To ensure that the thickness of the high-temperature resistant coating does not change during use, it is necessary to start from multiple aspects such as coating material selection, construction process control, optimization of the usage environment, and daily maintenance and testing. The following are specific measures:
Selection of Coating Materials
Choose materials with good thermal stability: The base material of high-temperature resistant coatings should have excellent thermal stability, so that thickness changes are not easily caused by decomposition, volatilization, and other reasons in high-temperature environments. For example, ceramic materials (such as alumina, zirconia, etc.) are selected as the main components of the coating, which have high melting points and good high temperature resistance. They can maintain their structural stability during high temperature use, thereby maintaining the original thickness of the coating. They can be applied for protection in high temperature scenarios such as high-temperature furnace lining.
Consider materials that match the thermal expansion coefficient of the substrate: The thermal expansion coefficients of the coating and substrate materials should be as close as possible to avoid significant thermal stress caused by temperature changes, which can lead to cracking, peeling, and other issues in the coating, thereby affecting its thickness. For example, selecting an alloy coating with a thermal expansion coefficient similar to that of the steel substrate, or using a transition layer to adjust the difference in thermal expansion coefficient between the two, to ensure that the coating does not change thickness due to thermal expansion and contraction problems during temperature fluctuations. For example, in some high-temperature engine components, a special intermediate transition coating is applied to solve this problem.
Construction process control
Ensure coating uniformity: Use appropriate coating methods (such as spray coating, brush coating, dip coating, etc.) and strictly follow the operating specifications to ensure that the coating is evenly distributed on the surface of the substrate, avoiding local excessive thickness or thinness. Uneven thickness can cause deformation and peeling of the coating due to uneven internal stress during use, affecting the overall thickness stability. For example, when spraying, it is necessary to control the distance, angle, pressure, and gun speed of the spray gun to ensure uniform coating coverage. For example, when coating the surface of a car engine cylinder with a high-temperature resistant coating, precise spraying technology can ensure uniform coating thickness and maintain stability in subsequent use.
Control the accuracy of coating thickness: Accurately control the initial coating thickness of the coating, determine a reasonable thickness range based on factors such as coating performance, substrate characteristics, and usage conditions, and monitor it in real time through precise measuring tools (such as coating thickness gauges) to ensure that the coating reaches the specified thickness. Avoid thickness changes during use due to unreasonable initial thickness, such as excessive internal stress caused by coating too thick, or insufficient protection due to coating too thin. For example, in the process of coating high-temperature resistant coatings on aerospace components, the coating thickness will be strictly controlled according to design requirements, with errors kept within a very small range.
Ensure the curing quality of the coating: fully cure the coating according to the required curing conditions of the coating material (including curing temperature, curing time, etc.), so that the coating forms a stable structure. Incomplete curing of coatings results in insufficient cross-linking reactions, poor strength and stability, and is prone to deformation, detachment, and thickness changes in high-temperature environments. For example, for epoxy based high-temperature resistant coatings, they need to be cured for a certain period of time within a specific temperature range to ensure their performance and thickness stability.
Optimizing the usage environment
Control the amplitude of temperature changes: Try to minimize severe temperature fluctuations in the usage environment, as frequent and significant temperature changes can cause thermal stress on the coating, which can easily lead to coating cracking, peeling, and other problems, thereby affecting the thickness. For example, in some industrial equipment with intermittent heating, the heating and cooling programs can be optimized by using slow heating and cooling methods to reduce the thermal stress on the coating and maintain its thickness stability. For example, in intermittent heat treatment furnaces, controlling the temperature change rate reasonably can protect the high-temperature resistant coating inside the furnace.
Reduce chemical corrosion factors: Avoid contact between the coating and corrosive chemicals (such as acid, alkali, salt spray, strong oxidizing gases, etc.), which can react chemically with the coating, corrode it, and cause damage and thinning of the coating. For example, in the chemical production environment, for equipment with high-temperature resistant coatings, measures such as installing gas purification devices and sealing protection can be taken to reduce the contact between harmful gases such as acidic and alkaline substances and the coating, ensuring the integrity and thickness stability of the coating.
Reduce mechanical stress: prevent the coating from being subjected to excessive mechanical stress such as friction, wear, and impact, which can directly wear down the coating, causing its thickness to decrease or causing local damage. For example, on the surface of high-temperature rotating components, the smoothness of their operation can be improved by optimizing the design of the components, or measures such as lubrication and buffering can be taken to reduce friction and impact forces, protecting the coating thickness from mechanical effects. For example, on the blades of high-temperature turbine engines, improving their aerodynamic design can reduce vibration and protect the high-temperature resistant coating on the surface.
Daily maintenance and testing
Regular appearance inspection: Regularly inspect the appearance of components coated with high-temperature resistant coatings to check for any abnormal conditions such as cracks, peeling, discoloration, etc. on the coating surface, and promptly identify potential thickness changes. For example, in the daily inspection of industrial furnaces, the staff will observe the condition of the high-temperature resistant coating on the surface of the furnace lining. Once peeling is found, it means that there may be thickness changes and further in-depth inspection is needed.
Thickness detection tracking: Use professional tools such as coating thickness gauges to regularly detect coating thickness, establish a thickness change tracking file, compare thickness data from different periods, and accurately grasp the trend of coating thickness changes. If abnormal changes in thickness are found, the cause should be analyzed in a timely manner and corresponding remedial measures should be taken, such as re coating or repairing the coating, to ensure that the coating thickness is always maintained within a reasonable range. For example, on high-temperature components of power equipment, the coating thickness will be regularly checked to ensure long-term stable operation.
Through the implementation of the above comprehensive measures, the thickness of the high-temperature resistant coating can be maximally ensured to remain unchanged during use, enabling it to continuously and stably exert its protective effects such as high temperature resistance.

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High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.