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图11 不同PTFE含量的PU涂层在6.9 MPa管道压力和30°攻角下射流冲蚀不同时间后的表面形貌

Fig.11 Surface morphologies of PU coatings containing 0 (a), 1% (b), 2% (c), 3% (d) and 5% (e) PTFE after jet erosion at 6.9 MPa and 30° attack angle for 5 min (a1-e1), 20 min (a2-e2) and 30 min (a3-e3) test time