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, we propose a new process to fabricate electrically conductive alumina bygelcasting and reduction sintering. The process used the conventional gelcasting method except forvarying amounts of monomer at 2.8, 5.5, and 8.0 wt.% relative to the weight of the slurry. In the plasticmould, the slurry was under in situ solidification for 3 hrs at 25oC to achieve gelation. The freshly gelledbodies were demolded, carefully dried, and then sintered at 1100oC, 1300oC, and 1550oC in nitrogenatmosphere. The holding times at 1100oC and 1300oC was 2 hours, while at 1550oC were 2, 4, and 6 hrs.The sintered alumina body was characterized by electrical property, X-ray diffraction, and scanningelectron microscopy. Results showed that monomer additions and sintering schedule significantly affectin lowering electrical resistance. The low value was 3.6×106 +cm at 8.0wt.% monomer addition andsintering at 1550oC for 2 hrs. The effect of physical properties on electrical conductivity and thecorresponding reaction mechanism were discussed in details
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.657.pdf
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