The aluminum oxide ceramic coatings are widely used as wear and friction-resistant and insulation coatings. The atmosphere plasma spraying (APS) is a most used method for preparing alumina coating. Alumina coatings were made using low power plasma spraying. The powder was injected directly into the area between the cathode and anode in the plasma torch and the conveying gases were introduced into the plasma jet. The results show that the hardness of the aluminum oxide coatings applied using low-power plasma spraying and an internal injection system is higher than the coatings produced using APS with external injection. The plasma spray energy can be reduced by the internal feed powder system. Paper includes a German-language abstract.

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