CN114315324A - LED lamp heat radiation body and preparation method and application thereof - Google Patents
LED lamp heat radiation body and preparation method and application thereof Download PDFInfo
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- CN114315324A CN114315324A CN202011073885.XA CN202011073885A CN114315324A CN 114315324 A CN114315324 A CN 114315324A CN 202011073885 A CN202011073885 A CN 202011073885A CN 114315324 A CN114315324 A CN 114315324A
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Abstract
The invention provides an LED lamp radiator and a preparation method and application thereof, wherein the LED lamp radiator comprises the following raw material components in parts by weight: 92-95 parts of aluminum oxide, 0.1-5 parts of manganese dioxide and 1-8 parts of sintering aid; the alumina is industrial grade alumina with the purity not more than 99.00 percent. According to the LED lamp radiator, the specification of the raw materials in the raw material formula is not high, the raw materials are not required to be specially processed, the alumina black ceramic radiator with high density and excellent heat dissipation performance can be obtained under a specific forming and processing process, the production cost is greatly reduced, and the problem of serious environmental pollution in the production process in the prior art is also solved.
Description
Technical Field
The invention relates to a ceramic material, in particular to an LED lamp radiator and a preparation method and application thereof.
Background
Compared with other materials, the alumina ceramic has the advantages of high strength, high temperature resistance, good insulativity, corrosion resistance and good electromechanical properties, and can be applied to the fields of electronics, machinery, chemical engineering, metallurgy and the like. Generally speaking, the sintering temperature of 95 alumina ceramics is generally 1600-1700 ℃, and the application is limited due to high investment, high energy consumption, contradiction between price and performance and the like.
Two methods are usually adopted for developing the low-temperature sintered 95 aluminum oxide ceramic, firstly, superfine aluminum oxide powder with good sintering performance is adopted, but the preparation process of the superfine high-purity aluminum oxide powder is complex, the cost is very high, the use price is not equal to 80000-200000 yuan/ton, and the price is often unacceptable for most users; secondly, a proper low-temperature sintering aid is selected, but the cooling effect has certain limitation. For 95 black porcelain, because of adding inorganic colorant, coloring elements volatilize under high temperature sintering, compared with low temperature sintering ceramics, the cost and the process are more difficult and the cost is higher, so that the development of 95 alumina black ceramic radiator with excellent performance and low sintering temperature and capable of effectively inhibiting the volatilization of pigment oxides is necessary for reducing the production cost and lightening the environmental pollution.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a heat sink for LED lamp, a method for preparing the same, and a use thereof, which are used to solve the problems of high production cost and serious environmental pollution during the production process of the prior art while ensuring the performance of alumina ceramic.
To achieve the above objects and other related objects, the present invention includes the following technical solutions.
The invention firstly provides an LED lamp radiator which comprises the following raw material components in parts by weight:
92-95 parts by weight of alumina
0.1 to 5 parts by weight of manganese dioxide
1-8 parts of a sintering aid;
the alumina is industrial grade alumina with the purity not more than 99.00 percent.
Preferably, the alumina is 94 to 95 parts by weight.
Preferably, the manganese dioxide is 0.1 to 3 parts by weight.
Preferably, the sintering aid is 2-6 parts by weight.
The industrial-grade aluminum oxide with the purity of 99.00 percent is adopted in the application, and the price is 3500 yuan/ton; in the prior art, in order to ensure the final performance, nano alumina with higher purity, such as alumina with purity of 99.9% or 99.99%, is used, and the price is 1-20 ten thousand yuan/ton.
According to the LED lamp heat radiator, the sintering aid is selected from SiO2MgO and TiO2One or more of (a). Preferably, the sintering aid is TiO2。
According to the LED lamp heat radiation body, the density of the LED lamp heat radiation body is 3.75-3.95 g/cm3Preferably 3.88 to 3.92g/cm3。
According to the LED lamp heat radiation body, the heat conductivity of the LED lamp heat radiation body is (18-25) W/m.K. Preferably, the heat conductivity of the LED lamp heat radiation body is (18-22) W/m.K.
According to the LED lamp heat radiation body, the electric breakdown strength of the LED lamp heat radiation body is larger than or equal to 10 kV/mm.
The preparation method of the LED lamp heat radiation body comprises the following steps:
1) mixing 92-95 parts by weight of alumina, 0.1-5 parts by weight of manganese dioxide and 1-8 parts by weight of sintering aid, and performing wet ball milling to re-granulate to obtain granulation powder;
2) placing the granulated powder in a mould for pressing and molding to obtain a ceramic blank;
3) sintering the ceramic blank at 1300-1400 ℃, and cooling to obtain the ceramic material.
According to the preparation method, in the step 1), the powder is ball-milled until the particle size of the powder is 2-5 microns.
According to the preparation method, in the step 1), the granulation is performed by adopting a spray granulation process, and the formed granulated powder is 40-250 meshes.
