CN114405790A - Method for improving heat conduction and heat dissipation through nano-deposition graphene coating - Google Patents
Method for improving heat conduction and heat dissipation through nano-deposition graphene coating Download PDFInfo
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Abstract
The invention discloses a method for improving heat conduction and heat dissipation through a nano deposited graphene coating, which comprises the following steps: mixing and curing graphene, a carbon nano tube, nano silicon dioxide, nano aluminum oxide, a magnetoelectric ion complexing agent, an ion regulator, an ion crosslinking agent, an ion curing agent, a pH regulator, a nano dispersant, an ionic solution stabilizer and deionized water at normal temperature and normal pressure to form stable curing liquid; nano-dispersing the curing liquid for 3-28 hours to form stable nano-dispersion liquid; curing the stable nano dispersion liquid at normal temperature and normal pressure to form stable graphene nano deposition liquid for later use; the graphene coating is nano-deposited on the surface of the heat dissipation device, and the directionally arranged uniform and stable graphene micro-fins are formed on the surface of the device, so that the heat dissipation surface area is remarkably increased, and the surface area can be increased by more than 2 times at most; meanwhile, the graphene thermal conductivity and the thermal radiation coefficient are relatively higher, and the heat conduction and heat dissipation performance of the heat dissipation device is integrally improved.
Description
Technical Field
The invention belongs to the technical field of heat conduction and heat dissipation, and particularly relates to a method for improving heat conduction and heat dissipation through a nano-deposition graphene coating.
Background
The urgent requirements of the 5G technology (base station and matched terminal electronic devices) and new energy (mainly batteries, power supplies and charging piles) on intensification, miniaturization, precision and controllability put forward higher requirements on the whole energy exchange and heat conduction and heat dissipation, and the requirements are increased by more than 5 times. The lightweight miniaturized heat conduction and heat dissipation device for aerospace needs more efficient and stable heat conduction and heat dissipation, and ensures stable operation of the whole unit. At present, in order to effectively improve heat conduction and heat dissipation, the following five approaches are mainly adopted: firstly, the increase of the heat dissipation area inevitably leads to the increase of the volume and the weight, and the increase of the energy consumption and the reduction of the operation stability; second, material replacement, such as replacement of aluminum with copper, has limited lift, significantly increased weight, and significantly increased cost; thirdly, the heat pipe is introduced, so that concentrated heat can be quickly conducted away basically, but if the heat dissipation is not timely, the cold end and the hot end of the heat pipe reach thermal balance, and the heat pipe fails. In addition, the packaging of the heat pipe and the damage and aging caused by other factors have hidden troubles; fourthly, air cooling is introduced, the volume is increased, noise is generated, and additional unstable factors are increased due to the stability of fan operation; fifthly, liquid cooling is introduced, the current technology of intensive liquid cooling with high requirements is not mature, and the intensive liquid cooling is particularly used for packaging and preventing the leakage of the cooling liquid;
in summary, the existing heat dissipation technologies all have their own drawbacks or shortcomings, and therefore we propose a method for improving heat conduction and heat dissipation through nano-deposition of graphene coating.
