The performance comparison of four bearing materials, namely high-temperature resistant ceramic deep groove ball bearing 6004CE silicon nitride, ordinary bearing steel AISI52100 (GCr15), stainless steel AISI440 (9Cr18), silicon nitride (Si3N4), and zirconia (ZrO2), shows that ceramic bearings, as an important mechanical foundation component, are at the forefront of the new material world in terms of high temperature resistance and super strength due to their excellent performance that metal bearings cannot match. In the past decade, it has been increasingly widely applied in various fields of national economy and people's livelihood. The first advantage is that ceramics are almost not afraid of corrosion, so ceramic rolling bearings are suitable for operation under harsh conditions filled with corrosive media. Secondly, due to the lower density and lighter weight of ceramic rolling balls compared to steel, the centrifugal effect on the outer ring during rotation can be reduced by 40%, thereby greatly extending their service life. Thirdly, ceramics are less affected by thermal expansion and contraction than steel, so when the clearance between bearings is constant, they can allow bearings to work in environments with significant temperature differences. Fourthly, due to the higher elastic modulus of ceramics compared to steel, they are less prone to deformation under stress, which is beneficial for improving working speed and achieving higher accuracy. The main applications of ceramic bearings include high temperature resistance, cold resistance, wear resistance, corrosion resistance, resistance to magnetic and electrical insulation, oil-free self-lubricating, and high speed. It can be used in extremely harsh environments and special working conditions, and can be widely applied in aviation, aerospace, navigation, petroleum, chemical, automotive, electronic equipment, metallurgy, power, textiles, pumps, medical equipment, scientific research, and national defense and military fields. It is a high-tech product for the application of new materials. The rings and rolling elements of ceramic bearings are made of all ceramic materials, including zirconia (ZrO2), silicon nitride (Si3N4), and silicon carbide (Sic). The retainer is made of polytetrafluoroethylene, nylon 66, polyetherimide, zirconia, silicon nitride, stainless steel or special aviation aluminum, thereby expanding the application range of ceramic bearings.