CN110571004A - Superparamagnetism electromagnetic composite material, preparation method thereof and high-sensitivity electromagnetic valve - Google Patents
Superparamagnetism electromagnetic composite material, preparation method thereof and high-sensitivity electromagnetic valve Download PDFInfo
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- CN110571004A CN110571004A CN201910854238.3A CN201910854238A CN110571004A CN 110571004 A CN110571004 A CN 110571004A CN 201910854238 A CN201910854238 A CN 201910854238A CN 110571004 A CN110571004 A CN 110571004A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/0036—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties showing low dimensional magnetism, i.e. spin rearrangements due to a restriction of dimensions, e.g. showing giant magnetoresistivity
- H01F1/0045—Zero dimensional, e.g. nanoparticles, soft nanoparticles for medical/biological use
- H01F1/0063—Zero dimensional, e.g. nanoparticles, soft nanoparticles for medical/biological use in a non-magnetic matrix, e.g. granular solids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
Abstract
The invention provides a superparamagnetic electromagnetic composite material, which comprises a raw material A and a raw material B, wherein the raw material A is nano ferroferric oxide, and the raw material B is epoxy resin or polytetrafluoroethylene; the mass percentage of the raw material A is 10-70%. And in addition, a preparation method of the electromagnetic composite material is also provided, and the raw material A and the raw material B are weighed firstly, then added into a ball mill, ball-milled and mixed uniformly at the rotating speed of 40-50 r/min for 10-20 h, then put into a mould to be pressed and formed under the forming pressure of 5-25 MPa, and after the completion, the curing reaction is carried out at the temperature of 180-360 ℃ for 90-120 min, so that the superparamagnetic electromagnetic composite material is obtained. The preparation method is adopted to prepare the static iron core and the movable iron core with superparamagnetism of the electromagnetic valve, and the problem that the sensitivity cannot be improved due to hysteresis of the electromagnet in the conventional electromagnetic valve can be solved.
Description
Technical Field
The invention belongs to the technical field of composite materials, and particularly relates to a superparamagnetic electromagnetic composite material, a preparation method thereof and a high-sensitivity electromagnetic valve.
Background
in modern industrial manufacturing, the degree of automation is increasing and the use of automatic control elements is undoubtedly becoming more widespread. The performance parameters of the solenoid valve as a control element in the system are an important link in the control system. The most important performance parameter of the solenoid valve is the response time of the solenoid valve, and the sensitivity is higher as the response time is shorter.
At present, the response time of electromagnetic valves of various manufacturers is different, but the response speed of the electromagnetic valves produced in China is generally slower than that of the electromagnetic valves of foreign brands, and the service life and the stability of the electromagnetic valves are also poor. The response time of the solenoid valve is mainly determined by the sensitivity of the electromagnet of the core component.
Electromagnets of electromagnetic valves used in the current market are all made of soft magnetic materials, and have certain lag in response speed. At present, many researchers do much work in this respect, and are dedicated to reducing the coercivity of electromagnetic materials, and they all achieve certain results, but since their research is based on soft magnetic materials, although the coercivity of materials can be greatly reduced, the coercivity always exists and cannot be completely eliminated. Therefore, the development of a novel zero-coercivity electromagnetic valve material is a subject with great market application prospect.
Under the condition of small size, when the anisotropy energy is reduced to be equivalent to the thermal motion energy, the magnetization direction is not fixed in an easy magnetization direction any more, and the easy magnetization direction is changed irregularly to become a superparamagnetic material. The superparamagnetic material is different from the traditional magnetic material in that the superparamagnetic material has no magnetic hysteresis loop and zero coercive force, so that the change relation of magnetism along with the magnetic field intensity of a magnetization field is a straight line, and no hysteresis exists. It is clear that the problem of hysteresis can be solved very well if the electromagnet material can be used as an electromagnetic valve.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
in view of the above-mentioned shortcomings of the prior art, a first object of the present invention is to provide a superparamagnetic electromagnetic composite material, which has the advantages of zero coercivity and no hysteresis loop.
the second objective of the present invention is to provide a method for preparing a superparamagnetic electromagnetic composite material, so as to prepare a superparamagnetic electromagnetic composite material.
