ALUMINUM OXIDE CERAMIC BALLS (Al2O3)
Polycrystalline structure light weight oxide balls, they provide good mechanical characteristics, corrosion, abrasion and heat resistance. They are auto lubricant and good electric insulators. Natural colour white/ivory.
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Applications
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Special bearings, check valves, pumps and valves that operate in aggressive environments, petroleum pumps, flow meters, measurement instruments, medical devices.
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Commercial name
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Other name
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Formula
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Oxide %
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|---|---|---|---|
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Aluminum Trioxide
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Alumina
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Al2O3
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99.00 - 99.99
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Physical / mechanical / thermal / electric / magnetic properties
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Property
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Symbol
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U.o.M.
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Type
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Notes
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Values
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|---|---|---|---|---|---|
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Density
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δ
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[g/cm3]
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Physical
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Room temp.
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3.90
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Young's modulus
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E
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[GPa]
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Mechanical
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-
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365
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Friction coefficient
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µ
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-
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Mechanical
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Room temp.
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0.2
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Specific heat
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c
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[J/kg-K]
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Thermal
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Room temp.
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795
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Coefficient of linear thermal expansion
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α
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[10^-6/ºC]
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Thermal
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(ΔT=0-100°C)
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7.8
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Thermal conductivity
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λ
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[W/(m·K)]
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Thermal
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Room temp.
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31.0
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Volume resistivity
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ρ
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[Ω*m]
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Electric
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-
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> 10^14
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Relative magnetic permeability
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µ
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-
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Magnetic
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Diamagnetic
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<~1
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Technical data
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Property
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Type
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U.o.M.
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Values
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U.o.M.
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Values
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|---|---|---|---|---|---|
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Hardness
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Mechanical
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[HV]
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1250 - 1700
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-
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-
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Ultimate compressive strength
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Mechanical
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[MPa]
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2100 - 2600
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[psix10^3]
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304 - 377
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Service temperature
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Thermal
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[ºC]
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-100 / 1600
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[ºF]
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-148 / 2912
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Range
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Diameters (min/max)
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U.o.M.
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Diameters (min/max)
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U.o.M.
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Precision grades (ISO 3290 / AFBMA)
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|---|---|---|---|---|
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0.300 - 100.000
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[mm]
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1/64 - 4
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["]
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G10-16-20-25-28-40-60-100
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Corrosion Resistance
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Excellent corrosion resistance in water, salt solutions, acids, they are resistant even into aggressive environments excepted hydrofluoric, hydrochloric acids, hot sulphuric acid and strong alkaline solutions.
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Revision n.12