CN115831516B - Magnetic conduction sleeve, preparation method and application thereof - Google Patents
Magnetic conduction sleeve, preparation method and application thereof Download PDFInfo
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- CN115831516B CN115831516B CN202211583059.9A CN202211583059A CN115831516B CN 115831516 B CN115831516 B CN 115831516B CN 202211583059 A CN202211583059 A CN 202211583059A CN 115831516 B CN115831516 B CN 115831516B
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 10
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- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000010703 silicon Substances 0.000 claims abstract description 10
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- 239000012535 impurity Substances 0.000 claims abstract description 8
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 7
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- 229910045601 alloy Inorganic materials 0.000 claims description 31
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
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- 230000017531 blood circulation Effects 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 229910001004 magnetic alloy Inorganic materials 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
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- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 206010019280 Heart failures Diseases 0.000 description 1
- 208000007536 Thrombosis Diseases 0.000 description 1
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Abstract
The invention aims to provide a magnetic conduction sleeve with high magnetic conductivity, a preparation method and application thereof. The composition comprises the following components: 15% -18% of chromium, 0.5% -4% of silicon, 0.2% -0.5% of nickel, 3.5% -5.75% of aluminum, 0.2% -0.6% of titanium, 0.3% -0.7% of yttrium oxide, 0.2% -0.3% of molybdenum, 0.1% -0.3% of manganese, 0.01% -0.3% of cobalt, 0.001% -0.1% of carbon content, and the balance of iron and other unavoidable impurities, wherein the content of the other unavoidable impurities is less than 0.9%. The magnetic conductive sleeve manufactured by the components and the special manufacturing method has high density and high magnetic flux density, can meet the characteristic of high magnetic conductivity while meeting the requirement of small overall thickness, and tests show that when the magnetic conductive sleeve is applied to a catheter pump motor, 100% magnetic reflux can be met, meanwhile, hysteresis phenomenon is avoided, the motor is started smoothly, and the eddy current loss is extremely low.
Description
Technical Field
The invention relates to the technical field of magnetic functional materials, in particular to a magnetic conduction sleeve and a preparation method thereof, and application of the magnetic conduction sleeve in a miniature motor, and particularly relates to application of the magnetic conduction sleeve in a hollow cup motor and a catheter pump.
Background
Catheter pumps may (partially) replace the heart function of the patient and provide hemodynamic support for patients suffering from cardiogenic shock or heart failure. After percutaneous implantation into the heart, the in vivo motor drives the impeller to rotate, so that the catheter pump can realize the pumping flow of 2.5-5.0L/min at the rotating speed of 3-6 ten thousand revolutions per minute, and the catheter pump supports the short-term (days or weeks) or long-term (weeks or months) application of life. The catheter pump is generally not larger than 5mm in outer diameter due to the limitation of the inner diameter of the blood vessel, and the motor performance is restricted by the structural size.
The hollow cup motor has miniaturized and high-power performance and can be applied to a catheter pump. At present, a hollow cup motor is manufactured into a tubular stator by superposing silicon steel sheets, the magnetic leakage phenomenon is easy to occur at the joint, the magnetic reflux cannot be met by 100%, the magnetic loss is large, and the torque output of the motor is influenced. In addition, the applicant also found that when the magnetic poles formed after the stator is magnetically conducted cannot be released in a short time, hysteresis occurs, which results in unsmooth motor start and affects the working stability of the motor.
Disclosure of Invention
Unless otherwise indicated, when the invention relates to a percentage between liquids, the percentages are volume/volume percentages; the invention relates to the percentage between liquid and solid, said percentage being volume/weight percentage; the invention relates to the percentage between solids and liquids, the percentage being weight/volume percentage; the balance being weight/weight percent.
The invention aims at providing a magnetic conduction sleeve with high relative magnetic conductivity and good corrosion resistance.
