Preparation of moisture curable polysilazane coatings

Compared to neat polyorganosilazanes, blends with perhydropolysilazane revealed both higher curing rate and improved surface hardness. Polysilazane films of about 3 μm thickness coated on polycarbonate plates and cured at 50 °C in air of about 80% relative humidity for 1 h exhibited microhardness of about 450 N mm−2 compared to about 250 N mm−2 obtained for acrylate/silica nano-composite coatings. These findings point to dense polysilazane films what makes them very promising as coatings for technical applications, e.g., reduced gas permeability and improved corrosion resistance.