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Strengthening Glass is the 2015 Scholes Lecture
3/17/15

This year’s AU Scholes Lecture will be given by Dr. Minoru Tomozawa of Rensselaer Polytechnic  Institute on April 30, 2015.

Glass and Water: A New Glass Strengthening Method is the title of his talk.

According to Dr. Tomozawa,  water can improve the mechanical strength of glass by reducing the surface stress.

Most oxide glasses contain a small quantity of water which can greatly influence their properties.  Atmospheric water vapor can also interact with the glass surface, where the water is often absorbed and diffused into the material.

Stress relaxation occurs when a glass is placed under a sub-critical tensile stress at several hundred degrees below the glass transition temperature.  When the tensile stress is released, the residual compressive surface stress of the glass will be of nearly the same magnitude as the applied stress.

This is a third means of strengthening glass by altering the surface compressive stress.  The other two methods, tempering and ion exchange, operate by increasing the surface compressive stress.

This new glass strength mechanism will by discussed in depth at Alfred University at 11:20 a.m. on April 30 in Holmes Auditorium, Harder Hall.