CN104909762A - Spherical large particle aluminum nitride powder preparation method - Google Patents
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Abstract
The invention relates to a spherical large particle aluminum nitride powder preparation method, and belongs to the field of powder metallurgy. The spherical large particle aluminum nitride powder preparation method is characterized in that aluminum nitride powder, a binder, a sintering aid and a dispersing agent are mixed in an organic solvent to prepare a slurry, spray granulation is performed to obtain spherical aluminum nitride aggregate adopted as the granulating material, and then high temperature calcination and ball milling dispersion are performed to prepare the spherical aluminum nitride powder, wherein the sphericity of the obtained spherical aluminum nitride powder is 0.65-0.9, the particle size is 5-80 [mu]m, the apparent density is 0.85-1.1 g/cm<3>, and the tap density is 1.0-1.25 g/cm<3>. According to the present invention, the aluminum nitride powder prepared through the method has characteristics of high sphericity, uniform particle size and good fluidity, the preparation process is simple, the production cost is low, and the prepared powder can be used for thermally conductive plastic fillers.
Description
Technical field
The invention belongs to field of powder metallurgy, relate to a kind of preparation method of spherical macro aluminium nitride powder.
Technical background
Aluminium nitride ceramics has higher thermal conductivity, and its theoretical value is 320W/m.K, higher electrical insulating property, and the thermal expansivity matched with silicon is widely used in electronic devices and components at present as heat sink material.But these application belong to and directly use aluminium nitride ceramics, and along with the development of illuminating industry, heat-conducting plastic is for the manufacture of in LED lamp cover and automobile, and heat-conducting plastic utilizes heat conductive filler to carry out uniform filling to macromolecule matrix material, to improve its heat conductivility.Compared with traditional aluminium, heat-conducting plastic goods have lightweight, and formed machining is convenient, can be the same with other plastics, and through once-forming, produce thin-walled and complicated shape part, product design degree of freedom is high; In addition, due to metal shell conduction, inside must adopt isolation start up system, to prevent from getting an electric shock, and heat-conducting plastic insulation, as non-isolated system can be adopted during heat-removal system to start, save cost and to take up space less.
Heat-conducting plastic main component comprises body material and filler, and body material comprises PPS, PA6/PA66, PC, PP etc., and filler comprises AlN, SiC, Al
2o
3, BN etc.Its heat conductivility utilizes thermal conductivity (unit: W/m.K) to weigh.And the method improving its heat conductivility is the thermal conductivity of raising body material and adopts high heat-conducting as filler, raising proportion of filler and undertaken by the bonding interface several respects improving filler and basic material, and the ratio that filler adds has higher impact for the heat conductivility of heat-conducting plastic, in order to improve the loadings of powder, particle diameter must be prepared several microns of Spherical aluminum nitride powder with tens microns, to obtain good fluidity, intensity is high, the heat-conducting plastic that powder loading level is large.And the aluminium nitride powder of tradition preparation adopts direct nitridation method or carbothermic method to produce, the powder that the former prepares is after fragmentation, obtain powder thickness uneven, out-of-shape, powder diameter prepared by the latter is less, general at 1 microns, and shape is aspherical, is therefore difficult to obtain high filler loading capacity heat-conducting plastic.
Have in several as (CN103079995A) and (CN102686511A) about the patent preparing spherical aluminum nitride and aluminum oxide or hydrated alumina are mixed with carbon dust and fusing assistant, this mixed powder is used to react at a certain temperature, synthesis aluminum nitride powder, add heat extraction surplus carbon in atmosphere, thus obtain Spherical aluminum nitride powder, but aluminium nitride powder prepared by the method, carbon dust easily wraps up or carbon atom is solid-solution in aluminium nitride powder, affect aluminium nitride powder thermal conductivity, and obtained powder color is comparatively dark, attractive in appearance for affecting in heat-conducting plastic.
