CN104498823A - High-saturation high-resistance alloy and preparation method thereof special for nuclear magnetic resonance spectroscope - Google Patents
High-saturation high-resistance alloy and preparation method thereof special for nuclear magnetic resonance spectroscope Download PDFInfo
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- CN104498823A CN104498823A CN201510020040.7A CN201510020040A CN104498823A CN 104498823 A CN104498823 A CN 104498823A CN 201510020040 A CN201510020040 A CN 201510020040A CN 104498823 A CN104498823 A CN 104498823A
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Abstract
The invention belongs to the technical field of alloying metal and particularly relates to a magnetic resonance imaging dedicated alloy and a preparation method thereof. The dedicated alloy is Fe-Co-Al fe-co-based alloy, the mass percent of the Co content is 5%-35%, the mass percent of Al content is 2%-6%, the mass percent of Si content is 0.5%-1%, the mass percent of Mo content is 2%-3%, required impurities include C, P, S and Ni which are smaller than 0.01%, and the rest is Fe. The electrical resistivity of the alloy is larger than 50*10(-8) ohm/m, the saturation flux density is larger than 1.4-2.3T, the initial permeability is larger than 2000, the magnetic permeability at 1.0-1.5T is larger than 10000, and preparation is performed by a vacuum metallurgy method. According to the magnetic resonance imaging dedicated alloy and the preparation method thereof, high-saturation magnetic field induction intensity and high electrical resistivity can be achieved, the alloy is a magnetic pole material that is used for 1.0T-2.1T permanent magnet magnetic resonance imager, and the anti-eddy effect is good.
Description
Technical field
The invention belongs to mr imaging technique field, be specifically related to saturated high-resistance alloy of the special height of a kind of nuclear magnetic resonance spectrometer and preparation method thereof.
Background technology
Medical nuclear magnetic resonance imaging system superposes fast-changing gradient magnetic in uniform magnetic field, system has X, Y, Z tri-groups of gradients by changing X, Y, Z gradient magnitude determination spatial information, so the precision in magnetic field and speed determine nuclear magnetic resonance picture quality.The principal element affecting gradient magnetic precision and speed is from the eddy current that the magnetic pole head that imaging space is nearest induces in magnetic magnet.Eddy current is the electric current retroaction of electric field formation and the result in magnetic field of conductor ` induction in variation magnetic field.Current solution has amorphous magnetic metal material to make magnetic pole and adopts thin slice to laminate system 3. and adopt silicon steel piecemeal to splice.Above scheme all can only use because magneticsaturation magnetic induction is too low in the magnetic resonance system of below 0.7T.Also high saturated soft magnetic materials is had in the world but the too low eddy current of resistivity is too large.
Alloy of the present invention provides a kind of pole material of high resistivity high saturated magnetic induction for High field strenghth MRI, provides the material of the high-performance of low eddy current high field intensity for nuclear magnetic resonance.This patent alloy good can be operated in the magnetic resonance imaging system under the field intensity of 1.0T-2.1T.
To require according to material cost and saturation magnetization can require and eddy current performance requriements adjusts the ratio of various element.
Summary of the invention
The object of the present invention is to provide a kind of magneticsaturation magnetic induction high, saturated high-resistance alloy of the special height of the nuclear magnetic resonance spectrometer that resistivity is high and preparation method thereof.
The saturated high-resistance alloy of the special height of nuclear magnetic resonance spectrometer provided by the present invention is Fe-Co-Al iron Co-based alloy, wherein:
The mass percentage content of Co is 5-35%,
The mass percentage content of rare earth Al is 5-12%,
Si mass percentage content 0.5-1%,
Mo mass percentage content 2-3%,
All the other are iron,
Impurity requires C, P, S, Ni<0.01%.
The resistivity >50*10 of alloy of the present invention
-8Ω/M, saturation induction density >2.0T, initial magnetic permeability >2000, at 1.0-1.5T permeability >10000.
Alloy of the present invention adopts vacuum metallurgy legal system standby, and concrete preparation process is as follows:
By the content ratio of alloy compositions, highly purified Al, Co, Si, Mo and iron are placed in crucible;
Rise to 1100-1200 DEG C with the speed of 15-25 DEG C/h in a hydrogen atmosphere, keep 130-150 hour; Room temperature is dropped to 2-3 DEG C/min of speed.