According to the preparation method, in the step 2), the pressure during the compression molding is 50-200 MPa, and the pressure maintaining time is 1-3 s. Preferably, the pressure during the press molding is 100 to 150 MPa.
According to the preparation method, in the step 3), the sintering time is 0.5-2 h. Preferably, the sintering time is 1-2 h. The ceramic piece is easy to distort and deform due to too long sintering time, crystal grains are enlarged, and the overburning phenomenon is generated; if the sintering time is too short, the properties such as the bonding strength of the product may not meet the requirements, and waste products called "under-burning" may be generated.
According to the preparation method, in the step 3), natural cooling can be adopted for cooling.
The invention also discloses the application of the LED lamp heat radiation body in an LED lamp.
The technical scheme of the LED lamp heat radiation body and the preparation method thereof has the beneficial effects that:
according to the LED lamp radiator, the specification of the raw materials in the raw material formula is not high, the raw materials are not required to be specially processed, the alumina black ceramic radiator with high density and excellent heat dissipation performance can be obtained through a specific forming and processing process, the production cost is greatly reduced, and the problem of serious environmental pollution in the production process in the prior art is also solved.
Drawings
FIG. 1 is a structural diagram of a heat sink of an LED lamp according to the present invention
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition to the specific methods, devices, and materials used in the examples, any methods, devices, and materials similar or equivalent to those described in the examples may be used in the practice of the invention in addition to the specific methods, devices, and materials used in the examples, in keeping with the knowledge of one skilled in the art and with the description of the invention.
Example 1
The LED lamp radiator in the embodiment comprises the following raw material components in parts by weight:
95 parts by weight of alumina
Manganese dioxide 0.5 part by weight
TiO24.5 parts by weight;
the alumina is industrial grade alumina with the purity of 99.00 percent.
In this embodiment, the preparation method of the LED lamp heat sink includes the following steps:
1) aluminum oxide is mixed,Manganese dioxide and TiO2Mixing, and performing wet ball milling until the particle size of the powder is 2-5 mu m; granulating by adopting a spray granulation process to obtain granulated powder, wherein the granulated powder is 40-250 meshes;
2) placing the granulated powder in a mould for compression molding, wherein the pressure is 100Mpa, and the pressure maintaining time is 1s, so as to obtain a ceramic blank;
3) and sintering the ceramic blank at 1300 ℃ for 1h, and cooling to obtain the ceramic material.
Comparative example 1
The difference from the embodiment 1 is that the selected radiator raw material is commercially available 95 porcelain alumina granulated powder; the components were 95 parts by weight of alumina, 2.5 parts by weight of silica and 2.5 parts by weight of calcium oxide, and the sintering temperature was 1600 ℃ as in example 1, except for the above.
Comparative example 2
In this comparative example, commercially available 95 porcelain alumina granulated powder was used, and sintering was performed at 1300 ℃ in the same manner as in example 1.
Therefore, the formed product cannot be completely made into porcelain, the strength is low, and the density is low due to the existence of a large number of air holes in the product; in the using process, external moisture permeates into the air holes, so that the performance indexes such as the heat conductivity, the pressure resistance value and the like of the water-based composite material can not meet the using requirements.
Example 2
The LED lamp radiator in the embodiment comprises the following raw material components in parts by weight:
95 parts by weight of alumina
Manganese dioxide 1 part by weight
TiO24 parts by weight;
the alumina is industrial grade alumina with the purity of 99.00 percent.
In this embodiment, the preparation method of the LED lamp heat sink includes the following steps:
1) mixing aluminum oxide, manganese dioxide and TiO2Mixing, performing wet ball milling until the particle size of the powder is 2-5 mu m, and performing spray granulation to obtain granulated powder of 40-250 meshes;
2) placing the granulated powder in a mould for compression molding, wherein the compression pressure is 150MPa, and the pressure maintaining time is 3s, so as to obtain a ceramic blank;
3) and sintering the ceramic blank at 1400 ℃ for 2h, and cooling to obtain the ceramic material.
Example 3
The LED lamp radiator in the embodiment comprises the following raw material components in parts by weight:
94 parts by weight of alumina
Manganese dioxide 0.1 part by weight
TiO25.9 parts by weight;
the alumina is industrial grade alumina with the purity of 99.00 percent.
In this embodiment, the preparation method of the LED lamp heat sink includes the following steps:
1) mixing aluminum oxide, manganese dioxide and TiO2Mixing, performing wet ball milling until the particle size of the powder is 2-5 mu m, and performing granulation to obtain granulated powder of 40-250 meshes;
2) placing the granulated powder in a mould for compression molding, wherein the compression pressure is 120MPa, and the pressure maintaining time is 2s, so as to obtain a ceramic blank;
3) and sintering the ceramic blank at 1350 ℃ for 1h, and cooling to obtain the ceramic material.
Example 4
The LED lamp radiator in the embodiment comprises the following raw material components in parts by weight:
95 parts by weight of alumina
Manganese dioxide 3 parts by weight
TiO22 parts by weight;
the alumina is industrial grade alumina with the purity of 99.00 percent.