Summary of the invention
The object of this invention is to provide a kind of preparation method of spherical macro aluminium nitride powder.
Technical scheme is: by aluminium nitride powder, binding agent, sintering agent, dispersion agent mixes in organic solvent, be made into slurry, obtain spherical aluminum nitride coacervate as granulation material by mist projection granulating, then obtain Spherical aluminum nitride powder through high-temperature calcination, Ball milling technique.
Operation steps of the present invention is:
Step one, batching: by aluminium nitride powder, binding agent, sintering agent, dispersion agent, alcohol are prepared burden according to mass percent: aluminium nitride powder 30%-60%, binding agent 0.03%-5%, sintering agent 2%-10%, dispersion agent 0.5%-5%, alcohol 30%-65%;
Step 2, preparation slurry: adopt ball milling, stirs or step one Raw mixes by ultrasonic wave dispersion, makes stable slurry;
Step 3, mist projection granulating: the slurry prepared in step 2 is controlled charging by peristaltic pump and adds in sponging granulator.By controlling feed slurry inlet, temperature out, spray pressure, obtains aluminium nitride granulation material
Step 4, calcining: obtained aluminium nitride granulation material is placed in and burns boat, calcine in sintering oven under flowing nitrogen atmosphere, obtained Spherical aluminum nitride powder.Calcining temperature, according to the difference of sintering agent, selects 1450 DEG C to 1850 DEG C, calcination time 30min-1000min.
Step 5, Ball milling: obtained Spherical aluminum nitride powder, sphericity is 0.65 ~ 0.9, and granularity is at 5 ~ 80 μm, and loose density is 0.85 ~ 1.1g/cm
3, tap density is 1.0 ~ 1.25g/cm
3.Described aluminium nitride powder raw material granularity is 0.5 micron ~ 5 microns.
In step one, sintering agent is one or more in yttrium oxide, lanthanum trioxide, cerium oxide, magnesium oxide, calcium oxide, Lithium Oxide 98min; Binding agent is one or more in rubber gasoline, EVA, resol, epoxy resin;
In step one, dispersion agent is stearic acid, one or more in hexenyl bis-stearamides, Tristearoylglycerol, polyoxyethylene glycol;
In the method, by aluminium nitride powder and dispersion agent, binding agent, sintering agent is by stirring, and ball milling and ultrasonic wave are disperseed, make the slurry of good fluidity, by slurry by feed appliance send into mist projection granulating and in, by control temperature and pressure, the obtained mist projection granulating material such as feeding speed, mist projection granulating material is placed in sintering oven calcine, obtained Spherical aluminum nitride powder.By the pattern of sem observation powder stock, granulation material, final product; Loose density instrument and tap density meter is utilized to measure loose density and the tap density of powder.
Gained Spherical aluminum nitride powder of the present invention, sphericity is 0.65 ~ 0.9, and granularity is at 5 ~ 80 μm, and loose density is 0.85 ~ 1.1g/cm
3, tap density is 1.0 ~ 1.25g/cm
3.Aluminium nitride powder sphericity prepared by the inventive method is high, uniform particle sizes, good fluidity.Preparation technology is simple, and production cost is low, and the powder of preparation can be applicable to heat-conducting plastic filler.
Embodiment
Be further described the present invention below, the parameter index in embodiment is measured by following method.
1. median size
Median size (D50) is for carry out ultrasonic wave dispersion in the solution by sample, and recycling laser particle analyzer measures.
2. sphericity
Utilize the subsidiary scale function of scanning electronic microscope, random selecting 50 particles, measure the ratio of particle minor axis (DS) and particle aspect (DL), namely sphericity is: DS/DL.
3. loose density and tap density
Loose density refers to that powder is freely full of tap density measured after standard container under prescribed conditions, and the quality of unit volume when namely pulverulent bulk is loaded, unit represents with g/cm3.Tap density refers to the quality of the unit volume that the powder in container is under prescribed conditions measured after jolt ramming, and unit represents with g/cm3.
