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Aluminum Oxide (Alumina) & Alumina Products
           

Alumina engineered ceramic parts can be formed by single axis pressing, isostatic pressing, injection molding, slip casting, or extrusion.

        
Alumina is the most versatile engineered ceramic because of its high temperature service limit along with its chemical, electrical and mechanical properties. It is also relatively low cost, is easily formed and finished using a number of fabrication methods including injection molding for low cost, high volume production runs. It is often compounded with silica or trace elements to enhance its properties or fabrication and commonly will range from 92% to 99.8% Al2O3. Higher purity, gel cast material can be found under our REPTON brand.
       
Alumina engineered ceramic parts can be formed by single axis pressing, isostatic pressing, injection molding, slip casting, or extrusion. Parts can "green machined" to near net size before firing and then "hard" ground using diamond tooling to tolerances less than 0.0002" (0.005 mm). Special grades of alumina can be metallized and/or brazed to metal parts.
           
For special grades of ISOPRESSED alumina for plain and metallized tubes see our ISO ALUMINA Data Sheet and for very large gel cast shapes and ultra high purity (99.99%) see our REPTON and SEMICONDUCTOR pages.
           
           

Alumina Oxide (Alumina) Properties

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Marketech Intl, Inc.

  

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Properties Condition Units 960P 975P 998P 96S IP-95 IP-99
Mechanical
Al2O3 Minimum - % 96.0 97.6 99.8 96.0 99.5 95.0
Bulk Density 20°C g/cm3 3.67 3.72 3.96 3.77 3.65 3.85
Tensile Strength 20°C MPa 205 205 220 nd 160 240
Flexural (Bending) Strength 20°C MPa 375 375 410 295 300 350
Elastic Modulo 20°C GPa 300 355 375 nd 300 350
Hardness 20°C MPa 10 12 14 nd nd nd
Fracture Toughness 20°C MPa-m1/2 4-5 4-5 4-5 nd nd nd
Porosity 20°C % 0 0 0 0 0 0
Thermal
Max. Working temperature

Coef. Thermal Expansion		 - °C 1600 1650 1700 na 1500 1700
25-300°C 10-6 /°C 7.1 7.2 7.8 6.7 7.1 7.8
25-1000°C 10-6 /°C 7.4 7.7 8.1 7.4 8.1 8.0
Thermal Conductivity 20°C W/m°K 24 26 28 28.6 20 25
Electrical
Dielectric Strength 2.5mm tk ac-kv/mm 9.2 9.2 10 30 20 20
Dielectric Constant 1 MHz - 9.0 9.4 9.7 9.8 9.0 9.2
Volume Resistivity 20°C Ohm-cm >1014 >1014 >1014 >1014 >1014 >1015
300°C Ohm-cm 109 109 1010 1012 nd nd
1000°C Ohm-cm 106 106 106 107 nd nd
Loss Tangent 1 MHz - 0.028 0.012 0.009 0.0015 0.0003 0.0002
Dissipation Factor 1 MHz - 0.0003 0.0002 0.0001 - - -
Electrical IP,DP,CIM,SC,EX TC IP
IP= Isopress DP= Dry press SC= Slip cast CIM= Ceramic injection molding TC= Tape cast EX= Extrusion

 
  Chemical names and formulas:      
       
  formula  Al2O3      
  name  aluminum oxide      
  IUPAC name  oxo-oxoalumanyloxyalumane      
  alternate names  alumina | keto-ketoalumanyloxy-alumane |      
     oxo-oxoalumanyloxy-alumane |      
     oxo-oxoalumanyloxyalumane      
  mass fractions  Al (aluminum) 52.9% | O (oxygen) 47.1%      
           
  Structure Diagram      
       
           
  Basic Properties        
  Molecular Weight  101.9613 g/mol      
  Phase  solid (at STP)      
  Melting point  2040° C      
           
  Thermodynamic properties      
  Specific heat of fusion  1.09 kj/g      
           
  Chemical identifiers      
  GAS number  1344-28-1      
  PubChem CID  14769      
           
  Toxicity properties        
  Odor odorless      
  Short-term exposure limit  20 mg/m3      
           
           

 
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