玻璃退火过程介绍（Introduction of glass annealing process）.docVIP

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玻璃退火过程介绍（Introduction of glass annealing process）.doc

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玻璃退火过程介绍（Introduction of glass annealing process）

玻璃退火过程介绍（Introduction of glass annealing process） Glass annealing is to create a uniform temperature field and structural adjustment required and uniform, the difference between the reduced structure, the rigid body is fixed to the provisions of cold structure and irreversible difference caused by permanent stress is reduced to the product value is in the subsequent cooling, thetemporary stress with temperature control the difference in the structure, both reversible {TodayHot} disappear, prevent the heat treatment process of glass cracking. In the cooling process, the viscosity of glass increases exponentially. However, the physical characteristics of glass show a continuous and gradual change, and it has undergone six physical characteristics, [1]: (1) free flowing melt ETA = 101.88 ~ 105 P, 1500 ~ 918.30 DEG C [2] delta T = 581.70 On the basis of literature: P 105, the glass liquid can freely flow; pull thin start at 105.25 P, 893.86 c. (2) high viscous plastic body ETA = 105 ~ 109 P, 918.30 ~ 662.84 DEG C, delta T = 255.46 Deformed by external forces, but unable to restore the original shape by removing external forces is called plasticity. On the basis of literature: 106 P, 829.93 C is intermediate state plasticity; 106.5 P, 793.72 C is the best thin; 106.75 P, 777.19 C is thin limit. Plastic and dropped with the increase of viscosity, cold to 109 P, {HotTag} and the glass hardened plastic disappear. (3) elastoplastic body (a = b = C = 0, or a = b = C, a = B + C) ETA = 109 ~ 1012 P, 662.84 ~ 568.29 DEG C, delta T = 94.55 In the 50s of last century, the elastoplastic theory of reinforced concrete was a great progress in structural mechanics. The glass in the 109 ~ 1012 P, but lost the plastic deformation of [3], temperature difference will have the structure of thermal stress was not measured out, the stress relaxation phenomenon in narrow sense: structure displacement decrease difference b structure and differential deformation implied by the difference of C,