Abstract
The synthesis of submicron Al 2O 3-SiC composite powders from carbon coated SiO 2/Al mixture was investigated. Two different types of precursors which are carbon coated SiO 2/Al mixture and standard mixture SiO 2, AI and carbon black were prepared to compare formation of the composite powders. The effect of temperature (1200-1500°C) on the formation of the powders was studied in flowing inert gas. Al 2O 3-SiC composites were characterized using X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analyzer and transmission electron microscopy (TEM). The coating of SiO 2/Al mixture significantly changed the mechanism of the reaction and produced high quality nano-size Al 2O 3-SiC powders. XRD and BET results showed that precursors synthesized at 1300°C for 2 hours had only Al 2O 3 and SiC phases and had high surface area about 36m 2/g, respectively. TEM results showed that the produced Al 2O 3-SiC powders had fine particles, narrow particle distribution, and freely agglomerated.
| Original language | English |
|---|---|
| Pages (from-to) | 123-127 |
| Number of pages | 5 |
| Journal | Ceramic Transactions |
| Volume | 166 |
| State | Published - 2005 |
| Externally published | Yes |
| Event | 106th Annual Meeting of the American Ceramic Society - Indianapolis, IN, United States Duration: Apr 18 2004 → Apr 21 2004 |