| Alumina Bodies for Electrical Applications |
P. Y. DALVI, D. D. UPADHYAYA, A. K. KULKARNI
AND S. V. K. RAO
Pages : 49-52
DOI : 10.1080/0371750X.1986.10822784 |
| Abstract |
| Alumina bodies have been prepared from commercially available,
technical grade alumina. Effects of processing parameters and additions
like clay, pyrophyllite and magnesium carbonate on densification
have been studied in the range of 1500°-1800°C with a view to
the utilization of these compositions for electrical applications.
The bodies have been evaluated for microstructures and electrical
properties at room temperature for 20 MHz. It was observed that
alumina bodies containing 91-93% Al20 3 densified to the extent of
3.4-3.5 gm.cm-3 with imperviousness at 1500° to 1600C. Bodies
containing pyrophyllite exhibited dissipation factor as low as 0.0002
along with dielectric constant (K), in the range 6-7, while bodies
containing alumina over 97% had a dissipation factor as low as
0.0001 having K in the range 7-8 when densities of these bodies
exceeded 3.6 gm.cm-• and open porosity decreased below 1 %. |
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