As a preferable technical scheme, the magnetic conduction sleeve comprises the following components in percentage by mass: 15% -18% of chromium, 0.5% -4% of silicon, 0.2% -0.5% of nickel, 3.5% -5.75% of aluminum, 0.2% -0.6% of titanium, 0.3% -0.7% of yttrium oxide, 0.2% -0.3% of molybdenum, 0.1% -0.3% of manganese, 0.01% -0.3% of cobalt, 0.001% -0.1% of carbon, the balance of iron and other unavoidable impurities, and the content of the other unavoidable impurities is less than 0.9%.
Among the components, the alloy steel is made of iron and a small amount of carbon, is not easy to demagnetize after magnetization, is a hard magnetic material with excellent performance, and has the characteristics of good ductility and good electric and heat conductivity; wherein chromium has good corrosion resistance and can reduce the strength of vortex; cobalt is an important raw material for producing heat-resistant alloy, hard alloy, anti-corrosion alloy, magnetic alloy and various cobalt salts, and the addition of cobalt is beneficial to improving the hardness, anti-corrosion performance and magnetic conductivity of the soft magnetic material; the addition of titanium and molybdenum enhances the strength, corrosion resistance and wear resistance of the soft magnetic material; nickel is a hard, ductile and ferromagnetic metal that is capable of highly soft magnetic material polishing and corrosion resistance; the addition of silicon helps to increase the resistivity and maximum relative permeability of iron, and reduces coercivity, sleeve loss (iron loss) and magnetic aging; the same yttrium oxide contributes to the increase of the resistivity of the soft magnetic material; in order to form an insulating layer on the outer surface of the soft magnetic material, aluminum is added into the alloy, aluminum oxide is obtained after chemical reaction, and the insulating layer is formed on the outer surface of the soft magnetic material, so that the insulating layer has an isolation function and can increase the corrosion resistance of the stator; manganese has deoxidizing, desulfurizing and regulating functions, such as preventing the formation of carbide at the grain edge of steel, and can increase the strength, toughness and quenching property of steel.
The magnetic conduction sleeve manufactured by the components has high density and high magnetic flux density, can meet the characteristic of small overall thickness and high relative magnetic conductivity, and can meet 100% magnetic reflux when being applied to a catheter pump motor by testing, meanwhile, hysteresis torque phenomenon is avoided, the motor is started smoothly, and the eddy current loss is extremely low.
A second object of the present invention is to provide a method for manufacturing the magnetic conductive sleeve.
According to the preferable technical scheme, metal powder or block of iron and chromium, silicon, nickel, aluminum, titanium, yttrium oxide, molybdenum, manganese, cobalt and carbon are proportioned, are fed into a vacuum induction furnace to be smelted in a vacuum atmosphere of not lower than 1900 ℃, and the obtained molten steel is poured to obtain alloy blanks, annealed, electroslag remelting, feeding, cooling, forged into a cylinder shape in a forging furnace at a temperature of not lower than 1900 ℃, and then machined into a complete cylinder shape, and the obtained sleeve is subjected to air blowing tempering for 5 hours at 1100 ℃ to obtain the magnetic conduction sleeve.
After the alloy powder is smelted by a vacuum induction furnace, the gas content in the alloy is obviously reduced, but because an oxide crucible is adopted and a steel ingot casting method is adopted for casting during the smelting of the vacuum induction furnace, fine oxide slag inclusion still remains in the alloy, dendrites of the alloy are coarse, and local segregation exists in alloy components. In order to solve the problems, the alloy needs to be subjected to electroslag remelting, which is a technical requirement for deep processing of the alloy. Electroslag remelting is a smelting method by using resistance heat generated when current passes through slag as a heat source, and has the important purposes of refining pure metal and obtaining a clean, uniform and compact ingot, and the ingot subjected to electroslag remelting has the advantages of high purity, less nonmetallic inclusion, smooth, clean, uniform and compact ingot surface, uniform metallographic structure and chemical composition and the like. Electroslag remelting is a key link of the whole preparation process, and the basic control parameters are judged and adjusted according to whether the basic control parameters and the technical and economic indexes specified by the smelting process are reasonable or not, so that the whole process is stable in an optimal state as much as possible.
