High-temperature friction behavior of amorphous carbon coating in glass molding process
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ISSN 2223-7690 CN 10-1237/TH
RESEARCH ARTICLE
High-temperature friction behavior of amorphous carbon coating in glass molding process Kangsen LI1, Gang XU1, Xiaobin WEN2, Jun ZHOU2, Feng GONG1,* 1
Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
2
Shenzhen Kingmag Precision Techonology Co. LTD., Shenzhen 518172, China
Received: 12 June 2020 / Revised: 15 July 2020 / Accepted: 10 September 2020
© The author(s) 2020. 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. Keywords: glass molding process; high temperature; friction behavior; amorphous carbon coating
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Introduction
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 [1–3]. However, the fabrication of glass-based optics with high precision, high efficiency, and low cost is still a challenge and research focus in optical
manufacturing. Compared to the traditional and non-traditional machining methods, such as singlepoint diamond cutting, micro-milling, grinding and polishing, ultrasonic-assisted machining, wet/dry etching, and laser machining, precision glass molding has been a cost-effective and high-efficiency method to fabricate glass optics with mass production and high precision [4]. Unfortu
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