The third purpose of the present invention is to provide a high-sensitivity electromagnetic valve, wherein the static iron core and the movable iron core are prepared from the electromagnetic composite material, and the present invention aims to solve the technical problem that the sensitivity cannot be improved due to the hysteresis of the electromagnet in the conventional electromagnetic valve.
In order to achieve the first purpose, the invention adopts the following technical scheme:
A superparamagnetic electromagnetic composite material comprises a raw material A and a raw material B, wherein the raw material A is nano ferroferric oxide, and the raw material B is epoxy resin or polytetrafluoroethylene; according to the mass percentage, the nano ferroferric oxide accounts for 10-70%.
In the superparamagnetic electromagnetic composite material, the nano ferroferric oxide accounts for 50 percent by mass.
In order to achieve the second purpose, the invention adopts the following technical scheme:
A method of making an electromagnetic composite material as described above, the method comprising the steps of:
S100: weighing a raw material A and a raw material B;
S200: respectively adding the weighed raw material A and the weighed raw material B into a ball mill for ball milling and mixing;
s300: after ball milling and mixing, putting the uniformly mixed raw materials into a die, and performing compression molding to obtain a green body;
s400: and carrying out a curing reaction on the obtained green body to obtain the superparamagnetic electromagnetic composite material.
In the preparation method of the electromagnetic composite material, the ratio of the ball milling medium added into the ball mill to the total amount of the raw material A and the raw material B is 1: 1.
in the preparation method of the electromagnetic composite material, the ball milling medium is zirconia grinding balls.
In the preparation method of the electromagnetic composite material, the rotating speed of the ball mill is 40-50 r/min, and the ball milling time is 10-20 h.
In the preparation method of the electromagnetic composite material, the particle size of the raw material A is 10-30 nm.
In the preparation method of the electromagnetic composite material, the green body forming pressure is 5-25 MPa.
In the preparation method of the electromagnetic composite material, the curing reaction temperature is 180-360 ℃, and the curing time is 90-120 min.
In order to achieve the third object, the invention adopts the following technical scheme:
A high-sensitivity electromagnetic valve is provided with a static iron core and a movable iron core which are made of the electromagnetic composite material.
Has the advantages that:
the invention takes nano ferroferric oxide and epoxy resin or nano ferroferric oxide and polytetrafluoroethylene as raw materials, and compounds the raw materials under certain conditions to prepare a novel superparamagnetic electromagnetic composite material with zero coercive force, which is used for replacing the traditional metal soft magnet.
The raw material A and the raw material B are uniformly mixed through a ball mill, then the mixture is placed into a mould to be pressed and formed to obtain a green body, and then the green body is solidified at a certain temperature to obtain the electromagnetic composite material with a certain shape. In addition, the electromagnetic composite material has good cutting performance, can be made into any shape according to the requirement, has simple process, is easy for large-scale production and has high practical value.
And finally, preparing a static iron core and a movable iron core of the electromagnetic valve by using the electromagnetic composite material so as to improve the sensitivity of the electromagnetic valve.
Drawings
fig. 1 is a flow chart of a method for preparing an electromagnetic composite material according to the present invention.
Detailed Description
the invention provides a superparamagnetic electromagnetic composite material and a preparation method thereof, and also provides a high-sensitivity electromagnetic valve, so that the purpose, the technical scheme and the effect of the invention are clearer and clearer, and the invention is further described in detail by referring to the attached drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a superparamagnetic electromagnetic composite material, which comprises a raw material A and a raw material B, wherein the raw material A is nano ferroferric oxide, and the raw material B is epoxy resin or polytetrafluoroethylene; according to the mass percentage, the nano ferroferric oxide accounts for 10-70%. For example, the nano ferroferric oxide accounts for 10%, 30%, 50% and 70% by mass; more preferably, the nano ferroferric oxide is 50%.
