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Aluminum Oxide (Al2O3)

Aluminum Oxide (Al2O3)

Alumina Ceramic is one of the most widely used and most cost-effective technical ceramics, known for its outstanding mechanical strength, thermal stability, electrical insulation, and chemical resistance. Available in various purities, alumina ceramics are tailored to meet the demands of diverse industries, including photovoltaics, machinery, electrical appliances, electronics and power, petrochemicals, automotive, food, medical, military, and aerospace.

Properties

High hardness
High mechanical strength
Outstanding wear resistance
High temperature resistant
Good electrical insulation
Low dielectric constant
Good acid & alkali resistance

Properties Data

ltem	Unit	95% Al2O3	96% Al2O3	99% Al2O3	99.5% Al2O3	99.7% Al2O3	99.8% Al2O3
Purity	%	95	96	99	99.5	99.7	99.8
Color	-	White/Pink	White	lvory	lvory	lvory	lvory
Density	g/cm³	3.65	3.72	3.85	3.90	3.92	3.92
HV Hardness	-	>1300	>1300	1700	1750	1800	1800
Fracture Toughness	Mpa.m^½	3-4	3-4	3-4	4	4	4
Young's modulus	Gpa	320	330	340	370	380	390
Flexural Strength@25°C	Mpa	300	300	330	375	380	390
Compressive Strength@25°C	Mpa	2200	2200	2350	2450	2480	2500
Thermal Conductivity@25°C	W/m.k	18-22	≥24	27	29	30	32
Thermal Expansion Coefficient(25-1000°C)	10^-^⒍mm/°C	8	8	8	8	8	8
Thermal Shock Resistance	∆T(°C)	220	220	180-200	180-200	180-200	180-200
Max. Working Temperature	°C	1500	1500	1650	1700	1700	1700
Dielectric Strength	kv/mm	16	17.2	20	22	22	22
Electrical Resistivity@25°C	Ω.cm	10¹⁴	10¹⁴	10¹⁴	10¹⁴	10¹⁴	10¹⁴
Dielectric Constant (@1MHz, 25°C)	-	9	9	9.7	9.7	9.7	9.8
Dielectric Loss (@1MHz, 25°C)	-	0.0004	0.0002	0.0002	0.0002	0.0001	0.0001

Note: above data is for reference only, the values may vary according to product configuration, geometry and manufacturing process.

Applications

Seal rings for pumps
Plungers or pistons for valves
Electronic ceramic substrates
Thermocouple protection tubes
Textile eyelets or guides
Electrical insulators
Heat resistant ceramic crucibles
Ceramic parts for high temperature furnace

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