Sinterable powders from laser driven reactions : annual report
Extremely fine, uniform ceramic powders were synthesized from laser heated gas phase reactions. Resulting Si, Si N4 and SiC powders have been characterized in terms of parameters wich are important for densification processes. They are virtually ideal. The spherical particles typically have...
| Main Authors: | , , |
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| Format: | Technical Report |
| Language: | en_US |
| Published: |
MIT Energy Laboratory
2006
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| Subjects: | |
| Online Access: | http://hdl.handle.net/1721.1/35189 |
| Summary: | Extremely fine, uniform ceramic powders were synthesized from laser heated
gas phase reactions. Resulting Si, Si N4 and SiC powders have been
characterized in terms of parameters wich are important for densification
processes. They are virtually ideal. The spherical particles typically have
mean diameters from 120 to 1000 A. The standard deviation is typicaliy
25-45% and the diameter of the largest observed particle is typically less
than twice that of the smallest particle. Purities are extremely high.
The laser heated process has been modeled in terms of fluid flow and heat
transfer criteria. Many fundamental property measurements were made to
provide data for these calculations. The process is extremely efficient;
X 95% of the SiH4 is reacted in a single pass through the laser beam and
approximately 2 kwhr. of energy are required per kilo of Si3N4. |
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