Overview of Precision Ceramic Balls

With the development of industrial technology, precision ceramic balls have put forward performance requirements for machine tools and instruments, such as high-speed, high-precision, and high reliability. Compared with traditional bearing steel, advanced ceramics such as silicon nitride have excellent comprehensive properties such as low density, high hardness, high elastic modulus (stiffness), wear resistance, low coefficient of thermal expansion, good thermal and chemical stability, insulation, and no magnetism. They are considered the best material for manufacturing bearing rolling elements and have achieved great success in the application of ceramic ball bearings (steel bearing rings, ceramic rolling elements). Ceramic ball bearings have excellent comprehensive performance such as long service life (2-5 times that of steel bearings), high rotational speed, good overall accuracy and stiffness, good thermal stability, and no magnetism. They have a very broad application prospect in working conditions such as high temperature, high speed, high precision, acid alkali corrosion, electrical corrosion, strong magnetic field, no lubrication or medium lubrication. Ceramic balls have been widely used in aerospace, military, petroleum Many fields such as chemical engineering and high-speed precision machinery.

Overview of Precision Ceramic Balls

At present, the ceramic materials used for precision ceramic balls in bearings mainly include silicon nitride (Si3N4), zirconia (ZrO ₂), alumina AI ₂ O Å, silicon carbide (SiC), etc. Compare the above materials, Si3N4. Excellent comprehensive performance. The advantages of precision ceramic balls are mainly manifested in low density, medium elastic modulus, low thermal expansion coefficient, and excellent internal chemical properties. The most important feature of precision ceramic balls is that their failure mode, like bearing steel, occurs in a pre existing peeling mode, while ZrO ₂ and Al ₂ O Å all occur in a destructive failure mode such as fragmentation. In addition, among these materials, Si3N4 has the lowest density.

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