CN116161686A - Preparation method of high-heat-conductivity alumina powder for communication PKG - Google Patents
Preparation method of high-heat-conductivity alumina powder for communication PKG Download PDFInfo
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- CN116161686A CN116161686A CN202211683353.7A CN202211683353A CN116161686A CN 116161686 A CN116161686 A CN 116161686A CN 202211683353 A CN202211683353 A CN 202211683353A CN 116161686 A CN116161686 A CN 116161686A
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- alumina
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 239000000843 powder Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 238000004891 communication Methods 0.000 title claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000004513 sizing Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000005188 flotation Methods 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000007873 sieving Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000945 filler Substances 0.000 abstract 1
- 102220043159 rs587780996 Human genes 0.000 description 6
- 230000017525 heat dissipation Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012216 screening Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/021—After-treatment of oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/021—After-treatment of oxides or hydroxides
- C01F7/022—Classification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/32—Thermal properties
Abstract
The invention discloses a preparation method of high-heat-conductivity alumina powder for the field of communication PKG. The method comprises the steps of firstly carrying out coarse effect classification and fine classification on d50=0.8-55 mu m spherical alumina to obtain spherical alumina with the large particle content controlled below 50ppm, d50=20-55 mu m spherical alumina, d50=5-20 mu m spherical alumina and d50=0.8-5 mu m spherical alumina, and then mixing d50=20-55 mu m spherical alumina, d50=5-20 mu m spherical alumina, d50=0.8-5 mu m spherical alumina and d50=0.3-2.0 mu m angular alumina to obtain the high-heat-conductivity spherical powder. The invention improves the heat conductivity and the fluidity of the spherical powder by controlling the content of large particles of the filler and by designing the particle size distribution.
Description
Technical Field
The invention belongs to the technical field of alumina material preparation, and particularly relates to a preparation method of high-heat-conductivity alumina powder for communication PKG.
Background
Taking the existing 64T64R S111 macro base station equipment as an example according to the data of the Chinese general service consultation design institute, the power consumption of a single base station is about 3 kW-4 kW, and the power consumption of 5G base station equipment is improved by about 2-3 times compared with that of 4G base station equipment; the electric charge of one 5G standard station (1 BBU+3 AAU) can reach 2 ten thousand yuan in the direct power supply scene, and the electric charge of one station can reach 3 ten thousand yuan in the power conversion scene, which is about 3 times of that of the similar 4G station. High power consumption has therefore become one of the resistances for 5G scale commercial and industry maturation.
With the continuous development of the communication technology industry, 5G has been commercially used in large scale. The amount of heat generated is also quite dramatic, as 5G is more than three times as much as 4G in power. Heat dissipation problems have also been a pain and difficulty of high concern in the consumer electronics industry. As is well known, when the photoelectric chip works, the injection current is not converted into output photoelectrons by 100%, a part of the photoelectrons are used as energy loss in a heat mode, if a large amount of heat is accumulated continuously and cannot be removed in time, a plurality of adverse effects on the performance of the component can be generated, in general, the temperature rise resistance value is reduced, the service life of the component is reduced, the performance is deteriorated, the material is aged, and the component is damaged; in addition, high temperature can generate stress deformation to the material, reliability is reduced, and the device is abnormal.
Therefore, the research on the high-heat-conductivity alumina powder suitable for the PKG field is introduced into the chip package, and the important significance is achieved in improving the heat dissipation performance of the chip.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a preparation method of high-heat-conductivity alumina powder for the field of communication PKG.
The technical scheme for realizing the purpose of the invention is as follows:
the invention relates to a preparation method of high-heat-conductivity alumina powder for the field of communication PKG, which is characterized by comprising the following steps:
(1) Coarse-sizing the spherical alumina with d50=0.8-55 μm to obtain spherical alumina powder with the large particle content controlled below 1000ppm and d50=0.8-55 μm, and fine-sizing to obtain spherical alumina with the large particle content controlled below 50ppm and the particle sizes respectively d50=20-55 μm, d50=5-20 μm and d50=0.8-5 μm; large particles refer to particles having a particle size greater than 75 μm the maximum particle size of the product design;
(2) Taking spherical alumina with d50=20-55 mu m, spherical alumina with d50=5-20 mu m and spherical alumina with d50=0.8-5 mu m, and mixing according to the mass ratio of 1:0.01-0.3 to obtain the high heat conduction alumina powder.
