TY - JOUR
T1 - Microstructural evaluation of sputtered Ru–Pt multilayer anti-stick coatings for glass molding
AU - Akhtar, Awais
AU - Wang, Jianbiao
AU - He, Ruizheng
AU - Yi Chun Wong, Evans
AU - Hung, Karl
AU - Ruan, Haihui
N1 - Funding Information:
We gratefully acknowledge the financial support provided by the Hong Kong GRF (Grant No. 15213619) and by the industry (Ref No.: P19-0167(ME)).
Publisher Copyright:
© 2022 The Author(s)
PY - 2022/8
Y1 - 2022/8
N2 - This work describes the performance of multilayer Ru–Pt coatings with Ti as the interlayer deposited on graphite substrate for applications in precision glass molding (PGM). Different from the previous evaluations with other kinds of coatings for PGM temperatures below 650 °C, we studied the anti-sticking behavior of the developed coatings by annealing them at 750 °C with aluminosilicate glass coverage in a rough vacuum environment. Glass adhesion was not observed even after 40-hour annealing suggesting the high chemical inertness of the coatings at the high temperature. In addition, the Ru–Pt multilayer coatings exhibited a better anti-sticking property than monolayer (Ru or Pt) coatings. The microstructure, surface morphology, and hardness were further characterized. High-resolution transmission electron microscopy (HRTEM) analysis confirmed the perseverance of layered structure after annealing at 750 °C and the hindrance effect on dislocation motion and diffusion arising from the Ru-Pt interfaces. After long-term annealing, interdiffusion leads to Pt-Ru solid solutions, which further enhance the mechanical performance and stability of the noble metal coatings, beneficial for prolonging the lifespan of PGM molds and the optical quality of molded glass. The high anti-sticking and mechanical performances of the developed coatings were finally confirmed in industrial tests.
AB - This work describes the performance of multilayer Ru–Pt coatings with Ti as the interlayer deposited on graphite substrate for applications in precision glass molding (PGM). Different from the previous evaluations with other kinds of coatings for PGM temperatures below 650 °C, we studied the anti-sticking behavior of the developed coatings by annealing them at 750 °C with aluminosilicate glass coverage in a rough vacuum environment. Glass adhesion was not observed even after 40-hour annealing suggesting the high chemical inertness of the coatings at the high temperature. In addition, the Ru–Pt multilayer coatings exhibited a better anti-sticking property than monolayer (Ru or Pt) coatings. The microstructure, surface morphology, and hardness were further characterized. High-resolution transmission electron microscopy (HRTEM) analysis confirmed the perseverance of layered structure after annealing at 750 °C and the hindrance effect on dislocation motion and diffusion arising from the Ru-Pt interfaces. After long-term annealing, interdiffusion leads to Pt-Ru solid solutions, which further enhance the mechanical performance and stability of the noble metal coatings, beneficial for prolonging the lifespan of PGM molds and the optical quality of molded glass. The high anti-sticking and mechanical performances of the developed coatings were finally confirmed in industrial tests.
KW - Anti-sticking performance
KW - Graphite substrate
KW - High-temperature stability
KW - Multilayer coatings
KW - Precision glass molding (PGM)
UR - https://www.scopus.com/pages/publications/85133245095
U2 - 10.1016/j.matdes.2022.110898
DO - 10.1016/j.matdes.2022.110898
M3 - Journal article
AN - SCOPUS:85133245095
SN - 0264-1275
VL - 220
JO - Materials and Design
JF - Materials and Design
M1 - 110898
ER -