Material Analysis
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PA12 SLS Recycled Powder Aging Mechanism
Problem Phenomenon
【Problem phenomenon】The recycled powder ratio remained unchanged, but the porosity of printed parts increased batch by batch and strength declined
Cause Analysis
Recycled powder undergoes molecular weight increase and secondary crystallization at the high temperature of the powder bed, and sintering quality deteriorates; research confirms that parts printed with recycled powder have lower mechanical strength, higher porosity, and stronger hygroscopicity
Solution
Monitor the trends of melt index and DSC thermal performance changes of recycled powder; downgrade or scrap powder whose deterioration exceeds limits; manage new powder and old powder in separate zones to avoid crossing; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Powder aging is molecular weight and crystallinity drift, and thermal performance monitoring determines retention or disposal; 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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