CN116874304B - Ceramic material with high heat dissipation performance and preparation method and application thereof - Google Patents
Ceramic material with high heat dissipation performance and preparation method and application thereof Download PDFInfo
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- CN116874304B CN116874304B CN202310782658.1A CN202310782658A CN116874304B CN 116874304 B CN116874304 B CN 116874304B CN 202310782658 A CN202310782658 A CN 202310782658A CN 116874304 B CN116874304 B CN 116874304B
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- 229910010293 ceramic material Inorganic materials 0.000 title claims abstract description 50
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 36
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims abstract description 34
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 25
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 25
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 19
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 19
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 18
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910001928 zirconium oxide Inorganic materials 0.000 claims abstract description 15
- 239000000314 lubricant Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 41
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- 238000000498 ball milling Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000005245 sintering Methods 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000000137 annealing Methods 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 13
- 238000010248 power generation Methods 0.000 claims description 11
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 9
- 239000012298 atmosphere Substances 0.000 claims description 7
- 239000002612 dispersion medium Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 10
- 239000002245 particle Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical class [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007656 fracture toughness test Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- VASIZKWUTCETSD-UHFFFAOYSA-N oxomanganese Chemical compound [Mn]=O VASIZKWUTCETSD-UHFFFAOYSA-N 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229910020068 MgAl Inorganic materials 0.000 description 1
- 101100371219 Pseudomonas putida (strain DOT-T1E) ttgE gene Proteins 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 1
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002114 nanocomposite Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 229920013636 polyphenyl ether polymer Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910003468 tantalcarbide Inorganic materials 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 229910021341 titanium silicide Inorganic materials 0.000 description 1
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- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/581—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on aluminium nitride
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
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Abstract
The invention belongs to the technical field of high-heat-dissipation ceramic materials, and particularly relates to a high-heat-dissipation ceramic material, a preparation method and application thereof. The high-heat-dissipation ceramic material is composed of the following raw materials in parts by weight: silicon nitride: 20-30 parts of a lubricant; aluminum nitride: 30-35 parts of a lubricant; nano magnesium oxide: 1-3 parts; titanium dioxide: 5-8 parts of a lubricant; zirconia: 10-15 parts of a lubricant; yttria: 1-3 parts. The invention ensures high thermal conductivity and heat dissipation property through co-doping of silicon nitride, aluminum nitride and zirconium oxide, and simultaneously ensures that the ceramic material also has higher fracture toughness and strength, thereby greatly improving the performance of the ceramic material.
Description
Technical Field
The invention belongs to the technical field of high-heat-dissipation ceramic materials, and particularly relates to a high-heat-dissipation ceramic material, a preparation method and application thereof.
Background
In the process of using the solar panel, the power generation efficiency of the panel is greatly affected by the temperature of the panel. In general, the output voltage of a solar cell panel decreases with an increase in temperature, and the output current increases with an increase in temperature, so that the overall power generation efficiency is affected by the temperature. When the temperature of the solar panel exceeds a certain range, the phenomenon of temperature runaway can occur, so that the efficiency of the solar panel is reduced, and the normal operation of a solar system is affected. When the temperature rises above 30 ℃, the power generation efficiency of the solar panel may start to decrease rapidly. In most areas of China, the temperature in noon in summer exceeds 30 ℃, which leads to the most sufficient time period of sunlight, the power generation efficiency of the solar cell panel is greatly reduced, and the utilization efficiency of solar energy is seriously influenced.
Patent application CN107434414a, publication time 2017.12.05. Discloses a high-heat-dissipation ceramic heat-dissipation nanocomposite for an LED lamp, which is prepared from bentonite, magnesium oxide, calcium carbonate and MgAl 2 O 4 SSZ-13 nano material, polymerized modified phenolic resin, silicon dioxide, boron nitride, hydroxymethyl cellulose and methyl acrylate are taken as main raw materials, mgAl is adopted 2 O 4 Coupling treatment of SSZ-13 nanometer molecular sieve, and then organic modification of polyphenyl ether phenolic resin, mgAl is adopted 2 O 4 And the heat dissipation particles are formed by the heat dissipation particles and the SSZ-13 nano molecular sieve material, so that the heat dissipation particles have high heat dissipation performance and high heat conductivity in the radial direction and the axial direction, and the ceramic heat dissipation material with excellent performance is prepared. However, the preparation method is complex and is not suitable for industrial production.