In this embodiment, the preparation method of the LED lamp heat sink includes the following steps:
1) mixing aluminum oxide, manganese dioxide and TiO2Mixing, performing wet ball milling until the particle size of the powder is 2-5 mu m, and performing granulation to obtain granulated powder of 40-250 meshes;
2) placing the granulated powder in a mould for compression molding, wherein the compression pressure is 130MPa, and the pressure maintaining time is 1s, so as to obtain a ceramic blank;
3) and sintering the ceramic blank at 1400 ℃ for 1h, and cooling to obtain the ceramic material.
The performance of the heat sinks of the LED lamps in examples 1 to 4 and comparative examples 1 and 2 was tested, and the test method and effect thereof are as follows.
The density test method comprises the following steps: in this experiment, the bulk density of the sample was determined according to the archimedes' principle of drainage. Firstly, placing a fired ceramic sample in boiling water for boiling for 6 hours to open air holes in the ceramic material, then taking out the sample, and respectively weighing the floating weight, the weight loss and the dry weight of the sample. And finally, calculating the density according to a formula listed below:
ρ＝m1*mliquid for treating urinary tract infection/m3-m2(m1Is the dry weight of the sample; m is3Is the saturated wet weight of the ceramic sample; m is2The weight of the sample in the test liquid, mLiquid for treating urinary tract infectionDeionized water with specific gravity of 1g/cm is selected3)
The thermal conductivity test method comprises the following steps: the thermal diffusivity (relaxation resistance, LFA457) of the samples was measured by a laser flash method and averaged 3 times at selected temperature points. The test sample has the specification of phi 12.5mm and the thickness of 2mm, and before the thermal diffusion test is carried out, graphite layers are sprayed on two sides of the test sample so as to improve the absorption of light on a light receiving and receiving surface and inhibit the transmission of backlight surface light. The thermal conductivity K of the sample is determined by the following formula: k ═ α ρ Cp, where α is the thermal diffusion coefficient, ρ is the sample density measured by archimedean drainage method, and Cp is the heat capacity calculated by the Kopp-Neumann rule.
The method for testing the electric breakdown strength comprises the following steps: the breakdown strength of the sample under a direct current electric field is measured by adopting an SD-DC 200KV direct current high voltage generator, and the sample is immersed in silicon oil during testing in order to prevent edge breakdown. Because the electric breakdown strength is related to factors such as test temperature, electrode shape, sample size and the like, in order to ensure that breakdown data has comparability, a controlled variable method is adopted for analysis and test, the diameter of the electrode of all test samples is phi 8mm, the thickness is 0.5mm, at least 10 values of each component are measured, and the breakdown performance of the material is represented by Weber distribution.
The cost comparison method comprises the following steps: mainly compares the raw material cost, the sintering cost and the like.
According to the experimental effect data, the LED lamp radiator formed by the technical scheme in the application can obtain the alumina black ceramic radiator with high density and excellent heat dissipation performance at a lower sintering temperature and in a shorter sintering time.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The LED lamp radiator is characterized by comprising the following raw material components in parts by weight:
92-95 parts by weight of alumina
0.1 to 5 parts by weight of manganese dioxide
1-8 parts of a sintering aid;
the alumina is industrial grade alumina with the purity not more than 99.00 percent.
2. The LED lamp heat sink of claim 1, wherein the sintering aid is selected from SiO2MgO and TiO2One or more of (a).
3. The LED lamp radiator of claim 1, wherein the density of the LED lamp radiator is 3.75-3.95 g/cm3。
4. The LED lamp heat sink as claimed in claim 1, wherein the heat conductivity of the LED lamp heat sink is 18-25W/m-K.
5. The LED lamp heating body of claim 1, wherein the LED lamp heating body has an electrical breakdown strength of 10kV/mm or greater.
6. A preparation method of an LED lamp heat radiation body comprises the following steps:
1) mixing 92-95 parts by weight of alumina, 0.1-5 parts by weight of manganese dioxide and 1-8 parts by weight of sintering aid, and performing wet ball milling to re-granulate to obtain granulation powder;
2) placing the granulated powder in a mould for pressing and molding to obtain a ceramic blank;
3) sintering the ceramic blank at 1300-1400 ℃, and cooling to obtain the ceramic material.
7. The preparation method of claim 6, wherein in the step 1), the powder is ball-milled until the particle size of the powder is 2-5 μm.
8. The preparation method according to claim 6, wherein in the step 1), the granulation is performed by a spray granulation process, and the formed granulated powder is 40-250 meshes.
9. The method according to claim 6, wherein in the step 2), the pressure during the press molding is 50 to 200MPa, and the dwell time is 1 to 3 s;
and/or, in the step 3), the sintering time is 0.5-2 h.
10. Use of the LED lamp heat sink according to any one of claims 1 to 5 in an LED lamp.
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