CN106046862A - Boron nitride-covered spherical aluminum oxide and a preparing method thereof - Google Patents
Boron nitride-covered spherical aluminum oxide and a preparing method thereof Download PDFInfo
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- CN106046862A CN106046862A CN201610301797.8A CN201610301797A CN106046862A CN 106046862 A CN106046862 A CN 106046862A CN 201610301797 A CN201610301797 A CN 201610301797A CN 106046862 A CN106046862 A CN 106046862A
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- boron nitride
- ball
- aluminium oxide
- cladding
- aluminum oxide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/40—Compounds of aluminium
- C09C1/407—Aluminium oxides or hydroxides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
- C09C3/063—Coating
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
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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
- 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
- C01P2004/00—Particle morphology
- C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Boron nitride-covered spherical aluminum oxide and a preparing method thereof are provided. A compact boron nitride covering layer is on the surface of the spherical aluminum oxide. The spherical aluminum oxide is covered with boron nitride flaky microparticles, and therefore defects that spherical aluminum oxide is high in abrasion for mixing device molds due to high hardness and causes high damages to power original parts due to high hardness are overcome.
Description
Technical field
The present invention relates to the ball-aluminium oxide of a kind of boron nitride cladding, belong to heat filling field.The invention still further relates to
State the preparation method of the ball-aluminium oxide of boron nitride cladding.
Background technology
Ball-aluminium oxide is a kind of conventional heat filling, but there is the high shortcoming big to abrasions such as moulds of hardness.Such as exist
Chinese patent CN104559136A discloses use aluminium oxide and prepares epoxy resin, compound polyurethane material, although possess good
Good heat conductivility, but owing to the high rigidity of aluminium oxide can cause damaging mould in molding process.This external Chinese patent
CN102363577A discloses production method of a kind of heat conducting high-temperature alumina filling material and products thereof.Including: (1) is with oxidation
Aluminum or aluminium hydroxide are raw material, add mineralizer；(2) shuttle kiln or tunnel cave is utilized to forge at a temperature of 1300-1500 DEG C
Burn, insulation；(3) product after sintering soak is ground to form varigrained micropowder, to obtain final product.The inventive method can prepare height
Proportion, high fill-ratio, the heat conducting high-temperature alumina filling material of low oil absorbency, obtained product thermal conductivity values is high, oil absorbency≤mg/
100ml Oleum Ricini, tight dress density is 1.8～2.1g/cm3.Product prepared by the method can filling out as insulating heat-conductive polymer
Material, is widely used in the fields such as heat-conducting plastic, heat conductive rubber, heat-conductive bonding agent, heat-conductive coating.But the aluminium oxide of this invention is same
There is much higher hard in sample, when mechanographs such as being applied to plastics be can major injury die life, and more mold exchange can be made to enterprise
Become the biggest cost burden.
The technology of existing raising heat conduction is to be used in mixed way, ball-aluminium oxide (firmly) and boron nitride owing to aluminium oxide causes firmly
Boron nitride sheet crushes, and result heat conduction declines.This patent ball aluminum surface has boron nitride (soft) to be coated with, so not having boron nitride sheet to crush
Problem.
From the foregoing, the present inventor have developed the novel cladding on a kind of ball aluminum surface and solves the abrasion of ball aluminum
Big problem also improves thermal conductivity simultaneously.
Summary of the invention
Present invention aim at the deficiency for existing aluminium oxide heat filling abrasion mould, it is provided that a kind of novel nitridation
Boron coated aluminum oxide, is not only able to effectively prevent and treat mould and is worn and torn by the aluminium oxide of extreme hardness, additionally it is possible to be effectively improved thermal conductivity,
Therefore the cost of enterprise is significantly reduced.
The present invention uses following technical scheme:
1, the ball-aluminium oxide of a kind of boron nitride cladding, it is characterised in that alumina surface exists close boron nitride cladding
Layer.
2, the ball-aluminium oxide being coated with according to the boron nitride of 1, it is characterised in that: the ball-aluminium oxide of described boron nitride cladding
Average spherical degree be more than 0.8.
3, the ball-aluminium oxide being coated with according to the boron nitride of 1 or 2, it is characterised in that: described boron nitride layer is by boron nitride sheet
Dress granule composition, the longest particle diameter of its in-plane is less than 5 microns.
4, the ball-aluminium oxide being coated with according to the boron nitride of 3, it is characterised in that: described boron nitride weight content is gross weight
0.1-50%.
5, the ball-aluminium oxide being coated with according to the boron nitride of 4, it is characterised in that the ball-aluminium oxide of described boron nitride cladding
Mean diameter is 5 to 150 microns.
6, the preparation method of the ball-aluminium oxide of the boron nitride cladding described in 1-5, it is characterised in that comprise the following steps: will
Ball-aluminium oxide and boron nitride carry out mechanical mixture according to the ratio of weight ratio 100: 2-20, incorporation time be 6 minutes little to 1
Time, obtain finished product.
