Advantages and disadvantages of ceramic racing bearings

Ceramic racing bearings atomic structure, covalent bonds inherent in non-metals. This means that they share electrons, and this atom has a strong adsorption force, due to this reason, ceramic racing bearings offer some better performance than metal bearings. They are usually very hard, elastic, and lightweight. This means that the load is applied together with improved wear characteristics when the shape changes.

Ceramic racing bearings run lubrication-free. This is because ceramic materials are not micro welded. Micro welding occurs when, usually with metals, imperfections on the rolling element and raceway surfaces interact with one another causing an arc. This reduces the surface and greatly reduces the life of the bearing. Ceramic materials do not have this problem, which makes them suitable for a variety of applications that require a lubricant-free environment. They usually behave in a stable manner at high temperatures which means there is less thermal expansion. It requires substantially more energy to increase the bond length of a covalent bond compared to metal ionic bonds.

Ceramics are non-metallic, non-ferrous materials. They do not corrode in the same way as metals when exposed to water and other harmful chemicals. Their high corrosion resistance allows for their excellent performance in wet and chemically aggressive environments. Many engineering ceramics also have low densities, resulting in improved bearings' operating speeds, which are due to lower centripetal force and reduced friction. Due to the lack of free electrons in most ceramics, they are nonmagnetic and excellent insulators. When researching ceramic bearings, the first thing one might notice is that they are basically more expensive than metals. There are many reasons.

There are extremely high energy and processing costs associated with the large amount of energy required to reach the temperatures required for the sintering process of high-grade raw materials. Because ceramics are so laborious, machining and grinding costs add up rapidly when manufacturing precision bearings. All of this must be done in a clean environment with a skilled workforce. Ceramics are incredibly sensitive to impurities in their pores, so any contamination could cause premature failure. As the size increases, the price also increases exponentially because of the high cost and processing method requirements. These include the need for a slower sintering process in order to overcome temperature gradients in the green body, the amount of uniform applied pressure over larger volumes and the resulting machine cost.

Ceramic racing bearings have lower load carrying capacity compared to metal and are sensitive to thermal shock. Thermal shock is when a temperature gradient within a material causes differential expansion, which causes internal stress. Such stresses can exceed the strength of such materials to form cracks.

Ceramics are also more difficult to achieve a high-quality surface finish. It can grind them to a radium 0.1 surface finish, which allows a P5 precision class to be achieved.

Overall, the advantages and disadvantages of ceramic racing bearings can be summarized as follows:
Ceramic racing bearings advantages: can be used in high temperature, insulation, corrosion resistance, non-lubricating occasions.
Disadvantages of ceramic racing bearings: difficult processing and high cost.

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