Model of coating wear degradation in precision glass molding
Model of coating wear degradation in precision glass molding
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DOI：
10.1007/s00170-015-8005-2
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
F. Klocke;O. Dambon;M. Rohwerder;F. Bernhardt;M. Friedrichs;S. V. Merzlikin
中科院分区：
文献类型：
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作者：
F. Klocke;O. Dambon;M. Rohwerder;F. Bernhardt;M. Friedrichs;S. V. Merzlikin
精密玻璃成型（PGM）中的涂层在数百或数千次压制循环期间经历严重的热化学和热机械负荷。到目前为止，对这些应用中保护涂层的完整性损失知之甚少。获得保护涂层功能退化的基本机制的知识是非常感兴趣的。本文研究了贵金属PVD涂层在热玻璃接触退火后表面附近区域的成分变化。通过光学显微镜、SEM/EDX和X射线光电子能谱（XPS）分析了试样上的不同特征磨损区。将结果与在工业生产中使用的模具上观察到的磨损阶段进行比较。提出了一个定性模型的基板涂层系统的退化，从初始阶段的材料改变到最终的涂层故障。此外，还发现了玻璃成分可能在整个降解过程中发挥作用的迹象，但无法详细揭示。关于PGM的高精度成型工具，进一步的工作应集中在磨损的初始阶段，因为使用寿命的结束时间是在早期降解阶段达到的，远远早于涂层剥落。
Coatings in precision glass molding (PGM) experience severe thermo-chemical and thermo-mechanical loads during several hundred or thousand pressing cycles. Until now, little is known about the integrity loss of protective coatings for these applications. Gaining knowledge of fundamental mechanisms on the functional degradation of protective coatings is of great interest. The work presented in this paper investigates compositional changes in the surface-near region of precious metal PVD-coatings after being annealed in hot glass contact. Different characteristic wear zones identified on the samples have been analyzed by light microscopy, SEM/EDX, as well as X-ray photoelectron spectroscopy (XPS). The results are compared to the wear stages observed on molds used in industrial production. A qualitative model for the degradation of the substrate-coating system is proposed, ranging from the initial phases of material alteration to the final coating breakdown. In addition, indications that glass components might play a role in the overall degradation process were found but could not be revealed in detail. With regards to highly precise molding tools for PGM, further work should be focused on the initial phase of wear, since the end of service life time is reached at early degradation stages, far before the coating flake-off.