Amorphous Carbon Coated Silicon Wafer as Mold Insert for Precision Glass Molding

Lin Zhang, Jiwang Yan

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


Press molding of glass is an emerging research area for micro-optics manufacturing. Despite advancements on coating layers of precision molds for glass molding, challenges still exist towards tailoring non-stick coating to provide consistent replication accuracy in thousands of repetitive molding cycles. In this study, atmospheric pressure chemical vapor deposition (APCVD) is introduced to synthesize nanoscale-thickness amorphous carbon layer on the surface of silicon wafer with liquid benzene as the carbon source and silicone rubber as the silicon oxycarbide (SiOC) source. The micro-morphologies of the coating layers under different conditions are obtained and analyzed. In the press molding, the coating exhibits extraordinary physical properties and can remarkably prevent silicon-glass adhesion under elevated temperature. Typical micro-structures, such as micro-pillar and micro-lens arrays on the amorphous carbon coated silicon wafers, are used as mold inserts in precision glass molding to replicate high-precision optical components. The results indicate that this amorphous carbon coated silicon wafer can replicate intricate micro-structures to glass substrates with high-precision dimensions without macroscopic adhesion. This coating technology will protect the mold materials with low adhesion and improve precision glass molding process.

Original languageEnglish
Pages (from-to)525-530
Number of pages6
JournalProcedia CIRP
Issue numberC
Publication statusPublished - 2022
Event6th CIRP Conference on Surface Integrity, CSI 2022 - Lyon, France
Duration: 2022 Jun 82022 Jun 10


  • amorphous carbon coating
  • micro-lens array
  • micro-structure
  • precision glass molding
  • silicon wafer

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering


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