Abstract
The influence of sputtering conditions on the microstructure and mechanical properties of Al-O-N films was investigated using XRD, TEM and nano-indentation. The targets of sintered Al2O3 plate were sputtered in a mixture of argon and nitrogen using an r.f. sputtering apparatus of facing target-type sputtering. Nitrogen gas flow rate was controlled from 0 to 40 sccm under the fixed Ar gas flow rate (10 sccm). The substrate was heated up to ∼300°C. The highest hardness of 27 GPa was obtained for the Al-O-N film deposited at 300°C under 30 sccm of the nitrogen gas flow rate, which value is almost twice that of Al-O films.XRD and SAED analysis of Al-O-N films suggested the existence of some phases; hcp-AlN, AlON and ι-Al2O3 phase may presented in the film. The dark-field TEM images of the Al-O-N films revealed that the film consists of very fine grains of ∼6 nm in diameter.The Al-O-N film having the highest hardness has higher transparency of visible light than that of Al-O films. Even if the Al-O-N films was annealed up to 800°C for 1 hour in the air, mechanical properties were not changed, but decreased drastically after the annealing at 900°C.
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