What is annealing temperature?
The annealing temperature is selected based on the glass transition temperature, allowing any stress to be released before completely cooling the glass. The Littleton softening point (T s) of glass is the temperature at which the glass moves under its own weight. As a glass is heated, the glass flows more easily.
What is a glass softening point?
As a glass is heated, the glass flows more easily. The resistance to flow is known as viscosity. At the softening point, the glass has a viscosity of 10 7.6 poise. This point is often used to define the working range of the glass. Once the glass has reached the softening point, it is malleable without melting.
What happens at a softening temperature point?
At the softening temperature point, the volume of the sample is decreased, while maintaining its original shape, remaining a cylinder. With the increase of temperature, the melting process of the cylinder persists, and the glass frits shows spherical points.
How hot can a glass substrate be?
As a result, after applying this coating (~550 μm thick) to a 1.5-mm-thick glass substrate, outdoor experiments show that the substrate temperature can be 3.5°C lower than the ambient temperature (30°C) at noon (solar irradiance of 800 W/m 2) and 4°C lower at night (ambient temperature of 17.5°C), even in high humidity (up to 80%).
What is the Littleton softening point of glass?
The Littleton softening point (T s) of glass is the temperature at which the glass moves under its own weight. As a glass is heated, the glass flows more easily. The resistance to flow is known as viscosity. At the softening point, the glass has a viscosity of 10 7.6 poise. This point is often used to define the working range of the glass.
How does glass forming process work?
Glass goes through different transitions during melting. The glass transition temperature, softening point, and crystallization temperature are all part of the glass forming process. Careful maneuvering through these steps is critical to the formation of a stress-free glass product.
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The glass is placed on ceramic rollers that transport it through the tempering furnace, where it is heated to a temperature between 600°C and 700°C, close to its softening point.
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TA5011
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School of Materials Science and Engineering
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Dec 5, Once the annealing temperature is over 540°C, the properties of solid SLG, such as thermal expansion, stress relaxation will begin to change. It is possible that the glass begins to
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Technical Discussion & Message Board
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