Plachký, T. ; Lenčéš, Z. ; Hric, Ľ. ; Šajgalík, P. ; Baláž, P. ; Riedel, R. ; Kleebe, H.-J. (2010)
Processing and mechanical properties of Si3N4 composites employing polymer-derived SiAlOC as sintering aid.
In: Journal of the European Ceramic Society, 30 (3)
doi: 10.1016/j.jeurceramsoc.2009.08.014
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Silicon nitride ceramics have been densified with polymer-derived SiAlOC sintering aid. Dense samples were prepared at relatively mild temperatures (1600 °C) from blends with 30 wt.% of pyrolysed SiAlOC additives. Decreasing the SiAlOC aid content to 15 wt.% resulted in porous Si3N4 samples (∼85% rel. density). The properties of dense samples were influenced by the remaining SiAlOC glass (HV = 15.5 GPa, KIC = 4 MPa m1/2). Increasing the sintering temperature to 1780 °C for 5 min significantly changed the phase composition and properties of the composites. The major phase was O′-sialon in the sintered samples. Additional annealing of the samples at 1530 °C for 16 h further decreased the amount of the residual glassy phase and consequently affected the mechanical properties. The Vickers hardness of dense samples was 18.5 GPa and the fracture resistance ranged between 4.0 and 4.5 MPa m1/2. The compressive creep test (1400 °C/100 MPa/24 h) of the SNA30-A sample sintered at 1600 °C for 30 min without an additional crystallisation step showed a promising low creep rate of 8.6 × 10−8 s−1. Further improvement of creep resistance is expected for the crystallised samples.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2010 |
| Autor(en): | Plachký, T. ; Lenčéš, Z. ; Hric, Ľ. ; Šajgalík, P. ; Baláž, P. ; Riedel, R. ; Kleebe, H.-J. |
| Art des Eintrags: | Bibliographie |
| Titel: | Processing and mechanical properties of Si3N4 composites employing polymer-derived SiAlOC as sintering aid |
| Sprache: | Englisch |
| Publikationsjahr: | Februar 2010 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 30 |
| (Heft-)Nummer: | 3 |
| DOI: | 10.1016/j.jeurceramsoc.2009.08.014 |
| URL / URN: | https://www.sciencedirect.com/science/article/pii/S095522190... |
| Kurzbeschreibung (Abstract): | Silicon nitride ceramics have been densified with polymer-derived SiAlOC sintering aid. Dense samples were prepared at relatively mild temperatures (1600 °C) from blends with 30 wt.% of pyrolysed SiAlOC additives. Decreasing the SiAlOC aid content to 15 wt.% resulted in porous Si3N4 samples (∼85% rel. density). The properties of dense samples were influenced by the remaining SiAlOC glass (HV = 15.5 GPa, KIC = 4 MPa m1/2). Increasing the sintering temperature to 1780 °C for 5 min significantly changed the phase composition and properties of the composites. The major phase was O′-sialon in the sintered samples. Additional annealing of the samples at 1530 °C for 16 h further decreased the amount of the residual glassy phase and consequently affected the mechanical properties. The Vickers hardness of dense samples was 18.5 GPa and the fracture resistance ranged between 4.0 and 4.5 MPa m1/2. The compressive creep test (1400 °C/100 MPa/24 h) of the SNA30-A sample sintered at 1600 °C for 30 min without an additional crystallisation step showed a promising low creep rate of 8.6 × 10−8 s−1. Further improvement of creep resistance is expected for the crystallised samples. |
| Freie Schlagworte: | Precursor-organic, Composites, Creep, Spectroscopy, Oxynitrides |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 11 Apr 2012 11:32 |
| Letzte Änderung: | 16 Aug 2021 12:27 |
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