Embodiment 1:
By aluminium nitride powder 1000g (D50=0.5 μm), yttrium oxide powder 50g (D50=50nm), EVA30g, Tristearoylglycerol 10g, alcohol 1500g, put into ball grinder, grind 12 hours, join to obtain slurry, then slurry is sent in spray-dryer centrifugal atomizer by peristaltic pump, centrifugal atomizer rotating speed is 8500rpm, intake air temperature 220 DEG C, air outlet temperature 115 DEG C, by receive after granulation material crosses 80 mesh sieves, granulation material is put into boron nitride crucible, in vacuum carbon tube furnace, pass into flowing nitrogen, 1820 DEG C are heated to 10 DEG C/min, be incubated 2 hours, after calcining, powder is in ball grinder, put into alcohol, ball milling is carried out with alumina balls, obtain Spherical aluminum nitride powder after drying.
The aluminium nitride powder prepared by above-mentioned technique, its sphericity is 0.7, and diameier is D50=10 μm, and loose density is 0.9g/cm
3, tap density is 1.05g/cm
3.
Embodiment 2:
By aluminium nitride powder 1000g (D50=0.5 μm), lanthanum trioxide powder 50g (D50=50nm), EVA30g, hexenyl bis-stearamides 15g, alcohol 1200g, put into ball grinder, grind 12 hours, join to obtain slurry, then slurry is sent in spray-dryer centrifugal atomizer by peristaltic pump, centrifugal atomizer rotating speed is 8500rpm, intake air temperature 220 DEG C, air outlet temperature 115 DEG C, by receive after granulation material crosses 80 mesh sieves, granulation material is put into boron nitride crucible, in vacuum carbon tube furnace, pass into flowing nitrogen, 1850 DEG C are heated to 10 DEG C/min, be incubated 2 hours, after calcining, powder is in ball grinder, put into alcohol, Ball milling is carried out with alumina balls, obtain Spherical aluminum nitride powder after drying.
The aluminium nitride powder prepared by above-mentioned technique, its sphericity is 0.8, and diameier is D50=25 μm, and loose density is 0.97g/cm
3, tap density is 1.16g/cm
3.
Embodiment 3:
By aluminium nitride powder 1000g (D50=0.5 μm), cerium oxide powder 50g (D50=50nm), EVA30g, polyoxyethylene glycol 10g, alcohol 1000g, put into ball grinder, grind 12 hours, join to obtain slurry, then slurry is sent in spray-dryer centrifugal atomizer by peristaltic pump, centrifugal atomizer rotating speed is 8500rpm, intake air temperature 220 DEG C, air outlet temperature 115 DEG C, by receive after granulation material crosses 80 mesh sieves, granulation material is put into boron nitride crucible, in vacuum carbon tube furnace, pass into flowing nitrogen, 1840 DEG C are heated to 10 DEG C/min, be incubated 2 hours, after calcining, powder is in ball grinder, put into alcohol, Ball milling is carried out with alumina balls, obtain Spherical aluminum nitride powder after drying.
The aluminium nitride powder prepared by above-mentioned technique, its sphericity is 0.83, and diameier is D50=40 μm, and loose density is 1.01g/cm
3, tap density is 1.22g/cm
3.
Embodiment 4:
By aluminium nitride powder 1000g (D50=0.5 μm), magnesia powder 50g (D50=50nm), epoxy resin 30g, polyoxyethylene glycol 10g, alcohol 1000g, put into ball grinder, grind 12 hours, join to obtain slurry, then slurry is sent in spray-dryer centrifugal atomizer by peristaltic pump, centrifugal atomizer rotating speed is 8500rpm, intake air temperature 220 DEG C, air outlet temperature 115 DEG C, by receive after granulation material crosses 80 mesh sieves, granulation material is put into boron nitride crucible, in vacuum carbon tube furnace, pass into flowing nitrogen, 1500 DEG C are heated to 10 DEG C/min, be incubated 6 hours, after calcining, powder is in ball grinder, put into alcohol, Ball milling is carried out with alumina balls, obtain Spherical aluminum nitride powder after drying.
