Investigation of Interfacial Reaction Between Various Optical glasses and Mold Materials

• Main Authors: Cheng-Bang Huo, 霍正邦
• Other Authors: Choung-Lii Chao
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/25299830787160714410

碩士 === 淡江大學 === 機械與機電工程學系碩士班 === 95 === Glass molding process is considered to have great potential of mass producing various spherical/aspherical glass lenses to a higher achievable accuracy and at a lower cost. However, glass molding has its own problems to deal with such as glass stuck on the mold surfaces and chemical interaction between glass and mold materials. During the molding process mold surfaces have to experience cyclic mechanical and thermal loading. This research aimed to investigate the interaction between various optical glass and mold materials at elevated temperature with/without protective coating and protective gas. 　　The results showed that molding in nitrogen gas could always improve the sticking problem. It is also worth noting that the diffusion between mold and glass proceeds more easily when there are more network modifier in the optical glass. The mold coated with Pt/Ir films can effectively reduce the interaction between the mold and optical glass. In the case of glass containing certain network modifiers, such as BaO, it can degenerate the Pt/Ir films and subsequently suppress the anti-stick effect.