CN109735790B - Composite heat dissipation ceramic coating for LED lamp and preparation method thereof - Google Patents
Composite heat dissipation ceramic coating for LED lamp and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a composite heat dissipation ceramic coating for an LED lamp and a preparation method thereof, wherein the coating sequentially comprises a substrate layer, a first transition layer, a second transition layer and a surface layer from inside to outside, and the substrate layer is composed of NiAl alloy powder; the first transition layer comprises the following components in parts by weight: 30% of NiAl alloy powder and 70% of ZrNBSiC alloy powder; the second transition layer comprises the following components in parts by weight: 70% of NiAl alloy powder and 30% of ZrNBSiC alloy powder; the component of the surface layer is ZrNBSiC alloy powder. The invention not only has the advantages of relatively simple manufacturing process and easy operation and low cost, but also can prepare the metallurgical bonding coating with high hardness, friction resistance, corrosion resistance, non-adhesion and difficult shedding, and has the characteristics of good chemical stability and high heat conduction capability without acid-base reaction.
Description
Technical Field
The invention relates to the field of LEDs (light emitting diodes), in particular to a composite heat dissipation ceramic coating for an LED lamp and a preparation method thereof.
Background
The existing preparation method for LED lamp heat dissipation and the LED lamp heat dissipation coating are easy to fall off under the action of high temperature, have poor heat conduction performance and low heat efficiency, and increase the cost invisibly. The LED lamp is an electroluminescent semiconductor material chip, silver glue or white glue is solidified on the support, then the chip and the circuit board are connected through silver wires or gold wires, the periphery of the chip and the circuit board is sealed through epoxy resin, the effect of protecting an internal core wire is achieved, and finally the shell is installed, so that the anti-seismic performance of the LED lamp is good. The lampshade of the current LED lamp is single in structure and has a certain heat dissipation effect, but the heat dissipation effect is poor, and once the heat is too high, the heat cannot be dissipated timely, so that the service life of the LED lamp is influenced.
Disclosure of Invention
The invention aims to provide a composite heat dissipation ceramic coating for an LED lamp with excellent mechanical strength and heat dissipation performance and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a composite heat dissipation ceramic coating for an LED lamp comprises a basal layer, a first transition layer, a second transition layer and a surface layer in sequence from inside to outside,
the components of the substrate layer are NiAl alloy powder;
the first transition layer comprises the following components in parts by weight: 30% of NiAl alloy powder and 70% of ZrNBSiC alloy powder;
the second transition layer comprises the following components in parts by weight: 70% of NiAl alloy powder and 30% of ZrNBSiC alloy powder;
the surface layer is made of ZrNBSiC alloy powder;
the ZrNBSiC alloy powder in the first transition layer, the second transition layer and the surface layer consists of the following components: si4N3Diamond, NB and ZrC.
The NiAl alloy powder in the base layer, the first transition layer and the second transition layer comprises the following components in parts by weight: 70-80% of Al, and the balance of Ni.
The ZrNBSiC alloy powder in the first transition layer comprises the following components in percentage by mass: si4N3: diamond: NB: ZrC ═ 5: 10: 10: 5.
the ZrNBSiC alloy powder in the second transition layer comprises the following components in percentage by mass: si4N3: diamond: NB: ZrC is 10: 30: 20: 10.
the ZrNBSiC alloy powder in the surface layer comprises the following components in percentage by mass: si4N3: diamond: NB: ZrC 15: 50: 20: 15.
the thickness of the substrate layer is 0.2-0.7 μm, the thickness of the first transition layer and the second transition layer is 0.7-1.1mm, and the thickness of the surface layer is 1-3 mm.
The preparation method of the coating comprises the following steps:
step 1): the method comprises the following steps of (1) preprocessing the surface of an LED lamp substrate, and cleaning dust, oil dirt and rust;
step 2): preheating the surface of an LED lamp substrate to 400 ℃ by using an induction heating coil, maintaining the temperature of the surface of the LED lamp substrate to be 200-400 ℃, presetting a basal layer on the surface of the LED lamp substrate by using a plasma powder spraying mode, and carrying out laser cladding to obtain the basal layer;
sequentially preparing a first transition layer, a second transition layer and a surface layer by adopting the same method in the step 2);
step 3): naturally cooling the container body to room temperature, then heating the surface of the LED lamp substrate to 400-600 ℃ by using an induction heating coil, maintaining for 6h, and then cooling to room temperature at the speed of 5-10 ℃/min to finally obtain the composite heat dissipation ceramic coating.
