Material Analysis
12 조회수
PA12 SLS Nitrogen Protection and Yellowing
문제 현상
【Problem phenomenon】SLS printed PA12 parts turned yellow on the surface, with mechanical properties declining synchronously
원인 분석
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
해결 방법
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
핵심 요약
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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