ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
At temperature above 1200°C, the thermal stability of α-SiAlON phases has beendebated since 1992; however, it has been discussed if any α-SiAlON phase can be formed in Ce,La, Eu and Sr-doped SiAlON systems. In our previous studies it was shown that the use of Mg-Ceand Mg-Sr elements as dopants SiAlON compositions, in which all elements just have very low orno stability in the α-SiAlON structure, would promote the stability of Mg-Ce elements in the α-SiAlON phase [1, 2]. However, in Mg-Sr systems, it was obtained that Mg2+ is predominantlyincorporated in α-SiAlON structure whereas Sr2+ mainly remains in the grain boundaries [2]. In thisstudy, by applying spark plasma sintering (SPS) (at 1400-1700°C) and post-sintering thermal heattreatment (at 1500°C for 5 hrs and 1700°C for 2hrs) Mg or Mg-Sr doped SiAlON (50:50 moleratios) ceramics were prepared. The results were compared with GPS sintered samples data. Theeffect of sintering temperature on densification process, phase transformation, microstructure andmechanical properties of samples were investigated. The results showed that by using SPS, Sr-Mgdoped samples can be sintered at lower temperature (at 1600°C) than at GPS (at 1800°C) and it hasno Sr-doped grain boundary phases
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.554.95.pdf
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