Abstract
Abstract The synthesis of Al 2 O 3 condensates was carried out in a coaxial impulse plasma generator. A complex metal—ceramic (Al-Al 2 O 3 ) hot electrode functioned as the source of material. In some selected experiments a ceramic (Al 2 O 3 ) ring was used as an additional source of Al 2 O 3 (or AlO, Al, O) vapour. The impulse plasma was generated by discharging a 100–200 μF capacitor battery charged to a voltage of 3 kV. The plasma gas (O 2 or Ar) pressure was 15–30 Pa. As a result of the impulse plasma process, continuous ceramic coatings were condensed on non-heated Ni substrates. Surprisingly, the monotropic metastable Al 2 O 3 phases were the only phases found in the condenstate material (no stable α-Al 2 O 3 phase and/or Al occured even when argon was used as the plasma gas). This can be explained by the effect exerted by the surface pressure, which was as high as 0.4 GPa.
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