Material Analysis
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PA12 SLS Nitrogen Protection and Yellowing
Fenómeno del problema
【Problem phenomenon】SLS printed PA12 parts turned yellow on the surface, with mechanical properties declining synchronously
Análisis de la causa
In the high-temperature powder bed, PA12 contacts oxygen and oxidizes, yellowing and degrading; nitrogen purity must be ≥99.9% to isolate oxygen; excessively high laser power also aggravates local thermal oxidation
Solución
Increase nitrogen purity to above 99.9% and monitor oxygen content; reduce laser power by 5-10% for verification; trace gas purity records for yellowed batches; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
For SLS yellowing, first check nitrogen purity; 99.9% is the bottom line for oxidation prevention; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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