In the preparation method, in the step (2), angular alumina with D50=0.3-2.0 μm, spherical alumina with D50=20-55 μm, spherical alumina with D50=5-20 μm, spherical alumina with D50=0.8-5 μm and angular alumina with D50=0.3-2.0 μm are added in the mass ratio of 1:0.01-0.3:0.01-0.1.
According to the preparation method, in the step (1), the spherical alumina with d50=0.8-55 μm is prepared by a flame balling method.
In the preparation method, in the step (1), the classifying processing mode is screening, air classifying or floatation, and the classifying equipment is a screening machine, an air classifying machine or floatation equipment.
In the step (2), the spherical alumina with d50=20-55 μm, the spherical alumina with d50=5-20 μm, the spherical alumina with d50=0.8-5 μm and the angular alumina with d50=0.3-2.0 μm are mixed according to the mass ratio of 1:0.1-0.5:0.05-0.2:0.03-0.06 to obtain the alumina powder with high heat conductivity.
In the preparation method, in the step (2), the mass ratio of the spherical alumina with d50=20-55 μm to the spherical alumina with d50=5-20 μm is 1:0.15-0.40.
In the preparation method, in the step (2), the mass ratio of the spherical alumina with d50=20-55 μm to the spherical alumina with d50=0.8-5 μm is 1:0.05-0.15.
According to the preparation method, in the step (2), the mass ratio of the spherical alumina with D50=20-55 μm to the angular alumina is 1:0.05.
The preparation method is further preferably characterized in that in the step (2), the mixing method is that high-speed mixing is carried out in an airflow type mixer, the pressure of compressed air is 1.5Mpa, the mixing time is 30min, and the loading coefficient is 0.35.
In the preparation method, in the step (2), the mixing equipment is selected from a two-dimensional mixer, a three-dimensional mixer, a V-shaped mixer, a double-cone mixer, a gravity-free mixer, a cone mixer or a coulter mixer.
Compared with the prior art, the invention has the following beneficial effects:
the method of the invention improves the heat conductivity and fluidity of the spherical powder by designing the preferred particle size distribution. The heat dissipation material is introduced into the chip package, so that the heat dissipation performance of the chip can be effectively improved.
Detailed Description
The following further illustrates the technical solution of the present invention so that those skilled in the art may further understand the present invention without restricting the right of the present invention.
Example 1, preparation method of high thermal conductivity alumina powder for communication PKG field:
the large particle content is controlled below 50ppm, and the spherical alumina with d50=40 μm, the spherical alumina with d50=9 μm and the spherical alumina with d50=2.5 μm are mixed for 30min according to the mass ratio of 1:0.20:0.05 in an airflow mixer. A mixed alumina powder having a thermal conductivity of 2.73/(mK) and a flow length of 123cm was obtained.
Example 2 a method for preparing highly thermally conductive alumina powder for use in the field of communication PKG,
the large particle content is controlled below 50ppm, and the spherical alumina with d50=40 μm, the spherical alumina with d50=9 μm and the spherical alumina with d50=2.5 μm are mixed for 30min according to the mass ratio of 1:0.25:0.05 in an airflow mixer. The mixed alumina powder with a thermal conductivity of 2.76W/(mK) or more and a flow length of 128cm was obtained.
Example 3 preparation method of high thermal conductivity alumina powder for use in the communication PKG field:
the large particle content is controlled below 50ppm, and the spherical alumina with d50=40 μm, the spherical alumina with d50=9 μm and the spherical alumina with d50=2.5 μm are mixed for 30min according to the mass ratio of 1:0.30:0.05 in an airflow mixer. A mixed alumina powder having a thermal conductivity of 2.71W/(mK) and a flow length of 117cm was obtained.
