Alumina ceramic, preparation method thereof and ceramic bearing

A kind of technology of alumina ceramics and alumina, applied in the field of ceramic materials, can solve the problems of low fracture toughness and difficult slippage

Inactive Publication Date: 2020-06-19
SHENZHEN SUNTECH ADVANCED CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Alumina has high hardness, high wear resistance, and chemical corrosion resistance, but it is difficult for alumina to slip under the condition of external force, so it shows the disadvantage of low fracture toughness

Method used

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  • Alumina ceramic, preparation method thereof and ceramic bearing
  • Alumina ceramic, preparation method thereof and ceramic bearing
  • Alumina ceramic, preparation method thereof and ceramic bearing

Examples

Experimental program
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preparation example Construction

[0023] see figure 1 , the preparation method of alumina ceramics of an embodiment, comprises the steps:

[0024] Step S110: Mix the raw materials to obtain ceramic powder, wherein, in terms of mass percentage, the raw materials include: 35%-99% alumina, 0.5%-60% zirconia and 0.5%-5.0% sintering aid sintering aids, and the particle size of the raw materials is nanoscale, and the sintering aids include magnesium oxide, calcium oxide, sodium oxide, hafnium oxide and potassium oxide.

[0025] By adding zirconia, zirconia is distributed in the alumina matrix. Due to the difference in expansion coefficient between alumina and zirconia, the stress on the zirconia particles is relaxed during sintering and cooling, and the tetragonal phase is transformed into a monoclinic phase. The volume expands, thereby producing microcracks, achieving the effect of toughening alumina and improving the strength of alumina ceramics.

[0026] The above-mentioned sintering aid can effectively inhibit...

Embodiment 1

[0050] The preparation process of the alumina ceramics of the present embodiment is specifically as follows:

[0051] (1) In terms of mass percentage, the following raw materials are weighed: 94.5% Al 2 o 3 , 5.0% ZrO 2 And 0.5% sintering aid, wherein, the sintering aid is 0.1% MgO, 0.1% CaO, 0.1% Na 2 O, 0.1% Hf 2 O and 0.1% K 2 O mixture. Then mix the above-mentioned raw materials with zirconia balls and alcohol in a mass ratio of 1:2:1, and wet-mill in a high-energy ball mill for 48 hours, then dry at 60°C for 24 hours, and pass through a 300-mesh sieve to obtain a ceramic powder .

[0052] (2) The ceramic powder is subjected to cold isostatic pressing, and then dried at 100° C. and debinding at 700° C. to obtain a ceramic green body.

[0053] (3) First sinter the ceramic green body at 1400°C under normal pressure for 2h, and then use nitrogen as the pressurized medium to perform hot isostatic pressing at 1350°C and 100MPa for 1h to obtain alumina ceramics.

Embodiment 2

[0055] The preparation process of the alumina ceramics of the present embodiment is specifically as follows:

[0056] (1) In terms of mass percentage, the following raw materials are weighed: 35% Al 2 o 3 , 60% ZrO 2 And 5.0% sintering aid, wherein, the sintering aid is 1.0% MgO, 1.0% CaO, 1.0% Na 2 O, 1.0% Hf 2 O and 1.0% K 2 O mixture. Then mix the above-mentioned raw materials with zirconia balls and alcohol in a mass ratio of 1:2:1, and wet-mill in a high-energy ball mill for 48 hours, then dry at 60°C for 24 hours, and pass through a 300-mesh sieve to obtain a ceramic powder .

[0057] (2) The ceramic powder is subjected to cold isostatic pressing, and then dried at 100° C. and debinding at 700° C. to obtain a ceramic green body.

[0058] (3) First sinter the ceramic green body at 1400°C under normal pressure for 2h, and then use nitrogen as the pressurized medium to perform hot isostatic pressing at 1350°C and 100MPa for 1h to obtain alumina ceramics.

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Abstract

The invention relates to aluminum oxide ceramic, a preparation method thereof and a ceramic bearing. The preparation method of the aluminum oxide ceramic comprises the following steps: mixing the following raw materials in percentage by mass: 35%-99% of aluminum oxide, 0.5%-60% of zirconium oxide and 0.5%-5.0% of a sintering aid to obtain ceramic powder, wherein the particle sizes of the raw materials are nanoscale, and the sintering aid comprises magnesium oxide, calcium oxide, sodium oxide, hafnium oxide and potassium oxide, molding the ceramic powder to obtain a ceramic green body, carryingout normal pressure sintering on the ceramic green body at 1400-1500 DEG C, and then carrying out hot isostatic pressing sintering at 1300-1350 DEG C under 100-200 MPa to obtain the aluminum oxide ceramic. The preparation method of the aluminum oxide ceramic can be used for breaking the aluminum oxide ceramic with relatively high toughness.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to an alumina ceramic, a preparation method thereof and a ceramic bearing. Background technique [0002] Ceramic bearings are widely used in various types of micro-motor cooling fans, instruments, office equipment, smart homes, household appliances, medical equipment and other fields. Because ceramic bearings have good wear resistance, good chemical corrosion resistance, low density, low thermal expansion coefficient, high elastic modulus, etc., compared with metal and plastic, they have higher service life in high-speed bearings, water-cooled heat dissipation bearings and other fields. . [0003] Alumina has high hardness, high wear resistance, and chemical corrosion resistance, but it is difficult for alumina to slip when an external force is applied, so it shows the disadvantage of low fracture toughness. Contents of the invention [0004] Based on this, it is necessary to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/119C04B35/488C04B35/622C04B35/64F16C17/00F16C19/00
CPCC04B35/119C04B35/4885C04B35/622C04B35/64F16C17/00F16C19/00C04B2235/3206C04B2235/3208C04B2235/3201C04B2235/3244C04B2235/5454C04B2235/5445C04B2235/656C04B2235/6567C04B2235/661C04B2235/785C04B2235/96
Inventor 朱佐祥谭毅成
Owner SHENZHEN SUNTECH ADVANCED CERAMICS
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