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Alpha-aluminium oxide powder for low glass powder

A technology of alumina powder and glass powder, applied in the field of alumina powder, to achieve the effect of improving crystallinity and sphericity, low cost, and realizing mass automatic production

Inactive Publication Date: 2005-03-02
马淑云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no low-cost, mass-produced α-alumina powder for low glass powder in China

Method used

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Embodiment 1

[0043] The α-alumina powder for low glass powder of the present invention comprises a mixture of the following raw material proportions (weight percent), prepared according to the following method:

[0044] a. Proportion:

[0045] Al for primary industrial use 2 o 3 : 90%, particle size 200 mesh;

[0046] High Whiteness Superfine Al(OH) 3 : 8%, whiteness Y > 95%, particle size: 1000 mesh;

[0047] AlF 3 : 0.5%, particle size 200 mesh; NH 4 F: 0.5%, particle size 200 mesh;

[0048] BaF 2 : 1%, particle size 200 mesh;

[0049] b. Preparation method:

[0050] In the first step, the above-mentioned raw materials are mixed evenly and then placed in a tunnel kiln for calcination at a calcination temperature of 1550-1650°C and kept for 6-10 hours;

[0051] In the second step, after the product obtained in the first step is selected and classified, it is first crushed and ground in a ball mill, and then ground in a stirring mill;

[0052] In the third step, the product obta...

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Abstract

The alpha-alumina powder specially for low glass powder is prepared with industrial alumina of granularity 200-250 mesh 90-95 wt%, high whiteness superfine aluminum hydroxide of whiteness Y higher than 95 % and granularity higher than 1000 mesh 3-8 wt%, AlF3 of granularity 200-250 mesh 0.5-2 wt%, NH4F of granularity 200-250 mesh 0.5-2 wt% and BaF2 of granularity 200-250 mesh 0.3-1 wt%, and through mixing; calcining in tunnel kiln the mixture at 1550-1650 deg.c via maintaining the temperature for 6-10 hr; sorting to grade, grinding in ball mill, grinding in stirring mill; grading in hydraulic vortex grading machine, surface treating in HCl solution and stoving. The present invention has the advantages of low cost and mass production.

Description

technical field [0001] The present invention relates to alumina powder, in particular to α-alumina powder for low glass powder. Background technique [0002] α-Al for frit glass powder in color TV industry 2 o 3 It is a necessary raw material for flat cone sealing of picture tubes. Due to the particularity of picture tube products, α-Al is required 2 o 3 The powder must have properties such as high insulation, high withstand voltage, high heat resistance, low specific surface area, and low thermal expansion coefficient. However, most of the α-alumina powders used in the domestic color TV industry are imported from Japan. The cost is very high, generally 180,000-190,000 yuan / ton. There is no low-cost, mass-produced α-alumina powder for low glass powder in China. Contents of the invention [0003] The object of the present invention is to provide a kind of α-alumina powder for low glass powder with low manufacturing cost and superior performance in mass production. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30C03C8/24
Inventor 马淑云
Owner 马淑云
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