The service life of high-temperature coatings is affected by various factors, and the following is an analysis of different situations:
Depending on the type of coating
Organic silicon high-temperature paint: Within its specified temperature resistance range, such as organic silicon high-temperature paint that can withstand around 800 ℃, it can generally maintain a service life of 2-5 years under normal operating conditions. However, if exposed to harsh conditions such as frequent temperature fluctuations and strong chemical corrosion environments for a long time, it may take 1-2 years to repaint.
Ceramic high-temperature coatings: Ordinary ceramic coatings have a service life of approximately 3-8 years when applied in conventional industrial high-temperature environments (around 1000 ℃ -1500 ℃). High performance thermal barrier ceramic coatings applied in the aerospace field can even be used for more than 10 years under careful maintenance and normal working conditions.
Inorganic high-temperature coatings: For example, some inorganic high-temperature coatings that can withstand high temperatures of 1500 ℃ -1800 ℃ can have a service life of about 5-10 years in relatively stable high-temperature and corrosive environments. However, if they are subjected to frequent thermal shock, mechanical external impact, and other situations, their service life will be correspondingly shortened.
Affected by the usage environment
Temperature factor:
If high-temperature coatings work in environments close to their tolerance limit temperature for a long time, the aging, decomposition, peeling and other rates of the coating will accelerate, and the service life will be significantly shortened. For example, a coating that can withstand 1200 ℃ and operate continuously at 1100 ℃ -1200 ℃ may experience performance degradation and need to be replaced after about 3 years, even though it could have been used for 5 years.
If the actual working temperature is much lower than its upper temperature limit, the stability of the coating will be better and the service life will be extended. Coatings that can withstand 800 ℃ may last for 6-8 years when used in an environment around 500 ℃.
Chemical corrosion environment:
In a high-temperature environment with strong chemical corrosion such as acid, alkali, salt spray, and oxidizing gases, the coating will be continuously eroded. For example, in chemical production with high temperature and strong acidic gases, the service life of high-temperature coatings may be shortened by half or even more than in ordinary dry high-temperature environments.
On the contrary, in relatively pure and chemically stable high-temperature environments (such as some electrically heated dry environments), coatings can maintain good performance and correspondingly increase their lifespan.
Mechanical stress situation:
If high-temperature equipment experiences frequent mechanical stresses such as vibration, friction, and erosion, such as components with high-temperature coatings inside high-speed engines, the coatings are prone to failure due to wear and peeling, resulting in a shorter service life of only 1-3 years.
In relatively static and stable high-temperature environments, coatings are less affected by mechanical forces and have a longer lifespan. For example, coatings on the inner walls of high-temperature furnaces can be used for a longer period of time if there are no external damage factors.
Construction quality impact
Poor surface treatment: If the surface of the substrate is not thoroughly cleaned, with oil stains, rust residue, or roughness that does not meet the requirements, the adhesion between the coating and the substrate will be poor, and it is easy to peel and peel off in high temperature environments, leading to premature failure of the coating. What could have been used for 5 years may not work for 2-3 years.

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