Advantage
1. Good bonding performance
Metal based high-temperature resistant coatings usually have a natural affinity with metal matrix materials, which can achieve good metallurgical or mechanical bonding. For example, nickel based coatings prepared by thermal spraying technology are applied to metal substrates such as steel. By melting metal particles that collide with the surface of the substrate and rapidly cool and solidify, they can tightly adhere to the substrate without easily peeling off due to insufficient bonding force, ensuring that the coating can continue to function in high temperature environments.
2. Possess certain high temperature resistance and wear resistance ability
Coatings made of high-temperature alloys such as cobalt based and nickel based can withstand high temperatures and maintain a certain strength and hardness under high temperature conditions, with good wear resistance. For example, applying such coatings on the surface of gas turbine blades can not only withstand the erosion of high-temperature gas, but also reduce the friction and wear between the blades and the surrounding medium during high-speed rotation, effectively extending the service life of the blades and ensuring stable operation of the equipment in high-temperature environments.
3. Relatively strong repairability
If the metal based coating is locally damaged during use, such as small areas falling off due to accidental impact, it can be easily repaired through conventional methods such as welding and touch up coating. Compared to some coating types that are difficult to repair, such as ceramic coatings, the repair operation of metal based coatings is relatively convenient, and the repair cost is also relatively easy to control. It can timely restore the protective function of the coating and reduce the impact on the overall equipment operation.
4. Thermal conductivity is beneficial for heat dissipation
Metal materials generally have good thermal conductivity and have advantages in some high-temperature application scenarios that require timely heat dissipation. For example, coating a metal based coating on the surface of some high-temperature components of a car engine can quickly dissipate heat through the coating, avoiding excessive heat accumulation and causing component temperature to be too high. This helps maintain the normal operating temperature of the components and ensures the overall stability of the engine performance.
5. Performance can be optimized by adjusting the composition
The composition of metal based coatings can be flexibly adjusted according to specific high-temperature environmental requirements, such as adding different alloying elements to change their high-temperature resistance, oxidation resistance, wear resistance, and other properties. For example, adding an appropriate amount of chromium element to nickel based alloys can enhance their antioxidant capacity, and adding molybdenum element can improve their strength at high temperatures, in order to meet the diverse requirements of high-temperature application scenarios.
shortcoming
1. Relatively limited antioxidant capacity
Although metal based coatings themselves can withstand a certain degree of high temperature, when exposed to high temperature and strong oxidizing environments for a long time, metal atoms are prone to oxidation reactions with oxygen, forming an oxide layer. Over time, the oxide layer continues to thicken and peel off, leading to a decrease in coating performance or even failure. Therefore, in extremely high temperature and oxygen rich environments, relying solely on metal based coatings often fails to provide long-term stable protection, and additional measures such as antioxidants and surface coating modification are usually needed to enhance their antioxidant performance.
2. Poor thermal insulation performance
Due to the high thermal conductivity of metal materials, metal based high-temperature resistant coatings perform poorly in blocking heat transfer compared to coatings with good insulation properties such as ceramics. In some application scenarios that require effective insulation of high temperatures to prevent heat transfer to the surrounding environment or other components, such as thermal protection systems for spacecraft and insulation linings for high-temperature industrial kilns, metal based coatings are difficult to meet insulation requirements and often need to be used in conjunction with other insulation materials to achieve the desired insulation effect.
3. Easy to undergo phase transition and structural changes at high temperatures
In high-temperature environments, the internal structure of metal based coatings may undergo changes with increasing temperature and time, such as grain growth and phase transition. These changes will affect the mechanical properties of the coating, causing changes in its strength, hardness, and other properties, thereby reducing the protective effect of the coating, and may even lead to failure phenomena such as cracking and peeling, limiting its application in some high-temperature and long-term use scenarios that require high structural stability.
4. High material costs
The high-temperature alloy materials used in metal based high-temperature resistant coatings, such as nickel based alloys, cobalt based alloys, etc., have relatively high raw material costs, and their preparation processes are often complex. For example, the thermal spraying process requires professional equipment and precise process parameter control. These factors make the overall cost of metal based high-temperature resistant coatings high, which to some extent limits their widespread application in some cost sensitive large-scale application scenarios.

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