Silicon nitride ceramic ball for bearings

Source: Bearing network time: 2017-10-21

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For many years, ceramic materials have been the most interesting material for engineers engaged in bearing research. The term â€œceramic bearingâ€ generally makes people think of bearings that are completely made of ceramic and that are red and hot without smooth bearings. The operation will focus on the study of all-ceramic bearings in high temperature environments; for example, air turbine engine bearings. The current bearing is still continuing; but the demand for improved smooth systems. The development work has been concentrated in steel ferrules or rolling Hybrid bearings composed of ceramic balls and ceramic balls. Hybrid bearings have been used in applications where there is an urgent need for machine tool spindles; and their use is becoming more widespread.
There are many kinds of ceramic materials; their composition, microscopic arrangement and function are different. It has been proved that silicon nitride materials have the best physical and mechanical induction functions for bearings. The current annual output of silicon nitride balls worldwide In the millions of grains.
The most important features of hybrid ceramic bearings compared to all types of all-steel bearings are:
1. The working speed is improved; because the density of the silicon nitride ball is low, the centrifugal force is reduced.
2. Increased rigidity; because the elastic modulus of silicon nitride is 50% larger than that of bearing steel.
3. Heat reduction; because silicon nitride ball has a small friction coefficient and good motion function.
4; better thermal stability; because the thermal expansion coefficient of silicon nitride is one-third of steel.
5. The rendering flexibility is greater; due to the silicon nitride data function, the bearing painter can convert different parameters without thinking about the influence.
When applied to machine tools; these features make productivity and processing accuracy improved; the quality of the product is improved. Traditionally, smooth equipment for high-speed spindle bearings is generally selected from oil-air or oil mist smooth systems; The function. On the other hand; the hybrid bearing can safely choose grease smooth. For machine tool builders; the elimination of the oil-gas smooth system can significantly reduce the cost.
Hybrid ceramic bearings for use in aircraft engines are also under development. Air turbine engines operate at high speeds; centrifugal forces on the balls in their bearings; often become a major factor limiting the maximum engine speed. Low-density nitriding The hybrid bearing of the silicon ball provides the possibility of working at higher speeds combined with less heat inside the bearing; it can significantly reduce the component.
The most common way to mix ceramic bearings is an angular contact ball bearing with a silicon nitride ball; this bearing can effectively operate at high speeds both in radial and axial loads.
However, the axial load can only be applied from one direction. Therefore, these bearings are generally paired and preloaded to ensure the correct touch angle. The angular touch ball bearing and the deep groove ball bearing have larger openings at one end; therefore, the reinforced phenolic resin is generally used. Resin cages. Some hybrid bearing products have only turned steel balls into silicon nitride balls in terms of data; on the other hand, several dimensions of the channel have been improved to optimize bearing functions. Other types of ceramic balls Can be used for some special occasions; like external bearings and gyro bearings.

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