Spark Plasma Sintering of Al2O3–SiC Ceramics. Study of the Microstructure and Properties
The features of spark plasma sintering of submicron Al 2 O 3 powders with different contents (0, 0.5, 1.5, 5 vol %) of β-SiC nanoparticles have been studied. The microstructure and hardness of Al 2 O 3 + 5 vol % SiC ceramics obtained by sintering Al 2 O 3 powders with β-SiC particles of various type...
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Veröffentlicht in: | Technical physics 2024-02, Vol.69 (2), p.148-159 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The features of spark plasma sintering of submicron Al
2
O
3
powders with different contents (0, 0.5, 1.5, 5 vol %) of β-SiC nanoparticles have been studied. The microstructure and hardness of Al
2
O
3
+ 5 vol % SiC ceramics obtained by sintering Al
2
O
3
powders with β-SiC particles of various types (nanoparticles, submicron particles, fibers) have been studied. Sintering was carried out at heating rates (
V
h
) from 10 to 700°C/min. The sintering process of Al
2
O
3
+ SiC ceramics with low heating rates (
V
h
=
10–50°C/min) has a complex three-stage character, with a flat area in the temperature range of 1200–1300°C. At high heating rates (
V
h
>
250°C/min), the usual three-stage character of sintering is observed. The analysis of temperature dependences of compaction was carried out using the Young–Cutler model; it was found that the kinetics of powder sintering is limited by the intensity of grain boundary diffusion. It is shown that the dependence of the hardness of Al
2
O
3
+ SiC ceramics on
V
h
has a nonmonotonic character, with a maximum. In the case of pure alumina, an increase in
V
h
leads to a monotonic decrease in hardness. |
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ISSN: | 1063-7842 1090-6525 |
DOI: | 10.1134/S1063784224010055 |