CN109095482A - A kind of spherical shape magnesia and its manufacturing method - Google Patents
A kind of spherical shape magnesia and its manufacturing method Download PDFInfo
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- CN109095482A CN109095482A CN201810907532.1A CN201810907532A CN109095482A CN 109095482 A CN109095482 A CN 109095482A CN 201810907532 A CN201810907532 A CN 201810907532A CN 109095482 A CN109095482 A CN 109095482A
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- magnesia
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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
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
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- 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
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- 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
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- 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
- C01P2006/10—Solid density
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- 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
- C01P2006/80—Compositional purity
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- 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
- C01P2006/80—Compositional purity
- C01P2006/82—Compositional purity water content
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention provides a kind of spherical magnesia, spherical shape magnesia magnesia purity content >=85%, and 2-150 μm of average grain diameter, sphericity >=0.86, water content≤8%wt, density 3.0-3.8g/cm3；A kind of preparation method of spherical magnesia is also provided, including providing purity 89%-99%, 5-90 μm of partial size, moisture content≤3%wt magnesium oxide powder；Magnesium oxide powder is melted to form spherical droplets shape melt by Verneuil method, combustion-supporting gas selects oxygen and natural gas, forms thermal-flame；Cooling and shaping forms spherical magnesia；Spherical magnesia is classified.The beneficial effects of the present invention are: the spherical shape magnesia has specifically at being grouped as the equal partial size of peace, good sphericity, have preferable mobility, excellent heating conduction the features such as, it is excellent using the electronics Heat Conduction Material manufactured goods heat dissipation performance, long service life, cost performance is high, high thermal conductivity coefficient, and monocrystalline thermal conductivity is higher than magnesia.
Description
Technical field
The invention belongs in technical field of preparation for inorganic material, more particularly, to a kind of spherical magnesia and its manufacturer
Method.
Background technique
The Heat Conduction Material being widely used in the thermally conductive field of electronics has metal, metal oxide, nitride, carbon material
Deng.With metal phase ratio, although oxide thermal conductivity is not high, price is very cheap, and being largely filled into smelting in polymer can
To reach ideal heat-conducting effect.The industry of heat-conducting plastic application is more and more, and market is for excellent mechanical property and height
The demand of Heat Conduction Material is also increasing.Therefore, novel heat-conducting filler is developed, explores variety classes filler to improvement composite material
Heating conduction and application field should be highly valued, and should be solved in time, to meet modern science and technology and national development
Needs.
Since angular magnesia powder has irregular grain shape, lack mobility, filling rate is low, and fillibility is poor, more
It uses in the thermally conductive product of low-end electronic.Boron nitride and aluminium nitride are because of its production technology complexity, and price is high, the hexagonal crystal tying of product
Structure limitation causes heating conduction unstable, doses use on a small quantity in the thermally conductive product of electronics at present.The prior art is with magnesium sulfate
And ammonium hydroxide is raw material, prepares bouquet magnesium hydroxide presoma through static reaction, it is spherical then after sodium hydroxide solution is handled
Particle surface becomes smooth, obtains the higher spherical magnesium oxide product of purity, then product spherical shape magnesia is obtained after calcining.But
It is that the spherical mgo surface finish that this method obtains is poor, the limitation of particle size is very big, to electronics industry Heat Conduction Material
Poor thermal conductivity, product stability is poor, and cost performance is undesirable, is not able to satisfy a little in thermally conductive market to a large amount of of spherical magnesia powder
Demand.
