Preparation method of microcrystalline wear-resistant alumina ceramic by utilizing rare earth compounds
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A technology of alumina ceramics and compounds, applied in the field of preparing microcrystalline wear-resistant alumina ceramics, can solve the problems of low fracture toughness, less research on high-grade alumina ceramics, low strength of high-grade alumina ceramics, etc. Simple production and wide range of raw materials
Inactive Publication Date: 2013-11-13
GUILIN UNIVERSITY OF TECHNOLOGY
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[0003] At present, the production of alumina ceramics in my country is mainly concentrated in middle and low-grade alumina ceramics, and there is little research on high-grade alumina ceramics, and the prepared high-grade alumina ceramics have low strength and low fracture toughness.
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Embodiment 1
[0019] (1) According to the mass percentage of raw materials is Al 2 o 3 95%, kaolin 1.4%, calcite 1.4%, dolomite 1.4% and Dy 2 o 3 0.8% for batching.
[0020] (2) Mix the materials prepared in step (1) with water, and use agitator ball mill for wet ball milling. The ball milling time is 48 hours, and the average particle size of the powder is 0.2~2μm, wherein the mass ratio of the amount of water added to the raw material is 1 :3.
[0021] (3) The raw material obtained in step (2) was dried at 110°C, formed by isostatic pressing (80MP), and kept under pressure for 10 minutes to obtain a spherical green body.
[0022] (4) Sintering the spherical green body in step (3) in an air atmosphere at a sintering temperature of 1550° C., keeping it warm for 100 minutes, and cooling to room temperature to obtain an alumina ceramic material.
[0023] Test the wear rate of alumina ceramic material to 0.000814%h -1 .
Embodiment 2
[0025] (1) According to the mass percentage of raw materials is Al 2 o 3 95%, kaolin 1.2%, calcite 1.1%, dolomite 1.1% and Dy 2 o 3 1.6% for batching.
[0026] (2) Mix the materials prepared in step (1) with water evenly, use a tubular ball mill for wet ball milling, and the ball milling time is 38 hours to mix evenly, and pulverize until the average particle size of the powder is 0.2~2μm, the amount of water added and the quality of raw materials The ratio is 3:1.
[0027] (3) The raw material obtained in step (2) was dried at 110°C, formed by isostatic pressing (80MP), and kept under pressure for 10 minutes to obtain a spherical green body.
[0028] (4) Place the spherical green body in step (3) in a reducing atmosphere (H 2 ) in sintering, the sintering temperature is 1575°C, the temperature is kept for 100 minutes, and the alumina ceramic material is obtained by cooling to room temperature.
[0029] Test the wear rate of alumina ceramic material to 0.000709%h -1 .
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Abstract
The invention discloses a preparation method of microcrystalline wear-resistant alumina ceramic by utilizing rare earth compounds. The preparation method comprises following steps: (1) mixing following raw materials in percentage by weight: 70 to 99.7% of Al2O3, 0.1 to 10% of rare earth dysprosium compound, 0.05 to 10% of calcium compound or calcium mineral, 0.05 to 10% of magnesium compound or magnesium mineral and 0.1 to 15% of silicon compound or silicon mineral; (2) mixing the mixture with water, subjecting the solution to a wet milling treatment with a stirring mill, or a ball mill, or a tube mill, controlling the milling time in the range of 5 and 96 hours to evenly mix the materials, grinding until the average particle size of the powder is in the range of 0.2 to 2 [mu]m, and controlling the mass ratio of water to raw materials in the range of 1:3 to 3:1; (3) drying the obtained raw materials, preparing the raw materials into green bodies through the isostatic pressing, or roller forming, or axial extruding; (4) sintering the green bodies in the present of air or in the present of reducing atmosphere (CO, H2 or N2), controlling the temperature of 1050 to 1650 DEG C, keeping the temperature for 30 to 300 minutes, and finally cooling to the room temperature so as to obtain the ceramic material. The preparation method has the advantages of wide raw material resources, simple industrial production, and low ware rate of the prepared alumina ceramic.
Description
technical field [0001] The invention discloses a method for preparing microcrystalline wear-resistant alumina ceramics by using rare earth compounds. Background technique [0002] Alumina ceramics has excellent comprehensive properties such as high strength, high temperature resistance, and corrosion resistance. It is an important ceramic material, and alumina ceramics are rich in raw materials and low in price, and are used in many fields. However, alumina ceramics have the problems of low fracture toughness and poor wear resistance, which limit the application of alumina ceramics and also limit the method of preparing high-purity and high-performance alumina ceramics. A lot of research has been done on this issue at home and abroad: Jaroslav Sedlacek and others have studied Al 2 o 3 / SiC composite material wear rate, found that the fracture toughness and wear rate of alumina ceramics were improved after adding a small amount of SiC; Guo Ruisong et al. studied the effect ...
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