Extrusion & Post
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PA12 SLS Mixed Powder Thermal Performance Drift
Problem Phenomenon
【Problem phenomenon】Under a fixed process, the printing window of different batches of mixed powder drifted, and the yield rate fluctuated
Cause Analysis
After multiple sintering cycles, the melting point of the mixed powder increases, crystallinity increases, and crystallization temperature decreases, and thermal behavior changes batch by batch; changes in particle size distribution also affect fluidity and packing density
Solution
Perform DSC thermal analysis on each batch of mixed powder to confirm the sintering window; fine-tune powder bed temperature and laser parameters according to thermal performance; establish a powder batch thermal archive; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Mixed powder thermal performance drifts batch by batch; confirm the window with DSC before putting into production; 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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