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What Is Kind Of Characteristics Ceramic Bearings Manufacturers Have

Release time : 2015-06-10 11:31:22
By Bearing Manufacturer>Bearing News>What is Kind of Characteristics Ceramic Bearings Manufacturers Have? ?2004-2012 Ceramic bearings manufacturers are speed up their business, and why? Because of growing process demands, standard bearings are more rapidly reaching their limits of employability. With the proper choice of bearing technology, lubricant and fit, failures can be minimized and lifetimes extended. Ceramic bearings manufacturers have seized market demand. The vacuum and semiconductor industries place very high demands on mechanical components. In the case of bearings, it is typically not possible to use the same general principles in vacuum environments that hold true under normal atmospheric conditions. For these applications, the choice of the right material, lubricant and fit is critical. Full ceramic ball bearings consist of rings and balls made of ceramic. In contrast, the rings of a hybrid bearing are made of high-value bearing steel. Ceramic and hybrid bearings have a variety of advantages over standard bearings. For instance, test-stand examinations of standard steel vs. hybrid bearings show that under the same load conditions, the steel bearing shows a 2-3x higher frictional force than the hybrid bearing. There is also a noticeable strong fluctuation of the friction coefficient of the steel bearing, which suggests high abrasion. Dry running is advantageous in many circumstances. For example, rolling bearings have been used in handling systems in vacuum application and under high thermal stress. Although high-performance ceramic groups play a vital role in new application development for rolling bearings, only two ceramics, Si3N4 and ZrO2, prove adequate to be used today. Hot isostatic-pressed Si3N4 is especially applicable; full ceramic bearings consist of rings and balls made of it. Advantageous properties include extreme over-rolling resistance, low density, very good corrosion resistance which much stronger than Stainless Steel Bearings, and high hardness and stiffness, as well as good temperature and abrasion characteristics. These properties are the result of the mainly covalent bonding of the ceramic that has been built up. After the development of series production technology for manufacturing powder, Si3N4 is the most frequently used ceramic in rolling bearings today. Typical Si3N4 materials are alloyed with yttrium oxide (Y2O3) or magnesium oxide (MgO). Zirconium oxide is used as an alternative ring material in full ceramic bearings. This newer development of oxide ceramic distinguishes itself through its steel-like material properties. For instance, the connection to metallic surrounding parts is simplified through an almost identical heat expansion coefficient as standard bearing steel. The analysis of test-stand experiments and experience by Ceramic bearings manufacturers shows that there are different limit loads and speeds depending on the lubrication condition. The influence of changing operating conditions needs to be estimated as well. A statement regarding the lifetime of a bearing can, therefore, often only be obtained through testing. However, our experience showed that a hybrid or full ceramic bearing may have a factor of 2-100x longer lifetime than a standard bearing.