In addition, as shown in fig. 1, the present invention provides a method for preparing the electromagnetic composite material, which comprises the following steps:
S100: weighing a raw material A and a raw material B;
S200: respectively adding the weighed raw material A and the weighed raw material B into a ball mill for ball milling and mixing;
s300: after ball milling and mixing, putting the uniformly mixed raw materials into a die, and performing compression molding to obtain a green body;
S400: and carrying out a curing reaction on the obtained green body to obtain the superparamagnetic electromagnetic composite material.
Wherein the ratio of the ball milling medium added into the ball mill to the total amount of the raw material A and the raw material B is 1: 1. preferably, the ball milling medium is zirconia balls, that is, the ratio of zirconia to raw materials is 1:1, and the raw materials comprise a raw material A and a raw material B.
The rotating speed of the ball mill is 40-50 r/min, such as 40r/min, 45r/min and 50r/min, and the ball milling time is 10-20 h, such as 10h, 15h and 20 h. More preferably, the rotating speed is 45r/min and the time is 15 h.
The particle size of the raw material A is 10-30 nm.
the green body forming pressure is 5-25 MPa, such as 5MPa, 15MPa, 20MPa and 25 MPa.
The temperature of the curing reaction is 180-360 ℃, such as 180 ℃, 270 ℃ and 360 ℃; the curing time is 90-120 min, such as 90min, 100min and 120 min.
Firstly, preparing nano ferroferric oxide powder. Weighing a proper amount of anhydrous ferric chloride according to a formula, dissolving ferrous sulfate heptahydrate and polyacrylic acid in water, adjusting the pH value to 9 by using ammonia water to obtain a black colloidal solution, supplementing a proper amount of polyacrylic acid solution, performing ultrafiltration for a period of time at 50 ℃, performing ultrafiltration concentration for 5 times in a Millipore ultrafiltration device (the aperture of an ultrafiltration membrane is 10KD), removing impurities, dispersing in water, and performing vacuum drying at 60 ℃ for 12 hours to obtain black nano Fe3O4The particle size of the powder is distributed in a range of 10-30 nm.
Example 1:
weighing 20g of black nano ferroferric oxide powder and 180g of epoxy resin, then adding the powder and 200g of zirconia grinding balls into a ball mill for ball milling and mixing, wherein the rotating speed of the ball mill is 40r/min, and the ball milling time is 10 hours. And then, putting the uniformly mixed powder into a die for dry pressing and molding, wherein the molding pressure is 5MPa, and the powder can be made into green parts in the shapes of the static iron core and the movable iron core of the electromagnetic valve according to actual requirements. And then, placing the obtained green part into a resistance furnace for curing reaction at 270 ℃ for 120min, and cooling to room temperature after curing to obtain the electromagnetic valve part made of the nano ferroferric oxide/epoxy resin composite material, such as a static iron core and a movable iron core.
The electromagnetic valve part is assembled to an electromagnetic valve for testing, the valve opening time is less than 2 seconds, the valve closing time is less than 5 seconds, the valve closing time is shortened by more than 20 seconds compared with that of the existing electromagnetic valve adopting a general electromagnetic material, the performance is obviously improved, the closing time of the valve after the gas appliance is flamed out is shortened, and the use safety of the gas appliance is improved.
Example 2:
60g of black nano ferroferric oxide powder and 140g of epoxy resin are weighed, and then the powder and 200g of zirconia grinding balls are added into a ball mill together for ball milling and mixing, wherein the rotating speed of the ball mill is 45r/min, and the ball milling time is 10 hours. And then, putting the uniformly mixed powder into a die for dry pressing and molding, wherein the molding pressure is 15MPa, and the powder can be made into green parts in the shapes of the static iron core and the movable iron core of the electromagnetic valve according to actual requirements. And then, placing the obtained green part into a resistance furnace for curing reaction at 270 ℃ for 100min, and cooling to room temperature after curing to obtain the electromagnetic valve part made of the nano ferroferric oxide/epoxy resin composite material, such as a static iron core and a movable iron core.