Disclosure of Invention
The present invention is directed to a method for improving heat conduction and heat dissipation through a nano-deposited graphene coating, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for improving heat conduction and heat dissipation through a nano-deposition graphene coating comprises the following steps:
A. mixing and curing graphene, a carbon nano tube, nano silicon dioxide, nano aluminum oxide, a magnetoelectric ion complexing agent, an ion regulator, an ion crosslinking agent, an ion curing agent, a pH regulator, a nano dispersant, an ionic solution stabilizer and deionized water at normal temperature and normal pressure to form stable curing liquid;
B. dispersing the curing liquid at low temperature for 3-28 hours to form stable nano dispersion liquid;
C. curing the stable nano dispersion liquid at normal temperature and normal pressure to form stable graphene nano deposition liquid for later use;
D. a production line tool is arranged on the heat dissipation part;
E. pretreating a radiating component, namely performing water-based circulating oil removal, grease removal and deburring at normal temperature and normal pressure, and reserving the pretreated radiating component for later use;
F. pre-treating the heat dissipation part by normal temperature and normal pressure magnetization pre-treatment;
G. c, the magnetized and pretreated heat dissipation part enters the graphene nano deposition liquid prepared in the step C, the magnetic field of the graphene nano deposition liquid is controlled to be matched with the magnetic field of the magnetized and pretreated heat dissipation part through an external magnetic field matching device system, graphene nano liquid phase deposition is achieved by controlling the polarity of the magnetic field, and a stable, uniform and directional graphene nano coating mainly containing graphene is formed on the surface of the heat dissipation part;
H. removing uncontrolled deposition ions and deposits on the surface of the nano-deposition graphene heat dissipation component in a normal-temperature normal-pressure circulating liquid phase matched with magnetic field control to form a magnetic field controlled nano-deposition graphene coating heat dissipation component;
I. the magnetic field controlled nano-deposition graphene coating heat dissipation component heats the coating at normal pressure to rearrange and densify the coating;
J. the coating rearrangement densification coating is functionalized according to the requirement;
K. the functionalized heat dissipation component is subjected to normal-pressure heating vapor deposition, the rearranged and densified graphene coating after liquid phase deposition is subjected to forced arrangement and complete crosslinking densification again under the action of a matched magnetic field, the vapor deposition repaired liquid phase deposition defect coating is homogenized, and meanwhile, the liquid phase deposition graphene units are arranged in an oriented manner again, and complete densification is realized;
l, cooling the heat dissipation part subjected to vapor deposition to normal temperature, and packaging the finished product, wherein the quality of the finished product is qualified.
Further, 0.5-8.6 parts of graphene, 0.1-5.2 parts of carbon nano tube, 0.8-18.5 parts of nano silicon dioxide, 0.6-7.8 parts of nano aluminum oxide, 0.2-7.7 parts of magnetoelectric ion complexing agent, 0.1-2.8 parts of ion regulator, 0.1-4.2 parts of ion cross-linking agent, 0.2-6.8 parts of ion curing agent, 0.1-2.2 parts of PH regulator, 0.01-2.2 parts of nano dispersant, 0.1-3.2 parts of ionic solution stabilizer and 15-55 parts of deionized water.
Further, the aging time in the step A is 24 to 48 hours.
Further, the average particle size of the dispersion liquid in the solid phase in the step B is 5 nanometers to 12 micrometers.
Further, the curing time in the step C is 24-96 hours.
Further, the normal temperature in the step is 5 ℃ to 40 ℃.
Further, the low temperature in the above step is 5 ℃ to 28 ℃.
Further, the water content of the coating in the step I is lower than 5%, and the heating temperature range is 45-280 ℃.
Further, the temperature range for warming in the step K is 50-550 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. the graphene coating is nano-deposited on the surface of the heat dissipation device, and the directionally arranged uniform and stable graphene micro-fins are formed on the surface of the device, so that the heat dissipation surface area is remarkably increased, and the surface area can be increased by more than 2 times at most; meanwhile, the graphene thermal conductivity and the thermal radiation coefficient are relatively higher, and the heat conduction and heat dissipation performance of the heat dissipation device is integrally improved.
2. The xenogenesis is connected the heat dissipation part, through nanometer deposition graphite alkene coating, at xenogenesis connection position, the microgap that exists can obtain intact filling and connection, shows to reduce xenogenesis and connects heat conduction thermal resistance, can reduce the thermal resistance more than 3 times at most.
3. The nano-deposition graphene coating on the surface of the heat dissipation device has an antistatic characteristic, so that heat conduction and heat dissipation caused by adhesion influence of dust or foreign matters adsorbed by static can be effectively reduced, and the heat conduction and heat dissipation of the heat dissipation device are more stable.
