Material Analysis
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PA12 SLS Nitrogen Protection and Yellowing
Problem Phenomenon
【Problem phenomenon】SLS printed PA12 parts turned yellow on the surface, with mechanical properties declining synchronously
Cause Analysis
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
Solution
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
Key Takeaway
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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