PtIr protective coating system for precision glass molding tools: design, evaluation and mechanism of degradation

TL;DR

This study designs and evaluates PtIr protective coatings for precision glass molding tools, identifying optimal thickness and adhesion layers, and investigates degradation mechanisms through extensive characterization techniques.

Contribution

The paper introduces four new PtIr coating systems for PGM tools, evaluates their durability, and elucidates degradation mechanisms using advanced microscopy and spectroscopy.

Findings

600nm PtIr with 20nm Cr shows best durability

Degradation involves interdiffusion, oxidation, and spallation

Coating optimization can enhance tool lifespan

Abstract

During Precision Glass Molding (PGM), the molding tools have to withstand severe thermo-chemical and thermo-mechanical loads cyclically. To protect their high-quality optical 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 600nm thick PtIr layer and a 20nm thick Cr adhesion layer, showed the best durability with the longest lifetime. 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.