Patent application CN106986662a, publication time 2017.07.28. The invention discloses a solar heat absorption ceramic material and a preparation method thereof, wherein the solar heat absorption ceramic material comprises the following components in parts by weight: 15-40 parts of silicon nitride, 15-40 parts of boron nitride, 5-15 parts of titanium silicide, 5-15 parts of tantalum carbide, 5-12 parts of chromium oxide, 5-12 parts of aluminum oxide, 2-7 parts of sodium silicate, 2-5 parts of boron oxide and 2-3 parts of manganese monoxide. But has lower bending strength and is not suitable for a solar power generation heat dissipation ceramic substrate.
In summary, the prior art can provide a preparation method of a heat dissipation ceramic material, but the preparation method is complex, has lower bending strength and is not suitable for a solar power generation heat dissipation ceramic plate.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the ceramic material with high heat dissipation performance, high bending strength, good heat conduction performance, high heat dissipation rate, large volume resistivity and good insulativity.
The invention also aims to provide a preparation method of the ceramic material with high heat dissipation, which is simple and is beneficial to industrial production.
Another object of the present invention is to provide a use of a ceramic material with high heat dissipation.
The technical scheme adopted by the invention is as follows:
the high-heat-dissipation ceramic material is composed of the following raw materials in parts by weight: silicon nitride: 20-30 parts of a lubricant; aluminum nitride: 30-35 parts of a lubricant; nano magnesium oxide: 1-3 parts; titanium dioxide: 5-8 parts of a lubricant; zirconia: 10-15 parts of a lubricant; yttria: 1-3 parts.
The aluminum nitride is micron aluminum nitride with the grain diameter of 3-8 μm.
The preparation method of the high-heat-dissipation ceramic material comprises the following steps:
(1) Silicon nitride, aluminum nitride and zirconium oxide are subjected to ultrasonic dispersion on an ultrasonic cleaner for 2-3 hours by taking absolute ethyl alcohol as a dispersion medium, so as to obtain a pretreatment mixture I;
(2) Stirring and mixing nano magnesium oxide, titanium dioxide and yttrium oxide with the pretreated mixture I obtained in the step (1), putting the mixture into a ball mill, performing ball milling, putting the ball mill into a drying oven for drying after ball milling, and removing absolute ethyl alcohol to obtain a pretreated mixture II;
(3) Carrying out dry pressing molding on the pretreated mixture II obtained in the step (2) to obtain a green body;
(4) Sintering the green body obtained in the step (3), heating the green body to 350-600 ℃ at the speed of 20-50 ℃/h under the atmosphere of nitrogen, then preserving heat for 2-3h, heating to 1350-1500 ℃ at the speed of 80-95 ℃/h, and then annealing after preserving heat for 1-3h, thus obtaining the ceramic material with high heat dissipation.
In the step (1), the mass ratio of the total mass of silicon nitride, aluminum nitride and zirconium oxide to the absolute ethyl alcohol is 1: (25-30).
The ball milling time in the step (2) is 10-13h.
The dry pressing forming pressure in the step (3) is 15-25MPa.
The annealing speed is 20-35 ℃/h.
The application of the high-heat-dissipation ceramic material is used for the solar power generation heat-dissipation ceramic substrate.
When the solar power generation and heat dissipation ceramic substrate is used, the ceramic substrate is arranged below the solar cell panel and is not directly irradiated by sunlight, and the ceramic substrate can be in different shapes, preferably hollow or porous according to actual conditions, so that the contact area with air is increased. The ceramic substrate is attached to the battery plate, and has high insulativity, so that the heat dissipation of the battery plate can be quickened, the strength of the battery plate can be enhanced, the use of a battery plate supporting material is reduced, and the heat conduction efficiency is quickened.
