Material Analysis
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Treatment of PA12 SLS Unsintered Powder
Problem Phenomenon
【Problem phenomenon】About 70% of the powder in each furnace was unsintered, and direct reuse had poor fluidity affecting powder spreading quality
Cause Analysis
Unsintered powder undergoes long-term thermal stress and its fluidity is damaged, and repeated reuse makes quality uncontrollable; research shows that chemical additives can be used to break amide bonds and directionally restore fluidity, achieving powder regeneration
Solution
Establish an evaluation of the degree of powder thermal aging; blend powder with poor fluidity with new powder in proportion or treat it with chemical regeneration; include powder spreading quality in the first-layer inspection of each furnace; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
70% unsintered powder is the bulk of the cost, and fluidity evaluation determines the reuse method; 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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