Additionally, organic or inorganic binding agent also can be added in the mixed process of described 6.Organic binder such as asphalt mixtures modified by epoxy resin
Fat, acryl resin, polyurethane etc., inorganic binding agent such as silica sol, phosphate cpd, aluminium hydroxide etc. are suitable for this
Bright.Cement is usually 0.1 to the 10wt% of boron nitride, preferably 0.4-6wt%, further preferably 0.8-4%, further preferably
1-2%.
Described boron nitride weight content in 0.1-50% (based on aluminium oxide and boron nitride gross weight), preferably 0.5-40%,
More preferably 1-30%, further preferably 4-10%, wherein the weight content of boron nitride can also be preferably 2%, 6%, 8%, 12%,
24%, 30%.
Present invention process is simple, by using ball-aluminium oxide and boron nitride to carry out mechanical mixture and be effectively prepared for boron nitride
The ball-aluminium oxide that uniform close covers.Laminated structure and effective particle diameter due to boron nitride, it is possible to do not losing heat conduction effect
On the premise of Guo, at utmost reduce the ball-aluminium oxide abrasion for mould.And the method for the present invention uses physics completely
Mixing, is added without unnecessary small organic agents, the safety of material has been effectively ensured.
Accompanying drawing explanation
Fig. 1 boron nitride cladding ball-aluminium oxide schematic diagram.
Fig. 2 is boron nitride schematic diagram.
Fig. 3 is the boron nitride arrangement in spherical aluminum.
Fig. 4 is the Electronic Speculum figure of raw material spherical aluminum.
Fig. 5 is the spherical aluminum Electronic Speculum figure of cladding boron nitride.
Fig. 6 is the boron nitride details Electronic Speculum figure of cladding 1 micron in spherical aluminum
Drawing reference numeral: 1 ... ball-aluminium oxide 2 ... boron nitride 3 ... direction major diameter 4 in boron nitride face ...
Boron nitride
Detailed description of the invention:
Embodiment: 1
Boron nitride and ball aluminum are coordinated in the ratio of the embodiment 1 in table 1, within 6 minutes, must be implemented with rotation-revolution mixer
Example 1 sample.There is equal borazon clad in ball aluminum surface after mixed processing seen from electron microscopic observation.The direction, face of boron nitride is
Major diameter is less than 5 microns.
Embodiment: 2
Boron nitride and ball aluminum are coordinated in the ratio of the embodiment 2 in table 1, within 15 minutes, must be implemented with rotation-revolution mixer
Example 2 sample.There is equal borazon clad in ball aluminum surface after mixed processing seen from electron microscopic observation.
Embodiment: 3
Boron nitride and ball aluminum are coordinated in the ratio of the embodiment 3 in table 1, within 25 minutes, must be implemented with rotation-revolution mixer
Example 3 sample.There is equal borazon clad in ball aluminum surface after mixed processing seen from electron microscopic observation.
Embodiment: 4
Boron nitride and ball aluminum are coordinated in the ratio of the embodiment 4 in table 1, within 30 minutes, must be implemented with rotation-revolution mixer
Example 4 sample.There is equal borazon clad in ball aluminum surface after mixed processing seen from electron microscopic observation.
Embodiment: 5
Boron nitride and ball aluminum are coordinated in the ratio of the embodiment 5 in table 1, within 60 minutes, must be implemented with rotation-revolution mixer
Example 5 sample.There is equal borazon clad in ball aluminum surface after mixed processing seen from electron microscopic observation.
Embodiment: 6
Boron nitride and ball aluminum are coordinated in the ratio of the embodiment 6 in table 1, within 30 minutes, must be implemented with rotation-revolution mixer
Example 6 sample.There is equal borazon clad in ball aluminum surface after mixed processing seen from electron microscopic observation.
Embodiment: 7
Boron nitride and ball aluminum are coordinated in the ratio of the embodiment 7 in table 1, within 15 minutes, must be implemented with rotation-revolution mixer
Example 7 sample.There is equal borazon clad in ball aluminum surface after mixed processing seen from electron microscopic observation.
Comparative example: 1-7
Using the ball aluminum in embodiment 1-7, carry out wear test in the case of not adding boron nitride, its result is at table
In 1, " abrasion (milligram) (container content sample is ball aluminum) of polypropylene containers " part is listed.
Table 1
It can be seen that when using pure ball aluminum to carry out wear test, wear extent is much larger than using boron nitride bag from above-mentioned table
Cover the wear extent of ball aluminum.The wherein boron nitride coated ball aluminum of embodiment 4 and 5 wear extent even 0 to mould.
Embodiment 8:
The boron nitride of embodiment 7 is coated with ball-aluminium oxide 250 weight portion and 100 weight portions molecular weight about 90,000 two
Disperse with metal three cylinder after methyl-silicone oil mixing, cross and roll 3 times to obtain paste.
