Glass softening point testing device

Abstract

The invention provides a glass softening point testing device, and belongs to the technical field of testing of optical materials. The problem that data are not accurate when a small sample is tested in an existing softening point testing method is solved. The softening point testing is mainly characterized in that an upper protection cover, a lower protection cover, a sample bracket and a testing pressing rod are made of quartz or zero-expansion glass, wherein the lower protection cover is fixed in a heating furnace; a V-shaped groove is formed in the upper part of the sample bracket and a thermoelectric couple hole is formed in the side face of the sample bracket; the sample bracket is arranged at the center of the bottom in the lower protection cover and a thermoelectric couple is arranged in the thermoelectric couple hole; the testing pressing rod penetrates into the sample bracket from a fixed hole in the upper end of the upper protection cover; a load is arranged at the upper end of the testing pressing rod; the testing pressing rod is located outside the upper protection cover and a transverse pointer is fixedly arranged on the rod; and the glass softening point testing device further comprises a graduated disc matched with the pointer. The glass softening point testing device has the characteristics that the operation is simple and testing data are relatively accurate when being compared with data needed by actual production; and the glass softening point testing device is mainly used for testing a softening point of a relatively large glass sample.

Description

technical field [0001] The invention belongs to the technical field of optical material testing, and in particular relates to a glass softening point testing device. It can accurately test the softening temperature of glass, so as to provide reliable data basis for the drawing process of glass optical fiber. Background technique [0002] With the fierce competition and development of the optoelectronic product market, glass optical fibers are more and more widely used in medical, aviation, military, lighting and decoration industries. The glass softening point has become a very important evaluation parameter for optical fiber glass. Currently, commonly used softening point testing devices include quartz dilatometers as shown in Figure 1 and wire drawing devices such as image 3 shown. The test principle of the quartz dilatometer is to use the differential method, that is, to use the material with good thermal stability—quartz glass (rod and tube) at higher temperatures, wh...

AI Technical Summary

Problems solved by technology

But generally speaking, the diameter of the test sample required by the above two test devices and test methods is not greater than 5mm, and the heating rate is relatively fast at 5±1°C / min, so when the test sample is heated by radiation, it cannot be accurately The value of the change of the length of the sample with the change of temperature is obtained

Usually the diameter of the optical fiber preform is greater than 5mm, so using the above method to test the softening point of the material has no practical reference significance for the formulation of the optical fiber drawing process

Images