The aluminium nitride powder prepared by above-mentioned technique, its sphericity is 0.75, and diameier is D50=35 μm, and loose density is 0.85g/cm
3, tap density is 1.01g/cm
3.
Embodiment 5:
By aluminium nitride powder 1000g (D50=0.5 μm), calcium oxide powder 50g (D50=50nm), epoxy resin 30g, polyoxyethylene glycol 10g, alcohol 1000g, put into ball grinder, grind 12 hours, join to obtain slurry, then slurry is sent in spray-dryer centrifugal atomizer by peristaltic pump, centrifugal atomizer rotating speed is 8000rpm, intake air temperature 225 DEG C, air outlet temperature 115 DEG C, by receive after granulation material crosses 80 mesh sieves, granulation material is put into boron nitride crucible, in vacuum carbon tube furnace, pass into flowing nitrogen, 1600 DEG C are heated to 10 DEG C/min, be incubated 4 hours, after calcining, powder is in ball grinder, put into alcohol, Ball milling is carried out with alumina balls, obtain Spherical aluminum nitride powder after drying.
The aluminium nitride powder prepared by above-mentioned technique, its sphericity is 0.9, and diameier is D50=60 μm, and loose density is 0.9g/cm
3, tap density is 1.05g/cm
3.
Embodiment 6:
By aluminium nitride powder 1000g (D50=0.5 μm), calcium oxide powder 50g (D50=50nm), epoxy resin 30g, polyoxyethylene glycol 10g, alcohol 900g, put into ball grinder, grind 12 hours, join to obtain slurry, then slurry is sent in spray-dryer centrifugal atomizer by peristaltic pump, centrifugal atomizer rotating speed is 7000rpm, intake air temperature 230 DEG C, air outlet temperature 115 DEG C, by receive after granulation material crosses 80 mesh sieves, granulation material is put into boron nitride crucible, in vacuum carbon tube furnace, pass into flowing nitrogen, 1600 DEG C are heated to 10 DEG C/min, be incubated 4 hours, after calcining, powder is in ball grinder, put into alcohol, Ball milling is carried out with alumina balls, obtain Spherical aluminum nitride powder after drying.
The aluminium nitride powder prepared by above-mentioned technique, its sphericity is 0.9, and diameier is D50=70 μm, and loose density is 1.10g/cm
3, tap density is 1.21g/cm
3.
Claims (5)
1. the preparation method of a spherical macro aluminium nitride powder, it is characterized in that, by aluminium nitride powder, binding agent, sintering agent, dispersion agent mixes in organic solvent, be made into slurry, obtain spherical aluminum nitride coacervate as granulation material by mist projection granulating, then obtain Spherical aluminum nitride powder through high-temperature calcination, Ball milling technique; Concrete preparation method is as follows:
Step one, batching: by aluminium nitride powder, binding agent, sintering agent, dispersion agent, alcohol are prepared burden according to mass percent: aluminium nitride powder 30%-60%, binding agent 0.03%-5%, sintering agent 2%-10%, dispersion agent 0.5%-5%, alcohol 30%-65%;
Step 2, preparation slurry: adopt ball milling, stirs or step one Raw mixes by ultrasonic wave dispersion, makes stable slurry;
Step 3, mist projection granulating: the slurry prepared in step 2 is controlled charging by peristaltic pump and adds in sponging granulator, by controlling feed slurry inlet, temperature out, spray pressure, obtains aluminium nitride granulation material;
Step 4, calcining: obtained aluminium nitride granulation material is placed in and burns boat, calcine in sintering oven under flowing nitrogen atmosphere;
Step 5, Ball milling obtains Spherical aluminum nitride powder.
