The process of polysilazane coating technology has been iterated to meet the surface protection requirements of various substrates.

Polysilazane, as an inorganic precursor material, has continuously expanded the technological boundaries in the surface protection field due to its unique ceramic-forming properties. It is suitable for various substrates such as metals, ceramics, and carbon fibers, providing new options for the anti-corrosion and anti-oxidation solutions of high-end equipment.


1. What are the special characteristics of the film formation principle?
The main chain of polysilazane molecules contains Si-N bonds. It undergoes cross-linking and curing under conditions such as moisture, heating, or catalysis. Subsequent high-temperature cracking can convert it into ceramic phase structures such as SiCN and Si₃N₄. Unlike organic silicon coatings, the final product is an inorganic ceramic film, and there is no problem of organic components' failure due to high-temperature decomposition.


2. Distinctions in construction points for different substrates
For metal substrates, sandblasting and oil removal pre-treatment should be carried out first to enhance the coating adhesion; for carbon fiber composite materials, a higher curing temperature should not be used to prevent damage to the substrate; for ceramic substrates, the surface has many pores, and it is recommended to do a primer sealing treatment first to avoid the penetration and consumption of the coating.

3. Frequently Asked Questions by Customers
Q1: What causes the coating to crack?
A: The main reasons are that the coating is applied too thickly at one time, the heating rate is too fast, or the thermal expansion coefficients of the substrate and the coating do not match. It is recommended to apply thinly and in multiple layers, and control the heating gradient.


Q2: What is the appropriate thickness for the coating?
A: The single-coat thickness of the conventional protective coating is controlled at 2–8 μm. For multiple layers and thick coatings, the layer interval should be extended for storage time.


Q3: How is the acid and alkali resistance of the coating?
A: The fully decomposed ceramic layer has excellent resistance to acid and alkali corrosion. The semi-finished product layer that is not fully cured is not resistant to strong corrosive media.


4. Development Direction of the Industry
Low-shrinkage polysilazane formulations have become the focus of research, reducing the cracking risk during thick coating; the continuous improvement of dedicated diluents and catalyst systems has lowered the on-site construction threshold for downstream customers, promoting the material from the small-scale sample stage to batch coating application.