Abstract
In the glass molding process, the sticking reaction and fatigue wear between the glass and mold hinder the service life and functional application of the mold at the elevated temperature. To improve the chemical inertness and anti-friction properties of the mold, an amorphous carbon coating was synthesized on the tungsten carbide-cobalt (WC–8Co) substrate by magnetron sputtering. The friction behavior between the glass and carbon coating has a significant influence on the functional protection and service life of the mold. Therefore, the glass ring compression tests were conducted to measure the friction coefficient and friction force of the contact interface between the glass and amorphous carbon coating at the high temperature. Meanwhile, the detailed characterization of the amorphous carbon coating was performed to study the microstructure evolution and surface topography of the amorphous carbon coating during glass molding process by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Ramon spectroscopy, and atomic force microscope (AFM). The results showed that the amorphous carbon coating exhibited excellent thermal stability, but weak shear friction strength. The friction coefficient between the glass and coating depended on the temperature. Besides, the service life of the coating was governed by the friction force of the contact interface, processing conditions, and composition diffusion. This work provides a better understanding of the application of carbon coatings in the glass molding.
Highlights
With the development of modern science and technology, the glass-based optics, including aspheric lens, gratings, Fresnel lenses, micro-lens arrays, and metalens, have increasing demands in many fields, such as medical diagnosis, biochemical analysis, optical communication, optical imaging, and optical sensor [1,2,3]
The performance of the amorphous carbon films with a high percentage of sp2 bonds has been optimized recently, there is still unclear mechanism of thermal-displacement coupled interface friction when the film was used in the glass molding
The mold and the glass were heating to the specified temperature (620–680 °C) and soaked for 150 s to uniform the temperature
Summary
With the development of modern science and technology, the glass-based optics, including aspheric lens, gratings, Fresnel lenses, micro-lens arrays, and metalens, have increasing demands in many fields, such as medical diagnosis, biochemical analysis, optical communication, optical imaging, and optical sensor [1,2,3]. Temperature, the unique materials, including silicon carbide, WC, and silicon nitrogen, are commonly chosen as mold materials due to the excellent thermal stability, less thermal expansion coefficient, high strength, and high hardness. Zhou et al [9] developed the electroless plated nickel-phosphorus (Ni–P) as a mold material for glass molding He et al [10] synthesized the carbide-bonded graphene networks on the Si substrate by chemical vapor deposition and confirmed that the film exhibits an excellent chemical inertness and mechanical properties in glass molding process. The performance of the amorphous carbon films with a high percentage of sp bonds has been optimized recently, there is still unclear mechanism of thermal-displacement coupled interface friction when the film was used in the glass molding. The friction mechanism between the coating and glass was revealed
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