Alloy thermal treatment of the present invention adopts hydrogen annealing process, and eliminate the elements such as C, P, S, O, N, annealing temperature determines according to the transition temperature of high-temperature metallography figure.High alumina low cobalt alloy annealing temperature 1100 DEG C-1200 DEG C maintenance more than 100 hours mainly hydrogen and impurity reaction generates the impurity in corresponding gas elimination material, slowly drops to room temperature.Low aluminium high cobalt alloy annealing temperature eliminates impurity 900-950 DEG C of scope, because there is phase transformation so need to carry out lowering the temperature after phase transformation terminates to obtain homogeneous phase at 850 DEG C.
Alloy provided by the present invention has high saturation magnetic field induction, and high resistivity material is for the pole material in 1.0T-2.1T permanent magnet magnetic resonance imager, has good anti-eddy effect.
Embodiment
Embodiment 1(is from Naming board HTMR1J14): in crucible, put into highly purified Al mass percent be in proportion 12%, Co mass percent be 6%, Si mass percent be 1%, Mo mass percent is 3%, and all the other are iron.
Thermal treatment process: thermal treatment process: rise to 1100-1200 DEG C with 20 DEG C/h under hydrogen atmosphere, keeps 130 hours; Room temperature is dropped to 2 DEG C/min.
Performance: saturation magnetic field 1.4T resistivity 90*10
-8Ω/m works at 1.0T-1.2T magnetic resonance system
Embodiment 2(is from Naming board HTMR1J23): in crucible, put into highly purified Al mass percent be in proportion 6%, Co mass percent be 35%, Si mass percent be 0.5%, Mo mass percent is 2%, and all the other are iron.
Thermal treatment process: rise to 900-930 DEG C with 20 DEG C/h under hydrogen atmosphere, keeps 130 hours; Be down to 850 DEG C to keep 4 hours, drop to 700 DEG C with 1 DEG C/min of speed, drop to room temperature with 4 DEG C/min.
Performance: saturation magnetic field 2.3T resistivity 56*10
-8Ω/m is in 1.4T-2.1T magnetic resonance imaging system system works.
Claims (2)
1. the saturated high-resistance alloy of the special height of nuclear magnetic resonance spectrometer, is characterized in that for Fe-Co-Al iron Co-based alloy, wherein:
The mass percentage content of Co is 5-35%,
The mass percentage content of rare earth Al is 5-12%,
Si mass percentage content 0.5-1%,
Mo mass percentage content 2-3%,
All the other are iron,
Impurity requires C, P, S, Ni<0.01%.
2. prepare the preparation method of alloy as claimed in claim 1, it is characterized in that step is as follows:
Highly purified Al, Co, Si, Mo and iron is put in proportion in crucible;
Rise to 1100-1200 DEG C with 15-25 DEG C/h speed in a hydrogen atmosphere, keep 130-150 hour; Room temperature is dropped to 2-3 DEG C/min of speed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510020040.7A CN104498823B (en) | 2015-01-15 | 2015-01-15 | A kind of nuclear magnetic resonance spectrometer saturated high-resistance alloy of special height and preparation method thereof |
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| CN201510020040.7A CN104498823B (en) | 2015-01-15 | 2015-01-15 | A kind of nuclear magnetic resonance spectrometer saturated high-resistance alloy of special height and preparation method thereof |
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| CN104498823A true CN104498823A (en) | 2015-04-08 |
| CN104498823B CN104498823B (en) | 2016-08-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195423A (en) * | 2020-09-28 | 2021-01-08 | 安泰科技股份有限公司 | Composite heat treatment method for optimizing magnetic property of amorphous wire |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710521A (en) * | 2009-12-18 | 2010-05-19 | 浙江大学 | Iron-based nanocrystalline soft magnetic alloy with electromagnetic interference resistance and preparation method thereof |
| CN104036902A (en) * | 2014-05-28 | 2014-09-10 | 浙江明贺钢管有限公司 | Preparing method of metal magnetic powder core |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710521A (en) * | 2009-12-18 | 2010-05-19 | 浙江大学 | Iron-based nanocrystalline soft magnetic alloy with electromagnetic interference resistance and preparation method thereof |
| CN104036902A (en) * | 2014-05-28 | 2014-09-10 | 浙江明贺钢管有限公司 | Preparing method of metal magnetic powder core |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195423A (en) * | 2020-09-28 | 2021-01-08 | 安泰科技股份有限公司 | Composite heat treatment method for optimizing magnetic property of amorphous wire |
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| CN104498823B (en) | 2016-08-24 |
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