An overview of the ceramic spray process

An overview of the ceramic spray process

The use of ceramic thermal spraying technology can not only improve the wear resistance, corrosion resistance, erosion resistance, thermal stability and chemical stability of machinery and equipment, but also endow common materials with special functions, such as high temperature superconducting coatings, biological coatings Therefore, thermal spraying technology will inevitably attract more and more attention and be more and more widely used in various industrial fields.

However, the actual parts vary greatly due to their material, shape, size, application environment, service conditions, etc. In order to successfully use thermal spray coating to solve the technical problems faced, a specific process must be followed. Among them, the most Important are the following five key processes.

• 1. Accurately analyze the problem and clarify the coating performance requirements;
• 2. Reasonable coating design, including the correct selection of spraying materials, equipment, processes and strict coating quality performance evaluation system;
• 3. Optimize the coating preparation process;
• 4. Strictly control the coating quality;
• 5. Economic feasibility analysis of coating technology.

Coating design plays a linking role, which is the basis for using thermal spraying technology to successfully solve practical problems, and is one of the most important links in all links. Obvious system characteristics.

Therefore, in order to obtain a coating that meets the performance requirements, a careful and reasonable coating design must be carried out before spraying. The main elements of thermal spray coating design include:

• First,According to the working conditions of the surface of the parts or the analysis results of the parts that have surface failure, determine the technical requirements of the surface coating or surface coating system of the parts, including bonding strength, hardness, thickness, number and size of pores, Wear resistance, corrosion resistance, heat resistance or other properties;
• second,Use the basic knowledge of thermal spraying technology (including spraying materials, spraying process, coating performance, etc.) to carry out economic and technical feasibility analysis to meet performance requirements, consider coating economy, and then select appropriate spraying materials, equipment and process methods;
• third,Formulate reasonable coating preparation process specifications; finally, put forward strict coating quality inspection and control standards, parts packaging and transportation conditions, etc. More stringent requirements now even include total quality management requirements for manufacturers of coating raw materials.

All of the above content constitutes a complete process of thermal spray coating design. It should be specially pointed out that although the performance of thermal spray coating mainly depends on the performance of the sprayed material, it is also significantly affected by the selected spraying equipment and spraying process.

For the same spraying material, when different spraying equipment and different spraying process parameters are used for spraying, the performance of the obtained coating will be very different. In addition, every other link involved in the preparation of the coating will determine the final coating properties, such as surface pretreatment, cooling measures, coating machining, etc. Therefore, it is only possible to obtain comprehensive quality control of each process of coating preparation. Coatings with satisfactory performance and stable quality.