Auger electron spectroscopy of metallic film/laser-irradiated alumina couples
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
- Martin Marietta Energy Systems, Oak Ridge, TN (United States)
Auger Electron Spectroscopy (AES) was employed to study metal/ceramic interfaces. Adhesion pull testing showed that a strong bonding between metallic films and alumina substrates is obtained when alumina is laser-irradiated in an oxygen atmosphere before deposition and, after deposition, the couple is annealed at 300 c for 1 h. On the other hand the gold/alumina bonding is extremely weak when laser-irradiation of the substrate is performed in argon-4% H{sub 2}. Fresh surfaces were exposed for AES at several distances from the metal/ceramic interface by sputtering the specimens in situ after each analysis. In the region of the interface the sputtering rate was slower than in the film in order to minimize any spurious effect due to ion beam bombardment. AES of a gold/alumina couple prepared in this way reveals that the Auger peaks of gold from the film and oxygen and aluminum from the alumina substrate, when the substrate was irradiated in oxygen atmosphere, shift by {approximately} 1.5 eV, 1.6eV, and 1.4eV respectively when the analysis area encompasses the metal/ceramic interface. On the other hand, no shift of the Auger peaks are observed at the interface when the laser-irradiation was performed n argon-4%H{sub 2}. In the case of copper deposited on alumina laser-irradiated in an oxygen atmosphere, an interfacial compound is formed. This compound is a double oxide of aluminum/copper or two separated oxides, and promotes strong copper/alumina bonding.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 94037
- Report Number(s):
- CONF-941144--; ISBN 1-55899-258-8
- Country of Publication:
- United States
- Language:
- English
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