The electromagnetic valve part is assembled to an electromagnetic valve for testing, the valve opening time is less than 2 seconds, the valve closing time is less than 5 seconds, the valve closing time is shortened by more than 20 seconds compared with that of the existing electromagnetic valve adopting a general electromagnetic material, the performance is obviously improved, the closing time of the valve after the gas appliance is flamed out is shortened, and the use safety of the gas appliance is improved.
Example 3:
Weighing 100g of black nano ferroferric oxide powder and 100g of epoxy resin, then adding the powder and 200g of zirconia grinding balls into a ball mill for ball milling and mixing, wherein the rotating speed of the ball mill is 45r/min, and the ball milling time is 15 h. And then, putting the uniformly mixed powder into a die for dry pressing and molding, wherein the molding pressure is 20MPa, and the powder can be made into green parts in the shapes of the static iron core and the movable iron core of the electromagnetic valve according to actual requirements. And then, placing the obtained green part into a resistance furnace for curing reaction at 180 ℃ for 90min, and cooling to room temperature after curing to obtain the electromagnetic valve part made of the nano ferroferric oxide/epoxy resin composite material, such as a static iron core and a movable iron core.
The electromagnetic valve part is assembled to an electromagnetic valve for testing, the valve opening time is less than 2 seconds, the valve closing time is less than 5 seconds, the valve closing time is shortened by more than 20 seconds compared with that of the existing electromagnetic valve adopting a general electromagnetic material, the performance is obviously improved, the closing time of the valve after the gas appliance is flamed out is shortened, and the use safety of the gas appliance is improved.
Example 4:
140g of black nano ferroferric oxide powder and 60g of epoxy resin are weighed, and then the weighed powder and 200g of zirconia grinding balls are added into a ball mill together for ball milling and mixing, wherein the rotating speed of the ball mill is 50r/min, and the ball milling time is 15 hours. And then, putting the uniformly mixed powder into a die for dry pressing and molding, wherein the molding pressure is 25MPa, and the powder can be made into green parts in the shapes of the static iron core and the movable iron core of the electromagnetic valve according to actual requirements. And then, placing the obtained green part into a resistance furnace for curing reaction at 180 ℃ for 90min, and cooling to room temperature after curing to obtain the electromagnetic valve part made of the nano ferroferric oxide/epoxy resin composite material, such as a static iron core and a movable iron core.
the electromagnetic valve part is assembled to an electromagnetic valve for testing, the valve opening time is less than 2 seconds, the valve closing time is less than 5 seconds, the valve closing time is shortened by more than 20 seconds compared with that of the existing electromagnetic valve adopting a general electromagnetic material, the performance is obviously improved, the closing time of the valve after the gas appliance is flamed out is shortened, and the use safety of the gas appliance is improved.
Example 5:
Weighing 20g of black nano ferroferric oxide powder and 180g of polytetrafluoroethylene powder, adding the powder and 200g of zirconia grinding balls into a ball mill for ball milling and mixing, wherein the rotating speed of the ball mill is 45r/min, and the ball milling time is 15 hours. And then, putting the uniformly mixed powder into a die for dry pressing and molding, wherein the molding pressure is 20MPa, and the powder can be made into green parts in the shapes of the static iron core and the movable iron core of the electromagnetic valve according to actual requirements. And then, placing the obtained green body part into a resistance furnace for curing reaction, slowly heating to 270 ℃, preserving the temperature for 90min, and cooling to room temperature along with the furnace after curing to obtain the electromagnetic valve part made of the nano ferroferric oxide/polytetrafluoroethylene composite material, such as a static iron core and a movable iron core.