The technological parameters of plasma spraying in the step 1) are as follows: the working voltage is 40-80V, the angle of the spray gun is 45-90 degrees, the current is 500-800A, the distance between the muzzle of the spray gun and the inner surface of the container body is 10-50cm, the moving speed of the spray gun is 50-70cm/s, the argon flow is 20-70l/min, the helium flow is 20-60l/min, and the alloy powder flow is 15-35 g/min.
The laser cladding process parameters in the step 1) are as follows: the power is 800-.
The base layer is made of a high-temperature-resistant binder material with low melting point and good wettability of nickel-aluminum alloy, the base layer is easy to combine with the base body, the adhesion is good, and each layer of coating is gradually mixed, so that the combination performance is good, the coating is not easy to fall off, the purpose of relieving thermal stress is achieved, and cracks are avoided.
The diamond has the characteristics of high hardness, chemical stability and the like;
zirconium carbide has very good thermal and electrical conductivity, wherein the electrical conductivity is equivalent to that of metal, and the zirconium carbide is suitable for a plurality of fields such as coating of an emitter shell, coating of nuclear fuel particles, coating of a thermo-photoelectric radiator, and coating of an ultra-high temperature material;
silicon nitride has lubricity and is wear-resistant, and is an atomic crystal; it is antioxidant at high temperature, and can resist cold and hot shock, and can be heated to above 1000 deg.C in air, rapidly cooled and rapidly heated, and will not crack.
The boron nitride has the characteristics of high temperature resistance, no adhesion, corrosion resistance, high hardness, good wear resistance, good high-temperature insulation, good heat dissipation and heat conduction and the like.
The method has the characteristics of relatively simple manufacturing process, easy operation and low cost, and can prepare the metallurgical bonding coating with high hardness, friction resistance, corrosion resistance, non-adhesion and difficult shedding, and the metallurgical bonding coating has the characteristics of good chemical stability and high heat conduction capability without reacting with acid and alkali.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in FIG. 1, the composite heat dissipation ceramic coating for LED lamp of the present invention comprises a substrate layer 1, a first transition layer 2, a second transition layer 3 and a surface layer 4 in sequence from inside to outside,
the components of the substrate layer are NiAl alloy powder;
the first transition layer comprises the following components in parts by weight: 30% of NiAl alloy powder and 70% of ZrNBSiC alloy powder;
the second transition layer comprises the following components in parts by weight: 70% of NiAl alloy powder and 30% of ZrNBSiC alloy powder;
the surface layer is made of ZrNBSiC alloy powder;
the ZrNBSiC alloy powder in the first transition layer, the second transition layer and the surface layer consists of the following components: si4N3Diamond, NB and ZrC.
The NiAl alloy powder in the base layer, the first transition layer and the second transition layer comprises the following components in parts by weight: 70-80% of Al, and the balance of Ni.
The ZrNBSiC alloy powder in the first transition layer comprises the following components in percentage by mass: si4N3: diamond: NB: ZrC ═ 5: 10: 10: 5.
the mass ratio of each component of ZrNBSiC alloy powder in the second transition layerComprises the following steps: si4N3: diamond: NB: ZrC is 10: 30: 20: 10.
the ZrNBSiC alloy powder in the surface layer comprises the following components in percentage by mass: si4N3: diamond: NB: ZrC 15: 50: 20: 15.
the thickness of the substrate layer is 0.2-0.7 μm, the thickness of the first transition layer and the second transition layer is 0.7-1.1mm, and the thickness of the surface layer is 1-3 mm.
Example 1: the preparation method of the coating comprises the following steps:
step 1): the method comprises the following steps of (1) preprocessing the surface of an LED lamp substrate, and cleaning dust, oil dirt and rust;
step 2): preheating the surface of an LED lamp substrate to 400 ℃ by using an induction heating coil, maintaining the temperature of the surface of the LED lamp substrate to be 200-400 ℃, presetting a basal layer on the surface of the LED lamp substrate by using a plasma powder spraying mode, and carrying out laser cladding to obtain the basal layer;
sequentially preparing a first transition layer, a second transition layer and a surface layer by adopting the same method in the step 2);
step 3): naturally cooling the container body to room temperature, then heating the surface of the LED lamp substrate to 400 ℃ by using an induction heating coil, maintaining for 6 hours, and then cooling to room temperature at the speed of 5 ℃/min to finally obtain the composite heat dissipation ceramic coating.
