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Effect of surface tension on the glass forming

Date：2013-11-27 Author：zhaoyang Hits：1414

In the glass forming process , the capacity of the glass surface also plays an important role. Surface tension multi-finger boundary surface in contact with the glass and another when in constant temperature and a flat surface accommodate increased power made . Atoms than the inner glass surface of the glass an amount of high atomic , atom transfer from the interior to the surface requires a certain energy, which generally represents the surface tension. Represents the surface tension of Jiangsu glass surface free energy of the surface of the sphere has a tendency to shrink as much as possible , when the surface tension is large , the ball tends to shrink large. Surface tension of the silicate glass is generally 220-380mN / m, water surface tension larger than 3-4 times larger than the molten salt , and the molten metal close to the value .

The surface tension of the glass as the temperature decreases linearly increases with decreasing temperature and the viscosity increases exponentially curve , both within different ranges of glass -forming effect is not the same size , Jiangsu glass . In most cases, viscosity and surface tension of molten glass forming glassware is favorable factors . Assuming the same surface tension of the water glass , the glass material manually picked , blown , drawn , and the drip feeder and other operations can not be achieved , therefore , the surface tension of the glass plays an important role in forming. Pick artificially produced materials, feeders feed , blow molding , freedom forming, molding , etc. are controlled by means of a glass surface tension effect, so as to achieve a certain shape . Small material such as blowing bubbles in the absence of mold Why make spherical , drawn glass rod Why become a circle, is the truth. In addition, the production of glass products , glass products, population explosion and parched mouth , under the action of surface tension of the glass , mouth edge of the glass products naturally round, increases the strength and beauty of glass products , these are glass surface tension effect.

However, the surface tension of the glass on the press-forming is also a downside , sometimes due to the glass surface tension is too large , pressed glassware patterns, angular resolution is not enough, sometimes forming glassware centrifugal surface tension is too large, resulting in the forming impact glassware defects . The temperature of the glass and the surface tension of the molten glass , and when the temperature rises, the particle motion can increase the glass volume expansion , the interaction of the stress relaxation , i.e., lower the surface tension . Generally, when the temperature is raised 100 ℃, the surface tension decreased by 1 %.

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