CN103232247A - Preparation method of alumina polycrystalline material block - Google Patents

Preparation method of alumina polycrystalline material block Download PDF

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CN103232247A
CN103232247A CN2013101344204A CN201310134420A CN103232247A CN 103232247 A CN103232247 A CN 103232247A CN 2013101344204 A CN2013101344204 A CN 2013101344204A CN 201310134420 A CN201310134420 A CN 201310134420A CN 103232247 A CN103232247 A CN 103232247A
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powder
particle size
density
polycrystalline
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归琰
杨秋红
陆神州
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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Abstract

本发明涉及一种氧化铝多晶料块的制备方法,属于特种陶瓷制备工艺技术领域。采用两种或三种醇铝法生产的商业高纯5N(99.999%)a-Al2O3粉料为起始原料,采用理论模型计算和通过实验修正的方式确定各粉料颗粒间最优化尺寸之比及所占数量比例关系,并通过冷等静压工艺将混合粉料压制块状料,再经高温烧结制备出密度大于3.6g/cm3(相对密度大于90%)的a-Al2O3多晶块料。制得的a-Al2O3多晶块料中,小粒径粉料会填补大尺寸颗粒之间的空隙,粉料间接触更多,相互作用更大,因而在压制成型及高温烧结过程中不易发生碎裂,易于获得大尺寸的产品,并且其烧成密度相对市售氧化铝饼块料更高。

The invention relates to a method for preparing alumina polycrystalline blocks, and belongs to the technical field of special ceramic preparation technology. Using two or three kinds of commercial high-purity 5N (99.999%) a-Al 2 O 3 powder produced by the aluminum alcohol method as the starting material, the optimal particle size of each powder is determined by theoretical model calculation and experimental correction. The relationship between the size ratio and the proportion of the proportion, and the mixed powder is pressed into a block material through the cold isostatic pressing process, and then sintered at a high temperature to prepare a-Al with a density greater than 3.6g/cm 3 (relative density greater than 90%) 2 O 3 polycrystalline block. In the prepared a-Al 2 O 3 polycrystalline bulk material, the small particle size powder will fill the gaps between the large size particles, and the contact between the powder materials is more, and the interaction is greater, so in the process of pressing and high temperature sintering It is not easy to crack in the middle, and it is easy to obtain large-sized products, and its firing density is higher than that of commercially available alumina cakes.