The technological parameters of plasma spraying in the step 1) are as follows: the working voltage is 40V, the angle of the spray gun is 45 degrees, the current is 500A, the distance between the muzzle of the spray gun and the inner surface of the container body is 10cm, the moving speed of the spray gun is 50cm/s, the argon flow is 20l/min, the helium flow is 20l/min, and the alloy powder flow is 15 g/min.
The laser cladding process parameters in the step 1) are as follows: the power is 800W, the argon flow is 1200ml/min, the scanning speed is 2mm/s, the preheating temperature is 25 ℃, and the defocusing amount is 10 mm.
Example 2: the preparation method of the coating comprises the following steps:
step 1): the method comprises the following steps of (1) preprocessing the surface of an LED lamp substrate, and cleaning dust, oil dirt and rust;
step 2): preheating the surface of an LED lamp substrate to 400 ℃ by using an induction heating coil, maintaining the temperature of the surface of the LED lamp substrate to be 200-400 ℃, presetting a basal layer on the surface of the LED lamp substrate by using a plasma powder spraying mode, and carrying out laser cladding to obtain the basal layer;
sequentially preparing a first transition layer, a second transition layer and a surface layer by adopting the same method in the step 2);
step 3): naturally cooling the container body to room temperature, then heating the surface of the LED lamp substrate to 600 ℃ by using an induction heating coil, maintaining for 6 hours, and then cooling to room temperature at the speed of 10 ℃/min to finally obtain the composite heat dissipation ceramic coating.
The technological parameters of plasma spraying in the step 1) are as follows: the working voltage is 60V, the angle of the spray gun is 90 degrees, the current is 800A, the distance between the muzzle of the spray gun and the inner surface of the container body is 50cm, the moving speed of the spray gun is 70cm/s, the argon flow is 70l/min, the helium flow is 60l/min, and the alloy powder flow is 35 g/min.
The laser cladding process parameters in the step 1) are as follows: the power is 3500W, the argon flow is 2400ml/min, the scanning speed is 8mm/s, the preheating temperature is 400 ℃, and the defocusing amount is 30 mm.
Example 3: the preparation method of the coating comprises the following steps:
step 1): the method comprises the following steps of (1) preprocessing the surface of an LED lamp substrate, and cleaning dust, oil dirt and rust;
step 2): preheating the surface of an LED lamp substrate to 400 ℃ by using an induction heating coil, maintaining the temperature of the surface of the LED lamp substrate at 300 ℃, presetting a basal layer on the surface of the LED lamp substrate by using a plasma powder spraying mode, and carrying out laser cladding to obtain the basal layer;
sequentially preparing a first transition layer, a second transition layer and a surface layer by adopting the same method in the step 2);
step 3): naturally cooling the container body to room temperature, then heating the surface of the LED lamp substrate to 500 ℃ by using an induction heating coil, maintaining for 6 hours, and then cooling to room temperature at the speed of 8 ℃/min to finally obtain the composite heat dissipation ceramic coating.
The technological parameters of plasma spraying in the step 1) are as follows: the working voltage is 80V, the angle of the spray gun is 70 degrees, the current is 700A, the distance between the muzzle of the spray gun and the inner surface of the container body is 30cm, the moving speed of the spray gun is 60cm/s, the argon flow is 50l/min, the helium flow is 40l/min, and the alloy powder flow is 25 g/min.
The laser cladding process parameters in the step 1) are as follows: the power is 2100W, the argon flow is 1800ml/min, the scanning speed is 5mm/s, the preheating temperature is 210 ℃, and the defocusing amount is 20 mm.
In order to verify the performance of the composite heat dissipation ceramic coating for LED lamp prepared by the preparation method of the present invention, the composite heat dissipation ceramic substrate for LED lamp having the coating of the present invention in each of the above examples was tested, and compared with conventional heat dissipation substrates for LED lamp (resin substrate, epoxy glass cloth (FR4) and Metal Core Printed Circuit Board (MCPCB)), the test results are as follows:
in summary, the surface of the LED lamp substrate is heated by the induction heating coil, the basal layer is preset on the surface of the LED lamp substrate in the plasma powder spraying mode, the prepared composite heat dissipation ceramic coating material is used as a coating, laser cladding is performed, and the laser cladding process is utilized to combine specific parameters, so that the composite heat dissipation ceramic coating for the LED lamp can enable the coating to have good coating bonding force.