Summary of the invention
The poor thermal conductivity of electronic component, product stability in the prior art be poor, cost performance is paid no attention in order to solve by the present invention
The problem of thinking provides a kind of mobility is high, heating conduction is excellent spherical magnesia and its manufacturing method.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of spherical shape magnesia, the spherical oxidation
Magnesium purity content >=85%, 2-150 μm of average grain diameter, sphericity >=0.86, water content≤8%wt, density 3.0-3.8g/cm3。
In technical solution, it is preferred that spherical shape magnesia purity content >=89%, 5-90 μm of average grain diameter, sphericity
>=0.90, water content≤6%wt, density 3.1-3.6g/cm3。
A kind of preparation method of spherical shape magnesia, includes the following steps:
1) purity 85%-99%, 2-150 μm of average grain diameter, moisture content≤4%wt, density 3.0-3.8g/cm are provided3's
Magnesium oxide powder；
2) magnesium oxide powder is melted to form spherical droplets shape melt by Verneuil method, combustion-supporting gas select oxygen and
Natural gas forms thermal-flame；
3) cooling and shaping forms spherical magnesia；
4) spherical magnesia is classified.
In technical solution, it is preferred that in step 1), the purity of magnesium oxide powder is 89%-99%, average grain diameter 5-90 μ
M, moisture content≤3%wt, density 3.1-3.6g/cm3。
In technical solution, it is preferred that in step 2), gas discharge 280-320m3/ h, oxygen flow 160-
200m3/h。
In technical solution, it is preferred that in step 2), calcination temperature is 2000-2800 DEG C.
In technical solution, it is preferred that in step 2), being melted in fusing system for magnesium oxide powder is carried out, fusing system
Interior temperature is 1300-1500 DEG C.
In technical solution, it is preferred that in step 3), cooling rate is 800-1000 DEG C/s.
In technical solution, it is preferred that in step 2), the pressure for inputting magnesium oxide powder is 0.01-0.04Kpa.
The advantages and positive effects of the present invention are: the spherical shape magnesia has specifically at being grouped as the equal grain of peace
Diameter, good sphericity, have preferable mobility, excellent heating conduction the features such as, dissipated using the electronics Heat Conduction Material manufactured goods
Hot property is excellent, long service life, and cost performance is high, high thermal conductivity coefficient, and monocrystalline thermal conductivity is higher than magnesia.
Detailed description of the invention
Fig. 1 is the electron microscope picture (multiplying power: 500 times) of the spherical magnesia of one embodiment of the invention.
Fig. 2 is the structural schematic diagram of the spherical magnesia preparation system of one embodiment of the invention.
In figure:
1, feeding system 2, combustion system 3, fusing system
4, cyclone system 5, cloth bag system 6, induced draught system
Specific embodiment
Embodiment 1
The preparation method of ball-aluminium oxide: purity 89%, 5-90 μm of average grain diameter, moisture content 4%wt, density are provided
3.0g/cm3Magnesium oxide powder be put into feeding system 1, with 0.01KPa pressure to combustion system 2 be fed, by burning
Oxygen, natural gas and magnesium oxide powder are entered in fusing system 3 by combustion system 2, oxygen, natural gas adsorption thermal-flame,
Flame melting, gas discharge 290m are carried out to magnesium oxide powder3/ h, oxygen flow 180m3/ h, 3 furnace temperature 1300 of fusing system
℃；Magnesium oxide powder is melted after passing through flame, cooled in 3 lower end of fusing system, is quickly cooled down 800 DEG C/s of rate；?
Cyclone system 4 is drawn to by pipeline by induced draught system 6 as spherical magnesia and cloth bag system 5 is classified, induced draught system 6
Flow 350m3/ h, cyclone system 4 are used to collect the spherical magnesia of 12um or more granularity, and cloth bag system 5 is for collecting 0.2um
The spherical magnesia of~12um, different size spherical shape magnesium oxide product is after detection is qualified, pack storage.Spherical magnesium oxide product
Electron microscope picture (multiplying power: 500 times) is as shown in Figure 1, product is in spherical.Spherical magnesia preparation system is as shown in Figure 2.