Description

A kind of preparation method of aluminum oxide polycrystal material piece
Technical field
The present invention relates to a kind of preparation method of aluminum oxide polycrystal material piece, belong to special cermacis fabricating technology field.
Background technology
White light emitting diode (LED) is since realizing commercialization, and is pollution-free with it, volume is little, low in energy consumption and reliability advantages of higher, is just starting the another field lighting source revolution continue incandescent light, luminescent lamp after on the illumination history.1991, the appearance of the basic blue-ray LED of gan (GaN) was opened up new way for realization LED white-light illuminating again.According to the principle of three primary colours, with blue light that GaN sent out with can be by blue-light excited and the fluorescent material emission gold-tinted makes up, both stacks can form white light, thereby realize white-light illuminating.Therefore GaN base LED has also obtained developing rapidly, becomes the light-emitting semiconducting material that is most widely used.
At present, GaN sill and the device for LED mainly is to obtain in the mode that substrate grows epitaxial film by thin-film technique.Its used substrate material comprises sapphire (α-Al 2O 3), SiC, Si, ZnO and GaN etc., but have only sapphire and these two kinds of substrates of SiC to obtain fairly large commercial applications up to now, wherein being most widely used with Sapphire Substrate again.This is because sapphire has many advantages as substrate material: manufacturing technology is ripe relatively, moderate cost; The chemical stability height can be used in the high temperature epitaxy process of growth; The physical strength height is easy to handle and clean, and is good to the light transmission of visible light.Therefore, most of thin film epitaxial growth technologies generally all with sapphire as substrate.
For being used for the epitaxially grown substrate level sapphire crystal of GaN, usually with the basic raw material of high purity aluminium oxide biscuit (its purity generally will reach the 5N level, namely 99.999%) as growing sapphire.Why directly do not adopt powder raw material, the one, because fluffy powder is too low to the filling ratio of the used crucible of growing sapphire monocrystalline, single furnace output is little, influences production efficiency and cost; The 2nd, powder raw material easily flies upward, and is unfavorable to the high vacuum system of single crystal growing furnace.Therefore before growing sapphire crystal, need earlier alumina powder to be suppressed and sintered into block material.Along with LED illumination becomes the energy-conservation project that various countries advocate energetically and give special assistance to, also grow at top speed as the demand of the sapphire single-crystal of its upstream.Sapphire growth constantly strides forward towards the large size direction, and single crystal specification is from initial 20kg, 30kg, to 60kg, 80kg and even the above super large crystal development of 100kg.Under this overall background, each sapphire manufacturer is more strong to the demand of high density aluminum oxide biscuit.Because the density of used aluminum oxide biscuit is more big, just mean the peak filling rate more big (being to insert more raw materials in the unidimensional crucible) to crucible, under the condition that does not change the original configuration of single crystal growing furnace, just can grow single bigger crystal, corresponding production efficiency is higher, cost is lower, size and the yield rate of one-piece substrate have also been increased simultaneously, thereby in future market competition, obtain price advantage, take the good opportunity.
Yet homemade aluminum oxide polycrystal cake piece material normally adopts steel die to make in dry-pressing formed mode now, and burning till density, not high (density is 3.2 ~ 3.6 g/cm 3, have only a-Al 2O 380% ~ 90% of theoretical density is usually about 85%).Adopt the a-Al of such density 2O 3The polycrystalline cake piece material sapphire single-crystal of growing only has about 60% a peak filling rate of crucible, and usage ratio of equipment is obviously not enough, makes production cost improve.In addition, such biscuit also exists such as overall dimension and limit by mould, and pressing process is easily introduced secondary pollution problems such as (main from the Fe in the mould, Cr element), and product purity does not generally all reach 5N, and finally influences the quality of sapphire crystal.On the other hand, used a-Al in the biscuit moulding process 2O 3The size of powder also affects density and the formability of aluminum oxide biscuit.With present both at home and abroad preparation 5N grade aluminum oxide powder main stream approach---alkoxide hydrolysis is example, though the powder purity that makes with this method can reach 99.999%, can satisfy the long brilliant requirement of high quality substrate level sapphire fully, but the aluminium alcoholates method is by Al (OH) at last 3Change a-Al into through high-temperature calcination 2O 3, the a-Al of gained 2O 3Powder granule is big (micron order), and the intergranular space is many, is difficult for tamping mould, and the biscuit density after the moulding is little.And because bonding force is little between its particle, in the condition compacted under difficulty of adding additives not, green strength is low, and is easily cracked, especially is difficult to obtain large-sized product.If be processed into thinner powder, then when increasing production cost, also will face powder a series of problems such as contaminated in the course of processing, and finally influence quality and the density of cake piece material.
In sum, for improving the quality of aluminum oxide cake piece material density and assurance product, the particle diameter of used alumina powder is selected, and it is imperative to improve existing biscuit moulding process.
Summary of the invention
Defective at the prior art existence, the object of the present invention is to provide a kind of preparation method of aluminum oxide polycrystal material piece, can improve existing aluminum oxide cake piece material density, to improve sapphire production efficiency, reduce production costs, avoid in the biscuit production process, taking place problems such as material powder secondary pollution, biscuit blank cracking simultaneously.
The present invention conceives as follows:
For obtaining above-mentioned a-Al 2O 3Polycrystalline piece material is at first by calculating the shared quantitative proportion relation when of determining size between used powder raw material particle.Elder generation as the main body particle, regards this powder as diameter for the spheroid of its median size and simple cube of work, body-centered cubic or face-centered cubic close-packed with a kind of powder with greater particle size during calculating, draws the voidage of existence; Calculate overall dimension and the relative populations (as shown in Figure 1-Figure 3) of inserting the required another kind of or two kinds of calking powders (also representing with spheroid) in this Mi Dui space again.Consider that this model is the theoretical closest packing situation under the perfect condition, actually operating medium silt mode is fully like this arranged, and any powder itself all has certain particle and distributes, and therefore according to experiment gained result the above-mentioned theory value has been carried out certain correction.
For achieving the above object, according to above inventive concept, the present invention adopts following technical scheme:
A kind of preparation method of aluminum oxide polycrystal material piece has following technological process and step:
A. with two or three 99.999% the commercial high-purity a-Al that uses that the aluminium alcoholates method produces 2O 3Powder is starting raw material, and when adopting two kinds of particle diameter powder proportionings, main body particle powder is 1:0.1 ~ 1:0.2 with the ratio of the median size of calking particle powder, and mass ratio is between 1:0.08 ~ 1:0.15; When adopting three kinds of particle diameter powder proportionings, the ratio of the median size of three kinds of particle powders is 1:(0.6 ~ 0.7): (0.2 ~ 0.25), weight ratio are 1:(0.3 ~ 0.4): (0.05 ~ 0.06);
B. the powder with above-mentioned different-grain diameter successively alternately is packed in the rubber tubbiness mould of homemade different diameter size, and rubber mold places on the shaking table in reinforced process all the time, and applies the vibration that the vertical direction frequency is 500 ~ 1000 Hz;
C. the rubber mold after will loading is placed in the cold isostatic press through sealing, and pressurize is 1 ~ 5 minute under 100 ~ 200 MPa pressure, makes cylindric biscuit after the demoulding;
D. cylindric biscuit is carried out sintering under air or nitrogen or vacuum environment, sintering range is 1550 ~ 1750 ℃, and sintering time is 3 ~ 5 hours; The final relative density that obtains is greater than 90%, and density is greater than 3.6 g/cm 3A-Al 2O 3Polycrystalline piece material.
Compared with prior art, the present invention has following outstanding substantive distinguishing features and progressive significantly:
The present invention proposes the a-Al with two or three granularity 2O 3Particle mixes and realizes the closeizationest accumulation by certain proportioning of optimizing, again in conjunction with cold isostatic compaction prepared high-density a-Al 2O 3The method of polycrystalline piece material.At the a-Al that adopts aforesaid method to make 2O 3In the polycrystalline piece material, the small particle size powder can be filled up the space between the large-size particle, contact is more between powder, it is bigger to interact, thereby in compression moulding and high-temperature sintering process, be difficult for chipping, be easy to obtain large-sized product, and its to burn till the relative commercial alumina cake of density piece material higher.Adopt isostatic cool pressing technology that above-mentioned mixed powder is pressed into block material, equipment used is cold isostatic press, and mould is rubber mold, a-Al 2O 3The polycrystal piece in whole preparation production process not with any metallic contact, avoid the generation of secondary pollution.
Description of drawings
Fig. 1 is the multistage granularity particle of simple cubic close-packed model.
Fig. 2 is the multistage granularity particle of face-centered cubic close-packed model.
Fig. 3 is the multistage granularity particle of body-centered cubic close-packed model.
Embodiment
After now specific embodiments of the invention being described in.
Embodiment 1
Process and the step of present embodiment are described below:
1. adopt the commercial high-purity 5N(99.999% of aluminium alcoholates method of two kinds of different-grain diameters) a-Al 2O 3Powder is raw material, and the ratio of median size is got 1:0.15, and weight ratio is got 1:0.1.Be specially the big particle diameter powder of 50 μ m and get 2400 g, 7.5 μ m small particle size powders are got 240 g, gross weight 2640 g.The theoretical porosity that calculates according to close heap model is 25.56%.
2. above-mentioned powder is waited quality ground to be divided into 4 parts respectively, successively alternately being packed into homemade diameter is 150 mm, in the rubber tubbiness mould of high 130 mm.Rubber mold places on the shaking table in reinforced process all the time, and applies the vibration that the vertical direction frequency is 500 Hz;
3. the rubber mold after the filling is placed in the isostatic pressing machine through sealing, and pressurize is 3 minutes under 200 MPa pressure, makes cylindric biscuit after the demoulding;
4. cylindric biscuit carries out sintering under air ambient, and sintering temperature is 1650 ℃, and sintering time is 5 hours.Final acquisition diameter is 113 mm, high 72 mm, and density is 3.67 g/cm 3A-Al 2O 3Polycrystalline piece material.The sample good moldability, the surface does not have cracking, and relative density is 92%.
Embodiment 2
The purity of the used powder raw material of present embodiment, a-Al 2O 3Identical among polycrystalline piece material drawing method and step and the embodiment 1.Difference has been to adopt the aluminium alcoholates method a-Al of three kinds of different-grain diameters 2O 3Powder is raw material, and median size is respectively 10 μ m, 7 μ m and 3 μ m(are that three's particle diameter ratio is 1:0.7:0.3), weight gets 1800 g, 720 g respectively and 108 g(are that three's weight ratio is 1:0.4:0.06), the total gross weight is 2628g.The theoretical porosity that calculates according to close heap model is 24.08%.
After tested, with method and step described in this embodiment, finally obtaining diameter is 114 mm, high 70 mm, and density is 3.69 g/cm 3A-Al 2O 3Polycrystalline piece material.The sample good moldability, the surface does not have cracking, and relative density reaches 93%.

