The appearance of carbon fiber is usually smooth, and few people may see the rough parts. After molding, the surface of carbon fiber may have defects such as white spots, bubbles, pores, pits, etc., which need to undergo a series of treatments before delivery.
What are the causes of surface defects of carbon fiber products?
Carbon fiber products are mainly customized, involving a wide variety of molds, most of which use molding processes. During the processing stage, defects such as white spots, bubbles, pores and pits may appear.
The specific reasons are as follows:
1. Vacuum leakage: vacuum bag damage, sealing tape is not in place, mold sealing is poor, etc.;
2. Incomplete penetration: resin gel time is too short, viscosity is too high, carbon fiber precursor is too coarse, resin content is too little, resin overflow is too much, etc., resulting in insufficient penetration of carbon fiber;
3. Operational errors: During the processing, heating is too fast, pressurization is too fast, pressurization is too early, insulation time is too short, temperature is too high, and operational problems lead to insufficient molding of carbon fiber products.
Do surface defects affect the use of carbon fiber products?
Too many surface defects of carbon fiber products are not necessarily proportional to the quality, but carbon fiber products are usually used in the manufacturing industry, which has high requirements for performance and appearance, and too many defects will affect normal delivery. In addition, many defects, many pores, and many cracks will affect the performance of carbon fiber products. There is a professional term for carbon fiber porosity, which is used to summarize the penetration effect of carbon fiber products. If the porosity is too high, it means that the resin content exceeds the standard or is unevenly distributed. In actual production, standard operations must be performed to avoid this situation.
How to deal with surface defects of carbon fiber products?
Surface defects of carbon fiber products are a common phenomenon. Most of them can be processed and repaired. As long as the production process is normal, the yield of good products will not be too low.
For defective carbon fiber products, polishing, cleaning and spraying can be carried out without affecting the performance to eliminate defects and ensure a neat appearance. The process includes water grinding, primer, middle coating, top coating, grinding and polishing, and repeated spraying and polishing to ensure that the appearance of carbon fiber meets the delivery standards.
Reminder: If the defects pose a great threat to the performance, or the processed carbon fiber products do not meet the delivery standards, they must be scrapped and remade.