Those skilled in the art are aware that in order to prevent thrombus from entering the motor interior, a flowing backflush fluid is typically injected between the rotor and stator of the motor, most of which is a chloride-containing fluid, which requires the stator to have reliable corrosion resistance. The forged magnetically permeable sleeve is subjected to a heat treatment process in which aluminum at the grain boundaries oxidizes partially to aluminum oxide and is distributed between the grain boundaries and along the stator surface. Since alumina is a poor electrical conductor, iron crystals are insulated from each other, forming an insulating layer on the surface, thereby forming an insulating layer and a chemically inert layer to prevent blood from entering.
The annealing comprises the steps of heating the alloy blank to 1050-1200 ℃, preserving heat for 2-4 hours, cooling to 550-600 ℃ along with a furnace, and discharging and air cooling. The hardness of the annealed soft magnetic material finished product is reduced, the forging processability is improved, the residual stress and the stable size of the alloy can be reduced, the deformation and crack tendency are reduced, meanwhile, the crystal grains can be refined, the structure is adjusted, the structure defect is eliminated, and the alloy with better compactness is obtained. And the cylindrical sleeve has a continuous, constant wall thickness, which is a metal alloy having a crystal structure, has soft magnetic properties, and can minimize losses caused by hysteresis and by magnetic inversion.
The electroslag remelting is carried out for 1-2 hours, so that alloy bars are fully melted, shrinkage is generated in the process of converting a casting into a solid from a liquid, if the liquid is not timely supplied, shrinkage holes are generated in the casting to discard the casting, therefore, the liquid is supplied to the casting to prevent shrinkage holes before solidification of the casting, feeding operation is carried out, the voltage is regulated to 25-55V, the current is 1.5-4.5 KA in the feeding period, the duration is 15-35 minutes, the current is reduced, the depth of a molten pool is reduced, the solidification speed is relatively improved, and the liquid metal is continuously filled, so that the feeding purpose is achieved, and the alloy bars are cooled after feeding power failure.
It should be noted that the velocity of the blowing air is small when the sleeve is tempered at 1100 ℃, ensuring a slow, stable entry of air, during which the aluminium at the grain boundaries will be partly oxidized to aluminium oxide and distributed between the grain boundaries and along the surface of the shell. Thereafter, the sleeve surface will have a thin insulating ceramic layer.
Since the entire catheter pump is guided transvascularly to the heart chamber, the volume of the entire catheter pump is as small as possible, and the magnetic sleeve, which is a component of the catheter pump, has a wall thickness of 0.03mm or less.
Further, the wall thickness of the magnetic conductive sleeve is 0.2mm-0.28mm, preferably 0.25mm.
The relative magnetic conductivity of the magnetic conductive sleeve is more than or equal to 99.8 percent.
The relative magnetic permeability of the magnetic conductive sleeve is more than or equal to 99.9%, and is preferably 100%.
The machined circular tubular magnetic conductive sleeve has no gap in the whole circumference, so that the magnetic resistance is reduced, the magnetic loss of magnetic reflux is reduced to the minimum, and the motor current required by the required driving power is reduced. The magnetic conductive sleeve after smelting, electroslag remelting and heat treatment has high internal density, and the rigidity and corrosion resistance are greatly improved.
A third object of the present invention is to provide a hollow cup motor with high torque and small volume using a magnetically conductive sleeve as described above.
As the preferable technical scheme, the hollow cup motor comprises a motor shell, wherein a stator assembly and a rotor assembly are coaxially and radially arranged in the shell at intervals, the rotor assembly comprises a rotating shaft which is axially limited and circumferentially matched with the shell through a bearing and a permanent magnet arranged on the rotating shaft, a hollow cup coil forming the stator assembly is arranged in a magnetic conduction sleeve, and the sleeve is the magnetic conduction sleeve.
