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A Summary Of Theoretical Knowledge Of Tempered Glass Structures
Jun 27, 2017

A Summary of Theoretical Knowledge of Tempered Glass Structures
The early view of the tempered glass structure is based on the concept of supercooled liquid. The molten tempered glass is considered to be a solution in which the oxide is dissolved in other oxides, more precisely the intermixes of the constituent oxides, the molten liquid is cooled down without crystallization, and a rigid body is formed at room temperature.

In recent years, the development of tempered glass atomic structure theory has been widely accepted. The Unconventional Network Theory assumes that the structural elements are stacked together in a disordered network, and our understanding of the composition and properties of tempered glass is described by the pioneers of the tempered glass studies described by the oxide tempered glass structure and the tempered glass formation conditions knew. Began to systematically explore the phenomenon of tempered glass, pointed out that the cooling rate of the understanding of the glassy state is the most important. Tempered glass is a hard solid rather than a liquid. 1926 Goldsmith. ] Put forward his point of view according to the modern crystallization chemistry theory.

Tempered glass is similar to the composition of the same composition of the crystal, but the typical nature of tempered glass is the lack of remote ordered structure. The ability of the molten material to solidify without crystallization can be explained by polyhedral geometries, especially with the positive and negative ion radius ratios. Therefore, Goldsmith puts the crystalline chemical concept into the field of glass technology. In 1932, Harris proposed a decisive discussion of the development of tempered glass structures. He proposed the atomic structure model of quartz tempered glass. From the model, silicon atoms were surrounded by four oxygen atoms, and quartz crystal and sodium silicon tempered glass were The only difference between tempered glass and crystal is that the tempered glass has no periodic, continuous, randomly distributed three-dimensional structure that has the same short-range order as the quartz crystal, but is distorted.

The addition of alkali metal oxides to quartz tempered glass will cause the quartz tempered glass structure to relax because it reduces the total number of tetrahedra, which can be explained by the low viscosity of pure quartz tempered glass, The composition of the tempered glass into the network forming body oxide and network modified body oxide is simple and useful, and later introduced the "intermediate" concept. There is a widely used formation of tempered glass Zahari Asen law, Wallen and his colleagues with x-ray technology to determine the atomic structure of the glass model, the results consistent with the Zahari Asen model. The application of x-ray makes the greatest contribution to the present concept of tempered glass structure.

The network forming body is a class of elements with an oxygen element bound to its bond energy of 340 ^ 350kJ / mol. Network modifiers such as Mg, Ca. Li, K, Na, Cd and Cs'. They have a high diffusion coefficient of 40-250 kJ / mol, especially Me + ions, which break the continuous Si-O-Si network and reduce the melt viscosity at any temperature. M2 + Ions as a bridge between two oxygen atoms, but also to break the network structure, but they are not easy to move, the impact of melt flow than Me + ions.