Example 4 preparation method of high thermal conductivity alumina powder for use in the communication PKG field:
the large particle content is controlled below 50ppm, and the spherical alumina with d50=40 μm, the spherical alumina with d50=9 μm and the spherical alumina with d50=2.5 μm are mixed for 30min according to the mass ratio of 1:0.25:0.10 in an airflow mixer. A mixed alumina powder having a thermal conductivity of 2.75W/(mK) and a flow length of 145cm was obtained.
Example 5 preparation of highly thermally conductive alumina powder for use in the communication PKG field:
the large particle content is controlled below 50ppm, and the spherical alumina with d50=40 μm, the spherical alumina with d50=9 μm and the spherical alumina with d50=2.5 μm are mixed for 30min according to the mass ratio of 1:0.25:0.15 in an airflow mixer. The mixed alumina powder having a thermal conductivity of 2.68W/(mK) or more and a flow length of 131cm was obtained.
Example 6 preparation of highly thermally conductive alumina powder for use in the communication PKG field:
the large particle content was controlled to 50ppm or less, and d50=40 μm spherical alumina was mixed with d50=9 μm spherical alumina, d50=2.5 μm spherical alumina, and d50.9 μm angular alumina in a mass ratio of 1:0.25:0.10:0.09 in a jet mixer for 30 minutes. The mixed alumina powder with the heat conductivity of more than 2.98W/(m.K) and the flow length of 114cm is obtained.
Example 7 preparation method of high thermal conductivity alumina powder for use in the communication PKG field:
the large particle content was controlled to 50ppm or less, and d50=40 μm spherical alumina was mixed with d50=9 μm spherical alumina, d50=2.5 μm spherical alumina, and d50.9 μm angular alumina in a mass ratio of 1:0.25:0.10:0.06 in a jet mixer for 30 minutes. A mixed alumina powder having a thermal conductivity of 2.94W/(mK) or more and a flow length of 129cm was obtained.
Example 8 preparation of highly thermally conductive alumina powder for use in the communication PKG field:
the large particle content was controlled to 50ppm or less, and d50=40 μm spherical alumina was mixed with d50=9 μm spherical alumina, d50=2.5 μm spherical alumina, and d50.9 μm angular alumina in a mass ratio of 1:0.25:0.10:0.03 in a jet mixer for 30 minutes. A mixed alumina powder having a thermal conductivity of 2.88W/(mK) and a flow length of 138cm was obtained.
Example 9 preparation method of high thermal conductivity alumina powder for use in the communication PKG field:
the large particle content was controlled to 50ppm or less, and d50=40 μm spherical alumina was mixed with d50=9 μm spherical alumina, d50=2.5 μm spherical alumina, d50.0 μm spherical alumina, and d50.9 μm angular alumina in a mass ratio of 1:0.25:0.10:0.03:0.03 in a jet mixer for 30 minutes. A mixed alumina powder having a thermal conductivity of 2.95W/(mK) and a flow length of 149cm was obtained.
From the results of example 6, the product fluidity was remarkably deteriorated and the thermal conductivity was improved by adding angular alumina, and from the results of example 9, the product had both good thermal conductivity and excellent fluidity by adding spherical alumina having a D50 of 1.0. Mu.m. Therefore, specific raw material proportions can be selected for mixing according to the requirements of heat conductivity and fluidity to prepare the alumina powder with high heat conductivity.
Claims (10)
1. The preparation method of the high-heat-conductivity alumina powder for the communication PKG field is characterized by comprising the following steps of:
(1) Coarse-sizing the spherical alumina with d50=0.8-55 μm to obtain spherical alumina powder with the large particle content controlled below 1000ppm and d50=0.8-55 μm, and fine-sizing to obtain spherical alumina with the large particle content controlled below 50ppm and the particle sizes respectively d50=20-55 μm, d50=5-20 μm and d50=0.8-5 μm; large particles refer to particles having a particle size greater than 75 μm the maximum particle size of the product design;
(2) Taking spherical alumina with d50=20-55 mu m, spherical alumina with d50=5-20 mu m and spherical alumina with d50=0.8-5 mu m, and mixing according to the mass ratio of 1:0.01-0.3 to obtain the high heat conduction alumina powder.