In the above scheme, in the conventional permanent magnet synchronous motor, hysteresis and eddy current loss are generated in the stator core due to the existence of the stator core, and these losses are proportional to the 1.3 th power of the rotation frequency of the rotor, and when the rotor rotates at high speed, huge losses are generated in the stator core; therefore, the invention adopts the hollow cup coil, the stator core is eliminated, and the loss of the stator core is avoided, so that the torque pulsation can be eliminated, and the output torque stability is higher; more importantly, the magnetic conduction sleeve is arranged on the periphery of the hollow cup coil, so that the reflux rate of magnetic flux is improved, and the torque of the motor is improved.
A fourth object of the present invention is to provide a catheter pump which uses the magnetic sleeve as described above and has a large torque and a large pump blood flow.
As a preferred solution, a catheter pump, the proximal and distal ends of a drive unit are attached to the catheter assembly and the cannula assembly, respectively, said drive unit being a hollow cup motor as described above.
The hollow cup motor is used as a driving unit of the catheter pump, and compared with the original traditional motor, the motor with the same outer diameter can provide higher torque, increase the blood flow of the whole catheter pump and meet the physiological function of a human body.
Drawings
FIG. 1 is a schematic diagram of a coreless motor according to the present invention;
fig. 2 is a flow chart of a process for preparing a magnetically permeable sleeve.
Detailed Description
The present invention will now be described in further detail by reference to the accompanying drawings, which are provided for illustrative purposes only and are not intended to limit the scope of the present invention.
The magnetic conductive sleeve comprises the following components in percentage by mass: 15% -18% of chromium, 0.5% -4% of silicon, 0.2% -0.5% of nickel, 3.5% -5.75% of aluminum, 0.2% -0.6% of titanium, 0.3% -0.7% of yttrium oxide, 0.2% -0.3% of molybdenum, 0.1% -0.3% of manganese, 0.01% -0.3% of cobalt, 0.001% -0.1% of carbon, the balance of iron and other unavoidable impurities, and the content of the other unavoidable impurities is less than 0.9%. Mixing metal powder or block of iron and chromium, silicon, nickel, aluminum, titanium, yttrium oxide, molybdenum, manganese, cobalt and carbon according to a proportion, feeding the mixture into a vacuum induction furnace, smelting the mixture in a vacuum atmosphere at a temperature of not lower than 1900 ℃, pouring the obtained molten steel to obtain alloy blanks, annealing, electroslag remelting, feeding, cooling, forging the alloy blanks into cylindrical bars at a temperature of not lower than 1900 ℃ in a forging furnace, machining the cylindrical bars into sleeves, and tempering the sleeves at a temperature of 1100 ℃ for 5 hours by blowing air to obtain the magnetic conductive sleeve 12. Wherein the characteristics of the alloy components are shown in Table 1:
TABLE 1
| Component (A) | Content/% | Performance of |
| Chromium (Cr) | 15-18 | Good corrosion resistance, and can reduce the strength of vortex |
| Aluminum (Al) | 3.5-5.75 | The aluminum oxide is obtained by chemical reaction to form an insulating layer |
| Titanium | 0.2-0.6 | High strength and corrosion resistance |
| Carbon (C) | 0.001~0.1 | High hardness and stability |
| Yttria (Yttrium oxide) | 0.3-0.7 | Contributing to the increase in resistivity |
| Manganese (Mn) | 0.1~0.3 | Has deoxidizing, desulfurizing and regulating effects, such as preventing formation of carbide at grain edge of steel, and also increasing strength, toughness and hardenability of steel |
| Cobalt (Co) | 0.01~0.3 | Cobalt is the production heat-resistantImportant raw materials of alloy, hard alloy, corrosion-resistant alloy and magnetic alloy |
| Nickel (Ni) | 0.2-0.5 | Hard ductile ferromagnetic metals that are highly polished and corrosion resistant |
| Silicon (Si) | 0.5-4 | Increasing the resistivity and maximum permeability of iron |
| Molybdenum (Mo) | 0.2-0.3 | High corrosion resistance, high strength and good wear resistance |
| Iron (Fe) | Allowance of | The alloy steel is made of iron and a small amount of carbon, is not easy to demagnetize after magnetization, is a hard magnetic material with excellent performance, and has the characteristics of good ductility and good electric and heat conductivity |
As can be seen from table 1, the alloy contains components with high strength, good corrosion resistance and high magnetic permeability, so as to ensure that the strength and corrosion resistance of the magnetic conductive sleeve 12 meet the requirements; at the same time, the alloy also contains aluminum, and under the action of oxygen, the aluminum can be oxidized to formSince alumina is a poor electrical conductor, the iron crystals are insulated from each other to prevent blood ingress. And the insulating alumina layer will realize eddy current reduction, so that grooving or axial layering structure on the magnetic conduction sleeve is not needed, gaps are not formed on the whole circumference surface of the magnetic conduction sleeve 12, magnetic resistance is reduced, and magnetic loss of magnetic backflow is causedThe consumption is minimized, thereby reducing the motor current required for the required drive power.
