ISSN:
1013-9826
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:
In this study, porous Si3N4 ceramics were fabricated by carbothermal reduction reactionbetween silicon dioxide and carbon. The influences of different starting powders and sintering additiveson microstructure and mechanical properties were investigated. XRD analysis demonstrated the formationof single-phase β-Si3N4 except for glass phase and minor of α-Si3N4 phase. SEM analysis showedthat the resultant porous Si3N4 ceramics occupied fine microstructure and uniform pore structure. Thesamples with fine starting powder showed fine, high aspect ratio of β-Si3N4 grains and good mechanicalproperties. The addition of Al2O3 accelerated the densification of porous Si3N4 ceramics. With anincreasing in the sintering additive content, the porosity decreased, the flexural strength increased
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1105.pdf
