SC0910 Silicon Nitride Bearing Ball, Si3N4

Catalog No.	SC0910
Size	Diameter: 1~30mm
Material	Si3N4 Ceramic
Purity	97%~99%
Density	3.44g/cm3

Silicon Nitride Bearing Ball Description

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.

China Special Ceramic Parts, Inc. (CSCPI) can supply full ceramic and hybrid bearings products made by silicon nitride, zirconia as well as silicon carbide.

Silicon Nitride Bearing Ball Specifications

GPSN

Property
Color	Grey
Mechanical Properties
Density	3.21 g/cm3
Compressive Strength	3000 MPa
Flexural Strength	800 MPa
Weibull-Modulus m	15
Fracture Toughness KIc	6.5 MPa m^1/2
Young’s Modulus E	320 GPa
Poisson Ratio	0.28
Hardness Vickers (HV 1)	16 GPa
Thermal Properties
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
Electrical Properties
Resistivity at 20°C	10^12 Ωcm
Resistivity at 800°C	10^7 Ωcm
Dielectric constant	6 MHz

Comparison of Si3N4 Ceramic and Steel for Bearing Balls

	Si3N4	Steel
Working temperature	800 ℃	180 ℃
Density	3.21g/cm3	7.8 g/cm3
Thermal expansion coeff.	3.4×10-6	12.5×10-6
Hardness, HV	1500	About 750
Young’s Module	320GPa	208GPa
Corrosion resistance	Good	Poor
Thermal conductivity	Poor	Good
Magnetism	No	Yes
Wear resistance	Excellent	Good

Silicon Nitride Bearing Ball Applications

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.