2. the preparation method of spherical macro aluminium nitride powder according to claim 1, it is characterized in that, aluminium nitride powder raw material particle size used is 0.5 micron ~ 5 microns, and sintering agent is one or more in yttrium oxide, lanthanum trioxide, cerium oxide, magnesium oxide, calcium oxide, Lithium Oxide 98min.
3. the preparation method of spherical macro aluminium nitride powder according to claim 1, is characterized in that, binding agent is one or more in rubber gasoline, EVA, resol, epoxy resin; Dispersion agent is stearic acid, one or more in hexenyl bis-stearamides, Tristearoylglycerol, polyoxyethylene glycol.
4. the preparation method of spherical macro aluminium nitride powder according to claim 1, is characterized in that, the calcining temperature of step 4 is 1450 DEG C to 1850 DEG C, calcination time 30min-1000min.
5. the preparation method of spherical macro aluminium nitride powder according to claim 1, is characterized in that: prepare gained Spherical aluminum nitride powder, and sphericity is 0.65 ~ 0.9, and granularity is at 5 ~ 80 μm, and loose density is 0.85 ~ 1.1g/cm
3, tap density is 1.0 ~ 1.25g/cm
3.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106631046A (en) * | 2016-11-30 | 2017-05-10 | 莱鼎电子材料科技有限公司 | Composite sintering aid for producing aluminum nitride ceramic substrate |
| CN108706980A (en) * | 2018-06-27 | 2018-10-26 | 深圳市商德先进陶瓷股份有限公司 | Aluminium nitride ceramics and preparation method thereof, electrostatic chuck and application |
| CN109485420A (en) * | 2019-01-15 | 2019-03-19 | 景德镇陶瓷大学 | A method of improving the wet forming and agglutinating property of ceramic nano-powder body |
| CN109627547A (en) * | 2018-11-30 | 2019-04-16 | 全球能源互联网研究院有限公司 | Bitter earth nano ball and its preparation, using the high voltage direct current cable material of bitter earth nano ball and its preparation |
| CN109761206A (en) * | 2019-03-18 | 2019-05-17 | 青岛瓷兴新材料有限公司 | A kind of spherical beta silicon nitride powder of high-purity low aluminium, its manufacturing method and application |
| CN109790027A (en) * | 2017-08-11 | 2019-05-21 | 株式会社Lg化学 | The preparation method of Spherical aluminum nitride powder |
| CN110628223A (en) * | 2019-11-01 | 2019-12-31 | 银川艾森达新材料发展有限公司 | Heat-conducting filler |
| CN110903094A (en) * | 2019-12-25 | 2020-03-24 | 苏州纳迪微电子有限公司 | Spherical aluminum nitride and preparation method and application thereof |
| CN114570475A (en) * | 2022-03-23 | 2022-06-03 | 福建华清电子材料科技有限公司 | Processing equipment and preparation method of high-sphericity aluminum nitride powder |
| CN114655938A (en) * | 2022-05-23 | 2022-06-24 | 苏州锦艺新材料科技股份有限公司 | Preparation method of spherical aluminum nitride granulation powder and filler powder |
| CN115196970A (en) * | 2022-08-08 | 2022-10-18 | 四川大学 | Preparation method of high-fluidity AlON spherical powder |
| CN116003879A (en) * | 2023-01-05 | 2023-04-25 | 江苏联瑞新材料股份有限公司 | Rapid preparation method of spherical silicon nitride powder |
| CN116253571A (en) * | 2023-03-16 | 2023-06-13 | 无锡海古德新技术有限公司 | Aluminum nitride ceramic granulating powder and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002179413A (en) * | 2000-12-13 | 2002-06-26 | National Institute Of Advanced Industrial & Technology | Spherical aluminum nitride filler and method of producing the same |