Claims (1)

1. 一种氧化铝多晶料块的制备方法,其特征在于,具有以下的工艺过程和步骤: 1. A preparation method of aluminum oxide polycrystalline material block, is characterized in that, has following technological process and step: a. 以两种或三种使用醇铝法生产的99.999%的商业高纯a-Al2O3粉料为起始原料,当采用两种粒径粉料配比时,主体颗粒粉料与填隙颗粒粉料的平均粒径之比为1:0.1~1:0.2,质量比在1:0.08 ~1:0.15之间;当采用三种粒径粉料配比时,三种颗粒粉料的平均粒径之比为1:(0.6~0.7):(0.2~0.25),重量比为1:(0.3~0.4):(0.05~0.06); a. With two or three kinds of 99.999% commercial high-purity a-Al 2 O 3 powders produced by the aluminum alcohol method as starting materials, when two kinds of particle size powders are used in proportion, the main particle powder and The average particle size ratio of interstitial particle powder is 1:0.1~1:0.2, and the mass ratio is between 1:0.08~1:0.15; The average particle size ratio is 1: (0.6~0.7): (0.2~0.25), and the weight ratio is 1: (0.3~0.4): (0.05~0.06);  b. 将上述不同粒径的粉料逐层交替地装填入自制的不同直径大小的橡胶桶状模具内,橡胶模具在加料过程中始终置于振动台上,并施加竖直方向频率为500~1000 Hz的振动; b. Alternately fill the above-mentioned powders with different particle sizes into self-made rubber bucket molds with different diameters. The rubber molds are always placed on the vibrating table during the feeding process, and the vertical frequency is 500 Vibration at ~1000 Hz; c. 将装填后的橡胶模具经密封后置于冷等静压机中,在100~200 MPa压力下保压1~5分钟,经脱模后制成圆柱状素坯; c. Place the filled rubber mold in a cold isostatic press after being sealed, hold the pressure for 1-5 minutes under a pressure of 100-200 MPa, and make a cylindrical green body after demoulding; d. 将圆柱状素坯在空气或氮气或真空环境下进行烧结,烧结温度范围为1550~1750℃,烧结时间为3~5小时;最终获得相对密度大于90%,密度大于3.6 g/cm3的a-Al2O3多晶块料。 d. Sinter the cylindrical green body in air, nitrogen or vacuum environment, the sintering temperature range is 1550~1750°C, and the sintering time is 3~5 hours; the final relative density is greater than 90%, and the density is greater than 3.6 g/cm 3 a-Al 2 O 3 polycrystalline bulk.
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Cited By (9)