According to the invention, through the synergistic effect of the silicon nitride and the aluminum nitride, the material has higher fracture toughness while ensuring the heat conductivity, and the bonding degree of each component during sintering is greatly improved through the addition of the nano magnesium oxide, and the yttrium oxide is used as a sintering aid; the particle size of each component is smaller and the dispersion is more uniform through the ultrasonic treatment of the silicon nitride, the aluminum nitride and the zirconium oxide in the earlier stage, the nano magnesium oxide, the titanium dioxide and the yttrium oxide are fully permeated among the silicon nitride, the aluminum nitride and the zirconium oxide matrix materials through ball milling, the aim of premixing is achieved, a foundation is provided for the interaction of each component during sintering, the crystal form of the ceramic material after the sintering is not changed any more through the control of the annealing speed, and the stability of the product is improved.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention ensures the heat dissipation property and simultaneously ensures the ceramic material to have higher fracture toughness and strength through the co-doping of the silicon nitride, the aluminum nitride and the zirconia, thereby greatly improving the performance of the ceramic material;
(2) According to the invention, through different pretreatment modes of different raw materials, the mixing uniformity of each component before sintering is greatly improved, and the synergistic effect of each component and the formation of a crystal form during high-temperature sintering are facilitated;
(3) The invention is applied to the solar cell power generation heat dissipation ceramic substrate, and greatly improves the heat dissipation efficiency of the solar cell panel.
Detailed Description
The invention is further illustrated below with reference to examples, which are not intended to limit the practice of the invention.
The testing method comprises the following steps:
the bending strength testing method comprises the following steps: GB/T4741-1999 method for testing flexural Strength of ceramic Material;
fracture toughness test method: GB/T23806-2009 Single-sided Pre-crack Beam (SEPB) method for Fine ceramic fracture toughness test method;
thermal conductivity: GB/T22588-2208 "flash method for measuring thermal diffusivity or thermal conductivity";
volume resistivity: GB/T1410-2006 experimental method for volume resistivity and surface resistivity of solid insulating materials.
Example 1
The ceramic material with high heat dissipation performance is prepared from the following raw materials: silicon nitride: 25 g; aluminum nitride: 33 grams; nano magnesium oxide: 2 g; titanium dioxide: 6 g; zirconia: 13 g; yttria: 2 g;
wherein the aluminum nitride particle size is 7 μm.
The preparation method comprises the following steps:
(1) Taking anhydrous ethanol as a dispersion medium, wherein the dosage of the anhydrous ethanol is 1988 g, and performing ultrasonic dispersion on the silicon nitride, the aluminum nitride and the zirconium oxide for 3 hours on an ultrasonic cleaner to obtain a pretreatment mixture I;
(2) Stirring and mixing nano magnesium oxide, titanium dioxide and yttrium oxide with the pretreated mixture I obtained in the step (1), putting the mixture into a ball mill, ball milling for 12 hours, putting the mixture into a drying oven for drying after ball milling, and removing absolute ethyl alcohol to obtain a pretreated mixture II;
(3) Carrying out dry press molding on the pretreated mixture II obtained in the step (2) to obtain a green body, wherein the dry press molding pressure is 20MPa;
(4) Sintering the green body obtained in the step (3), heating the green body to 500 ℃ at a speed of 35 ℃/h under the atmosphere of nitrogen, then preserving heat for 2h, heating to 1450 ℃ at a speed of 88 ℃/h, preserving heat for 2h, and then annealing at a speed of 30 ℃/h, thus obtaining the ceramic material with high heat dissipation.
The high heat dissipation ceramic materials were tested and the test results are shown in table 1.
Example 2
The ceramic material with high heat dissipation performance is prepared from the following raw materials: silicon nitride: 20 g; aluminum nitride: 30 g; nano magnesium oxide: 3 g; titanium dioxide: 5 g; zirconia: 10 g; yttria: 1 gram;
wherein the aluminum nitride particle size is 3 μm.
The preparation method comprises the following steps:
(1) Taking anhydrous ethanol as a dispersion medium, wherein the dosage of the anhydrous ethanol is 1500 g, and performing ultrasonic dispersion on the silicon nitride, the aluminum nitride and the zirconium oxide for 2 hours on an ultrasonic cleaner to obtain a pretreated mixture I;
(2) Stirring and mixing nano magnesium oxide, titanium dioxide and yttrium oxide with the pretreated mixture I obtained in the step (1), putting the mixture into a ball mill, ball milling for 10 hours, putting the mixture into a drying oven for drying after ball milling, and removing absolute ethyl alcohol to obtain a pretreated mixture II;
(3) Carrying out dry press molding on the pretreated mixture II obtained in the step (2) to obtain a green body, wherein the dry press molding pressure is 15MPa;
(4) Sintering the green body obtained in the step (3), heating the green body to 350 ℃ at a speed of 20 ℃/h under the atmosphere of nitrogen, then preserving heat for 2 hours, heating to 1350 ℃ at a speed of 80 ℃/h, preserving heat for 1 hour, and then annealing at a speed of 20 ℃/h, thus obtaining the ceramic material with high heat dissipation.
