ISSN:
1662-9752
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
In this work, β-sialon ceramics were prepared from high-aluminium fly ash viacarbothermal reduction-nitridation (CRN) and the physicochemical properties of the materials such asbulk density, apparent porosity, water absorption and flexural strength were also discussed. Theresults showed that the percentage of β-sialon phase in the product decreases as the temperatureincreases from 1400°C and the weight of the sintered specimen experienced an increase during1350°C~1450°C due to the nitridation reactions, and followed by a gradual decrease till 1550°C forthe decomposition of β-sialon. It is indicated that the optimum sintering temperature to obtain thehighest yield of β-sialon ~93% lies in 1400°C~1450°C. The SEM images revealed that the preparedβ-sialon sintered at 1400°C were mainly in shape of elongated prisms, typically ~5μm in length and0.5~1μm in width. As the temperature increased to 1500°C and above, β-sialon decomposed and thenew phases of SiC and AlN were formed at 1550°C as confirmed by XRD
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.587.pdf
