Ti, the Nb powder has a purity of 99.99%, and the NbTi powder or Nb powder has a particle diameter of 50nm.
Illustratively, in the first step, the sintering mold 1 includes a first circular tube 11 and a second circular tube 12 that are concentric, the first circular tube 11 is outside the second circular tube 12, and one end of the sintering mold 1 is closed and the other end is open.
A cylindrical cavity is formed in the second circular tube 12, and a circular tube-shaped cavity is formed between the first circular tube 11 and the second circular tube 12.
Illustratively, in the first step, the pressing pressure is 20-50MPa, and the pressure is maintained for 20-40s.
Illustratively, in the second step, the sintering temperature of the NbTi powder is 800-1400 ℃ and the sintering temperature of the Nb powder is 1500-2000 ℃.
The sintering vacuum degree of the NbTi powder or the Nb powder is not lower than 10 -3 Pa, and the sintering time is 5-20min.
Illustratively, in the third step, the insulating powder is a PTFE powder having a particle diameter of 50nm.
Illustratively, in the third step, the pressing pressure is 10-30MPa, and the pressure is maintained for 10-20s.
In the fourth step, the superconducting coaxial preform is sintered by a vacuum furnace, wherein the sintering vacuum degree is not lower than 10 -3 Pa, the sintering time is 5-20min, and the sintering temperature is 300-400 ℃.
In the fifth step, a metallographic section is further performed in the process of cutting the superconducting coaxial cable end to end, and the uniformity and concentricity of the superconducting coaxial cable are analyzed according to the metallographic section.
Example 1:
Specifically, in the present embodiment, in the first step, nbTi spherical powder of 53% nb by mass and 47% ti by mass was used as the conductor material, the particle diameter of NbTi powder was 50nm, the outer diameter of the first round tube 11 was 5mm, the inner diameter was 2.2mm, the outer diameter of the second round tube 12 was 1.6mm, the inner diameter was 0.5mm, the pressing pressure was 50MPa, and the pressure was maintained for 40s; in the second step, the sintering temperature of NbTi powder is 1400 ℃, the vacuum degree is not lower than 10 -3 Pa, and the sintering time is 20min; in the third step, the insulating powder adopts PTFE powder, the particle diameter of the PTFE powder is 50nm, the pressing pressure is 30MPa, and the pressure is maintained for 20s; in the fourth step, the sintering vacuum degree is not lower than 10 -3 Pa, the sintering time is 20min, and the sintering temperature is 400 ℃; and step five, cutting off the head and the tail, straightening, and carrying out metallographic section in the process of cutting off the head and the tail of the superconducting coaxial cable, and analyzing the uniformity and the concentricity of the superconducting coaxial cable according to the metallographic section. The final characteristic impedance of the superconducting cable for the quantum computer is 50Ω, the heat leakage is less than 0.2 mu W/(m.K), the signal attenuation is less than 0.1dB/m, and the superconducting cable can be used for measuring the quantum bit through the installation test.
As shown in fig. 2 to 4, which are respectively a schematic front view, a schematic left view and a schematic right view of the sintering mold 1 of example 1, the outer diameter of the first round tube 11 is 5mm, the inner diameter is 2.2mm, the outer diameter of the second round tube 12 is 1.6mm, and the inner diameter is 0.5mm.
As shown in FIG. 5, which is a metallographic cross-sectional view of the superconducting cable for the quantum computer prepared in example 1, the unit length is 200. Mu.m, and it can be seen that the superconducting cable for the quantum computer prepared in example 1 has high concentricity.
Example 2:
specifically, in the present embodiment, in the first step, nbTi spherical powder of 53% nb by mass and 47% ti by mass was used as the conductor material, the particle diameter of NbTi powder was 50nm, the outer diameter of the first round tube 11 was 5mm, the inner diameter was 2.2mm, the outer diameter of the second round tube 12 was 1.6mm, the inner diameter was 0.5mm, the pressing pressure was 40MPa, and the pressure was maintained for 30s; in the second step, the sintering temperature of NbTi powder is 1200 ℃, the vacuum degree is not lower than 10 -3 Pa, and the sintering time is 15min; in the third step, the insulating powder adopts PTFE powder, the particle diameter of the PTFE powder is 50nm, the pressing pressure is 20MPa, and the pressure is maintained for 15s; in the fourth step, the sintering vacuum degree is not lower than 10 -3 Pa, the sintering time is 15min, and the sintering temperature is 350 ℃; and step five, cutting off the head and the tail, straightening, and carrying out metallographic section in the process of cutting off the head and the tail of the superconducting coaxial cable, and analyzing the uniformity and the concentricity of the superconducting coaxial cable according to the metallographic section. The final characteristic impedance of the superconducting cable for the quantum computer is 50Ω, the heat leakage is less than 0.2 mu W/(m.K), the signal attenuation is less than 0.1dB/m, and the superconducting cable can be used for measuring the quantum bit through the installation test.
