Aluminium oxide (Al2O3)

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Volumetric ceramic parts made of aluminum oxide Al2O3 are the basis for the creation of ceramic capacitors, resistors, insulators, covers and various semiconductor elements and electrical products.

The raw material for the production of vacuum-tight ceramics Al2O3 is corundum, so ceramics are often called not only "aluminum oxide", but also corundum ceramics. Vacuum-tight corundum ceramics are resistant to various acids and other aggressive media, and are an excellent durable insulator. Substrates made of Al2O3 do not lose their performance in case of sudden temperature changes.

An important role is played by the percentage of aluminum oxide in the total volume and its crystal lattice. They determine its future performance characteristics, such as thermal conductivity, hardness, bending strength, coefficient of specific expansion and others.

Specifications

Properties	Conditions	Units of measurement	Materials
Properties	Conditions	Units of measurement	Al2O3 75%	Al2O3 95%	Al2O3 99%	Al2O3 99,5%
Colour			brown	white	white	white
Bulk density		г/см³	≥ 3,20	≥3,63	≥3,85	≥3,90
Water absorption	—	%	—	0	0	0
Flexural strength		МПа	250 ~ 280	≥280	≥338	≥379
Compressive strength		МПа	—	≥2000	≥2240	≥2240
Modulus of elasticity		ГПа	160	≥280	≥250	410
Poisson 's Ratio			—	0,23	0,23	0,24
Coefficient of thermal expansion	20-800 °C	10^-6 /°C	5 ~ 5,5	5,0~8,0	6,2~8,0	6,5~8,0
Thermal conductivity	25 °C	Вт/м∙K	17	18 ~ 24	27 ~ 32	27 ~ 32
Heat shock resistance	ΔT	°C	190	≥220	≥200	≥200
Maximum operating temperature		°C	1300	1500	1580	1600
Dielectric constant	1 МГц	—	8,3 ~ 9,0	9,5	9,5 ~ 10,2	9,5 ~ 9,8
Dielectric losses	1 МГц	∙10^-4		1 ~ 5	1 ~ 70	5
Dielectric strength	DC	кВ/мм	25 ~ 30	14,5	13 ~ 18	15
Volumetric resistance	25 °C	Ом∙см	≥ 10¹²	≥ 10¹⁴	≥ 10¹⁴	≥ 10¹⁴
	300 °C	Ом∙см	—	10¹² - 10¹³	≥ 8 * 10¹¹	≥ 10¹²
	500 °C	Ом∙см	—	≥ 10⁹	≥ 5 *10¹⁰	≥ 2*10⁹

Thick film			нет	Mo/Mn + Ni	Mo/Mn + Ni	Mo/Mn + Ni

Application area

power electronics, converter equipment (radio communication devices, broadcasting equipment, medical electrical equipment, etc.);
insulation gaskets for heat removal from electronic components to the cooling radiator;
protectors for elements of piezoelectric converters;
auto electronics (multiplicated boards for resistors, rheostats, fuel level sensors, pressure sensors, LED headlights, electric power steering, ABS, ASR systems, etc.)
precision substrates for microwave GIS and microassemblies with a high density of holes and recesses for crystals;
carriers of sensor circuits of toxic substances, ionizing radiation, magnetic field, etc.;
semiconductor industry (thermoelectric modules and heat removal devices, analytical equipment, wireless power sources, energy-efficient waste heat disposal systems, radio electronic, laser and optical systems, LEDs (energy-saving technologies), IGBT modules

Aluminium oxide (Al2O3)

Specifications

Application area

See also