A kind of preparation method of aluminum oxide granulation powder special for hot-pressed water valve sheet

A technology of alumina powder and alumina, which is applied in the field of preparation of alumina granulation powder for hot-pressed water valves, can solve the problems of inconsistent wax content in semi-finished products, uneven dry grinding of powder fineness, and low efficiency of ball milling. Achieve the effects of solving precipitation and uneven mixing, particle shape correction, and wide firing temperature

Active Publication Date: 2016-06-29
JINGANG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wet grinding spray granulation powder often contains hollow particles, which leave pores in the product after firing and are prone to blackening after polishing (polishing machine pollutants enter the product pores, and ultrasonic waves cannot be cleaned); in addition, wet grinding spray granulation powder The particle distribution range is wide. When mixing wax, large particles are easy to sink, resulting in inconsistent wax content in semi-finished products and affecting product performance.
The granulated powder produced by dry grinding does not have hollow particles, and the problem of blackening of polishing will be greatly reduced, but the ball milling efficiency produced by dry grinding is low, the production cost is high and the working environment is poor; in addition, the dry grinding process is difficult to control Fineness gradation, uneven dry grinding of powder fineness will easily lead to inconsistent product shrinkage, low product precision, and poor sealing; it will also lead to local delamination in the wax mixing process

Method used

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  • A kind of preparation method of aluminum oxide granulation powder special for hot-pressed water valve sheet
  • A kind of preparation method of aluminum oxide granulation powder special for hot-pressed water valve sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Raw materials and parts by weight

[0045] Main ingredients: 91.5 parts of alumina powder, 3.6 parts of calcined kaolin;

[0046] Composite sintering aid: 1.5 parts of magnesium oxide, 1.2 parts of calcium carbonate, 1 part of silicon micropowder, 1.2% of titanium dioxide;

[0047](2) Put the alumina powder, calcined kaolin and composite sintering aid into the batch ball mill for controlled crystal ball milling (using alumina balls as the grinding medium, material: ball: water = 1: 2.6: 1) The gradation size ratio of the alumina ball stone is: φ20 accounts for 20%, φ25 accounts for 25%, φ30 accounts for 5%, φ35 accounts for 5%, φ40 accounts for 25%, φ45 accounts for 20%), after ball milling to the specified time, Detect the slurry moisture, fineness and fineness gradation. The overall size is 3000*4500mm, the rotation speed is 13r / min, the ball milling time is 15 hours, the slurry fineness D90<10μm, and the slurry moisture is controlled at about 33%.

[0048] (3) ...

Embodiment 2

[0053] (1) Raw materials and parts by weight

[0054] Main ingredients: 90 parts of alumina powder, 3.6 parts of calcined kaolin;

[0055] Composite sintering aid: 2 parts of magnesium oxide, 2.2 parts of calcium carbonate, 1 part of silicon micropowder, 1.2% of titanium dioxide;

[0056] (2) Put the alumina powder, calcined kaolin and composite sintering aid into the batch ball mill for controlled crystal ball milling (using alumina balls as the grinding medium, material: ball: water = 1: 2.6: 1) The gradation size ratio of the alumina ball stone is: φ20 accounts for 20%, φ25 accounts for 25%, φ30 accounts for 5%, φ35 accounts for 5%, φ40 accounts for 25%, φ45 accounts for 20%), after ball milling to the specified time, Detect the slurry moisture, fineness and fineness gradation. The overall size is 3000*4500mm, the rotation speed is 13r / min, the ball milling time is 25 hours, the slurry fineness D90<8μm, and the slurry moisture is controlled at about 33.5%.

[0057] (3) Ad...

Embodiment 3

[0062] (1) Raw materials and parts by weight

[0063] Main ingredients: 89 parts of alumina powder, 6 parts of calcined kaolin;

[0064] Composite sintering aids: 1.3 parts of magnesium oxide, 1.3 parts of calcium carbonate, 1.2 parts of silicon micropowder, 1.2% of titanium dioxide;

[0065] (2) Put the alumina powder, calcined kaolin and composite sintering aid into the batch ball mill for controlled crystal ball milling (using alumina ball stone as the grinding medium, material: ball: water = 1: 2.2: 1) The gradation size ratio of the alumina ball stone is: φ20 accounts for 20%, φ25 accounts for 25%, φ30 accounts for 5%, φ35 accounts for 5%, φ40 accounts for 25%, φ45 accounts for 20%), after ball milling to the specified time, Detect the slurry moisture, fineness and fineness gradation. The overall size is 3000*4500mm, the rotation speed is 13r / min, the ball milling time is 23 hours, the slurry fineness D90<6μm, and the slurry moisture is controlled at about 40%.

[0066]...

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Abstract

The invention discloses a preparation method of aluminum oxide granulation powder specially used for hot-pressed water valve sheets, and belongs to the technical field of new materials. This method uses optimized special alumina powder as the main raw material, and uses a unique ball milling process to control the particle size gradation of the mud; using compound additives to modify the surface of the granulated powder to achieve wet spraying, the granular granulated powder can reach a similar level during use. The effect of dry grinding granulated powder (micro powder). The prepared alumina granulated powder is suitable for hot die-casting equipment of various manufacturers in the market, and the fired products have high precision, no deformation and good polishing effect.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a method for preparing alumina granulation powder special for hot-pressed water valve sheets. Background technique [0002] The water disc is the sealing gasket in the faucet. At present, it is mainly made of alumina. It is formed by hot die-casting with alumina powder and wax and then sintered. At present, there is no manufacturer to produce alumina granulated powder specially used for hot die-casting water valves. [0003] The alumina granulated powder used for hot die casting mainly has two process routes: wet milling spray drying and dry milling direct milling. Both methods of granulated powder have their own advantages and disadvantages. Wet grinding spray granulation powder often contains hollow particles, which leave pores in the product after firing and are prone to blackening after polishing (polishing machine pollutants enter the product pores, and ultrasonic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/626
Inventor 李昕赵友谊王瑞生王琦王晋槐
Owner JINGANG NEW MATERIALS
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