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Porous ceramic as well as preparation method thereof, air-floating bearing and application

A technology of porous ceramics and green bodies, applied in the field of ceramic materials, can solve the problems of reducing the permeability of porous materials, the hardness of porous stainless steel is small, and the air bearing is easy to be worn, so as to avoid the reduction of porosity, good wear resistance, The effect of reducing the amount of grinding debris

Active Publication Date: 2018-09-14
SHENZHEN SUNTECH ADVANCED CERAMICS
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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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  • Porous ceramic as well as preparation method thereof, air-floating bearing and application
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  • Porous ceramic as well as preparation method thereof, air-floating bearing and application

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preparation example Construction

[0023] Such as figure 1 As shown, a method for preparing a porous ceramic according to an embodiment, the porous ceramic prepared by the method is a silicon carbide porous ceramic. The preparation method of the porous ceramic comprises the following steps:

[0024] Step 110: Mix the raw materials to form a compound.

[0025] Wherein, in terms of mass percentage, the raw materials include: 55% to 70% of silicon carbide, 5% to 15% of seaweed mud, 10% to 20% of additives and 10% to 15% of lubricant.

[0026] The main component of diatom mud is silicon dioxide. There are many pores in the structure of diatom mud, which is conducive to increasing the porosity of porous ceramics and improving the permeability of ceramics.

[0027] The additive is at least one selected from bauxite, industrial alumina and activated alumina. The aluminum oxide in the above additives can form mullite with the silicon dioxide component in the diatom ooze, so as to improve the strength, hardness and ...

Embodiment 1

[0057] The preparation process of the porous ceramic of the present embodiment is as follows:

[0058] (1) According to Table 1, each component was weighed according to the mass percentage (referred to as content in the table) to obtain raw materials. Among them, the median particle size of silicon carbide is 10 microns, the median particle size of seaweed mud is 15 microns, the median particle size of additives is 15 microns, and the median particle size of lubricant is 20 microns. Among them, in bauxite, the mass percentage of aluminum oxide is 89%, the mass percentage of ferric oxide is 1.2%, the mass percentage of titanium oxide is 1.8%, calcium oxide, magnesium oxide The total mass percentage of sodium oxide and potassium oxide is 1%.

[0059] (2) Mix the dispersant and distilled water for 2 hours to form a premix; mix the raw materials with the premix to form a slurry, and when the ball mill is mixed, the mass ratio of the raw material to the grinding medium is 1:2, and...

Embodiment 2

[0066] The preparation process of the porous ceramic of the present embodiment is as follows:

[0067] (1) According to Table 1, each component was weighed according to the mass percentage (referred to as content in the table) to obtain raw materials. Among them, the median particle size of silicon carbide is 5 microns, the median particle size of seaweed mud is 20 microns, the median particle size of additives is 20 microns, and the median particle size of lubricant is 15 microns. In bauxite, the mass percentage of aluminum oxide is 88%, the mass percentage of ferric oxide is 1.5%, the mass percentage of titanium oxide is 2%, calcium oxide, magnesium oxide, oxide The total mass percentage of sodium and potassium oxide is 1.5%.

[0068] (2) Mix the dispersant and distilled water for 2 hours to form a premix; mix the raw materials with the premix to form a slurry, and when the ball mill is mixed, the mass ratio of the raw material to the grinding medium is 1:1, and the mixing ...

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Abstract

The invention relates to porous ceramic as well as a preparation method thereof, an air-floating bearing and application. The preparation method for the porous ceramic comprises the following steps: mixing raw materials to form mixture, wherein the raw materials comprise the following components in percentage by mass: 55%-70% of silicon carbide, 5%-15% of algae mud, 10%-20% of additive and 10%-15%of lubricant, wherein the additive is selected from at least one of bauxite, industrial aluminum oxide and active aluminum oxide, and mass percentage content of aluminum oxide in the bauxite is 85% or above; preparing the mixture into geen body; and sintering the green body to obtain the porous ceramic. The porous ceramic prepared by the method is relatively high in porosity, is relatively high in hardness, and is relatively good in wear resistance.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a porous ceramic, a preparation method thereof, an air bearing and an application thereof. Background technique [0002] Air bearings are mechanical components that use an air film to support loads or reduce friction. As a new type of sliding bearing, air bearing has joined the "bearing" family, one of the basic parts of machinery. Air bearing has four advantages of high speed, high precision, low power consumption and long life. It has important applications in the fields of precision and ultra-precision engineering, micro-engineering, space technology, aerospace medical equipment and nuclear energy engineering. [0003] Due to the low pressure and compressibility of the gas, the air bearing has problems such as small load capacity and low rigidity, and it is easy to cause instability if the design is improper. These issues are gradually being resolved with the advent of poro...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B38/08F16C32/06
CPCC04B35/565C04B38/08C04B2235/3217C04B2235/3418C04B2235/3463C04B2235/425C04B2235/446C04B2235/6562C04B2235/6567C04B2235/96F16C32/0603C04B38/0074
Inventor 谭毅成黎海华向其军
Owner SHENZHEN SUNTECH ADVANCED CERAMICS
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