The crystallization of the nanometersized amorphous ceramic powders by ball milling
Conference
·
OSTI ID:215207
- National Key Lab. for RSA, Shenyang (China); and others
The nanometersized amorphous Si{sub 3}N{sub 4} and Si-N-C powders are subjected by high-energy ball milling in order to induce a crystallization process. It was found that after initial 4 seconds of milling a-Si{sub 3}N{sub 4} may rapidly crystallize into a mixture of {alpha}-Si{sub 3}N{sub 4} and {beta}-Si{sub 3}N{sub 4} whereas amorphous Si-N-C powders remain in the amorphous state. These results cannot be interpreted with the local effective temperature rise at the collision sites and the increase of the impurity levels which drive the crystallization. The observed structural changes occurring in a-Si{sub 3}N{sub 4} can be attributed to the mechanical deformation which alters the bonding nature of a-Si{sub 3}N{sub 4}. It was concluded that ball milling is an effective tool to induce the crystallization of some amorphous metallic systems.
- OSTI ID:
- 215207
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
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