ZTA CERAMIC BALLS

Aluminium Oxide with about 10% content of Zirconium Oxide balls, they feature better mechanical properties, wear and compression resistance and thermal shocks resistance in comparison to nearly pure Aluminium Oxide balls.
Applications
Ball bearings, special pumps and valves mainly when both high corrosion resistance and high heat resistance are required. Medical field applications. They are used even as grinding and machining media.
Commercial name
Other name
Formula
Chemical composition (%)
Zirconia toughened alumina
ZTA
Al2O3 + ZrO2 + Y2O3
Al2O3 ~ 90 / ZrO2 ~ 10
Physical / mechanical / thermal / electric / magnetic properties
Property
Symbol
U.o.M.
Type
Notes
Values
Density
δ
[g/cm3]
Physical
Room temp.
4.13
Young's modulus
E
[GPa]
Mechanical
-
380
Friction coefficient
µ
-
Mechanical
Room temp.
0.52
Specific heat
c
[J/kg-K]
Thermal
Room temp.
900
Coefficient of linear thermal expansion
α
[10^-6/ºC]
Thermal
(ΔT=0-100°C)
8.0
Thermal conductivity
λ
[W/(m·K)]
Thermal
Room temp.
20.0
Volume resistivity
ρ
[Ω*m]
Electric
-
> 10^15
Relative magnetic permeability
µ
-
Magnetic
Diamagnetic
<~1
Technical data
Property
Type
U.o.M.
Values
U.o.M.
Values
Hardness
Mechanical
[HV]
1650 - 1950
-
-
Ultimate compressive strength
Mechanical
[MPa]
1700 - 2300
[psix10^3]
247 - 333
Service temperature
Thermal
[ºC]
-80 / 1500
[ºF]
-112 / 2732
Range
Diameters (min/max)
U.o.M.
Diameters (min/max)
U.o.M.
Precision grades (Internal standard*)
0.500 - 50.000
[mm]
1/32 - 1.15/16
["]
G3-5-6-10-25-40-50-100
Corrosion Resistance
Good corrosion resistance in almost all diluted and concentrated solutions (both acid and basic, for example nitric acid, sulphuric acid and caustic soda) except against hydrofluoric acid and phosphoric acid. The chemical compatibility is similar to Aluminum Oxide ceramic. ZTA balls can be used even in contact with halogens and melted metals.
Notes
Property
Description
*Precision grades
Allowed tolerances on the diameter and maximum allowed roundness for the confirmed precision grade are always communicated in the offer.
Revision n.2