The high heat dissipation ceramic materials were tested and the test results are shown in table 1.
Example 3
The ceramic material with high heat dissipation performance is prepared from the following raw materials: silicon nitride: 30 g; aluminum nitride: 35 g; nano magnesium oxide: 1 gram; titanium dioxide: 8 g; zirconia: 15 g; yttria: 3 g;
wherein the aluminum nitride particle size is 8 μm.
The preparation method comprises the following steps:
(1) Taking anhydrous ethanol as a dispersion medium, wherein the dosage of the anhydrous ethanol is 2400 g, and performing ultrasonic dispersion on the silicon nitride, the aluminum nitride and the zirconium oxide for 3 hours on an ultrasonic cleaner to obtain a pretreated mixture I;
(2) Stirring and mixing nano magnesium oxide, titanium dioxide and yttrium oxide with the pretreated mixture I obtained in the step (1), putting the mixture into a ball mill, ball milling for 13 hours, putting the mixture into a drying oven for drying after ball milling, and removing absolute ethyl alcohol to obtain a pretreated mixture II;
(3) Carrying out dry press molding on the pretreated mixture II obtained in the step (2) to obtain a green body, wherein the dry press molding pressure is 25MPa;
(4) Sintering the green body obtained in the step (3), heating the green body to 600 ℃ at a speed of 35 ℃/h under the atmosphere of nitrogen, then preserving heat for 3 hours, heating to 1500 ℃ at a speed of 95 ℃/h, preserving heat for 3 hours, and then annealing at a speed of 35 ℃/h, thus obtaining the ceramic material with high heat dissipation.
The high heat dissipation ceramic materials were tested and the test results are shown in table 1.
Comparative example 1
The ceramic material consists of the following raw materials: silicon nitride: 25 g; aluminum nitride: 33 grams; nano magnesium oxide: 2 g; titanium dioxide: 6 g; zirconia: 13 g; yttria: 2 g.
The preparation method comprises the following steps:
(1) Mixing silicon nitride, aluminum nitride, zirconium oxide, nano magnesium oxide, titanium dioxide and yttrium oxide for 2h;
(2) Carrying out dry press molding on the pretreated mixture II obtained in the step (1) to obtain a green body, wherein the dry press molding pressure is 20MPa;
(3) Sintering the green body obtained in the step (2), heating the green body to 500 ℃ at a speed of 35 ℃/h in a nitrogen atmosphere, then preserving heat for 2h, heating to 1450 ℃ at a speed of 88 ℃/h, and annealing after 2h of heat preservation, wherein the annealing speed is 30 ℃/h, and obtaining the ceramic material after the annealing is completed.
The ceramic materials were tested and the test results are shown in table 1.
Comparative example 2
The ceramic material consists of the following raw materials: silicon nitride: 20 g; aluminum nitride: 30 g; titanium dioxide: 5 g; zirconia: 10 g.
The preparation method comprises the following steps:
(1) Taking anhydrous ethanol as a dispersion medium, wherein the dosage of the anhydrous ethanol is 1500 g, and performing ultrasonic dispersion on the silicon nitride, the aluminum nitride and the zirconium oxide for 2 hours on an ultrasonic cleaner to obtain a pretreated mixture I;
(2) Stirring and mixing titanium dioxide and the pretreated mixture I obtained in the step (1), putting the mixture into a ball mill, ball milling for 10 hours, putting the mixture into a drying oven for drying after ball milling, and removing absolute ethyl alcohol to obtain a pretreated mixture II;
(3) Carrying out dry press molding on the pretreated mixture II obtained in the step (2) to obtain a green body, wherein the dry press molding pressure is 15MPa;
(4) Sintering the green body obtained in the step (3), heating the green body to 350 ℃ at a speed of 20 ℃/h under the atmosphere of nitrogen, then preserving heat for 2 hours, heating to 1350 ℃ at a speed of 80 ℃/h, preserving heat for 1 hour, and then annealing at a speed of 20 ℃/h, wherein the ceramic material is obtained after the annealing is completed.
The ceramic materials were tested and the test results are shown in table 1.