Embodiment 2
The preparation method of ball-aluminium oxide: purity 85%, 5-90 μm of average grain diameter, moisture content 3%wt, density are provided
3.1g/cm3Magnesium oxide powder be put into feeding system 1, with 0.016KPa pressure to combustion system 2 be fed, by burning
Oxygen, natural gas and magnesium oxide powder are entered in fusing system 3 by combustion system 2, oxygen, natural gas adsorption thermal-flame,
Flame melting, gas discharge 300m are carried out to magnesium oxide powder3/ h, oxygen flow 160m3/ h, 3 furnace temperature 1500 of fusing system
℃；Magnesium oxide powder is melted after passing through flame, cooled in 3 lower end of fusing system, is quickly cooled down 900 DEG C/s of rate；?
Cyclone system 4 is drawn to by pipeline by induced draught system 6 as spherical magnesia and cloth bag system 5 is classified, induced draught system 6
Flow 300m3/ h, cyclone system 4 are used to collect the spherical magnesia of 12um or more granularity, and cloth bag system 5 is for collecting 0.2um
The spherical magnesia of~12um, different size spherical shape magnesium oxide product is after detection is qualified, pack storage.
Embodiment 3
The preparation method of ball-aluminium oxide: purity 99%, 5-90 μm of average grain diameter, moisture content 1.5%wt, density are provided
3.6g/cm3Magnesium oxide powder be put into feeding system 1, with 0.04KPa pressure to combustion system 2 be fed, by the oxygen of burning
Gas, natural gas and magnesium oxide powder are entered in fusing system 3 by combustion system 2, and oxygen, natural gas adsorption thermal-flame are right
Magnesium oxide powder carries out flame melting, gas discharge 280m3/ h, oxygen flow 170m3/ h, 1400 DEG C of 3 furnace temperature of fusing system；
Magnesium oxide powder is melted after passing through flame, cooled in 3 lower end of fusing system, is quickly cooled down 1000 DEG C/s of rate；At
Cyclone system 4 is drawn to by pipeline by induced draught system 6 for spherical magnesia and cloth bag system 5 is classified, induced draught system 6
Flow 200m3/ h, cyclone system 4 are used to collect the spherical magnesia of 12um or more granularity, and cloth bag system 5 is for collecting 0.2um
The spherical magnesia of~12um, different size spherical shape magnesium oxide product is after detection is qualified, pack storage.
Embodiment 4
The preparation method of ball-aluminium oxide: purity 93%, 5-90 μm of average grain diameter, moisture content 1%wt, density are provided
3.8g/cm3Magnesium oxide powder be put into feeding system 1, with 0.02KPa pressure to combustion system 2 be fed, by burning
Oxygen, natural gas and magnesium oxide powder are entered in fusing system 3 by combustion system 2, oxygen, natural gas adsorption thermal-flame,
Flame melting, gas discharge 320m are carried out to magnesium oxide powder3/ h, oxygen flow 200m3/ h, 3 furnace temperature 1350 of fusing system
℃；Magnesium oxide powder is melted after passing through flame, cooled in 3 lower end of fusing system, is quickly cooled down 950 DEG C/s of rate；?
Cyclone system 4 is drawn to by pipeline by induced draught system 6 as spherical magnesia and cloth bag system 5 is classified, induced draught system 6
Flow 100m3/ h, cyclone system 4 are used to collect the spherical magnesia of 12um or more granularity, and cloth bag system 5 is for collecting 0.2um
The spherical magnesia of~12um, different size spherical shape magnesium oxide product is after detection is qualified, pack storage.
Above each test result is as shown in the table.
| Detection project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| Purity (%) | 89 | 85 | 99 | 93 |
| Moisture content (%) | 3.5 | 4.2 | 5.1 | 4.3 |
| Conductivity | 111.8 | 109.9 | 105.8 | 106.32 |
| PH value | 10.85 | 10.96 | 10.2 | 10.53 |
| Spherical rate (%) | 93 | 95 | 94 | 95 |
It was found from the result shown in the upper table: embodiment 1-4 spherical shape magnesium oxide product all has preferable sphericity and conduction
Rate.
Four embodiments of the invention are described in detail above, but the content is only preferable implementation of the invention
Example, should not be considered as limiting the scope of the invention.It is all according to all the changes and improvements made by the present patent application range
Deng should still be within the scope of the patent of the present invention.
