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图7 不同PTFE含量的PU涂层在2 h雾化冲蚀的不同阶段的表面形貌
Fig.7 Surface morphologies of PU coatings containing 0 (a), 1% (b), 2% (c), 3% (d) and 5% (e) PTFE after atomization erosion for 60 min (a1-e1), 90 min (a2-e2) and 120 min (a3-e3) test time