Claims (8)
1. The utility model provides a compound heat dissipation ceramic coating for LED lamp, includes stratum basale, first transition layer, second transition layer and surface course from interior to exterior according to the preface, its characterized in that:
the components of the substrate layer are NiAl alloy powder;
the first transition layer comprises the following components in parts by weight: 30% of NiAl alloy powder and 70% of ZrNBSiC alloy powder;
the second transition layer comprises the following components in parts by weight: 70% of NiAl alloy powder and 30% of ZrNBSiC alloy powder;
the surface layer is made of ZrNBSiC alloy powder;
the ZrNBSiC alloy powder in the first transition layer, the second transition layer and the surface layer consists of the following components: si3N4Diamond, BN and ZrC;
the preparation method of the coating comprises the following steps:
step 1): the method comprises the following steps of (1) preprocessing the surface of an LED lamp substrate, and cleaning dust, oil dirt and rust;
step 2): preheating the surface of an LED lamp substrate to 400 ℃ by using an induction heating coil, maintaining the temperature of the surface of the LED lamp substrate to be 200-400 ℃, presetting a basal layer on the surface of the LED lamp substrate by using a plasma powder spraying mode, and carrying out laser cladding to obtain the basal layer;
sequentially preparing a first transition layer, a second transition layer and a surface layer by adopting the same method in the step 2);
step 3): naturally cooling the LED lamp substrate to room temperature, then heating the surface of the LED lamp substrate to 400-600 ℃ by using an induction heating coil, maintaining for 6h, and then cooling to room temperature at the speed of 5-10 ℃/min to finally obtain the composite heat dissipation ceramic coating.
2. The composite heat dissipation ceramic coating for the LED lamp according to claim 1, wherein: the NiAl alloy powder in the base layer, the first transition layer and the second transition layer comprises the following components in parts by weight: 70-80% of Al, and the balance of Ni.
3. A method as claimed in claim 1The composite heat dissipation ceramic coating for the LED lamp is characterized in that: the ZrNBSiC alloy powder in the first transition layer comprises the following components in percentage by mass: si3N4: diamond: BN: ZrC = 5: 10: 10: 5.
4. the composite heat dissipation ceramic coating for the LED lamp according to claim 1, wherein: the ZrNBSiC alloy powder in the second transition layer comprises the following components in percentage by mass: si3N4: diamond: BN: ZrC = 10: 30: 20: 10.
5. the composite heat dissipation ceramic coating for the LED lamp according to claim 1, wherein: the ZrNBSiC alloy powder in the surface layer comprises the following components in percentage by mass: si3N4: diamond: BN: ZrC = 15: 50: 20: 15.
6. the composite heat dissipation ceramic coating for the LED lamp according to claim 1, wherein: the thickness of the basal layer is 0.2-0.7 mu m, the thickness of the first transition layer and the thickness of the second transition layer are both 0.7-1.1mm, and the thickness of the surface layer is 1-3 mm.
7. The composite heat dissipation ceramic coating for the LED lamp according to claim 1, wherein: the technological parameters of plasma spraying in the step 2) are as follows: the working voltage is 40-80V, the angle of the spray gun is 45-90 degrees, the current is 500-800A, the distance between the muzzle of the spray gun and the surface of the LED lamp substrate is 10-50cm, the moving speed of the spray gun is 50-70cm/s, the argon flow is 20-70l/min, the helium flow is 20-60l/min, and the alloy powder flow is 15-35 g/min.
8. The composite heat dissipation ceramic coating for the LED lamp according to claim 1, wherein: the laser cladding process parameters in the step 2) are as follows: the power is 800-.
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| CN111560611A (en) * | 2020-05-07 | 2020-08-21 | 上海交通大学 | Method for preparing transition layer of nickel-based coating on titanium alloy surface by laser cladding |
| CN112220331B (en) * | 2020-09-30 | 2022-01-04 | 万事泰集团(广东)技术研究有限公司 | Laser cladding non-stick pan and manufacturing method thereof |
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