Abstract
AbstractSol-gel coatings were deposited on copper foil specimens by the sol-gel method and were subsequently treated at room temperature with air and argon plasma respectively. After a 1 h exposure to a thermoxidative atmosphere in a furnace at 400 to 500°C the coated specimens treated for longer times with either air or argon plasma, showed no change in colour or weight losses, whereas the untreated coated specimens and the uncoated specimens formed black oxidised layers which easily flaked off and gave rise to weight losses of ∼8-9%. Transmission electron microscopic examinations of sol-gel coatings on polyethylene terephthlate films, treated with air and argon plasma under the same conditions, revealed the formation of a densified outer layer, ∼30 nm thick, which resulted from the sintering action of the plasma treatment.
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