SILICON NITRIDE (Si3N4) BALLS

Light weight ceramic material balls, they provide very good mechanical/thoughness properties and corrosion resistance. They are auto lubricant materials and good electric insulators. They have excellent resistance to thermal shocks. Balls are manufactured according to ASTM F 2094 Class II standards.
Applications
Special bearings, high-speed bearings, under vacuum pumps, compressors, centrifugal pumps, shafts/mandril, recirculating balls, flow meters, measurement instruments. They are used in aerospace and military industry.
Commercial name
Other name
Formula
Nitride %
Silicon Nitride
Nierite
Si3N4
90.0 - 95.0
Physical / mechanical / thermal / electric / magnetic properties
Property
Symbol
U.o.M.
Type
Notes
Values
Density
δ
[g/cm3]
Physical
Room temp.
3.26
Young's modulus
E
[GPa]
Mechanical
-
300
Friction coefficient
µ
-
Mechanical
Room temp.
0.1
Specific heat
c
[J/kg-K]
Thermal
Room temp.
740
Coefficient of linear thermal expansion
α
[10^-6/ºC]
Thermal
(ΔT=0-100°C)
3.4
Thermal conductivity
λ
[W/(m·K)]
Thermal
Room temp.
23.0
Volume resistivity
ρ
[Ω*m]
Electric
-
> 10^13
Relative magnetic permeability
µ
-
Magnetic
Diamagnetic
<~1
Technical data
Property
Type
U.o.M.
Values
U.o.M.
Values
Hardness
Mechanical
[HV]
1400 - 1600
-
-
Ultimate compressive strength
Mechanical
[MPa]
2300 - 4000
[psix10^3]
334 - 580
Service temperature
Thermal
[ºC]
0 / 1200
[ºF]
32 / 2192
Range
Diameters (min/max)
U.o.M.
Diameters (min/max)
U.o.M.
Precision grades
0.4000 - 200.000
[mm]
1/64 - 8
["]
See section International Standards ISO 3290-2
Corrosion Resistance
Excellent corrosion resistance in all almost corrosive environments, apart from acids (except sulphuric acid) and basic solutions at high concentrations.
Revision n.7