ceramic coating 
advantage
Excellent high temperature resistance: Coatings made of ceramic materials such as silicon carbide (SiC) and silicon nitride (SiN) can withstand extremely high temperatures and can typically work stably for long periods of time in environments above 1000 ℃ or even higher. For example, they play a key role in high-temperature protection in high-temperature components of aircraft engines, ceramic kiln linings, and other scenarios.
Good chemical stability: It has strong antioxidant capacity and corrosion resistance, and can maintain its structural stability in environments with high temperatures, strong oxidizing atmospheres, and various corrosive media (such as sulfur, chlorine, and other components in high-temperature gas), effectively protecting the substrate material from corrosion.
Excellent thermal insulation performance: Ceramic materials have relatively low thermal conductivity, which can provide good insulation effect and reduce heat transfer to the substrate. They are widely used in thermal protection of spacecraft and insulation of high-temperature industrial furnaces, helping to reduce energy consumption and protect surrounding components from high temperatures.
shortcoming
Weak adhesion with the substrate: Ceramic materials have significant differences in physical and chemical properties compared to most metal substrates, with obvious mismatch in thermal expansion coefficients. They are prone to internal stress caused by temperature changes, leading to coating peeling, cracking, etc. Complex methods such as preparing transition layers and special pretreatment of the substrate are often needed to enhance the adhesion, but the effect is sometimes not ideal.
High brittleness: Ceramics themselves have a brittle texture and are prone to damage when subjected to external impacts such as mechanical collisions or particle erosion in high-speed airflow, which affects their protective function. Additional measures to enhance toughness are needed to improve their impact resistance.
Relatively high cost: The preparation process of ceramic materials is complex, for example, some high-performance ceramics require special processes such as high-temperature sintering, and the raw material cost is not low, which makes the overall cost of ceramic coatings high, limiting their application in some cost sensitive large-scale application scenarios.
Metal coating
advantage
Good bonding performance: Metal coatings often have good affinity with metal substrate materials, and under appropriate process conditions (such as arc spraying in thermal spraying processes), they can achieve a relatively strong bond without easily peeling off due to insufficient bonding force. For example, in high-temperature protection of some metal structures, metal coatings of the same material can adhere well to the substrate.
Certain high temperature resistance and wear resistance: High temperature alloy coatings such as nickel based and cobalt based coatings can withstand high temperatures and have certain strength and wear resistance in high temperature environments. They can be used for surface protection of components with relative motion and friction at high temperatures, such as gas turbine blades, which can reduce wear and extend the service life of components under high temperature conditions.
Good repairability: If there is local damage to the coating, it is relatively easy to repair it through conventional repair methods such as welding and touch up coating. The operation is more convenient and the cost is relatively controllable, which has certain advantages compared to some other difficult to repair coating types.
shortcoming
Limited antioxidant capacity: Although metal coatings can withstand certain high temperatures, they are prone to oxidation reactions in long-term high-temperature and highly oxidizing environments, leading to a decrease or even failure of coating performance. Therefore, it is often necessary to enhance their antioxidant capacity through the use of antioxidants or surface treatment. When used alone, the protective effect in extreme high-temperature oxidation environments is not satisfactory.
Poor insulation performance: Metal materials usually have high thermal conductivity, and compared to ceramic coatings, their insulation effect is poor, making it difficult to effectively block heat transfer. In some high-temperature application scenarios that require insulation, they may not meet the requirements and may require additional insulation materials to achieve insulation purposes.
Organic coating (coating formed by high-temperature resistant organic coatings)
advantage
Convenient construction: Conventional construction methods such as brushing and spraying can be used, and the operation is relatively simple. The requirements for construction equipment and environment are not as strict as some ceramic coating and metal coating preparation processes. It is easy to apply on various shapes and sizes of substrate surfaces, such as on small high-temperature equipment or complex shaped component surfaces.
Low cost: The raw material cost of high-temperature resistant organic coatings is usually lower than that of ceramic materials and high-temperature alloy materials, and the production process is relatively simple, so the overall cost is relatively cheap. It is suitable for application scenarios that are sensitive to cost and do not require extremely high temperature resistance performance (generally withstanding several hundred degrees of high temperature), such as the outer protection of ordinary industrial furnaces.
Good flexibility: Organic coatings have a certain degree of flexibility. Compared to ceramic coatings, they are less prone to cracking and other issues when subjected to minor external impacts or temperature changes, and can adapt well to slight deformations on the substrate surface.
shortcoming
Low high temperature resistance limit: Compared to some high-performance products in ceramic coatings and metal coatings, organic coatings can withstand relatively limited maximum temperatures, generally within a few hundred degrees Celsius, making it difficult to apply in extreme high temperature environments such as over 1000 ℃, and their application range is limited to a certain extent.
Poor chemical stability: In environments with high temperatures and the presence of strong oxidizing or corrosive substances, the chemical stability of organic coatings is not as good as that of ceramic coatings, which are prone to decomposition, oxidation, corrosion, and other situations, resulting in rapid loss of their protective function. Regular maintenance and re coating are required.
Weak wear resistance: The hardness and wear resistance of organic coatings are usually poor. In application scenarios with friction, erosion, and other conditions at high temperatures, they are easily worn off and cannot effectively protect the substrate material for a long time. Therefore, they often need to be used in conjunction with other wear resistance measures.

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