1. High temperature environmental factors
Temperature level: The temperature that the coating can withstand has a certain limit. If it is exposed to an environment close to or exceeding its tolerance limit for a long time, the aging and decomposition rate of the coating will accelerate. For example, a coating rated to withstand 1000 ℃, if frequently used at temperatures of 1100 ℃ or even higher, will experience faster cracking, peeling, and other failures, greatly shortening its service life.
Frequency of temperature changes: Frequent temperature changes can cause thermal stress in the coating and substrate materials due to inconsistent coefficients of thermal expansion. When thermal stress is repeatedly applied, the coating is prone to defects such as cracking and warping, which can accumulate over time and cause the coating to detach from the substrate, making it unable to continue providing protection. Coatings used in some intermittent heating industrial furnaces are greatly affected by this.
2. Chemical environmental factors
Corrosive medium: If the high-temperature resistant coating is exposed to corrosive chemicals such as acid, alkali, salt spray, and oxidizing gases, these substances will react chemically with the coating and corrode it. For example, in chemical production, in high-temperature areas where acidic gases escape, coatings may be corroded by acidic substances, causing structural damage and reduced protective performance, thereby affecting their service life.
The concentration and contact time of chemical substances: The higher the concentration of corrosive chemicals in the environment, the more severe the corrosion of the coating, and the longer the contact time, the greater the cumulative destructive effect. For example, high-temperature resistant coatings used for a long time in high concentration salt spray environments will have a significantly faster failure rate compared to those used in low concentration environments.
3. Mechanical factors
Friction and wear: In some high-temperature environments with relative motion, such as coatings on the surfaces of components such as pistons and turbine blades in high-temperature engines, they will be subject to friction and wear. The coating is constantly worn and the thickness gradually decreases. When it is thinned to a certain extent, it can no longer provide effective protection, leading to the end of its service life.
External impact: If the component where the coating is located is subjected to unexpected impacts, vibrations, or other external impacts, the coating may experience local damage, peeling, and other situations. Even if it is still in a normal high-temperature environment, these damages will begin to spread and fail, greatly reducing the overall service life.
4. Performance factors of the coating itself
Bonding force: The strength of the bonding force between the coating and the substrate material directly affects whether it is easy to peel off during use. Coatings with poor adhesion are more likely to detach from the substrate when affected by various factors mentioned above. Even if other performance indicators are acceptable, they will fail prematurely and cannot guarantee a longer service life.
Density: The better the density of the coating, the more effectively it can block the damage of external corrosive media, high-temperature gases, etc. to the substrate. If there are defects such as pores and cracks in the coating, it will make these unfavorable factors easier to invade, accelerate the damage process of the coating, and shorten its service life.
5. Characteristics and factors of the matrix material
Matching of thermal expansion coefficient: The difference in thermal expansion coefficient between the coating and the substrate material is large, and the thermal stress generated during temperature changes is high, which can easily lead to coating cracking and peeling, affecting its normal service life. For example, when coating ceramic coatings on certain metal substrates, if the thermal expansion coefficients of the two do not match, the coating may experience problems after several temperature changes.
Surface roughness and cleanliness of the substrate: If the surface roughness of the substrate is too large, it is not conducive to uniform adhesion of the coating and is prone to local weak points; When the surface is not clean enough and there are oil stains, impurities, etc. present, it can also affect the bonding between the coating and the substrate, making the coating more prone to failure during use and reducing its service life.
6. Construction process factors
Coating method and quality: Different coating methods (such as spray coating, brush coating, dip coating, etc.) and the degree of operational standardization during the coating process can affect the uniformity and density of the coating thickness. If the coating quality is poor, the coating itself has inherent deficiencies, which make it more prone to damage in subsequent use and unable to achieve the expected service life.
Coating curing conditions: After coating, the coating needs to be cured according to the specified curing conditions (such as temperature, time, etc.). If the curing is not complete, the performance of the coating cannot be fully utilized, and its strength, adhesion, etc. will be affected, thereby affecting its service life in high temperature environments.

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