During Precision Glass Molding (PGM), the molding tools have to withstand severe thermo-chemical and thermo-mechanical loads cyclically. To protect their high-quality surface against degradation and increase their service lifetime, protective coatings are applied on the molding tools. In this work, we designed four different PtIr protective coating systems, where the thickness of the PtIr layer and the adhesion layer were varied. Their lifetimes were evaluated and compared using an in-house built testing bench. Among all the studied coating systems, the protective coating, which consists of a 600-nm-thick PtIr layer and a 20-nm-thick Cr adhesion layer, showed the best durability. To understand the degradation mechanism of the coating during actual engineering production, an industrial PGM machine was used and emulation PGM tests were conducted. Detailed sample characterization was performed using an array of complementary techniques including white light interferometry (WLI), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), scanning transmission electron microscopy (STEM) and atom probe tomography (APT). Phenomena such as interdiffusion, oxidation, coating spallation and glass sticking on the coating were observed and are discussed in the context of optimization of the coating's performance and durability.

在精密玻璃成型（PGM）期间，成型工具必须周期性地承受剧烈的热化学和热机械负荷。为了保护其高质量的表面免于降解并延长其使用寿命，在模具上涂了保护涂层。在这项工作中，我们设计了四种不同的PtIr保护涂层系统，其中PtIr层和粘附层的厚度各不相同。使用内部测试台评估并比较了它们的寿命。在所有研究的涂层体系中，由600 nm厚的PtIr层和20 nm厚的Cr附着层组成的保护层具有最佳的耐久性。为了了解实际工程生产过程中涂层的降解机理，使用了工业PGM机器并进行了仿真PGM测试。使用一系列互补技术进行详细的样品表征，这些技术包括白光干涉仪（WLI），扫描电子显微镜（SEM），能量色散X射线光谱仪（EDX），扫描透射电子显微镜（STEM）和原子探针层析成像（APT） ）。观察到了诸如相互扩散，氧化，涂层剥落和玻璃粘附在涂层上的现象，并在优化涂层性能和耐久性的背景下进行了讨论。