Core insert for glass molding machine and method for making same

摘要

A core insert for a glass molding machine includes a substrate and a protective film. The substrate is made of ceramic, such as tungsten carbide (WC), carborundum (SiC), silicon nitride (Si₃N₄), or boron nitride carbide (BNC). The protective film is deposited on a surface of the substrate, and the protective film is made of a fullerene (C₆₀ or C₇₀). The core insert has good adhesion between the substrate and the protective film, because the fullerene has good adhesion with the ceramic material. Thus the core insert has a long working lifetime. A method for making the core insert is also provided.