Open Access

Table 1.

Compositions and properties of Alumina (Al2O3) ceramic used for experimentation.

Material type Recrystalised Alumina
Percentages of compositions
Alumina (Al2O3) 99
Silica (SiO2) 0.7
Magnesia (MgO) 0.07
Iron oxide (Fe2O3) 0.07
Sodium oxide, Calcia Rest
Volume density gm/cc 3.85
Apparent porosity % Nil – 0.1
Expansion coefficient 20–1000 °C 8.4 × 10−6/°C
Melting point 2000 °C
Limit of use 1900 °C

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