Comparative example 3
The ceramic material with high heat dissipation performance is prepared from the following raw materials: aluminum nitride: 35 g; nano magnesium oxide: 1 gram; titanium dioxide: 8 g; zirconia: 15 g; yttria: 3 g;
wherein the aluminum nitride particle size is 8 μm.
The preparation method comprises the following steps:
(1) Taking aluminum nitride and zirconium oxide as dispersion media, wherein the dosage of the absolute ethyl alcohol is 1500 g, and performing ultrasonic dispersion on the aluminum nitride and zirconium oxide for 3 hours on an ultrasonic cleaner to obtain a pretreated mixture I;
(2) Stirring and mixing nano magnesium oxide, titanium dioxide and yttrium oxide with the pretreated mixture I obtained in the step (1), putting the mixture into a ball mill, ball milling for 13 hours, putting the mixture into a drying oven for drying after ball milling, and removing absolute ethyl alcohol to obtain a pretreated mixture II;
(3) Carrying out dry press molding on the pretreated mixture II obtained in the step (2) to obtain a green body, wherein the dry press molding pressure is 25MPa;
(4) Sintering the green body obtained in the step (3), heating the green body to 600 ℃ at a speed of 35 ℃/h under the atmosphere of nitrogen, then preserving heat for 3 hours, heating to 1500 ℃ at a speed of 95 ℃/h, preserving heat for 3 hours, and then annealing to obtain the ceramic material.
The ceramic materials were tested and the test results are shown in table 1.
Table 1 test results for each of the examples and comparative examples
。
As can be seen from the comparison of example 1 and comparative example 1, the pretreatment conditions before sintering are important; as is clear from the comparison of example 2 and comparative example 2, nano magnesium oxide and yttrium oxide have a large influence on the bonding degree of each component during sintering; as is clear from the comparison between example 3 and comparative example 3, the effect of silicon nitride on the coordination of the entire ceramic material is great, and at the same time, the effect of the annealing speed on the temperature of the crystal form is great. The ceramic material has higher fracture toughness and strength by co-doping of silicon nitride, aluminum nitride and zirconium oxide, and can be applied to a solar power generation heat dissipation ceramic substrate.
Claims (5)
1. The ceramic material with high heat dissipation performance is characterized by comprising the following raw materials in parts by weight: silicon nitride: 20-30 parts of a lubricant; aluminum nitride: 30-35 parts of a lubricant; nano magnesium oxide: 1-3 parts; titanium dioxide: 5-8 parts of a lubricant; zirconia: 10-15 parts of a lubricant; yttria: 1-3 parts;
the aluminum nitride is micron aluminum nitride with the grain diameter of 3-8 mu m;
the preparation method of the ceramic material with high heat dissipation comprises the following steps:
(1) Silicon nitride, aluminum nitride and zirconium oxide are subjected to ultrasonic dispersion on an ultrasonic cleaner for 2-3 hours by taking absolute ethyl alcohol as a dispersion medium, so as to obtain a pretreatment mixture I;
(2) Stirring and mixing nano magnesium oxide, titanium dioxide and yttrium oxide with the pretreated mixture I obtained in the step (1), putting the mixture into a ball mill, performing ball milling, putting the ball mill into a drying oven for drying after ball milling, and removing absolute ethyl alcohol to obtain a pretreated mixture II;
(3) Carrying out dry pressing molding on the pretreated mixture II obtained in the step (2) to obtain a green body;
(4) Sintering the green body obtained in the step (3), heating the green body to 350-600 ℃ at the speed of 20-35 ℃/h under the atmosphere of nitrogen, then preserving heat for 2-3h, heating to 1350-1500 ℃ at the speed of 80-95 ℃/h, and then annealing after preserving heat for 1-3h, thus obtaining the ceramic material with high heat dissipation.
2. The ceramic material with high heat dissipation according to claim 1, wherein the mass ratio of the total mass of silicon nitride, aluminum nitride and zirconium oxide to the absolute ethanol in the step (1) is 1 (25-30).
3. The ceramic material with high heat dissipation according to claim 1, wherein the ball milling time in the step (2) is 10-13h.
4. The ceramic material with high heat dissipation according to claim 1, wherein the dry press molding pressure in the step (3) is 15-25MPa.
5. Use of a high heat dissipation ceramic material according to claim 1 for a solar power generation heat dissipation ceramic substrate.
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