Alumina ceramics

Aluminium Oxide (Alumina) is the most widely used ceramic material with near limitless manufacturing capabilities. They are grouped together based on purity levels, as the purity of Alumina’s increases wear and corrosion resistance also increases. KETAO Industrial Ceramics stocks more alumina ceramic tubes than any other supplier. Our vast, readily-available inventory allows us to supply our customer’s ceramic tube needs immediately,even for hard-to-find or specialty products. Alumina’s are used in a variety of general-purpose applications, and their grade is chosen based on the application environment. Higher purity Alumina’s can be formulated for more demanding applications. Typical Applications Include: Wear resistant components, High pressure nozzles, Thermocouple tubes,  Electrical Insulators, Corrosive labware, Furnace fixtures, Ballistic armor, Thread guides, Laser Tubes, and Pump seals.

Alumina Ceramics Description:


1.Hard, wear-resistant

2.Excellent dielectric properties from DC to GHz frequencies

3.Resists strong acid and alkali attack at elevated temperatures

4.Good thermal conductivity

5.Excellent size and shape capability

6.High strength and stiffness

7.Available in purity ranges from 62% 75% 85% 95%, an easily metallizable composition, to 99.8% for the most demanding high temperature applications.

Typical Usage:

Electric Insulator,Electric Socket & Plug,Resister Case,Terminal Block & Base,Heat Resist Components,Fuse Holder,Cigar Lighter,Dielectric Ceramics,Components of Various Shapes,Focus Ring & Edge Ring,Wafer Finger & Robot Arm,Precision Nozzle&Disk,Plunger, Pump & Valve,Bolt,Nut & Clamp,Knife & Cutter, Jig & Fixture,Roller for Paper Manufacturing,Mechanical Seal & Water Seal,High Precision Components,Ceramic Liner,Automobile Assembly Parts,Mechanical Seal Ring,Susceptor & Crucible Boat,Chemical Pump Parts,Carbon & Graphite Components

Density, ρ g/cm3 3.7-3.97
Water Absorption % @ room temperature (R.T.) 0
Hardness Mohs 9 Mohs 9
Hardness Knoop (kg/mm2) 2000
Compressive Strength MPa @ R.T. 2070-2620
Tensile Strength MPa @ R.T. 260-300
Fracture Toughness, Kic MPa x m1/2 4.5
Max. Use Temperature (in air) ºC 1750
Thermal Shock Resistance ∆T (ºC) 200
Thermal Conductivity W/m-K @ R.T. 35
Coefficient of Linear Thermal Expansion, αl µm/m-ºC  (~25ºC through ±1000ºC) 8.4
Dielectric Constant 1 MHz @ R.T. 9.6
Dielectric Strength kV/mm 15