CN1272249C - Alpha-aluminium oxide powder for low glass powder - Google Patents
Alpha-aluminium oxide powder for low glass powder Download PDFInfo
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- CN1272249C CN1272249C CN 200410060540 CN200410060540A CN1272249C CN 1272249 C CN1272249 C CN 1272249C CN 200410060540 CN200410060540 CN 200410060540 CN 200410060540 A CN200410060540 A CN 200410060540A CN 1272249 C CN1272249 C CN 1272249C
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Abstract
The present invention discloses alpha-alumina powder used for low glass powder. The alpha-alumina powder is prepared from 90 to 95% of Al2O3 with the particle size of 200 to 250 meshes, 3 to 8% of high whiteness superfine Al (OH) 3 with the whiteness Y larger than 95% and the particle size larger than 1000 meshes, 0.5 to 2% of AlF3 with the particle size of 200 to 250 meshes, 0.5 to 2% of NH4F with the particle size of 200 to 250 meshes, and 0.3 to 1% of BaF2 with the particle size of 200 to 250 meshes. The method for preparing the alpha-alumina powder comprises: firstly, the raw materials are uniformly mixed and then calcined in a tunnel kiln at the calcination temperature of 1550 to 1650 DEG C, and the temperature is kept for 6 to 10 hours; secondly, after selected and graded, products obtained in the first step are crushed and milled in a ball mill and then are milled in a stirring mill; thirdly, after products obtained in the second step are graded by a hydraulic rotational flow type grading machine, the surfaces of the products are treated in HCl solution, and then, the products are dried to obtain finished products. The present invention has the advantages of low realizing cost and domestic mass production of the alpha-alumina powder used for low glass powder.
Description
Technical field
The present invention relates to aluminum oxide powder, especially relate to the low glass powder alpha-aluminium oxide powder.
Background technology
Color TV trade low glass powder (frit glass powder) α-Al
2O
3It is the necessary raw material of picture tube flat awl sealing-in.Because the singularity of picture tube product requires α-Al
2O
3Powder must possess high insulation, high withstand voltage, high heat resistanceheat resistant sex change energy, reach performances such as low specific surface area, low thermal coefficient of expansion, but the employed low glass powder of present domestic color TV trade mostly is Japanese import with alpha-aluminium oxide powder, and its expense is very high, generally ten thousand yuan/ton of 18-19.Domesticly also do not have low cost, produce low glass powder with the producer of alpha-aluminium oxide powder in batch.
Summary of the invention
The purpose of this invention is to provide a kind of cheap for manufacturing cost, low glass powder alpha-aluminium oxide powder of mass-producing superior performance.
For achieving the above object, the present invention can take following technical proposals:
Low glass powder alpha-aluminium oxide powder of the present invention, it comprises the mixture of following proportioning raw materials (weight percent), is prepared from according to following method:
A, proportioning:
The industrial Al of one-level
2O
3: 90-95%, granularity 200-250 order;
The ultra-fine Al of high whiteness (OH)
3: 3-8%, whiteness Y＞95%, granularity＞1000 orders;
AlF
3: 0.5-2%, granularity 200-250 order; NH
4F:0.5-2%, granularity 200-250 order;
BaF
2: 0.3-1%, granularity 200-250 order;
B, preparation method:
The first step mixes above-mentioned raw materials to be placed in the tunnel furnace and calcines, and calcining temperature is 1550-1650 ℃, is incubated 6-10 hour;
Second step after the pick classification, placed broken, the grinding of ball mill with the first step gains earlier, was placed on to stir in the mill and ground;
In the 3rd step, after the classification of hydrocyclone formula grading machine, place HCl solution to carry out surface treatment the second step gains; Drying materials after the surface treatment is got product.
Described proportion of raw materials (weight percent) is:
The industrial Al of one-level
2O
3: 90%, granularity 200 orders;
The ultra-fine Al of high whiteness (OH)
3: 8%, whiteness Y＞95%, granularity: 1000 orders;
AlF
3: 0.5%, granularity 200 orders; NH
4F:0.5%, granularity 200 orders;
BaF
2: 1%, granularity 200 orders.
