Machining / Grinding Alumina (Aluminum Oxide) Ceramics

CiDRA® Precision Services, LLC has years of experience manufacturing micron level tolerance products from Alumina (Aluminum Oxide) Ceramic. We leverage our in-depth dicing, drilling, milling, grinding, and polishing capability to manufacture the highest quality Alumina (Aluminum Oxide) products.

Whether you need prototypes or volume production, CiDRA® Precision Services, LLC is here to help. Please contact us to discuss your applications.

About Alumina (Aluminum Oxide)

Aluminum Oxide (Al2O3), or Alumina, is one of the most versatile refractory ceramic oxides. Alumina can exist in several crystalline phases, with the alpha phase being the most common for engineering applications because of its high stiffness, strength, corrosion resistance, and very high temperature resistance. High purity Alumina is usable in oxidizing atmospheres at temperatures exceeding 1900°C. The exact material properties depend strongly on the percentage of Aluminum Oxide.

Alumina (Aluminum Oxide) Applications

  • Arc chamber liners
  • Alignment chucks
  • Ballistic armor
  • Brazing fixtures
  • Ceramic cups
  • Conveyor rollers
  • Electronics substrates
  • Heat spreaders
  • High voltage insulators

Alumina (Aluminum Oxide) Properties

Units

Alumina (>99%)

Alumina
(95-99%)

Alumina
(90-95%)
Max Use Temperature
(No Load)		 C 1750 1200 - 1700 1500 - 1700
Thermal Shock (Quenching) C 97 - 210 150 - 200 160 - 250
Thermal Conductivity W/(m K) 19 - 35 16 - 28 14 - 25.6
Specific Heat  J/(K kg) 850 - 1050 850 - 1050 850 - 1050
Coefficient of Thermal Expansion 1/C (x10e-6) 6.9 - 8.9 6.0 - 8.2 6.0 - 8.2
Color Ivory White White
Moh Hardness 9.0 9.0 9.0
Vickers Hardness kg/mm^2 1460 - 2340 1220 - 2040 1070 - 1530
Knoop Hardness kg/mm^2 1435 - 2000 2000 2000
Density g/cm^3 3.7 -3.9 3.5 - 3.9 3.4 - 3.8
Porosity % of nominal 0 0 0
Compressive Strength Mpa 2000-2680 1720 - 2500 2000-2500
Tensile Strength Mpa 170 - 310 220 - 248 125 - 265
Flexural Strength MPa 300 - 560 280-400 230 - 400
Fracture Toughness MPa m^1/2 3.8 - 5.5 3.5 - 5 2.5 - 5.9
Young's Modulus GPa 300 - 396 220 - 350 220 - 400
Poisson's ratio .21 - .22 .21 - .22 .21 - .22
Dielectric Strength kv/cm 87 - 350 83 - 430 83 - 260
Dielectric Constant (@1MHz) 9.7 - 10.1 9.0 - 9.8 8.8 - 10.0
Dielectric Loss Tangent .0001 - .001 .00019 - .001 0.0002 - 0.0015
Resistivity ohm cm >10^14 - >10^17 >10^14 - >10^17 >10^14 - >10^16

The information provided in this table is for room temperature only, and is a compilation of publicly available data.  This information is provided for comparison purposes only, and is not intended to be warrantable.   Further, CiDRA® Precision Services, LLC disclaims any and all liability from errors, inaccuracies, or omissions.

 

Please contact us if you would like to discuss your Alumina dicing, drilling, milling, grinding, polishing or any other machining applications.