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Publication number Priority date Publication date Assignee Title
CN105347776A (en) * 2015-10-13 2016-02-24 刘冠华 Preparation method for high-purity high-density alumina bar material
CN107190310A (en) * 2016-03-15 2017-09-22 李刚 A kind of monocrystalline combination raw materials moulding process design of high loading density
CN107633147A (en) * 2017-10-09 2018-01-26 湘潭大学 It is a kind of based on particle contact it is powder sintered into neck process discrete element modeling method
CN108585800A (en) * 2018-06-01 2018-09-28 宁波泰科先进陶瓷有限公司 A kind of synthetic fiber spinning alumina composite ceramic filar guide and preparation method thereof
CN109249030A (en) * 2018-09-06 2019-01-22 晋城鸿刃科技有限公司 The preparation method of tungsten-cobalt series hard alloy
CN112470044A (en) * 2018-07-31 2021-03-09 日本特殊陶业株式会社 Optical wavelength conversion member and light emitting device
CN112609241A (en) * 2020-12-11 2021-04-06 江苏协鑫硅材料科技发展有限公司 Silicon raw material for silicon crystal growth, and preparation method and application thereof
CN114702307A (en) * 2022-01-14 2022-07-05 洛阳索莱特材料科技有限公司 Preparation method of compact alumina ceramic product
CN116081661A (en) * 2021-10-25 2023-05-09 新疆众和股份有限公司 Improved method for preparing alumina by using aluminum alkoxide method for filler

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105347776A (en) * 2015-10-13 2016-02-24 刘冠华 Preparation method for high-purity high-density alumina bar material
CN107190310A (en) * 2016-03-15 2017-09-22 李刚 A kind of monocrystalline combination raw materials moulding process design of high loading density
CN107633147A (en) * 2017-10-09 2018-01-26 湘潭大学 It is a kind of based on particle contact it is powder sintered into neck process discrete element modeling method
CN108585800A (en) * 2018-06-01 2018-09-28 宁波泰科先进陶瓷有限公司 A kind of synthetic fiber spinning alumina composite ceramic filar guide and preparation method thereof
CN112470044A (en) * 2018-07-31 2021-03-09 日本特殊陶业株式会社 Optical wavelength conversion member and light emitting device
CN112470044B (en) * 2018-07-31 2023-01-13 日本特殊陶业株式会社 Optical wavelength conversion member and light emitting device
CN109249030A (en) * 2018-09-06 2019-01-22 晋城鸿刃科技有限公司 The preparation method of tungsten-cobalt series hard alloy
CN112609241A (en) * 2020-12-11 2021-04-06 江苏协鑫硅材料科技发展有限公司 Silicon raw material for silicon crystal growth, and preparation method and application thereof
CN112609241B (en) * 2020-12-11 2022-08-09 江苏协鑫硅材料科技发展有限公司 Silicon raw material for silicon crystal growth, and preparation method and application thereof
CN116081661A (en) * 2021-10-25 2023-05-09 新疆众和股份有限公司 Improved method for preparing alumina by using aluminum alkoxide method for filler
CN116081661B (en) * 2021-10-25 2025-02-14 新疆众和股份有限公司 An improved method for preparing alumina using an alcohol aluminum process as a filler
CN114702307A (en) * 2022-01-14 2022-07-05 洛阳索莱特材料科技有限公司 Preparation method of compact alumina ceramic product

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Application publication date: 20130807