Digitale Medien
s.l. ; Stafa-Zurich, Switzerland
Advances in science and technology
Vol. 45 (Oct. 2006), p. 857-862
ISSN:
1662-0356
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Allgemeine Naturwissenschaft
,
Technik allgemein
Notizen:
Microwave (MW) processing is advantageous for processing ceramics with tailoredmicrostructures. Its combination of volumetric heating, a wide range of controlled heatingrates, atmosphere control and the ability to reach very high temperatures allows processingof 'difficult' materials like high thermal conductivity AlN and AlN composites andmicrostructure control in more readily sintered ceramics such as ZnO. MW sinteringpromotes development of thermal conductivity in AlN (225 W/mK) and its composites (upto 150W/mK inAlN-TiB2 and up to 129 W/mK in AlN-SiC when solid solution is avoided).In ZnO, heating rate controls sintered grain size. Increasing the heating rate from 5°C/min.to 4900°C decreases grain size from ~10 μm (comparable to conventional sintering of thesame powder) to nearly the starting particle size (~ 1μm). Microstructural uniformityincreases with sintering rate since ultra-rapid MW sintering minimizes the development ofthermal gradients due to heat loss
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.857.pdf
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