期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 32, 期 7, 页码 1337-1342出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2011.05.016
关键词
Si3N4; SiAlON; Sintering; Microstructure-final; Fluoride
资金
- Scientific and Technological Council of Turkey (TUBITAK) [108M461]
SiAlONs are silicon aluminium oxynitride ceramic materials with a range of technically important applications, from cutting tools to specialised refractories and the properties of SiAlONs can be tailored for specific purposes. In this study, different beta-SiAlON compositions were prepared using fluoride (MgF2 as fluorine source plus Y2O3) and oxide (MgO plus Y2O3). These compositions were pressureless sintered under nitrogen atmosphere in the range of 1450-1750 degrees C for 0.5-2.5 h for comparison of densification behaviour and mechanical properties. Densities of samples were measured and analyses of result products were carried out using SEM and XRD. The F-doped sintered beta-SiAlON ceramics showed better densities and less pore micrographs especially at lower temperatures compared with the fluorine free samples. Full densifications were achieved for beta-SiAlON ceramics with fluoride addition at 1700 degrees C for 60 min. Consequently, fluorine addition to additive system has a good effect on mechanical properties and densification behaviour. (C) 2011 Elsevier Ltd. All rights reserved.
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