Comparative example 8:
By raw material ball-aluminium oxide 250 weight portion without boron nitride cladding and 100 weight portions of mean diameter 45 μm
Disperse with metal three cylinder after the dimethicone mixing of molecular weight about 90,000, cross and roll 3 times to obtain paste.
Abrasion roll because of metal with the paste that the paste of embodiment 8 (white substantially) compares comparative example 8 seriously, color
Substantially deepen aobvious Dark grey.
Abrasion loss method of testing:
The polypropylene containers weight of first precise rotation-revolution mixer.Add embodiment 1-7 corresponding ball aluminum feedstock
Again weigh polypropylene containers and weigh after complete for sample portion being removed after boron nitride coated ball aluminum sample mixed one minute.Before mixing
After container weight difference be abrasion loss.
Average spherical degree measuring method:
Taking pictures granule by scanning electron microscope, when particle diameter is more than 30 μm, use amplification is
500 times, particle diameter be 5 μm less than 30 μm time, using amplification is 3000 times, particle diameter be 1 μm with
When going up and be less than 5 μm, using amplification is 5000 times, and being less than 1 μm at particle diameter is that the amplification of use is 50000
Times, think that (SEM photograph) measures projected area (A) and the girth (PM) of granule from secondary electron reflection, and obtain by below equation
Average spherical degree.That is, if the orbicular area corresponding to girth (PM) is (B), sphericity A/B of its granule represents.False
If orbicular girth is identical with the girth of sample granule (PM), because PM=2 π r, B=π r2, so B=π × (PM/2 π)2,
The sphericity of this granule=A/B=A × 4 π/(PM)2.The sphericity of any 100 granules is obtained from SEM photograph image,
Their meansigma methods is as average spherical degree
Beneficial effect
The present invention can effectively prevent and treat mould and be worn and torn by the aluminium oxide of extreme hardness, additionally it is possible to be effectively improved thermal conductivity.
Above-mentioned only several specific embodiments in the present invention are illustrated, but can not be as the protection model of the present invention
Enclose, every zoom in or out according to the equivalence change done by the design spirit in the present invention or modification or equal proportion, all should
Think and fall into protection scope of the present invention.
Claims (6)
1. the ball-aluminium oxide of a boron nitride cladding, it is characterised in that alumina surface exists close boron nitride clad.
The ball-aluminium oxide of boron nitride the most according to claim 1 cladding, it is characterised in that: the spherical oxygen of described boron nitride cladding
The average spherical degree changing aluminum is more than 0.8.
3. the ball-aluminium oxide being coated with according to the boron nitride of claim 1 or 2, it is characterised in that: described boron nitride layer is by nitrogenizing
Boron granule on chip forms, and the longest particle diameter of its in-plane is less than 5 microns.
The ball-aluminium oxide of boron nitride the most according to claim 3 cladding, it is characterised in that: described boron nitride weight content is total
The 0.1-50% of weight.
The ball-aluminium oxide of boron nitride the most according to claim 4 cladding, it is characterised in that the spherical oxygen of described boron nitride cladding
Change aluminum mean diameter and be 5 to 150 microns.
6. the preparation method of the ball-aluminium oxide of the boron nitride cladding described in claim 1-5, it is characterised in that include following step
Rapid: ball-aluminium oxide and boron nitride are carried out mechanical mixture according to the ratio of weight ratio 100: 2-20, incorporation time be 6 minutes extremely
1 hour, obtain finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610301797.8A CN106046862A (en) | 2016-05-10 | 2016-05-10 | Boron nitride-covered spherical aluminum oxide and a preparing method thereof |
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| CN201610301797.8A CN106046862A (en) | 2016-05-10 | 2016-05-10 | Boron nitride-covered spherical aluminum oxide and a preparing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110452418A (en) * | 2019-09-25 | 2019-11-15 | 桂林电子科技大学 | A kind of high thermal conductivity Kapton and preparation method thereof of core-shell structure heat filling preparation |
| CN114044681A (en) * | 2021-11-24 | 2022-02-15 | 安徽壹石通材料科技股份有限公司 | Boron nitride composite microsphere and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110452418A (en) * | 2019-09-25 | 2019-11-15 | 桂林电子科技大学 | A kind of high thermal conductivity Kapton and preparation method thereof of core-shell structure heat filling preparation |
| CN110452418B (en) * | 2019-09-25 | 2021-03-02 | 桂林电子科技大学 | High-thermal-conductivity polyimide film prepared from core-shell structure heat-conducting filler and preparation method thereof |
| CN114044681A (en) * | 2021-11-24 | 2022-02-15 | 安徽壹石通材料科技股份有限公司 | Boron nitride composite microsphere and preparation method thereof |
| CN114044681B (en) * | 2021-11-24 | 2022-11-04 | 安徽壹石通材料科技股份有限公司 | Boron nitride composite microsphere and preparation method thereof |
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Application publication date: 20161026 |