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



Ray-Jay Jeng
<jeng.r.aa@m.titech.ac.jp>

article posted 03 August 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.


Improvement of direct bonding strength of tellurite glass film with optical substrates in vacuum
Ray-Jay Jeng1 *, Tetsuo Kishi2, and Tetsuji Yano2

Abstract Combining two materials together can be achieved by various manners like mechanical connection, chemical connection, intermolecular force, electrostatic force etc.. Direct bonding (DB) is categorised as a technique using intermolecular force. Very close direct contact of surfaces of subjects induces adhesive interactions between elements on each surface to form ‘bonds’. The hydroxyl groups on surface are often used to induce an adhesive force to form hydrogen bonding. The advantage of DB method is to minimize the adhesives between subjects, and post heat-treatment is effective to improve bonding force if the same materials are bonded, because of no difference of thermal expansion.

Authors have investigated the formation of tellurite glass film on silicate glass substrate by DB method at room temperature to form layered structure for optical device platform, where different optical materials should be properly combined to induce desired optical functionalities, and post-heat-treatment free process is desirable.

In this work, fundamental experiments on DB of tellurite glass film with various kinds of optical substrates are conducted to evaluate bonding strength. B2O3-Nb2O5-TeO2 glass system is chosen for tellurite glass film. The film specimens fabricated by blowing technique are subjected to DB procedure with various optical substrates like glass, single crystal, ceramics etc. in vacuum condition. Bonding strength is evaluated by Obreimoff-Metsik Method. Vibrational spectroscopies are applied to investigate the chemical bonds between layers and their correlation with bonding strength are clarified.

Institutions:

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