4. The nano deposition graphene coating technology of the technology is a medium-low temperature nano deposition technology combining liquid deposition and gas deposition, and can realize directional deposition of graphene coatings on heat dissipation components in a large scale at relatively low cost and high efficiency. The coating can realize full coverage and almost zero dead angle and comprises a complicated ware-shaped heat dissipation part and a micro-channel heat radiator.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a structural diagram of the interior of a nano-deposited graphene coating prepared according to the present invention;
fig. 3 is a schematic diagram illustrating that the difference between the first embodiment and the second embodiment of the present invention is not large according to the difference between the nano-silica and the content of graphene and nano-alumina, which are correspondingly adjusted.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example one
Referring to fig. 1 and 2, the present invention provides a technical solution: a method for improving heat conduction and heat dissipation through a nano-deposition graphene coating comprises the following steps:
A. mixing and curing 7 parts of graphene, 3 parts of carbon nano tubes, 12 parts of nano silicon dioxide, 5 parts of nano aluminum oxide, 5.2 parts of magnetoelectric ion complexing agent, 2.5 parts of ion regulator, 2.6 parts of ion cross-linking agent, 4 parts of ion curing agent, 1.1 parts of pH regulator, 1.2 parts of nano dispersant, 1.1 parts of ionic solution stabilizer and 55 parts of deionized water at normal temperature and pressure for 40 hours to form stable curing liquid;
B. dispersing the curing liquid at low temperature for 20 hours to form stable nano dispersion liquid;
C. curing the stable nano dispersion liquid for 30 hours at normal temperature and normal pressure to form stable graphene nano deposition liquid for later use;
D. a production line tool is arranged on the heat dissipation part;
E. pretreating a radiating component, namely performing water-based circulating oil removal, grease removal and deburring at normal temperature and normal pressure, and reserving the pretreated radiating component for later use;
F. pre-treating the heat dissipation part by normal temperature and normal pressure magnetization pre-treatment;
G. c, the magnetized and pretreated heat dissipation part enters the graphene nano deposition liquid prepared in the step C, the magnetic field of the graphene nano deposition liquid is controlled to be matched with the magnetic field of the magnetized and pretreated heat dissipation part through an external magnetic field matching device system, graphene nano liquid phase deposition is achieved by controlling the polarity of the magnetic field, and a stable, uniform and directional graphene nano coating mainly containing graphene is formed on the surface of the heat dissipation part;
H. the liquid phase is circulated at normal temperature and normal pressure matched with the magnetic field control, namely, non-controlled deposition ions and deposits are removed after the liquid phase is circularly used, so that the magnetic field controlled nano-deposition graphene coating heat dissipation component is formed;
I. the magnetic field controlled nano-deposition graphene coating heat dissipation component heats the coating at normal pressure to rearrange and densify the coating, the water content of the coating is lower than 5%, and the heating temperature is 200 ℃;
J. the coating rearrangement densification coating is functionalized according to the requirement;
K. the functionalized heat dissipation component is heated to 300 ℃ under normal pressure for vapor deposition, the rearranged and densified graphene coating after liquid phase deposition is subjected to forced rearrangement and complete crosslinking densification again under the action of a matched magnetic field, the vapor deposition is used for repairing the liquid phase deposition defect coating for homogenization, and meanwhile, the liquid phase deposition graphene units are arranged in a directional mode again to realize complete densification;
l, cooling the heat dissipation part subjected to vapor deposition to normal temperature, and packaging the finished product, wherein the quality of the finished product is qualified.
In this example, the average particle size of the solid phase of the dispersion in step B is 5 nm to 12 μm.
In this example, the room temperature in the above step was 25 ℃.
In this example, the low temperature in the above step was 25 ℃.
