| Microstructural Evolution during the Early Stages
of Sintering of Alumina Powder Compacts |
R. BHAT AND S. K. Rov
Pages : 1-5
DOI : 10.1080/0371750X.1990.10822975 |
| Abstract |
| The fundamental characteristics of the early stages of sintering in
alumina powder compacts have been studied. Two different alumina
materials having medium particle sizes of 0.8 and 3.5 microns have
been used. In conjunction with densification data, the techniques of
BET surface area analysis and mercury porosimetry have been used
to analyse the progress of sintering process in alumina between 1050°
and 1350°C.
Reduction in surface area with increasing temperature was more
rapid in compacts of ftne particles than in the other. The particle
packing was inhomogeneous in the fine powder specimens; it was
homogeneous in the coarse powder samples and pore size distribution
was sharp. Non-uniform sintering in the compacts of fine powders
occurred 'as a consequence of broad and multi-modal porosity distribution
in the green specimens. Pore growth was observed, which
possibly occurred as a result of coalescence of small pores. |
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