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There is a growing need for bearings that, even while maintaining the same load performance and service life as before, can be used over a long period of time in corrosive solutions. Here at JTEKT, we have been applying a variety of ceramic materials to bearings, thus allowing them to withstand a greater ranger of corrosive environments. If you have any problems dealing with corrosive environments, please feel free to give us a call.(EXSEV Group, Precision Device Bearing Technology Office, Industrial Machinery Application Engineering Dept.)

Based on these corrosion test results, we were able to break down what kind of bearing materials should be used in what kind of environments, and to achieve greater corrosion resistance than before.

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Here at JTEKT, we have provided ceramic bearings primarily made with silicon nitride to handle environments where high corrosion resistance is required. Silicon nitride is a material that has a higher level of corrosion resistance than normal bearing steel or stainless steel

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By using silicon carbide, with its high resistance to acidity, in strong acid environments, and using zirconia, with its high resistance to alkalinity, in strong alkaline environments, we were able to achieve a kind of bearing that can withstand strong acid and alkaline environments on a level impossible with conventional bearings (see Figure 2).

Generic bearings are made with high carbon chromium bearing steel such as JIS G 4805 SUJ2. However, such steel materials have poor corrosion resistance, and cannot be used in corrosive environments. JTEKT, in order to meet the needs of our customers, developed the world’s first bearings made with ceramic materials, which can withstand these corrosive environments. In this way, we became an industry pioneer and achieved tremendous results in various fields and environments.

In contrast to this, we categorized the different types of corrosive environments, and we have prepared a lineup of bearings that, in order to handle a wider range of more severe environments, use the optimal material for each of the different corrosive environments.

However, even though the phrase “corrosive environments” is used, there is actually a difference in qualities such as acidity and alkalinity, as well as variability in the level of corrosiveness. For this reason, even silicon nitride has its limits: depending on the environment in which it is used, it could get damaged quickly, its service life could be shortened, and it could therefore be insufficient for certain environments (see Figure 1).

Furthermore, by conducting corrosion tests with various corrosive solutions, we got the corrosion resistance results of different ceramic materials shown in Table 2.