The electromagnetic valve part is assembled to an electromagnetic valve for testing, the valve opening time is less than 2 seconds, the valve closing time is less than 5 seconds, the valve closing time is shortened by more than 20 seconds compared with that of the existing electromagnetic valve adopting a general electromagnetic material, the performance is obviously improved, the closing time of the valve after the gas appliance is flamed out is shortened, and the use safety of the gas appliance is improved.
Example 6:
60g of black nano ferroferric oxide powder and 140g of polytetrafluoroethylene powder are weighed, and then the powder and 200g of zirconia grinding balls are added into a ball mill together for ball milling and mixing, wherein the rotating speed of the ball mill is 45r/min, and the ball milling time is 15 hours. And then, putting the uniformly mixed powder into a die for dry pressing and molding, wherein the molding pressure is 20MPa, and the powder can be made into green parts in the shapes of the static iron core and the movable iron core of the electromagnetic valve according to actual requirements. And then, placing the obtained green body part into a resistance furnace for curing reaction, slowly heating to 270 ℃, preserving the temperature for 100min, and cooling to room temperature along with the furnace after curing to obtain the electromagnetic valve part made of the nano ferroferric oxide/polytetrafluoroethylene composite material, such as a static iron core and a movable iron core.
The electromagnetic valve part is assembled to an electromagnetic valve for testing, the valve opening time is less than 2 seconds, the valve closing time is less than 5 seconds, the valve closing time is shortened by more than 20 seconds compared with that of the existing electromagnetic valve adopting a general electromagnetic material, the performance is obviously improved, the closing time of the valve after the gas appliance is flamed out is shortened, and the use safety of the gas appliance is improved.
Example 7:
Weighing 100g of black nano ferroferric oxide powder and 100g of polytetrafluoroethylene powder, then adding the powder and 200g of zirconia grinding balls into a ball mill for ball milling and mixing, wherein the rotating speed of the ball mill is 45r/min, and the ball milling time is 15 h. And then, putting the uniformly mixed powder into a die for dry pressing and molding, wherein the molding pressure is 15MPa, and the powder can be made into green parts in the shapes of the static iron core and the movable iron core of the electromagnetic valve according to actual requirements. And then, placing the obtained green body part into a resistance furnace for curing reaction, slowly heating to 360 ℃, preserving heat for 120min, and cooling to room temperature along with the furnace after curing to obtain the electromagnetic valve part made of the nano ferroferric oxide/polytetrafluoroethylene composite material, such as a static iron core and a movable iron core.
The electromagnetic valve part is assembled to an electromagnetic valve for testing, the valve opening time is less than 2 seconds, the valve closing time is less than 5 seconds, the valve closing time is shortened by more than 20 seconds compared with that of the existing electromagnetic valve adopting a general electromagnetic material, the performance is obviously improved, the closing time of the valve after the gas appliance is flamed out is shortened, and the use safety of the gas appliance is improved.
Example 8:
140g of black nano ferroferric oxide powder and 60g of polytetrafluoroethylene powder are weighed, and then the black nano ferroferric oxide powder and 200g of zirconia grinding balls are added into a ball mill together for ball milling and mixing, wherein the rotating speed of the ball mill is 50r/min, and the ball milling time is 10 hours. And then, putting the uniformly mixed powder into a die for dry pressing and molding, wherein the molding pressure is 15MPa, and the powder can be made into green parts in the shapes of the static iron core and the movable iron core of the electromagnetic valve according to actual requirements. And then, placing the obtained green body part into a resistance furnace for curing reaction, slowly heating to 360 ℃, preserving heat for 120min, and cooling to room temperature along with the furnace after curing to obtain the electromagnetic valve part made of the nano ferroferric oxide/polytetrafluoroethylene composite material, such as a static iron core and a movable iron core.
the electromagnetic valve part is assembled to an electromagnetic valve for testing, the valve opening time is less than 2 seconds, the valve closing time is less than 5 seconds, the valve closing time is shortened by more than 20 seconds compared with that of the existing electromagnetic valve adopting a general electromagnetic material, the performance is obviously improved, the closing time of the valve after the gas appliance is flamed out is shortened, and the use safety of the gas appliance is improved.