Example 3:
Specifically, in the present embodiment, in the first step, nbTi spherical powder of 53% nb by mass and 47% ti by mass was used as the conductor material, the particle diameter of the NbTi powder was 50nm, the outer diameter of the first round tube 11 was 3mm, the inner diameter was 0.86mm, the outer diameter of the second round tube 12 was 0.66mm, the inner diameter was 0.21mm, the pressing pressure was 20MPa, and the pressure was maintained for 20s; in the second step, the sintering temperature of NbTi powder is 800 ℃, the vacuum degree is not lower than 10 -3 Pa, and the sintering time is 5min; in the third step, the insulating powder adopts PTFE powder, the particle diameter of the PTFE powder is 50nm, the pressing pressure is 10MPa, and the pressure is maintained for 10s; in the fourth step, the sintering vacuum degree is not lower than 10 -3 Pa, the sintering time is 5min, and the sintering temperature is 300 ℃; and step five, cutting off the head and the tail, straightening, and carrying out metallographic section in the process of cutting off the head and the tail of the superconducting coaxial cable, and analyzing the uniformity and the concentricity of the superconducting coaxial cable according to the metallographic section. The final characteristic impedance of the superconducting cable for the quantum computer is 50Ω, the heat leakage is less than 0.2 mu W/(m.K), the signal attenuation is less than 0.1dB/m, and the superconducting cable can be used for measuring the quantum bit through the installation test.
Example 4:
Specifically, in the present embodiment, in the first step, nb spherical powder having a purity of 99.99% is used as the conductor material, the particle diameter of the Nb powder is 50nm, the outer diameter of the first round tube 11 is 5mm, the inner diameter is 2.2mm, the outer diameter of the second round tube 12 is 1.6mm, the inner diameter is 0.5mm, the pressing pressure is 30MPa, and the pressure is maintained for 30s; in the second step, the sintering temperature of Nb powder is 1500 ℃, the vacuum degree is not lower than 10 -3 Pa, and the sintering time is 20min; in the third step, the insulating powder adopts PTFE powder, the particle diameter of the PTFE powder is 50nm, the pressing pressure is 25MPa, and the pressure is maintained for 20s; in the fourth step, the sintering vacuum degree is not lower than 10 -3 Pa, the sintering time is 15min, and the sintering temperature is 380 ℃; and step five, cutting off the head and the tail, straightening, and carrying out metallographic section in the process of cutting off the head and the tail of the superconducting coaxial cable, and analyzing the uniformity and the concentricity of the superconducting coaxial cable according to the metallographic section. The final characteristic impedance of the superconducting cable for the quantum computer is 50Ω, the heat leakage is less than 0.2 mu W/(m.K), the signal attenuation is less than 0.1dB/m, and the superconducting cable can be used for measuring the quantum bit through the installation test.
Example 5:
Specifically, in the present embodiment, in the first step, nb spherical powder having a purity of 99.99% is used as the conductor material, the particle diameter of the Nb powder is 50nm, the outer diameter of the first round tube 11 is 5mm, the inner diameter is 2.2mm, the outer diameter of the second round tube 12 is 1.6mm, the inner diameter is 0.5mm, the pressing pressure is 25MPa, and the pressure is maintained for 25s; in the second step, the sintering temperature of Nb powder is 1800 ℃, the vacuum degree is not lower than 10 -3 Pa, and the sintering time is 15min; in the third step, the insulating powder adopts PTFE powder, the particle diameter of the PTFE powder is 50nm, the pressing pressure is 20MPa, and the pressure is maintained for 15s; in the fourth step, the sintering vacuum degree is not lower than 10 -3 Pa, the sintering time is 10min, and the sintering temperature is 360 ℃; and step five, cutting off the head and the tail, straightening, and carrying out metallographic section in the process of cutting off the head and the tail of the superconducting coaxial cable, and analyzing the uniformity and the concentricity of the superconducting coaxial cable according to the metallographic section. The final characteristic impedance of the superconducting cable for the quantum computer is 50Ω, the heat leakage is less than 0.2 mu W/(m.K), the signal attenuation is less than 0.1dB/m, and the superconducting cable can be used for measuring the quantum bit through the installation test.
Example 6:
Specifically, in the present embodiment, in the first step, nb spherical powder having a purity of 99.99% is used as the conductor material, the particle diameter of the Nb powder is 50nm, the outer diameter of the first round tube 11 is 3mm, the inner diameter is 0.86mm, the outer diameter of the second round tube 12 is 0.66mm, the inner diameter is 0.21mm, the pressing pressure is 20MPa, and the pressure is maintained for 20s; in the second step, the sintering temperature of Nb powder is 2000 ℃, the vacuum degree is not lower than 10 -3 Pa, and the sintering time is 5min; in the third step, the insulating powder adopts PTFE powder, the particle diameter of the PTFE powder is 50nm, the pressing pressure is 10MPa, and the pressure is maintained for 10s; in the fourth step, the sintering vacuum degree is not lower than 10 -3 Pa, the sintering time is 5min, and the sintering temperature is 320 ℃; and step five, cutting off the head and the tail, straightening, and carrying out metallographic section in the process of cutting off the head and the tail of the superconducting coaxial cable, and analyzing the uniformity and the concentricity of the superconducting coaxial cable according to the metallographic section. The final characteristic impedance of the superconducting cable for the quantum computer is 50Ω, the heat leakage is less than 0.2 mu W/(m.K), the signal attenuation is less than 0.1dB/m, and the superconducting cable can be used for measuring the quantum bit through the installation test.
