| Study on Utilization of Neyveli Clay in the
Production of Value Added Ceramics |
V. Viswabaskaran, F. D. Gnanam and M. Balasubramanian
Pages : 93-97
DOI : 10.1080/0371750X.2002.10800034
|
| Abstract |
| The present study deals with the utilization of Neyveli clay
for value added artifacts like, porous membrane support,
dense mullite tubes and substrates for electronic applications.
In the present i Stigation, Neyveli clay and reactive
alumina (mean particle size of 0.7 IJm) were used as starting
materials to prepare stoichiometric mullite. MgO (3 wt%)
and boehmite (5 wt%) were added as sinter additives to
increase the densification, whereas starch and 820 3 were
added as pore formers. The sintered (16ooac for 3 h) porous
membrane supports show that the addition of organic pore
former (starch) leads to low strength with a wide pore size
distribution. The simultaneous addition of organic (10 wt%)
and inorganic pore formers (1 0%) to the clay and alumina
yields porous membrane supports with high strength (61
MPa) and high open porosity (35%) having mean pore
diameter of 5 IJm with very narrow pore size distribution.
The linear thermal expansion co-efficient (3.4 x 1 o-sac-1 at
400°C) and dielectric constant (7.4) are comparable to the
reported values for samples containing 3% MgO. Dense
tubes prepared with the addition of 3% MgO give bulk density
of 2.91 g.cm-3
, strength of 78.2 MPa without any open porosity. |
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