three layer polyethylene coating 三层聚乙烯涂层
Coating by physical vapour deposition (PVD), coating by chemical vapour deposition (CVD) and surface layer modification by ion implantation, all three are being tested and are partly in use.
涂层的化学气相沉积(CVD)和表面层改性的物理气相沉积(PVD)涂层的离子注入，所有三个正在受到考验，并部分使用。
The thermal protection mechanism of three layer for coating material under heating process was discussed, the conservation equations which reflects difference function was established.
本文讨论了涂层材料在加热过程中出现的三层结构的吸热机理，建立不同层反映不同功能的守恒方程。
A technology of three - layer corrosion prevention coating has been developed and used in the corrosion prevention project of steel pipe piles in Dandong dock.
根据海洋钢管桩防腐需要研究开发的管道三层结构防腐涂层技术，已在丹东港码头钢管桩防腐工程中应用。
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