科研之友
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摘要
Nanoparticles offer many advantages in the manufacture of ceramic products concerning processing and final properties, but are still difficult to process, and not all ceramic powder compositions can be obtained commercially like, e.g., alpha-alumina. In this paper, the production of alpha-alumina nanosized particles with a median size < 60 nm by a wet grinding process in a highly concentrated suspension of up to 49 wt% solid content starting from a commercial microsized powder is presented. Furthermore, the subsequent direct processing of these suspensions to ceramic green tapes via tape casting is performed. The effect of nanosized alpha-Al2O3 powders on the viscosity of slurries, the casting process, binder burnout, and sintering behavior is characterized. Flat and crack-free sintered substrates with a density > 95%TD, a submicrometer microstructure, and a translucent appearance could be obtained. A decrease of the sintering temperature, an improvement of the mechanical strength, and a lower surface roughness were achieved through the use of nanoparticles compared with particles in the micrometer size range.
- 出版日期2010-5
