Silicon nitride bearing ball is a man-made composite product synthesized through several different chemical reaction methods. Parts are pressed and sintered by well-developed methods to produce a ceramic with a unique set of outstanding properties. Silicon nitride ceramic is ideal for bearing parts. Compared with steel, high-performance silicon nitride bearings balls have better mechanical properties under high temperature and could survive from most of the corrosive chemicals.
Advanced Ceramic Materials (ACM) can supply full ceramic and hybrid bearings products made by silicon nitride, zirconia as well as silicon carbide.
|Compressive Strength||3000 MPa|
|Flexural Strength||800 MPa|
|Fracture Toughness KIc||6.5 MPa m^1/2|
|Young’s Modulus E||320 GPa|
|Hardness Vickers (HV 1)||16 GPa|
|Maximum Temperature (Inert Gas)||1200°C|
|Maximum Temperature (Air)||1100°C|
|Thermal Conductivity @ 20°C||28 W/mK|
|Thermal Conductivity @ 1000°C||16 W/mK|
|Thermal Expansion (20–100°C)||2*10-6/K|
|Thermal Expansion (20–1000°C)||3.510-6/K|
|Thermal Shock parameter R1||600 K|
|Thermal Shock parameter R2||15 W/mm|
|Resistivity at 20°C||10^12 Ωcm|
|Resistivity at 800°C||10^7 Ωcm|
|Dielectric constant||6 MHz|
|Working temperature||800 ℃||180 ℃|
|Thermal expansion coeff.||3.4×10-6||12.5×10-6|
|Hardness, HV||1500||About 750|
Silicon nitride bearing ball is one of the most thermodynamically stable technical ceramic material with high hardness as well, silicon nitride ceramic is ideal for bearing parts, especially for those required to work at high speed and high temperature. Si3N4 bearing balls have already been applied in automobiles, rockets high-speed engines, equipment working in a corrosive environment and some performance model cars. Compared with steel, high-performance ceramic balls have better mechanical properties under high temperature and could survive from most of the corrosive chemicals.
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