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Structure of Ceramic Pyrometry Tubes Typical & Chemical PropertiesDuralox 997 Re-crystallised Alumina Ceramic DIN Standard 40680 Medium Class
 
Typical & Chemical Properties
Property Material
Units
Duralox 997
Chemical Composition  
Al2O3 : 99.7%
Alkali : 0.05%
Colour  
Creamish
Density
gm/cc
3.85-3.90
Porosity  
Nil
Hardness
(Vicker's)
(Moh's)
HV10
1550-1600
9+
Flexural Strength
Kg/cm2
3000
Young's Modulus
X 10-6 kg/cm2
3.5
Coefficient of linear thermal expansion (25-1000°C)
X 10-6 / °C
8
Thermal Conductivity (25°C)
W/m°K
26
Max. working temp. in oxidizing atmosphere @ no load
°C
1800+
Dielectric strength (25°C) (1.5mm thick)
KV/mm
25
Volume Resistivity (25°C)
Ohm.cm
1014
Thermal shock resistance
°C
Good
(170°C)
120-170°C
 
Chemical Characteristics
   
In Vacuum
Reacts with carbon at about 1650°C
Reacts with zirconia at about 1800°C
Reacts with magnesia at about 1900°C
Reacts with thoria at about 1990°C
Reacts with beryllia at about 1860°C


In Oxidising Atmosphere
Reacts with magnesia at about 1600°C
Reacts with zirconia at about 1700°C
Reacts with thoria at about 1900°C
In Inert Atmosphere
No reaction with molybdenum at 1800°C
No reaction with nickel at 1800°C
Slight reaction with niobium at 1600°C
Violent reaction with niobium at 1800°C
Slight reaction with titanium at 1600°C
Violent reaction with titanium at 1800°C
Slight reaction with beryllium at 1800°C
Slow reaction with silicon at 1400°C
Violent reaction with silicon at 1600°C
Slow reaction with zirconium at 1600°C
Violent reaction with zirconium at 1800°C
 
         
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