Described proportion of raw materials (weight percent) also can be:
The industrial Al of one-level
2O
3: 95%, granularity 220 orders;
The ultra-fine Al of high whiteness (OH)
3: 3%, whiteness Y＞95%, granularity＞1100 orders;
AlF
3: 1%, granularity 220 orders; NH
4F:0.7%, granularity 220 orders;
BaF
2: 0.3%, granularity 220 orders.
Described proportion of raw materials (weight percent) also can be:
The industrial Al of one-level
2O
3: 91.3%, granularity 250 orders;
The ultra-fine Al of high whiteness (OH)
3: 4%, whiteness Y＞95%, granularity＞1200 orders;
AlF
3: 2%, granularity 250 orders; NH4
F: 2%, granularity 200-250 order;
BaF
2: 0.7%, granularity 200-250 order.
The invention has the advantages that realization is low-cost, produce the production domesticization of low glass powder with alpha-aluminium oxide powder in batch, qualified low glass powder per ton uses the price of alpha-aluminium oxide powder between ten thousand yuans of 5-6.Concrete advantage mainly shows in the following areas:
1, selects the compounding ingredient of multiple mineralizer, and the production technique of the science of employing, improved the degree of crystallinity and the sphericity of material greatly, overcome traditional mineralizer (H
3BO
3) the crystal structure imperfection, improved feed purity.
2, adopt hydraulic classification technology and two sections grinding technics, guaranteed the use properties of product in solder.
3, adopt process of surface treatment, the material pH value is remained between the 4-6, satisfied the special service requirements of color TV trade.
4, realized automatic production in enormous quantities.Adopt the tunnel furnace calcining process, avoided the non-uniform temperature that exists in intermittent type down-draft kiln and the rotary kiln production process, the deficiency of batch poor stability.
In sum, according to the low glass powder alpha-aluminium oxide powder final product quality height that proportioning of the present invention and explained hereafter go out, specific targets are:
Al
2O
3＞99.8%, α-inversion of phases rate＞98%; SiO
2＜0.04%; Fe
2O
3＜0.02%;
Na
2O＜0.02%; MgO＜0.01%; C＜0.01%; Igloss＜0.01%;
True density＞3.98g/cm
3Former grain fineness number: 8-15 μ m; Mean particle size: 10-12 μ m.
Embodiment
Embodiment 1:
Low glass powder alpha-aluminium oxide powder of the present invention, it comprises the mixture of following proportioning raw materials (weight percent), is prepared from according to following method:
A, proportioning:
The industrial Al of one-level
2O
3: 90%, granularity 200 orders;
The ultra-fine Al of high whiteness (OH)
3: 8%, whiteness Y＞95%, granularity: 1000 orders;
AlF
3: 0.5%, granularity 200 orders; NH
4F:0.5%, granularity 200 orders;
BaF
2: 1%, granularity 200 orders;
B, preparation method:
The first step mixes above-mentioned raw materials to be placed in the tunnel furnace and calcines, and calcining temperature is 1550-1650 ℃, is incubated 6-10 hour;
Second step after the pick classification, placed broken, the grinding of ball mill with the first step gains earlier, was placed on to stir in the mill and ground;
In the 3rd step, after the classification of hydrocyclone formula grading machine, place HCl solution to carry out surface treatment the second step gains; Drying materials after the surface treatment is got product.
Described proportion of raw materials (weight percent) also can be:
The industrial Al of one-level
2O
3: 95%, granularity 220 orders;
The ultra-fine Al of high whiteness (OH)
3: 3%, whiteness Y＞95%, granularity＞1100 orders;
AlF
3: 1%, granularity 220 orders; NH
4F:0.7%, granularity 220 orders;
BaF
2: 0.3%, granularity 220 orders.
Described proportion of raw materials (weight percent) also can be:
The industrial Al of one-level
2O
3: 91.3%, granularity 250 orders;
The ultra-fine Al of high whiteness (OH)
3: 4%, whiteness Y＞95%, granularity＞1200 orders;
AlF
3: 2%, granularity 250 orders; NH
4F:2%, granularity 200-250 order;
BaF
2: 0.7%, granularity 200-250 order.
