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Coatings can be applied like normal wall paint by brushing, spraying or dipping. The following notes may help to obtain best results with the application and the subsequent high temperature use:

Preparation of the surfaces: The surfaces to be coated should be free of dust, grease, loose coating particles, melt adhering and oxide skins. Smooth surfaces (e.g. steel) may be roughed by grit blasting in order to enable a better adhesion of the coatings.

Preparation of the coatings: Coatings should be agitated or shaked carefully in order to distribute the solids of the suspension evenly. For brushing the coatings can be used in the as received consistency, whereas a dilution with the respective carrier liquid is necessary for spraying or dipping.

Brushing: Most coatings are best applied in thin layers (max. 100µm) by using a soft brush. Coating must be carefully dried between the individual application steps. Further layers must be laid on with fast brush strikes in order to avoid damaging the already applied layers.

Dipping: Small components such as laboratory crucibles can be coated also by dipping. For this the coating must be diluted, the respective dilution ratio must be determined by tests. Usually one layer only can be applied by dipping. If cracks appear in the coating during the following drying or the coating tend to peel off, it must be further diluted.

Spraying (compressed air): The diluted coating may be applied by a blowing cup or better with a paint spray gun using a nozzle with 1 to 1.5mm Ø and a pressure of 6-8 bar. A distance of 2 - 40 mm should be kept. Before the application of further layers the coating must be dried in order to avoid cracking and peeling of the coating.

Spraying (Airless): Most coatings can be sprayed using airless spraying equipment in the original consistency or with a very small dilution. Here the coating is pressed with pressure through a nozzle. However the danger of a too thick coating application exists with cracks forming during drying.

 

 


© 2015 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst


These recommendations are believed to be correct. However, no guarantee of their accuracy is given. Therefore, purchasers shall make their own tests to determine suitability for their use. These products are offered for industrial and related uses (e.g. research and development) only. However the user must take the necessary precautions appropriate for products containing chemicals. This description does not imply the absence of any patents, the responsibility whatsoever solely rests with the user.

Application procedures - Boron-Nitride-Coatings

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