Claims (9)
1. a kind of spherical shape magnesia, it is characterised in that: spherical shape magnesia purity content >=85%, 2-150 μm of average grain diameter,
Sphericity >=0.86, water content≤8%wt, density 3.0-3.8g/cm3。
2. spherical shape magnesia according to claim 1, it is characterised in that: spherical shape magnesia purity content >=89%,
5-90 μm of average grain diameter, sphericity >=0.90, water content≤6%wt, density 3.1-3.6g/cm3。
3. a kind of preparation method of spherical shape magnesia, which comprises the steps of:
1) purity 85%-99%, 2-150 μm of partial size, moisture content≤4%wt, density 3.0-3.8g/cm are provided3Magnesia powder
End；
2) magnesium oxide powder is melted to form spherical droplets shape melt by Verneuil method, combustion-supporting gas selects oxygen and natural
Gas forms thermal-flame；
3) cooling and shaping forms spherical magnesia；
4) spherical magnesia is classified.
4. the preparation method of spherical shape magnesia according to claim 3, it is characterised in that: in step 1), magnesium oxide powder
Purity be 89%-99%, 5-90 μm of partial size, moisture content≤3%wt, density 3.1-3.6g/cm3。
5. the preparation method of spherical shape magnesia according to claim 3, it is characterised in that: in step 2), gas discharge
For 280-320m3/ h, main oxygen flow are 160-200m3/h。
6. the preparation method of spherical shape magnesia according to claim 3, it is characterised in that: in step 2), calcination temperature is
2000-2800℃。
7. the preparation method of spherical shape magnesia according to claim 3, it is characterised in that: in step 2), magnesium oxide powder
Be melted in fusing system and carry out, temperature is 1300-1500 DEG C in fusing system.
8. the preparation method of spherical shape magnesia according to claim 3, it is characterised in that: in step 3), cooling rate is
800-1000℃/s。
9. the preparation method of spherical shape magnesia according to claim 3, it is characterised in that: in step 2), input magnesia
The pressure of powder is 0.01-0.04Kpa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810907532.1A CN109095482A (en) | 2018-08-10 | 2018-08-10 | A kind of spherical shape magnesia and its manufacturing method |
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| CN201810907532.1A CN109095482A (en) | 2018-08-10 | 2018-08-10 | A kind of spherical shape magnesia and its manufacturing method |
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| CN109095482A true CN109095482A (en) | 2018-12-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113264543A (en) * | 2021-04-14 | 2021-08-17 | 雅安百图高新材料股份有限公司 | Control method for maximum particle size of spherical alumina |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2590491B2 (en) * | 1987-10-20 | 1997-03-12 | 旭硝子株式会社 | Method for producing magnesium oxide-based material |
| CN1839182A (en) * | 2003-10-03 | 2006-09-27 | 达泰豪化学工业株式会社 | Spherical coated magnesium oxide powder and method for production thereof, and resin composition comprising the powder |
| CN107555455A (en) * | 2017-08-31 | 2018-01-09 | 天津泽希矿产加工有限公司 | Electronics heat conduction ball-aluminium oxide and manufacture method |
-
2018
- 2018-08-10 CN CN201810907532.1A patent/CN109095482A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2590491B2 (en) * | 1987-10-20 | 1997-03-12 | 旭硝子株式会社 | Method for producing magnesium oxide-based material |
| CN1839182A (en) * | 2003-10-03 | 2006-09-27 | 达泰豪化学工业株式会社 | Spherical coated magnesium oxide powder and method for production thereof, and resin composition comprising the powder |
| CN107555455A (en) * | 2017-08-31 | 2018-01-09 | 天津泽希矿产加工有限公司 | Electronics heat conduction ball-aluminium oxide and manufacture method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113264543A (en) * | 2021-04-14 | 2021-08-17 | 雅安百图高新材料股份有限公司 | Control method for maximum particle size of spherical alumina |
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Application publication date: 20181228 |