Multihole ceramic bearing and manufacturing method thereof

Abstract

The invention provides a manufacturing method of a multihole ceramic bearing. The manufacturing method comprises the steps of fully and uniformly mixing an enhanced type zirconium oxide composite ceramic powder material, a pore forming material and an adhesive to obtain mixed slurry; molding powder obtained by drying the mixed slurry by a die to obtain a green blank; sintering the green blank to obtain a bearing blank body; performing vacuum oil soaking treatment on the bearing blank body. According to the preparation method disclosed by the invention, the bearing is manufactured by the enhanced type zirconium oxide composite ceramic powder material; by the technically enhanced partially stabilized zirconium oxide, the phase change toughening action is enhanced, and the mechanical property of ceramic is improved; the problem of low-temperature aging of existing partially stabilized zirconium oxide is solved.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic materials, and in particular relates to a porous ceramic bearing and a manufacturing method thereof. Background technique [0002] As an emerging mechanical basic part, ceramic bearings have excellent performance incomparable to metal bearings in terms of corrosion resistance and oxidation resistance, mechanical properties, thermal expansion coefficient, hardness and friction resistance. Therefore, using the excellent performance of the ceramic material itself to replace the metal material to prepare the fan bearing can greatly prolong the service life of the bearing and reduce the noise during use. [0003] At present, zirconia ceramic fan bearings are widely used in the market. Zirconia ceramics are used to make bearing sleeves and shaft cores, processed and polished into mirror surfaces, and then assembled into bearings. Due to the high hardness of zirconia ceramics and the low coeffici...

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Problems solved by technology

However, this kind of bearing also has inherent disadvantages: since zirconia ceramics are fatal sintered bodies with a water absorption rate of 0, it is impossible to absorb a large amount of lubricating oil like metal oil bearings. At the same time, due to the low thermal conductivity of zirconia ceramics, certain After a period of time, the heat generated by friction cannot be effectively dissipated. After the bearing heats up, a large amount of lubricating oil will volatilize, which increases the friction coefficient between the shaft sleeve and the shaft core, and aggravates the wear of the bearing.

But the defect of this method is obvious, because the ability of oil storage is directly proportional to sufficient porosity and pore diameter; and the mechanical properties of porous ceramic materials such as wear resistance decrease sharply with the increase of porosity and pore diameter, which The two are contradictory

In addition, even if the 3Y-ZTP material with the most stable mechanical properties among zirconia is used with a porous structure, when the bearing is operated at a temperature of 100-400°C for a long time, low-temperature aging is prone to occur, and the strength and wear resistance are greatly reduced. , and even material spalling occurs on the inner surface of the bearing

Therefore, the performance of the final porous ceramic bearing of the single oxide porous ceramic sintered body prepared only by adding a pore-forming agent cannot fully meet the requirements of the fan ceramic bearing.

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