Polysilazane (PSZ) is a class of inorganic-organic hybrid polymers with silicon and nitrogen as the main chains, combining the high-temperature stability of ceramic materials and the processability of organic polymers. In recent years, its application in the field of coatings has attracted significant attention, particularly exhibiting unique advantages in high-temperature resistance, corrosion prevention, wear resistance, and functional coatings.

1.High-Temperature Protective Coatings
Polysilazane can be converted into Si₃N₄ or SiCN ceramic phases at high temperatures, endowing coatings with excellent heat resistance (up to over 1000°C). For example, engine components in the aerospace industry often need to withstand extreme temperatures, and traditional organic coatings are prone to decomposition. In contrast, polysilazane coatings can form a dense ceramic film through cross-linking and curing, effectively isolating oxygen diffusion and delaying the oxidation of metal substrates. Research has shown that the oxidation rate of titanium alloy treated with polysilazane is reduced by over 70% at 800°C.
2.Corrosion Prevention and Chemical Stability
The dense Si-O-Si and Si-N network structures formed after the curing of polysilazane can block the penetration of corrosive media such as moisture and chloride ions. In marine environments, there is an urgent need for corrosion prevention of ship steel structures, and polysilazane coatings exhibit better salt spray resistance (>5000 hours) than epoxy resins. Additionally, their acid and alkali resistance make them promising for the inner wall protection of chemical equipment.
3.Wear Resistance and Surface Functionalization
By doping with nanoparticles (such as Al₂O₃, SiC), the hardness and wear resistance of polysilazane coatings are significantly improved, making them suitable for easily worn parts such as mechanical bearings and cutting tools. Meanwhile, their low surface energy characteristics can derive hydrophobic coatings (contact angle >110°), which can be applied to self-cleaning building glass or anti-icing of transmission lines.
4.Process Advantages and Environmental Friendliness
Polysilazane coatings are usually applied in solvent-based or UV-curable forms, with low curing temperatures (room temperature - 200°C), suitable for heat-sensitive substrates such as plastics. Compared with traditional chromium-containing coatings, their heavy-metal-free nature complies with environmental regulations, such as the EU REACH standard.

Challenges and Prospects
Despite the promising prospects, the high cost of polysilazane (about 3-5 times that of epoxy resin) and the susceptibility of the curing process to humidity are challenges. Future research will focus on low-cost modification (such as introducing organosilicon segments) and process optimization to expand its applications in emerging fields such as new energy battery coatings and flexible electronics.

In conclusion, polysilazane coatings, with their multifunctionality, are gradually becoming an important choice for high-end protective and functional coatings, driving the development of coating technology towards high performance and environmental friendliness.

Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150K.       
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.