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Process or preparing microcrystal wear-resisting alumina ceramic

A technology of alumina ceramics and alumina powder, which is applied in the field of ceramic technology, can solve the problems affecting the performance of ceramic products, large original particle size of raw materials, and decreased sintering activity, and achieve uniform moisture, uniform flow, and precise particle distribution control Effect

Inactive Publication Date: 2011-11-16
JINGANG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, my country's Al 2 o 3 Due to the limitations of the powder preparation process level of ceramic particles, the original particle size of the raw material is large, and the agglomeration phenomenon is serious, resulting in a decrease in sintering activity, which directly affects the performance of the final ceramic product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] (1) 12000Kg of fine alumina powder, 1000Kg of kaolin, 67Kg of barium carbonate and 67Kg of magnesium oxide, 135Kg of dolomite, 200Kg of burnt talc, 25Kg of green body reinforcing powder, composite additives: polyvinyl alcohol 34Kg, sodium tripolyphosphate 50Kg, Germany 9300 doses of 35Kg produced by Sima Company, the powder is added into a ball mill, and ball milled until the particle size of the ball mill is 1.8 μm; (2) Use a laser force analyzer to detect the fineness of the slurry, and the particle size of the slurry is measured D50<1.8 μm, and the moisture content is 40% , when the time through the flowmeter is 20 seconds, put the qualified slurry into the slurry tank; (3) absorb the slurry in the slurry tank and enter it into the spray drying tower through the servo system for drying and granulation; (4) use 40 mesh, 60 mesh, 100 mesh, 120 mesh, and 140 mesh sieves are sieved once, and the particles are graded, put into the stale warehouse for homogenization; (5) pr...

Embodiment 2

[0009] (1) 12000Kg of fine alumina powder, 1000Kg of kaolin, 67Kg of barium carbonate and 67Kg of magnesium oxide, 135Kg of dolomite, 200Kg of burnt talc, 25Kg of green body reinforcing powder, composite additives: polyvinyl alcohol 34Kg, sodium tripolyphosphate 50Kg, Germany 9300 doses of 35Kg produced by Sima Company, the powder is added into a ball mill, and ball milled until the particle size of the ball mill is 1.8 μm; (2) the fineness of the slurry is detected by a laser force analyzer, and the particle size of the slurry is measured D50<1.8 μm, and the moisture content is 42% , when the time through the flow meter is 23 seconds, put the qualified slurry into the slurry tank; (3) absorb the slurry in the slurry tank and enter it into the spray drying tower through the servo system for drying and granulation; (4) use 40 mesh, 60 mesh, 100 mesh, 120 mesh, and 140 mesh sieves are sieved once, and the particles are graded, put into the stale warehouse for homogenization; (5) ...

Embodiment 3

[0011] (1) 12000Kg of fine alumina powder, 1000Kg of kaolin, 67Kg of barium carbonate and 67Kg of magnesium oxide, 135Kg of dolomite, 200Kg of burnt talc, 25Kg of green body reinforcing powder, composite additives: polyvinyl alcohol 34Kg, sodium tripolyphosphate 50Kg, Germany 9300 doses of 35Kg produced by Sima Company, the powder is added into a ball mill, and ball milled until the particle size of the ball mill is 1.8 μm; (2) the fineness of the slurry is detected by a laser strength analyzer, and the particle size of the slurry is measured D50<1.8 μm, and the moisture content is 44% , when the time through the flowmeter is 25 seconds, put the qualified slurry into the slurry tank; (3) absorb the slurry in the slurry tank and enter it into the spray drying tower through the servo system for drying and granulation; (4) use 40 mesh, 60 mesh, 100 mesh, 120 mesh, and 140 mesh sieves are sieved once, and the particles are graded, put into the stale warehouse for homogenization; (5...

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Abstract

The invention belongs to the field of ceramic processes, and in particular relates to a process for preparing a microcrystal wear-resisting alumina ceramic. The process comprises the following steps: ball-milling raw materials into small particles of 1.8 micrometers; detecting the particle size of slurry; drying and milling the slurry, and then grading the particles; performing pressure forming on blanks; and finally sintering the ceramics. The process has the following advantages: in the process of milling, a servo system is used when conveying the materials from a stock tank to a spray drying tower to ensure that the flowing slurry is even and the moisture in the prepared powder is even; and the adoption of mesh screens with different diameters to perform particle gradation is more reasonable and the particle distribution is controlled precisely.

Description

technical field [0001] The invention belongs to the technical field of ceramics, in particular to a process for preparing microcrystalline wear-resistant alumina ceramics. Background technique [0002] Alumina ceramics are the most detailed and widely used ceramics in modern ceramics, with a density of 3.98g / cm 3 , the molecular weight of stoichiometric alumina is 101.96, and the most commonly used crystal type is α-Al with corundum structure 2 o 3 It belongs to the R3c space group, and each cell is composed of 10 molecules. The aluminum ions occupy two-thirds of the octahedral gaps by making the oxygen atoms close-packed approximately hexagonally. Al 2 o 3 Ceramics are stable due to their own performance, especially high temperature performance and chemical performance, and the production process of craft products is relatively simple, low cost and widely used. Especially in the powder or fluid delivery system of thermal power, steel, smelting, mining and other indust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/117C04B35/622
Inventor 赵友谊崔洪于冬镇
Owner JINGANG NEW MATERIALS
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