The nano deposited graphene coating and the heat dissipation component are combined in an ion level manner, the bonding strength is high, the maximum bonding strength can reach more than 20MPa through a pull-open method test, and the common coating generally has the bonding strength of about 3 MPa; the nano deposited graphene coating achieves ion-level density, the coating has higher hardness, the maximum pencil scratch can reach 9H, the flexibility is better, and the hundred-grid test is more guaranteed; the graphene units and other heat dissipation units in the nano deposited graphene coating realize microscopic directional arrangement, heat conduction and heat dissipation are facilitated, the heat conductivity in the arrangement direction can reach about 80W/M.K at most, the microscopic units of a common coating have no directionality, and the heat conductivity of the coating can reach about 4W/M.K; the directional micro-fin formed by the nano deposited graphene coating can increase the surface area by more than 2 times at most, the increase of the common coating by about 20 percent is already calculated well, the heat dissipation area is obviously increased through the micro-fin, and the heat dissipation performance of the coating can be directly and effectively improved.
The nano-deposition graphene coating realizes full coverage of the coating and almost zero dead angle by combining liquid phase deposition and vapor deposition double deposition, and realizes that a common coating process of a complex workpiece can not reach places, particularly a microchannel workpiece; the nano deposited graphene coating microscopic units are arranged in a more compact and directional mode, the temperature resistance is higher and can reach more than 550 ℃ at most, and the common electrophoretic coating generally has the temperature resistance of not more than 220 ℃;
the nano graphene coating deposition technology is basically completed at normal pressure and relatively low temperature, is more energy-saving, and has high deposition speed and high efficiency compared with CVD and PVD;
the nano deposition graphene coating technology can realize large-scale planned production in batches, the daily coating area of a single large production line can reach more than 10 ten thousand square meters at most, the cost is advantageous, and the coating technology can replace part of coating requirements with high requirements.
The nano-deposition graphene coating technology has high automation degree of production line and stable quality, can effectively solve the most economic way of high-requirement heat dissipation, does not need to change the specification of heat dissipation accessories, does not need to open a die, and does not influence assembly.
The nano deposited graphene coating realizes synchronous solution of heat dissipation, corrosion prevention and static prevention, and can be used in severe environments or extremely severe environments.
The thickness of the nano deposited graphene coating can be accurately controlled, the highest precision tolerance can be controlled within +/-1 micron, and the deviation of a common coating is normal above 10 microns.
Example two
Referring to fig. 1 and 2, the present invention provides a technical solution: a method for improving heat conduction and heat dissipation through a nano-deposition graphene coating is characterized by comprising the following steps:
A. mixing and curing 7 parts of graphene, 4 parts of carbon nano tubes, 13 parts of nano silicon dioxide, 4 parts of nano aluminum oxide, 5.2 parts of magnetoelectric ion complexing agent, 1.5 parts of ion regulator, 2.6 parts of ion cross-linking agent, 4 parts of ion curing agent, 1.1 parts of pH regulator, 1.2 parts of nano dispersant, 1.1 parts of ionic solution stabilizer and 55 parts of deionized water at normal temperature and pressure for 40 hours to form stable curing liquid;
B. dispersing the curing liquid at low temperature for 20 hours to form stable nano dispersion liquid;
C. curing the stable nano dispersion liquid for 30 hours at normal temperature and normal pressure to form stable graphene nano deposition liquid for later use;
D. a production line tool is arranged on the heat dissipation part;
E. pretreating a radiating component, namely performing water-based circulating oil removal, grease removal and deburring at normal temperature and normal pressure, and reserving the pretreated radiating component for later use;
F. pre-treating the heat dissipation part by normal temperature and normal pressure magnetization pre-treatment;
G. c, the magnetized and pretreated heat dissipation part enters the graphene nano deposition liquid prepared in the step C, the magnetic field of the graphene nano deposition liquid is controlled to be matched with the magnetic field of the magnetized and pretreated heat dissipation part through an external magnetic field matching device system, graphene nano liquid phase deposition is achieved by controlling the polarity of the magnetic field, and a stable, uniform and directional graphene nano coating mainly containing graphene is formed on the surface of the heat dissipation part;
H. the liquid phase is circulated at normal temperature and normal pressure matched with the magnetic field control, namely, non-controlled deposition ions and deposits are removed after the liquid phase is circularly used, so that the magnetic field controlled nano-deposition graphene coating heat dissipation component is formed;
I. the magnetic field controlled nano-deposition graphene coating heat dissipation component heats the coating at normal pressure to rearrange and densify the coating, the water content of the coating is lower than 5%, and the heating temperature is 200 ℃;
J. the coating rearrangement densification coating is functionalized according to the requirement;
K. the functionalized heat dissipation component is heated to 300 ℃ under normal pressure for vapor deposition, the rearranged and densified graphene coating after liquid phase deposition is subjected to forced rearrangement and complete crosslinking densification again under the action of a matched magnetic field, the vapor deposition is used for repairing the liquid phase deposition defect coating for homogenization, and meanwhile, the liquid phase deposition graphene units are arranged in a directional mode again to realize complete densification;
l, cooling the heat dissipation part subjected to vapor deposition to normal temperature, and packaging the finished product, wherein the quality of the finished product is qualified.
