We can not live without some mechanical equipment, because it is also a part of our life. Bearing is an important basic component of machinery and so on. However, bearings are also made of many materials. Different materials are suitable for mechanical equipment. Ceramic bearings may not be well understood by everyone. What are the advantages and disadvantages of ceramic bearings? Ceramic bearings or metal bearings are better than metal bearings.
Advantages and Disadvantages of Ceramic Bearings
Ceramic bearing atomic structure, non-metallic inherent covalent bond. This means that they share electrons, which have strong adsorption. For this reason, ceramic bearings provide some better performance than metal bearings. They usually have high hardness, elasticity and lightness. This means that the load is applied in conjunction with the improvement of wear resistance when the shape changes.
Ceramic bearings run without lubrication. This is because ceramic materials are not slightly welded. When micro-welding occurs, it usually interacts with metal, when defects on rolling elements and raceway surfaces interact with another kind of arc. This reduces the surface and greatly reduces the life of the bearing. Ceramic materials do not have such problems, which makes them suitable for various applications requiring a free lubricant environment. They usually operate at high temperatures, which means less thermal expansion in a stable manner. It requires a lot more energy to increase the bond length of a covalent bond than that of a metal ion bond.
Ceramics are non-metallic and non-ferrous materials. When exposed to water and other harmful chemicals, they do not corrode in the same way as metals. Their high corrosion resistance allows them to excel in wet and chemical corrosive environments. Many engineering ceramics also have low densities, resulting in’working speed’of bearings, which is improved due to low centripetal force and reduced friction. Because of the lack of free electrons in most ceramics, they are non-magnetic and excellent insulators. The first thing people may notice when studying ceramic bearings 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 achieve the sintering temperature of high-grade raw materials. Because ceramics are so hard, the cost of processing and grinding increases rapidly when manufacturing precision bearings. All this must be done in a clean environment with skilled labor. Ceramics are incredibly sensitive to impurities in their pores, so any contaminants may cause premature failure. With the increase of size, the price also increases the index because of the high cost and the requirement of processing method. These include, in order to overcome the temperature gradient of green billet, the amount of uniform pressure applied in a larger volume and the resulting machine cost requires a slower sintering process.
Ceramic bearings have lower load carrying capacity than metal bearings and are sensitive to thermal shock. Thermal shock is when the temperature gradient in the material causes different expansion, which leads to internal stress. This pressure can exceed the cracking strength of such materials.
Ceramics are also more difficult to achieve high-quality surface finish. It can grind them to a surface finish of radium 0.1, which allows for a P5 accuracy level. However, due to recent technological advances, higher precision classes are now available for Carter ceramic bearings. Overall, Jiuzheng Hardware Network Xiaobian believes that the advantages and disadvantages of ceramic bearings can be summarized as follows:
Ceramic bearing advantages: can be used in high temperature, insulation, corrosion resistance, no lubrication occasions.
Defects of ceramic bearings: difficult processing and high cost.
Ceramic bearings or metal bearings?
1. The fatigue life of all-ceramic bearings is 10-50 times longer than that of all-steel bearings. The life of hybrid ceramic bearings is about 3-5 times longer than that of all-steel bearings. The life of ceramic bearings is much higher than that of metal bearings.
2. The friction coefficient of ceramic bearings is low, so the lubrication ability of oil-lubricated ceramic bearings is not lower than that of traditional lubricants commonly used in steel bearings when lubricating oil becomes thinner or scarce.
3. The steel property of ceramic bearings is larger than that of metal bearings, and the elastic modulus of ceramic materials is higher. The rigidity of ceramic bearings is 15-20% higher than that of common steel bearings.
4. Ceramic bearings are more corrosion resistant than metal bearings. Ceramic bearings have better corrosion resistance and wear resistance than metal bearings because of their different materials.
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