Galusek, D. ; Riedel, R. ; Balog, M. (2005):
Polymer-derived Al2O3-SiC nanocomposites: preparation route vs. microstructure.
In: FRACTOGRAPHY OF ADVANCED CERAMICS II Book Series: KEY ENGINEERING MATERIALS, 290, pp. 121-128. TRANS TECH PUBLICATIONS LTD, BRANDRAIN 6, CH-8707 ZURICH-UETIKON, SWITZERLAND, ISSN 1013-9826,
[Article]
Abstract
A polycarbosilane-based SiC-precursor with high ceramic yield (75 % by weight) was used for preparation of Al2O3-SiC nanocomposites. Two different ways of preparation of the composite were tested. First, the pre-sintered alumina matrix was vacuum infiltrated by the liquid precursor. Second, the alpha-alumina powder was coated with the polymer diluted in cyclohexane, the solvent was evaporated, and the powder was axially pressed at elevated temperature (350 degrees C) and 50 MPa pressure (warm pressing). The specimens were then heat treated under carefully controlled conditions in inert atmosphere (Ar), in order to facilitate the ceramisation of the precursor and outgasing of the pyrolysis products from the composite. The specimens were then either sintered or hot-pressed, in order to attain complete densification. The influence of the processing parameters (way of preparation, concentration of the polymer, parameters of sintering/hot-pressing) on the microstructure of the composite (grain size and grain size distribution Of Al2O3 matrix grains and SiC particles, fraction of inter- and intragranular SiC particles, presence of defects) is discussed with implications to the composites' way of preparation.
| Item Type: | Article |
|---|---|
| Erschienen: | 2005 |
| Creators: | Galusek, D. ; Riedel, R. ; Balog, M. |
| Title: | Polymer-derived Al2O3-SiC nanocomposites: preparation route vs. microstructure |
| Language: | English |
| Abstract: | A polycarbosilane-based SiC-precursor with high ceramic yield (75 % by weight) was used for preparation of Al2O3-SiC nanocomposites. Two different ways of preparation of the composite were tested. First, the pre-sintered alumina matrix was vacuum infiltrated by the liquid precursor. Second, the alpha-alumina powder was coated with the polymer diluted in cyclohexane, the solvent was evaporated, and the powder was axially pressed at elevated temperature (350 degrees C) and 50 MPa pressure (warm pressing). The specimens were then heat treated under carefully controlled conditions in inert atmosphere (Ar), in order to facilitate the ceramisation of the precursor and outgasing of the pyrolysis products from the composite. The specimens were then either sintered or hot-pressed, in order to attain complete densification. The influence of the processing parameters (way of preparation, concentration of the polymer, parameters of sintering/hot-pressing) on the microstructure of the composite (grain size and grain size distribution Of Al2O3 matrix grains and SiC particles, fraction of inter- and intragranular SiC particles, presence of defects) is discussed with implications to the composites' way of preparation. |
| Journal or Publication Title: | FRACTOGRAPHY OF ADVANCED CERAMICS II Book Series: KEY ENGINEERING MATERIALS |
| Volume of the journal: | 290 |
| Publisher: | TRANS TECH PUBLICATIONS LTD, BRANDRAIN 6, CH-8707 ZURICH-UETIKON, SWITZERLAND |
| Uncontrolled Keywords: | alumina, silicon carbide, organosilicon precursor, infiltration, warm pressing, microstructure |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences |
| Date Deposited: | 20 Apr 2012 11:13 |
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