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:
High thermal conductive Si3N4 is a promising candidate for producing high quality ceramicsubstrates used in vehicles. Although a lot of researches have been carried out on the tape casting of Si3N4,they were mainly restricted in fabricating thin films with a thickness less than 200μm which are notsufficient for producing substrate. With larger thickness, tapes tend to crack during drying. In this work,slurry of α-Si3N4 with Y2O3-MgO as additives was prepared using an azeotropic mixture ofmethylisobutylketone/methyehtylketone/cyclohexanone as media. To obtain thick green tapes, theamount of dispersant, binder and plasticizer in the slurry were optimized, and the effects of dryingtemperature on the cracking behavior of the tape were studied. By controlling the composition of theslurry and the drying conditions, thick green tapes with thicknesses up to 1.8mm were successfullyfabricated, and Si3N4 substrates were produced after subsequent gas-pressing sintering, which were flatand had a relative density as high as 98.2%
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.875.pdf
