| Studies on Development of Alumina Substrates |
A. K. KULKARNI, D. D. UPADHYAYA AND S. V. K. RAO
Pages : 25-28
DOI : 10.1080/0371750X.1982.10822566 |
| Abstract |
| High alumina ceramics are used as insulating materials in high
voltage electrical application. Thin plates of alumina ( ~ 1 mm) are
found highly suitable in miniaturised electronic systems. They exhibit
excellent dielectric properties along with high electrical resistivity
and high thermal shock resistance and mechanical strength.
Initial investigations were carried out for the development of high
alumina substrates with alumina content above 90% with a view to
get complete vitrification at commercially attainable temperatures in
the range 1400°-1500°C. The data presented include the properties
like porosity, density, dielectric loss, dielectric constant, microstructures
of as-fired surface and the surface characteristics of the substrates
developed. The influence of various compositions and sintering
treatments on surface characteristics has been studied by SEM. |
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