Alumina Ceramic – Aluminum Oxide

Physical Properties Of Associated Ceramics Alumina

Aluminia
Aluminia

Modern alumina (Al2O3) products are among the strongest and hardest of all ceramic materials. They also have a high dielectric strength, and at elevated temperatures such as those encountered in many applications, their electrical resistance is excellent. Alumina ceramics also feature very high mechanical strength, high thermal conductivity, and high resistance to chemical and corrosion attack at room and elevated temperatures. Further, this valuable class of materials can be made extremely hard - second only to diamond on the Mohs’ scales for resistance to wear and abrasion.

Many of alumina’s outstanding properties can be enhanced through variations in manufacturing methods and in chemistry. Associated Ceramics has earned a reputation for achieving dimensionally accurate alumina parts with excellent quality and reproducibility. The following table describes many common alumina bodies; we can work with other formulations as well.

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ACT Material
Code >
  AC-AL1090 AC-AL850 AC-AL900 AC-AL920 AC-AL940 AC-AL960 AC-AL980 AC-AL8020 AC-AL998 AC-ZTA
Description >   80% 85% 90% 92% 95% 96% 98% 99.5% 99.80% Zirconia Toughened Alumina
Color - White White White White White White White Ivory Ivory White
Density g/cc 3.40-3.45 3.45-3.50 3.55-3.60 3.60-3.65 3.70-3.75 3.70-3.75 3.75-3.80 3.75-3.85 3.90-3.95 4.00-4.05
Porosity % 0-1 0-1 0-1 0-1 0-1 0-1 0-1 0-1 0-1 0-1
Flexural
Strength
psi (MPa) 40,000 (276) 42,000 (290) 45,000 (310) 47,000 (324) 48,000 (331) 50,000 (345) 52,000 (358) 50,000 (345) 54,000 (372) 60,000 (414)
Compressive
Strength
psi (Mpa) 260,000 (1,792) 280,000 (1,930) 300,000 (2,068) 350,000 (2,413) 350,000 (2,413) 350,000 (2,413) 350,000 (2,413) 350,000 (2,413) 350,000 (2,413) 350,000 (2,413)
Tensile
Strength
psi (MPa) 21,000 (145) 22,000 (152) 30,000 (205) 32,000 (221) 30,000 (205) 32,000 (221) 35,000 (241) 32,000 (221) 40,000 (276) 42,000 (290)
Elastic
Modulus
psi x 106 (GPa) 32 (221) 32 (221) 40 (275) 42 (290) 44 (303) 44 (305) 50 (345) 50 (345) 54 (372) 50 (345)
Fracture
Toughness
MPa/m 3-4 3-4 4-5 4-5 4-5 4-5 4-5 4-5 4-5 4-5
Dielectric
Strength
Volts/mil 250 250 210 210 210 210 220 210 220 210
Dielectric
Loss Tangent
@ 1 MHz 0.0004 0.0004 0.0004 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0005
Thermal
Conductivity
W/m°K 16.0 16.0 17.0 20.0 22.0 22.5 27.0 27.0 30.0 27.0
Coefficient
Of Thermal
Expansion
cm/cm/°C
(RT to 700°C)
7 7 8 8 8 8 8 8 8 8
Safe Use
Temperature
°F
°C
2400
1315
2600
1425
2700
1480
2850
1565
3000
1650
3000
1650
3100
1700
3200
1750
3100
1700
2700
1480

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