The formulations according to examples 1 to 8 of the present invention are shown in Table 2:
TABLE 2
| The components and the content percent | Chromium (Cr) | Aluminum (Al) | Titanium | Carbon (C) | Yttria (Yttrium oxide) | Manganese (Mn) | Cobalt (Co) | Nickel (Ni) | Silicon (Si) | Molybdenum (Mo) | Iron (Fe) | Relative permeability% | Corrosion resistance |
| Example 1 | 15 | 4 | 0.3 | 0.02 | 0.4 | 0.1 | 0.2 | 0.2 | 0.8 | 0.2 | 78.78 | 100 | Excellent in |
| Example 2 | 16 | 4 | 0.4 | 0.03 | 0.5 | 0.1 | 0.2 | 0.3 | 1.2 | 0.24 | 77.03 | 100 | Excellent in |
| Example 3 | 17 | 4 | 0.5 | 0.04 | 0.6 | 0.1 | 0.2 | 0.4 | 1.6 | 0.28 | 75.28 | 100 | Excellent in |
| Example 4 | 18 | 4 | 0.3 | 0.05 | 0.4 | 0.1 | 0.2 | 0.5 | 2 | 3 | 71.45 | 100 | Excellent in |
| Example 5 | 15 | 5 | 0.4 | 0.06 | 0.5 | 0.2 | 0.2 | 0.2 | 2.4 | 0.2 | 75.84 | 100 | Excellent in |
| Examples6 | 16 | 5 | 0.5 | 0.07 | 0.6 | 0.2 | 0.2 | 0.3 | 2.8 | 0.24 | 74.09 | 100 | Excellent in |
| Example 7 | 17 | 5 | 0.4 | 0.08 | 0.5 | 0.2 | 0.2 | 0.4 | 3.2 | 0.28 | 72.74 | 100 | Excellent in |
| Example 8 | 18 | 5 | 0.5 | 0.09 | 0.6 | 0.2 | 0.2 | 0.5 | 3.8 | 0.3 | 70.81 | 100 | Excellent in |
It can be seen from table 2 that the novel alloy material is adopted, the cylindrical pipe body is formed through machining, the thickness is small, the requirement of the catheter pump is met, and an oxidation insulating layer is formed on the surface of the cylindrical pipe body through a special heat treatment process, so that the novel alloy material is very powerful for the catheter pump, and the corrosion resistance of the stator can be improved through the isolation effect of the oxidation layer. Because of the insulating layer on the surface of the magnetic conductive sleeve 12, the magnetic conductive sleeve 12 can be used as a motor shell directly as a preferred scheme, and the motor shell 30 is not required to be arranged outside, so that the outer diameter of the whole motor is further reduced. The alloy prepared by the special preparation process has high density and high magnetic flux density, can fully fill the thickness of the magnetic sleeve 12 and has the characteristic of high relative magnetic conductivity, and experimental tests prove that when the magnetic sleeve 12 is applied to a catheter pump motor, 100% magnetic reflux can be met, meanwhile, hysteresis phenomenon is avoided, the motor is started smoothly, and the eddy current loss is extremely low.
