Aluminium oxide ceramics

Products from aluminum oxide (alumina, corundum) are in demand more than any other high-quality ceramic material.

Back

Items manufactured from refractory metals and alloys

Aluminum oxide-based ceramic products (Al2O3)

Description Specifications

The main properties of alumina (Al2O3):

High hardness;

Good thermal conductivity;

Excellent corrosion resistance;

Low density;

Preservation of strength at high temperatures;

Electrical insulation properties;

Low cost in relation to other ceramic materials.

The main areas of use from corundum (aluminum oxide):

Lining of wear equipment;

Mechanical seal rings;

Dies, wiring, guides;

Bearings;

Grinding bodies;

Burners;

Crucibles;

Elements of valves and valves;

Nozzles for devices for argon-arc welding;

Electrical insulators.

There are several modifications of aluminum oxide depending on the content of the main phase and impurities, which differ in strength and chemical resistance.

Al₂O₃	%	60	75	80	85	92	95	99	99.7
Density	g/сm³	3.0	3.1	3.3	3.4	3.6	3.7	3.81	3.85
Bending strength	MPа	205	280	215.7	230	312	304	340	370
Coefficient of linear thermal expansion	10^-6/^оС (25-800^оС)	7.1	7.6	7.6	7.6	7.5	7.3	7.6	7.6
Dielectric Strength	kV/mm	10
Electrical resistivity	20°С ,Ω•сm 300°С,Ω•сm	>1014 >1013	>1014 >1013	>1014 >1013	>1014 >1013	>1014 >1013	>1014 >1012	>1014 >1010	>1014 >1010
Operating temperature	^оС	1350	1000	1250	1290	1390	1480	1600	1700
Mohs' hardness		7.5	7.5	7.5	7.5	8.5	8.8	9.0	9.0
Fire resistance	^оС	1800	1700	1800	1850	1920	2000	2030	2040