Extrusion & Post
11 조회수
PTFE Excessive Porosity
문제 현상
Micro pores and voids exist inside PTFE products, seals leak, and the breakdown voltage of electrical insulation parts decreases.
원인 분석
Insufficient compression during molding means powder particles are not fully consolidated; air retention and insufficient degassing during powder filling or paste extrusion; insufficient sintering temperature and time means particles are not fully fused; paste extrusion lubricant not completely removed forms cavities.
해결 방법
①Apply uniform and sufficient pressure in molding; ②Fully degas powder or paste before processing; ③Ensure correct sintering temperature and holding time; ④Select compatible lubricants and effectively remove them before sintering.
핵심 요약
PTFE porosity is the common enemy of mechanical strength and sealing performance; degassing and compaction are the two lines of defense for prevention; lubricant management is a unique subject of paste extrusion.
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