The present invention employs the following detection methods, unless otherwise indicated:
1. relative permeability of
The GB/T14986.4-2018 soft magnetic alloy is adopted, the hollow cup coil is arranged in the magnetic conduction sleeve 12, magnetic fields are detected on the inner periphery and the outer periphery of the magnetic conduction sleeve 12 respectively by using a Tesla gauge, and then the intensity of the inner magnetic field and the intensity of the outer magnetic field are compared.
2. Corrosion resistance
According to the corrosion salt solution week immersion test of GB/T19746-2018 metals and alloys, the magnetic conduction sleeve is immersed in 0.9 wt% physiological saline, immersed for 72 hours at 37 ℃, and whether rust points and corrosion points exist on the surface of the magnetic conduction sleeve 12 are observed.
Compared with the stator core formed by overlapping the conventional silicon steel sheets, the excellent technical effects of the magnetic conduction sleeve 12 in the invention are shown in the following table 3:
TABLE 3 Table 3
| Material | Silicon steel sheet | Broken Morse alloy | Magnetic conduction sleeve |
| Voltage (V) | 18 | 18 | 18 |
| Current (mA) | 926 | 1160 | 1040 |
| Maximum load rotation speed (R) | 42400 | 43000 | 47000 |
| Power (W) | 16.5 | 19.5 | 18.2 |
| Start-up state | Difficult to start | Difficult to start | Smooth start-up |
| Flow min/L Glycerol 30% + Water | 2.6 | 2.8 | 3.5 |
| Thickness (mm) | 0.25 | 0.25 | 0.25 |
| Starting current (mA) | 280 | 245 | 310 |
| Whether or not to leak magnetic flux | Is that | Is that | Whether or not |
| Magnetic reflow | 75% | 80% | 100% |
| Corrosion resistance | A great deal of rust points | Small amount of rust spot | Rust-free |
| Processing technology | Complex and complex | In general | In general |
As can be seen from Table 3, the motor made of the ferrite soft magnetic material of the present invention has the advantages of larger torque, larger flow, smooth starting, better corrosion resistance, meeting the requirement of 100% relative permeability, and no increase in complexity of the processing technique.
In summary, the magnetic conductive sleeve 12 manufactured by the special material and the special process has no gaps on the whole circumferential surface, has high internal density, and can meet the requirement of small thickness of the magnetic conductive sleeve 12 and has the characteristic of high relative magnetic conductivity; and the surface of the magnetic conduction sleeve 12 is provided with an insulating layer, so that the magnetic conduction sleeve 12 can also be directly used as a shell of the motor, and the outer diameter of the whole motor is further reduced. When the magnetic conduction sleeve 12 is applied to the motor of the catheter pump, compared with the original traditional motor, the motor with the same outer diameter can provide higher torque, increase the blood flow of the whole catheter pump and meet the physiological function of a human body.
The above description of the embodiments of the present invention is not intended to limit the present invention, and those skilled in the art can make various changes or modifications according to the present invention without departing from the spirit of the present invention, and shall fall within the scope of the claims of the present invention.
Claims (12)
1. The magnetic conduction sleeve is characterized by comprising the following components in percentage by mass: 15% -18% of chromium, 0.5% -4% of silicon, 0.2% -0.5% of nickel, 3.5% -5.75% of aluminum, 0.2% -0.6% of titanium, 0.3% -0.7% of yttrium oxide, 0.2% -0.3% of molybdenum, 0.1% -0.3% of manganese, 0.01% -0.3% of cobalt, 0.001% -0.1% of carbon, the balance of iron and other unavoidable impurities, and the content of the other unavoidable impurities is less than 0.9%.