In addition, the invention also provides a high-sensitivity electromagnetic valve which is provided with a static iron core and a movable iron core which are made of the electromagnetic composite material. The static iron core and the movable iron core of the electromagnetic valve have the characteristics of no hysteresis loop and zero coercive force, and the problem that the sensitivity cannot be improved due to hysteresis of an electromagnet in the conventional electromagnetic valve is solved, so that the electromagnetic valve provided by the invention has quick response time and improved sensitivity.
in conclusion, the nano ferroferric oxide and the epoxy resin or the nano ferroferric oxide and the polytetrafluoroethylene are used as raw materials and are compounded under certain conditions to prepare the novel zero-coercivity superparamagnetic electromagnetic composite material which is used for replacing the traditional metal soft magnet.
the raw material A and the raw material B are uniformly mixed through a ball mill, then the mixture is placed into a mould to be pressed and formed to obtain a green body, and then the green body is solidified at a certain temperature to obtain the electromagnetic composite material with a certain shape. In addition, the electromagnetic composite material has good cutting performance, can be made into any shape according to the requirement, has simple process, is easy for large-scale production and has high practical value.
and finally, preparing a static iron core and a movable iron core of the electromagnetic valve by using the electromagnetic composite material so as to improve the sensitivity of the electromagnetic valve.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A superparamagnetic electromagnetic composite material is characterized by comprising a raw material A and a raw material B, wherein the raw material A is nano ferroferric oxide, and the raw material B is epoxy resin or polytetrafluoroethylene; according to the mass percentage, the nano ferroferric oxide accounts for 10-70%.
2. The superparamagnetic electromagnetic composite material according to claim 1, wherein said nano ferroferric oxide is 50% by mass.
3. A method for the preparation of an electromagnetic composite material according to claim 1 or 2, characterized in that it comprises the steps of:
s100: weighing a raw material A and a raw material B;
s200: respectively adding the weighed raw material A and the weighed raw material B into a ball mill for ball milling and mixing;
S300: after ball milling and mixing, putting the uniformly mixed raw materials into a die, and performing compression molding to obtain a green body;
S400: and carrying out a curing reaction on the obtained green body to obtain the superparamagnetic electromagnetic composite material.
4. The method for preparing an electromagnetic composite material according to claim 3, wherein the ratio of the ball milling media added by the ball mill to the total amount of the raw material A and the raw material B is 1: 1.
5. the method of making an electromagnetic composite material as set forth in claim 4 wherein the ball milling media is zirconia milling balls.
6. the preparation method of the electromagnetic composite material according to claim 3, wherein the rotation speed of the ball mill is 40-50 r/min, and the ball milling time is 10-20 h.
7. The method for preparing the electromagnetic composite material according to claim 3, wherein the particle size of the raw material A is 10-30 nm.
8. the method of preparing an electromagnetic composite material as claimed in claim 3, wherein the green body forming pressure is 5 to 25 MPa.
9. the method for preparing the electromagnetic composite material according to claim 3, wherein the curing reaction temperature is 180-360 ℃ and the curing time is 90-120 min.
10. A high-sensitivity electromagnetic valve characterized by being provided with a stationary iron core and a movable iron core made of the electromagnetic composite material as recited in claim 1 or 2.
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2019
- 2019-09-10 CN CN201910854238.3A patent/CN110571004A/en active Pending
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| JPH03163805A (en) * | 1989-11-22 | 1991-07-15 | Three Bond Co Ltd | Super paramagnetic compound material |
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| CN101477862A (en) * | 2007-12-31 | 2009-07-08 | 中国科学技术大学 | Polymer based composite magnetic material having temperature responsiveness and preparation thereof |
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Application publication date: 20191213 |
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