Porosity and Shrinkage Behaviour of Silicon Nitride Compacts

Partially sintered compacts of Si-Al-Y-O-N batches with 12 wt.% inorganic additives as sintering aids were studied by mercury porosimetry in dependence on its thermal pretreatment. Data interpretation was complicated by strong hysteresis phenomena, caused by so-called "ink-bottle" pores, w...

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Bibliographic Details
Published in:Key engineering materials 1993-10, Vol.89-91, p.197-202
Main Authors: Ebert, W., Röhl-Kuhn, B., Rabe, Torsten, Buchholz, M., Linke, Dietmar
Format: Article
Language:English
Online Access:Get full text
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Summary:Partially sintered compacts of Si-Al-Y-O-N batches with 12 wt.% inorganic additives as sintering aids were studied by mercury porosimetry in dependence on its thermal pretreatment. Data interpretation was complicated by strong hysteresis phenomena, caused by so-called "ink-bottle" pores, which remain occupied by mercury, when the applied pressure is released. One has to consider also different chemical reactions occurring between the batch components at heating-up. The influence of nitrogen overpressure on the shrinkage behavior was studied for 3 different batches. In opposite to low-additive silicon nitride material, here the actual porosity of the samples at the point of pressurization-up to 5 MPa-does not influence its weight loss and final density.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.89-91.197