Material Analysis
13 مشاهدة
PA12 SLS Nitrogen Protection and Yellowing
ظاهرة المشكلة
【Problem phenomenon】SLS printed PA12 parts turned yellow on the surface, with mechanical properties declining synchronously
تحليل الأسباب
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
الحل
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
الخلاصة الأساسية
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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