Claims (4)
1, a kind of low glass powder alpha-aluminium oxide powder is characterized in that: it comprises the proportioning mixture of following raw material weight per-cent, is prepared from according to following method:
A, proportioning:
The industrial Al of one-level
2O
3: 90-95%, granularity 200-250 order;
The ultra-fine Al of high whiteness (OH)
3: 3-8%, whiteness Y＞95%, granularity＞1000 orders;
AlF
3: 0.5-2%, granularity 200-250 order; NH
4F:0.5-2%, granularity 200-250 order;
BaF
2: 0.3-1%, granularity 200-250 order;
B, preparation method:
The first step mixes above-mentioned raw materials to be placed in the tunnel furnace and calcines, and calcining temperature is 1550-1650 ℃, is incubated 6-10 hour;
Second step after the pick classification, placed broken, the grinding of ball mill with the first step gains earlier, was placed on to stir in the mill and ground;
In the 3rd step, after the classification of hydrocyclone formula grading machine, place HCl solution to carry out surface treatment the second step gains; Drying materials after the surface treatment is got product.
2, low glass powder alpha-aluminium oxide powder according to claim 1, it is characterized in that: the proportioning of described raw material weight per-cent is:
The industrial Al of one-level
2O
3: 90%, granularity 200 orders;
The ultra-fine Al of high whiteness (OH)
3: 8%, whiteness Y＞95%, granularity: 1000 orders;
AlF
3: 0.5%, granularity 200 orders; NH
4F:0.5%, granularity 200 orders;
BaF
2: 1%, granularity 200 orders.
3, low glass powder alpha-aluminium oxide powder according to claim 1, it is characterized in that: the proportioning of described raw material weight per-cent is:
The industrial Al of one-level
2O
3: 95%, granularity 220 orders;
The ultra-fine Al of high whiteness (OH)
3: 3%, whiteness Y＞95%, granularity＞1100 orders;
AlF
3: 1%, granularity 220 orders; NH
4F:0.7%, granularity 220 orders;
BaF
2: 0.3%, granularity 220 orders.
4, low glass powder alpha-aluminium oxide powder according to claim 1, it is characterized in that: the proportioning of described raw material weight per-cent is:
The industrial Al of one-level
2O
3: 91.3%, granularity 250 orders;
The ultra-fine Al of high whiteness (OH)
3: 4% whiteness, Y＞95%, granularity＞1200 orders;
AlF
3: 2%, granularity 250 orders; NH
4F:2%, granularity 200-250 order;
BaF
2: 0.7%, granularity 200-250 order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410060540 CN1272249C (en) | 2004-09-27 | 2004-09-27 | Alpha-aluminium oxide powder for low glass powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410060540 CN1272249C (en) | 2004-09-27 | 2004-09-27 | Alpha-aluminium oxide powder for low glass powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1587055A CN1587055A (en) | 2005-03-02 |
| CN1272249C true CN1272249C (en) | 2006-08-30 |
Family
ID=34603482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410060540 Expired - Fee Related CN1272249C (en) | 2004-09-27 | 2004-09-27 | Alpha-aluminium oxide powder for low glass powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1272249C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348494C (en) * | 2005-08-26 | 2007-11-14 | 郑州大学 | High dispersibility alpha-Al2O3 nanometer powder preparation method |
| CN101824279B (en) * | 2010-05-10 | 2013-01-23 | 上海高纳粉体技术有限公司 | High accuracy aluminum oxide polishing powder and production method thereof |
| CN103952084B (en) * | 2014-04-29 | 2016-03-23 | 德米特（苏州）电子环保材料有限公司 | A kind of preparation method of metal-polishing liquid of alumina host |
| CN105255368B (en) * | 2015-10-09 | 2018-02-09 | 同济大学 | A kind of Ultraprecise polished screening technique with micron-submicron polishing fluid |
| CN110723745A (en) * | 2019-11-12 | 2020-01-24 | 河南天马新材料股份有限公司 | Alpha-alumina for electronic ceramic of tape-casting substrate |
-
2004
- 2004-09-27 CN CN 200410060540 patent/CN1272249C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1587055A (en) | 2005-03-02 |
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Granted publication date: 20060830 Termination date: 20100927 |