In this example, the average particle size of the solid phase of the dispersion in step B is 5 nm to 12 μm.
In this example, the room temperature in the above step was 25 ℃.
The nano deposited graphene coating and the heat dissipation component are combined in an ion level manner, the bonding strength is high, the maximum bonding strength can reach more than 20MPa through a pull-open method test, and the common coating generally has the bonding strength of about 3 MPa; the nano deposited graphene coating achieves ion-level density, the coating has higher hardness, the maximum pencil scratch can reach 9H, the flexibility is better, and the hundred-grid test is more guaranteed; the graphene units and other heat dissipation units in the nano deposited graphene coating realize microscopic directional arrangement, heat conduction and heat dissipation are facilitated, the heat conductivity in the arrangement direction can reach about 80W/M.K at most, the microscopic units of a common coating have no directionality, and the heat conductivity of the coating can reach about 4W/M.K; the directional micro-fin formed by the nano deposited graphene coating can increase the surface area by more than 2 times at most, the increase of the common coating by about 20 percent is already calculated well, the heat dissipation area is obviously increased through the micro-fin, and the heat dissipation performance of the coating can be directly and effectively improved.
The nano-deposition graphene coating realizes full coverage of the coating and almost zero dead angle by combining liquid phase deposition and vapor deposition double deposition, and realizes that a common coating process of a complex workpiece can not reach places, particularly a microchannel workpiece; the nano deposited graphene coating microscopic units are arranged in a more compact and directional mode, the temperature resistance is higher and can reach more than 550 ℃ at most, and the common electrophoretic coating generally has the temperature resistance of not more than 220 ℃;
the nano graphene coating deposition technology is basically completed at normal pressure and relatively low temperature, is more energy-saving, and has high deposition speed and high efficiency compared with CVD and PVD;
the nano deposition graphene coating technology can realize large-scale planned production in batches, the daily coating area of a single large production line can reach more than 10 ten thousand square meters at most, the cost is advantageous, and the coating technology can replace part of coating requirements with high requirements.
The nano-deposition graphene coating technology has high automation degree of production line and stable quality, can effectively solve the most economic way of high-requirement heat dissipation, does not need to change the specification of heat dissipation accessories, does not need to open a die, and does not influence assembly.
The nano deposited graphene coating realizes synchronous solution of heat dissipation, corrosion prevention and static prevention, and can be used in severe environments or extremely severe environments.
The thickness of the nano deposited graphene coating can be accurately controlled, the highest precision tolerance can be controlled within +/-1 micron, and the deviation of a common coating is normal above 10 microns.