2. The method according to claim 1, wherein in the step (2), angular alumina of d50=0.3 to 2.0 μm, spherical alumina of d50=20 to 55 μm, spherical alumina of d50=5 to 20 μm, spherical alumina of d50=0.8 to 5 μm and angular alumina of d50=0.3 to 2.0 μm are further added at the time of mixing in a mass ratio of 1:0.01 to 0.3:0.01 to 0.1.
3. The method according to claim 1 or 2, wherein in the step (1), the spherical alumina having d50=0.8 to 55 μm is prepared by flame-balling.
4. The method of claim 1 or 2, wherein in step (1), classification is performed by sieving, air classification or flotation, and classification equipment is used by sieving, air classification or flotation equipment.
5. The preparation method according to claim 2, wherein in the step (2), the spherical alumina with d50=20 to 55 μm, the spherical alumina with d50=5 to 20 μm, the spherical alumina with d50=0.8 to 5 μm and the angular alumina with d50=0.3 to 2.0 μm are mixed according to a mass ratio of 1:0.1 to 0.5:0.05 to 0.2:0.03 to 0.06, so as to obtain the alumina powder with high heat conductivity.
6. The production method according to claim 1 or 2, wherein in the step (2), the mass ratio of d50=20 to 55 μm of spherical alumina to d50=5 to 20 μm of spherical alumina is 1:0.15 to 0.40.
7. The production method according to claim 1 or 2, wherein in the step (2), the mass ratio of d50=20 to 55 μm of spherical alumina to d50=0.8 to 5 μm of spherical alumina is 1:0.05 to 0.15.
8. The method according to claim 2, wherein in the step (2), d50=20 to 55 μm of spherical alumina to angular alumina is in a mass ratio of 1:0.05.
9. The method according to claim 1 or 2, wherein in the step (2), the mixing is performed at a high speed in an air flow mixer, the compressed air pressure is 1.5Mpa, the mixing time is 30min, and the loading factor is 0.35.
10. The method according to claim 1 or 2, wherein in the step (2), the mixing device is selected from a two-dimensional mixer, a three-dimensional mixer, a V-type mixer, a double cone mixer, a gravity-free mixer, a cone mixer, and a coulter mixer.
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Citations (5)
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|---|---|---|---|---|
| WO2003055803A2 (en) * | 2001-12-27 | 2003-07-10 | Showa Denko K.K. | Particulate alumina, method for producing particulate alumina and composition containing particulate alumina |
| CN111348668A (en) * | 2020-03-16 | 2020-06-30 | 中国铝业股份有限公司 | Preparation method of aluminum oxide for heat-conducting filler |
| CN112607756A (en) * | 2020-11-25 | 2021-04-06 | 江苏联瑞新材料股份有限公司 | Preparation method of spherical alumina for epoxy molding and packaging material |
| CN113184886A (en) * | 2021-04-14 | 2021-07-30 | 雅安百图高新材料股份有限公司 | Preparation method and product of high-thermal-conductivity spherical alumina |
| CN113735149A (en) * | 2021-09-17 | 2021-12-03 | 江苏联瑞新材料股份有限公司 | Preparation method of spherical alumina powder for high-thermal-conductivity underfill |
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2022
- 2022-12-27 CN CN202211683353.7A patent/CN116161686A/en active Pending
Patent Citations (5)
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| WO2003055803A2 (en) * | 2001-12-27 | 2003-07-10 | Showa Denko K.K. | Particulate alumina, method for producing particulate alumina and composition containing particulate alumina |
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| CN113184886A (en) * | 2021-04-14 | 2021-07-30 | 雅安百图高新材料股份有限公司 | Preparation method and product of high-thermal-conductivity spherical alumina |
| CN113735149A (en) * | 2021-09-17 | 2021-12-03 | 江苏联瑞新材料股份有限公司 | Preparation method of spherical alumina powder for high-thermal-conductivity underfill |
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