The Science & Technology
of Glass
Cambridge - Monday 4th to
Wednesday 6th September 2017

Ray-Jay Jeng

article posted 22 May 2017

I received my Master of Science degree from the Department of Material Science and Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan. Currently, I am a Ph. D. graduate student oriented by Professor Tetsuji Yano in the Department of Chemistry and Material Science, Tokyo Institute of Technology, Tokyo, Japan.

Determination of the critical forming condition for ultra-thin tellurite glass film using glass blowing technique
Ray-Jay Jeng1 *, Tetsuo Kishi2, & Tetsuji Yano2

Glass is one of the typical materials with large ability to form various kinds of shape at the working temperature. Thin film glass has been utilized in many industrial fields. For the optical use, the layered structure using glasses with different optical properties induces unique functionalities like interference, photon confinement and propagation, etc. Ultra-thin film formation around 1 μm or below is one of the challenging processes because structure and properties of molten glasses affect much on the thinning behaviour of film. Authors have given their focus on multicomponent tellurite glass film for the constituents of layered structure and direct bonding (DB) method for its processing, because tellurite glass system has unique optical properties; high linear and non-linear refractive index, ultra-low optical loss, high chemical durability, etc., and because DB enables us to bind the films on the substrate at room temperature without post heat treatment, respectively.

In this study, the critical forming condition for the formation of ultra-thin tellurite glass film is determined using glass blowing technique. B2O3-Nb2O5-TeO2 high-refractive-index glass system is chosen for the film material. The homogeneous glass is prepared by conventional melt-quenching method and subjected to the ultra-thin film process. The glass is remelted in the crucible with a hole at the bottom in the temperature range over its softening point. Glass bubble is developed by the introduction of nitrogen gas from the bottom hole and cooled to room temperature. The temperature and gas pressure during blowing are monitored during the fabrication of glass film. The resulted film thickness is analyzed by the factors of the composition and properties of glass and the blowing conditions.


1) Department of Chemistry and Materials Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, Japan
2) Department of Materials Science and Technology, School of Materials and Chemical Technology, Tokyo Institute of Technology, Japan