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A kind of porous ceramics for air bearing and its preparation method and application

A technology of porous ceramics and composite ceramics, applied in the field of porous ceramic materials, can solve the problems of low hardness of porous stainless steel, reduce the permeability of porous materials, affect the performance of air bearings, etc., achieve high porosity and reduce the amount of grinding debris , excellent mechanical properties

Active Publication Date: 2022-06-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The permeability of porous materials is the main factor determining the performance of air bearings, but because of the low hardness of bronze and stainless steel, grinding debris will be generated by machining methods, which will block the pores on the surface of porous materials and reduce the permeability of porous materials. Thus affecting the performance of the air bearing
On the other hand, the hardness of porous bronze and porous stainless steel is low, so the air bearing is easy to wear during operation and has a short service life

Method used

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  • A kind of porous ceramics for air bearing and its preparation method and application

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Experimental program
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Embodiment 1

[0025] A preparation method of porous ceramics, the method comprising the steps of:

[0026] In parts by weight, prepare 60 parts of alumina composite ceramic powder, 45 parts of binder and 5 parts of pore-forming agent. The median particle size of the alumina composite ceramic powder is 3-12 μm. The median particle size of the binder is 1-2 μm, and the median particle size of the pore-forming agent is 10-30 μm. Wherein the alumina composite ceramic powder comprises 80% alumina, 15% zirconia, 3% silicon carbide and 2% silica by weight percentage, and the binder comprises a mass ratio of 3.2: 0.8:0.3 of alumina, magnesia and titania, and the pore-forming agent is ammonium bicarbonate.

[0027] The above powder is ball-milled according to the mass ratio of material: ball: medium absolute ethanol as 1.5:1:1.5, the ball mill used is a planetary ball mill, and the ball milling speed is 200r / min. Then, the ball-milled slurry is taken out and dispersed in an ethanol solvent with a ...

Embodiment 2

[0031] A preparation method of porous ceramics, the method comprising the steps of:

[0032] In parts by weight, prepare 70 parts of alumina composite ceramic powder, 40 parts of binder and 8 parts of pore-forming agent, the median particle size of the alumina composite ceramic powder is 3-12 μm, and the The median particle size of the binder is 1-2 μm, and the median particle size of the pore-forming agent is 10-30 μm. Wherein, the alumina composite ceramic powder comprises 90% alumina, 5% zirconia, 4% silicon carbide and 1% silica by weight percentage, and the binder comprises a mass ratio of 3.5: 0.5:0.5 of alumina, magnesia and titania, and the pore-forming agent is polystyrene microspheres.

[0033] The above powder is ball-milled according to the mass ratio of material: ball: medium deionized water as 1.2:1:2.5, the ball mill used is a planetary ball mill, and the ball milling speed is 230r / min. Then, the ball-milled slurry is taken out and dispersed in methanol solven...

Embodiment 3

[0037] A preparation method of porous ceramics, the method comprising the steps of:

[0038] In parts by weight, prepare 80 parts of alumina composite ceramic powder, 55 parts of binder and 10 parts of pore-forming agent, the median particle size of the alumina composite ceramic powder is 3-12 μm, and the The median particle size of the binder is 1-2 μm, and the median particle size of the pore-forming agent is 10-30 μm. Wherein, the alumina composite ceramic powder includes 75% alumina, 20% zirconia, 3% silicon carbide and 2% silica by weight percentage, and the binder includes a mass ratio of 3.5: 0.5:0.3 of alumina, magnesia and titania, the pore-forming agent is a mixture of graphite powder and carbon powder in a weight ratio of 1:1.

[0039] The above powder is ball-milled according to the mass ratio of material: ball: medium acetone of 1.5: 1: 2, the ball mill used is a planetary ball mill, and the ball milling speed is 250 r / min. Then, the ball-milled slurry is taken ...

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Abstract

The invention discloses a porous ceramic for an air bearing, a preparation method and application thereof, and belongs to the technical field of porous ceramic materials. The method comprises the following steps: in parts by weight, after ball milling 60-80 parts of alumina composite ceramic powder, 40-55 parts of binder and 5-10 parts of pore-forming agent, they are dispersed in a solvent and mixed Uniformly obtain ceramic slurry, the alumina composite ceramic powder includes 75%~90% alumina, 5%~20% zirconia, 2%~5% silicon carbide and 1%~2 % silicon dioxide; the slurry is dried and then pressed to form a green body; the green body is sintered to obtain porous ceramics. The porous ceramic prepared by the invention has the advantages of high porosity, high permeability, excellent mechanical properties and long service life, and has good application in air bearings.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic materials, and in particular relates to a porous ceramic for an air bearing and a preparation method and application thereof. Background technique [0002] Bearings are an indispensable basic part of all kinds of mechanical equipment in today's era, and their performance directly affects and determines the performance of mechanical equipment. Air bearing is also called gas bearing. Plain bearings with air as lubricant. During normal operation, the shaft and bearing surfaces are completely separated by an air film, which supports the shaft and external force loads by means of changes in the pressure in the air film. Because air has less viscosity than oil, high temperature resistance and no pollution, air bearing can be used in high-speed machines, instruments and radioactive devices, but its load capacity is relatively low. [0003] Due to the low pressure and compressibility of the gas,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/10C04B35/622F16C32/06
CPCC04B38/0645C04B38/067C04B38/068C04B35/10C04B35/622F16C32/0618C04B2235/6562C04B2235/6567C04B2235/661C04B2235/3217C04B2235/3244C04B2235/3826C04B2235/3418C04B2235/3206C04B2235/3232C04B2235/96F16C2206/44C04B38/0074
Inventor 朱孔军杜建周金栋平石峰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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