2. A method of manufacturing a magnetically permeable sleeve according to claim 1, wherein: mixing metal powder or block of iron and chromium, silicon, nickel, aluminum, titanium, yttrium oxide, molybdenum, manganese, cobalt and carbon according to a proportion, feeding the mixture into a vacuum induction furnace, smelting the mixture in a vacuum atmosphere at a temperature of not lower than 1900 ℃, pouring the obtained molten steel to obtain alloy blanks, annealing, electroslag remelting, feeding, cooling, forging the alloy blanks into cylindrical bars at a temperature of not lower than 1900 ℃ in a forging furnace, machining the cylindrical bars into sleeves, and tempering the sleeves at a temperature of 1100 ℃ for 5 hours by blowing air to obtain the magnetic conductive sleeves.
3. The method of manufacturing a magnetically permeable sleeve according to claim 2, wherein: the annealing comprises the steps of heating the alloy blank to 1050-1200 ℃, preserving heat for 2-4 hours, cooling to 550-600 ℃ along with a furnace, and discharging and air cooling.
4. The method of manufacturing a magnetically permeable sleeve according to claim 2, wherein: the electroslag remelting time is 1-2 h, the feeding period is adjusted to 25-55V, the current is 1.5-4.5 KA, and the duration is 15-35 min.
5. The method of manufacturing a magnetically permeable sleeve according to claim 2, wherein: the wall thickness of the magnetic conduction sleeve is less than or equal to 0.03mm.
6. The method of manufacturing a magnetically permeable sleeve according to claim 5, wherein: the wall thickness of the magnetic conductive sleeve is 0.2mm-0.28mm.
7. The method of manufacturing a magnetically permeable sleeve according to claim 6, wherein: the wall thickness of the magnetic conductive sleeve is 0.25mm.
8. The method of manufacturing a magnetically permeable sleeve according to claim 5, wherein: the relative magnetic conductivity of the magnetic conductive sleeve is more than or equal to 99.8 percent.
9. The method of manufacturing a magnetically permeable sleeve according to claim 8, wherein: the relative magnetic conductivity of the magnetic conductive sleeve is more than or equal to 99.9 percent.
10. The method of manufacturing a magnetically permeable sleeve according to claim 9, wherein: the relative permeability of the magnetically permeable sleeve is 100%.
11. The utility model provides a coreless motor, includes motor casing (30), coaxial, radial interval has arranged stator module (10) and rotor subassembly (20) in casing (30), and rotor subassembly (20) are including constituting axial spacing, circumference normal running fit's pivot (22) through bearing and casing (30), and install permanent magnet (21) on pivot (22), and coreless coil (11) that constitute stator module (10) are arranged in magnetic conduction sleeve (12), its characterized in that: the magnetically permeable sleeve (12) is a magnetically permeable sleeve according to claim 1 or a magnetically permeable sleeve manufactured according to any one of claims 2 to 7.
12. A catheter pump, a proximal end and a distal end of a drive unit attached to a catheter assembly and a cannula assembly, respectively, characterized in that: the drive unit is the coreless motor of claim 11.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102899585A (en) * | 2012-11-09 | 2013-01-30 | 宁波市鄞州商业精密铸造有限公司 | High-hardness and high-abrasion-resistance iron alloy material |
| CN102899586A (en) * | 2012-11-09 | 2013-01-30 | 宁波市鄞州商业精密铸造有限公司 | Iron alloy material and preparation method |
| CN106655649A (en) * | 2016-09-12 | 2017-05-10 | 马幼鸣 | High-speed high-power density AC servo motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899585A (en) * | 2012-11-09 | 2013-01-30 | 宁波市鄞州商业精密铸造有限公司 | High-hardness and high-abrasion-resistance iron alloy material |
| CN102899586A (en) * | 2012-11-09 | 2013-01-30 | 宁波市鄞州商业精密铸造有限公司 | Iron alloy material and preparation method |
| CN106655649A (en) * | 2016-09-12 | 2017-05-10 | 马幼鸣 | High-speed high-power density AC servo motor |
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