| CN102686511A (en) * | 2010-01-29 | 2012-09-19 | 株式会社德山 | Process for production of spherical aluminum nitride powder, and spherical aluminum nitride powder produced by the process |
| CN103079995A (en) * | 2010-09-03 | 2013-05-01 | 株式会社德山 | Spherical aluminum nitride powder |
| CN103172380A (en) * | 2013-02-04 | 2013-06-26 | 常熟华融太阳能新型材料科技有限公司 | Spray granulation method of non-oxide ceramic powder |
-
2015
- 2015-05-26 CN CN201510276621.7A patent/CN104909762A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002179413A (en) * | 2000-12-13 | 2002-06-26 | National Institute Of Advanced Industrial & Technology | Spherical aluminum nitride filler and method of producing the same |
| CN102686511A (en) * | 2010-01-29 | 2012-09-19 | 株式会社德山 | Process for production of spherical aluminum nitride powder, and spherical aluminum nitride powder produced by the process |
| CN103079995A (en) * | 2010-09-03 | 2013-05-01 | 株式会社德山 | Spherical aluminum nitride powder |
| CN103172380A (en) * | 2013-02-04 | 2013-06-26 | 常熟华融太阳能新型材料科技有限公司 | Spray granulation method of non-oxide ceramic powder |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106631046A (en) * | 2016-11-30 | 2017-05-10 | 莱鼎电子材料科技有限公司 | Composite sintering aid for producing aluminum nitride ceramic substrate |
| CN109790027A (en) * | 2017-08-11 | 2019-05-21 | 株式会社Lg化学 | The preparation method of Spherical aluminum nitride powder |
| CN108706980A (en) * | 2018-06-27 | 2018-10-26 | 深圳市商德先进陶瓷股份有限公司 | Aluminium nitride ceramics and preparation method thereof, electrostatic chuck and application |
| CN109627547A (en) * | 2018-11-30 | 2019-04-16 | 全球能源互联网研究院有限公司 | Bitter earth nano ball and its preparation, using the high voltage direct current cable material of bitter earth nano ball and its preparation |
| CN109485420A (en) * | 2019-01-15 | 2019-03-19 | 景德镇陶瓷大学 | A method of improving the wet forming and agglutinating property of ceramic nano-powder body |
| CN109761206A (en) * | 2019-03-18 | 2019-05-17 | 青岛瓷兴新材料有限公司 | A kind of spherical beta silicon nitride powder of high-purity low aluminium, its manufacturing method and application |
| CN110628223A (en) * | 2019-11-01 | 2019-12-31 | 银川艾森达新材料发展有限公司 | Heat-conducting filler |
| CN110903094A (en) * | 2019-12-25 | 2020-03-24 | 苏州纳迪微电子有限公司 | Spherical aluminum nitride and preparation method and application thereof |
| CN114570475A (en) * | 2022-03-23 | 2022-06-03 | 福建华清电子材料科技有限公司 | Processing equipment and preparation method of high-sphericity aluminum nitride powder |
| CN114655938A (en) * | 2022-05-23 | 2022-06-24 | 苏州锦艺新材料科技股份有限公司 | Preparation method of spherical aluminum nitride granulation powder and filler powder |
| CN115196970A (en) * | 2022-08-08 | 2022-10-18 | 四川大学 | Preparation method of high-fluidity AlON spherical powder |
| CN116003879A (en) * | 2023-01-05 | 2023-04-25 | 江苏联瑞新材料股份有限公司 | Rapid preparation method of spherical silicon nitride powder |
| CN116003879B (en) * | 2023-01-05 | 2023-12-22 | 江苏联瑞新材料股份有限公司 | Rapid preparation method of spherical silicon nitride powder |
| CN116253571A (en) * | 2023-03-16 | 2023-06-13 | 无锡海古德新技术有限公司 | Aluminum nitride ceramic granulating powder and preparation method thereof |
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