The difference between the first embodiment and the second embodiment is the difference between the nano-silica and the corresponding adjustment of the contents of graphene and nano-alumina, which can be obtained from fig. 3, and the difference between the two performances is not large.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (9)
1. A method for improving heat conduction and heat dissipation through a nano-deposition graphene coating is characterized by comprising the following steps:
A. mixing and curing graphene, a carbon nano tube, nano silicon dioxide, nano aluminum oxide, a magnetoelectric ion complexing agent, an ion regulator, an ion crosslinking agent, an ion curing agent, a pH regulator, a nano dispersant, an ionic solution stabilizer and deionized water at normal temperature and normal pressure to form stable curing liquid;
B. dispersing the curing liquid at low temperature for 3-28 hours to form stable nano dispersion liquid;
C. curing the stable nano dispersion liquid at normal temperature and normal pressure to form stable graphene nano deposition liquid for later use;
D. a production line tool is arranged on the heat dissipation part;
E. pretreating a radiating component, namely performing water-based circulating oil removal, grease removal and deburring at normal temperature and normal pressure, and reserving the pretreated radiating component for later use;
F. pre-treating the heat dissipation part by normal temperature and normal pressure magnetization pre-treatment;
G. c, the magnetized and pretreated heat dissipation part enters the graphene nano deposition liquid prepared in the step C, the magnetic field of the graphene nano deposition liquid is controlled to be matched with the magnetic field of the magnetized and pretreated heat dissipation part through an external magnetic field matching device system, graphene nano liquid phase deposition is achieved by controlling the polarity of the magnetic field, and a stable, uniform and directional graphene nano coating mainly containing graphene is formed on the surface of the heat dissipation part;
H. removing uncontrolled deposition ions and deposits on the surface of the nano-deposition graphene heat dissipation component in a normal-temperature normal-pressure circulating liquid phase matched with magnetic field control to form a magnetic field controlled nano-deposition graphene coating heat dissipation component;
I. the magnetic field controlled nano-deposition graphene coating heat dissipation component heats the coating at normal pressure to rearrange and densify the coating;
J. the coating rearrangement densification coating is functionalized according to the requirement;
K. the functionalized heat dissipation component is subjected to normal-pressure heating vapor deposition, the rearranged and densified graphene coating after liquid phase deposition is subjected to forced arrangement and complete crosslinking densification again under the action of a matched magnetic field, the vapor deposition repaired liquid phase deposition defect coating is homogenized, and meanwhile, the liquid phase deposition graphene units are arranged in an oriented manner again, and complete densification is realized;
l, cooling the heat dissipation part subjected to vapor deposition to normal temperature, and packaging the finished product, wherein the quality of the finished product is qualified.
2. The method of claim 1, wherein the method comprises the following steps: 0.5-8.6 parts of graphene, 0.1-5.2 parts of carbon nano tube, 0.8-18.5 parts of nano silicon dioxide, 0.6-7.8 parts of nano aluminum oxide, 0.2-7.7 parts of magnetoelectric ion complexing agent, 0.1-2.8 parts of ion regulator, 0.1-4.2 parts of ion cross-linking agent, 0.2-6.8 parts of ion curing agent, 0.1-2.2 parts of pH regulator, 0.01-2.2 parts of nano dispersant, 0.1-3.2 parts of ionic solution stabilizer and 15-55 parts of deionized water.
3. The method of claim 1, wherein the method comprises the following steps: the curing time in the step A is 24 to 48 hours.
4. The method of claim 1, wherein the method comprises the following steps: and in the step B, the average particle size of the solid phase of the dispersion liquid is 5 nanometers to 12 micrometers.
5. The method of claim 1, wherein the method comprises the following steps: the curing time in the step C is 24-96 hours.
6. The method of claim 1, wherein the method comprises the following steps: the normal temperature in the steps is 5-40 ℃.
7. The method of claim 1, wherein the method comprises the following steps: the low temperature in the above step is 5-28 ℃.
8. The method of claim 1, wherein the method comprises the following steps: in the step I, the water content of the coating is lower than 5%, and the heating temperature range is 45-280 ℃.
9. The method of claim 1, wherein the method comprises the following steps: the temperature range of the heating in the step K is 50-550 ℃.
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