2022-12-18

Aluminum Oxide Protective Layer

Aluminum oxide protective layer is a layer which is applied on aluminium metal, preventing it from being degraded by water, heat, oxygen or chemicals. It is a layer which can be made using known thin layer deposition techniques.

In order to obtain sufficient mechanical and thermal stability, the thickness of the coating layer should be selected to ensure its adequate performance. As long as the layer is thick enough, it can be applied by any one of the known thin layer deposition methods.

The protective layer can be applied by electrophoretic deposition, spraying, sputtering or electrochemical deposition. The outer layer can be a ceramic material, a metal alloy or a semi-metal. The inner layer can be a semiconductor or an electrically conductive ceramic. The ratio of the coating material to the glass can be anywhere from 5 to 90% by weight.

In order to enhance the operational life of zeolites, the application of aluminium oxide protective layer in adsorbers is recommended. In the first step, the adsorbents are loaded into the adsorbers. The adsorbents are then matched to the specific gas requirements for the process. The protective layer is then loaded into the adsorber. In this way, the adsorbent is kept in a good state for a longer period of time. The adsorption factor is increased for aluminium oxides modified with alkali metal cations.

The protective layer prevents corrosion of the metal by water, oxygen and carburizing atmospheres. The layer is formed by coating a metal with a ceramic material, such as alumina, titanium, antimony, Germanium, or tellurium. The metal can be dissolved in the ceramic, or it can be mixed.

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