What effect does the adhesion strength of the anti-oxidation coating on the surface of the silicon carbon rod have on its performance?

The adhesion strength of the anti-oxidation coating on the surface of the silicon carbon rod has many important effects on its performance, as follows:
Anti-oxidation performance
Effective protection: The coating with high adhesion strength can fit tightly on the surface of the silicon carbon rod to form a continuous and complete protective film, effectively blocking oxygen from contacting the silicon carbon rod substrate, thereby significantly improving the antioxidant ability and extending the service life of the silicon carbon rod. For example, in a high temperature environment, if the coating is firmly attached, it can prevent oxygen from diffusing into the silicon carbon rod and slow down its oxidation rate.
Protection failure: When the coating adhesion strength is insufficient, the coating is prone to peeling and flaking under the action of thermal cycles, mechanical vibrations, etc. Once the coating is damaged, the silicon carbon rod substrate is exposed to the air, which will accelerate oxidation, resulting in a decrease in the performance of the silicon carbon rod, or even premature scrapping.
Thermal conductivity
Stable thermal conductivity: When the coating adhesion strength is good, the thermal resistance between the coating and the silicon carbon rod substrate is small, which can ensure that heat is effectively transferred between the two, and has little effect on the thermal conductivity of the silicon carbon rod. In this way, the silicon carbon rod can maintain a stable heating efficiency and meet the use requirements.
Heat conduction is blocked: If the coating is not firmly attached, gaps or voids will form between the coating and the substrate. These air gaps will increase thermal resistance, hinder heat transfer, reduce the thermal conductivity of the silicon carbon rod, and cause uneven heating, which will affect the use effect.
Mechanical properties
Enhanced protection: Coatings with high adhesion strength can enhance the surface hardness and wear resistance of silicon carbon rods to a certain extent. For example, in an environment with particle scouring or friction, the coating can protect the surface of the silicon carbon rod, reduce wear, and maintain its mechanical integrity.
Cause damage: Coatings with poor adhesion strength are easy to fall off from the surface of the silicon carbon rod when subjected to external forces. Not only will they lose their protective effect, but they may also cause scratches, cracks and other damage to the surface of the silicon carbon rod during the falling process, reducing the mechanical strength of the silicon carbon rod and making it easier to break during use.
Thermal stability
Stable operation: Coatings with strong adhesion can maintain a good state after the silicon carbon rod has undergone multiple heating and cooling cycles, and will not fall off or fail due to thermal stress. This helps the silicon carbon rod to work stably under different temperature conditions and maintain the consistency of its performance.
Thermal stress concentration: If the coating adhesion strength is not enough, when the temperature changes, the thermal expansion difference between the coating and the silicon carbon rod substrate will cause the coating to partially fall off or crack, which will cause thermal stress concentration. This will not only accelerate the destruction of the coating, but also affect the structural stability of the silicon carbon rod, and in severe cases, cause the silicon carbon rod to rupture.