Particle-Filled PHPS Silazane-Based Coatings on Steel

摘要

Precursor-based composite coatings were developed as barrier coatings on steel against oxidation and corrosion using a silazane in the system SiN as a polymer material and BN particles as a passive filler. After thermal treatment in air up to 800℃, dense and very well adhered ceramic composite SiNO/BN coatings with a thickness of 12 μm were achieved. These were investigated by means of scanning electron microscopy, energy-dispersive spectrum, glow discharge optical emission spec-troscopy, and adhesion measurements. Static oxidation tests on coated mild steel substrates up to 700℃ displayed parabolic oxidation kinetics and a reduced weight gain by two orders in magnitude compared with uncoated substrates.