The superconducting coaxial cable suitable for the quantum computer is prepared by combining a powder metallurgy method, a spark plasma sintering technology and a nanoscale insulating powder sintering method.
By setting the composition of the NbTi powder, the purity of the Nb powder, the particle diameter of the NbTi powder or Nb powder, and performing pressing, the density of the conductive portion is improved.
The sintering die comprises the first circular tube and the second circular tube which are concentric, the first circular tube is arranged on the outer side of the second circular tube, one end of the sintering die is closed, the other end of the sintering die is open, concentricity of the outer conductor blank and the inner conductor blank is improved, the outer conductor blank and the inner conductor blank are obtained at one time, and the preparation process is simplified.
By performing SPS discharge plasma sintering on NbTi powder or Nb powder in the sintering die, the sintering density is improved.
The nano-scale insulating powder is gradually injected into the cavity between the outer conductor blank and the inner conductor blank from the bottom end, and is pressed, so that the superconducting coaxial blank is obtained, and the density of the insulating part is improved.
The provided metallographic section is also carried out in the process of cutting the superconducting coaxial cable head and tail, and the metallographic section is analyzed, so that the uniformity and concentricity of the final superconducting coaxial cable are ensured.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A method for preparing a superconducting cable for a quantum computer by a powder metallurgy method, which is characterized by comprising the following steps:
Step one, adopting a micron powder injection technology, gradually injecting NbTi powder or Nb powder into a sintering mould from the bottom end, and pressing;
Performing SPS discharge plasma sintering on NbTi powder or Nb powder in a sintering die, and demolding and taking out to obtain an NbTi or Nb outer conductor blank and an NbTi or Nb inner conductor blank, wherein a cavity exists between the outer conductor blank and the inner conductor blank;
Step three, gradually injecting nanoscale insulating powder into a cavity between the outer conductor blank and the inner conductor blank from the bottom end, and pressing to obtain a superconducting coaxial blank;
Sintering the superconducting coaxial material blank to obtain a superconducting coaxial cable;
step five, cutting off and straightening the head and the tail of the superconducting coaxial cable to obtain the superconducting coaxial cable for the quantum computer;
In the first step, the sintering mold comprises a first concentric circular pipe and a second concentric circular pipe, wherein the first circular pipe is arranged outside the second circular pipe, one end of the sintering mold is closed, and the other end of the sintering mold is open;
The second circular tube is internally provided with a cylindrical cavity, and a circular tube-shaped cavity is arranged between the first circular tube and the second circular tube.
2. The method for producing a superconducting cable for a quantum computer according to claim 1, wherein in the first step, the component of the NbTi powder is 53% by mass of Nb and 47% by mass of Ti, the purity of the Nb powder is 99.99%, and the particle diameter of the NbTi powder or the Nb powder is 50nm.
3. The method for preparing a superconducting cable for a quantum computer by a powder metallurgy method according to claim 1, wherein in the first step, the pressing pressure is 20-50MPa, and the pressure is maintained for 20-40s.
4. The method for preparing a superconducting cable for a quantum computer by a powder metallurgy method according to claim 1, wherein in the second step, the sintering temperature of the NbTi powder is 800-1400 ℃, and the sintering temperature of the Nb powder is 1500-2000 ℃;
The sintering vacuum degree of the NbTi powder or the Nb powder is not lower than 10 -3 Pa, and the sintering time is 5-20min.
5. The method for producing a superconducting cable for a quantum computer according to claim 1, wherein in the third step, the insulating powder is a PTFE powder having a particle diameter of 50nm.
6. The method for preparing a superconducting cable for a quantum computer by a powder metallurgy method according to claim 1, wherein in the third step, the pressing pressure is 10-30MPa, and the pressure is maintained for 10-20s.
7. The method for preparing a superconducting cable for a quantum computer by a powder metallurgy method according to claim 1, wherein in the fourth step, a vacuum furnace is adopted to sinter the superconducting coaxial preform, the sintering vacuum degree is not lower than 10 -3 Pa, the sintering time is 5-20min, and the sintering temperature is 300-400 ℃.
8. The method for preparing a superconducting cable for a quantum computer according to claim 1, wherein in the fifth step, a metallographic section is further performed in the process of cutting the superconducting coaxial cable head and tail, and the uniformity and concentricity of the superconducting coaxial cable are analyzed according to the metallographic section.
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Citations (15)
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| CN117954164A (en) | 2024-04-30 |
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