On the Development of Quartz Glass

        Quartz glass is a special industrial technology glass composed of a single component of silicon dioxide (SiO2). Because it has a series of special properties that cannot be replaced by other materials, it plays a very important role in modern industry and high-tech fields. Ordinary quartz glass is made from natural crystal or silica through high-temperature melting, while high-purity and high-quality quartz glass is made from sterile or organic silicon containing liquid compounds (such as silicon tetrachloride) through flame hydrolysis synthesis process, which is called synthetic fused silica.


 

        Since the 1980s, the manufacturing technology of quartz glass has developed rapidly. Major quartz glass companies around the world have developed new processes and technologies. German herseus quartz glass company has developed the horizontal hot top quartz glass thick wall glass tube technology, which can directly produce a 4mm thick wall tube (cylinder) with an outer diameter of 150mm and an inner diameter of 80mm in a high-power resistance furnace with a water-cooled graphite plug and an external shaper without cold processing. As the blank for re drawing the special sheath tube for optical fiber or the large tube for semiconductor, it has high production efficiency, and on this basis, an advanced production line for optical fiber sheath tube has been built. The non-contact pipe drawing technology is adopted, and the finished pipe is automatically cleaned, dried, inspected and packaged. Therefore, when the pipe is pulled out, it will no longer touch hands, effectively avoiding pollution. At that time, the company almost monopolized the optical fiber tube market all over the world. In recent years, the company has vigorously developed new synthetic quartz glass technology and developed large-diameter optical fiber preforms, which can pull 3000~5000km of optical fibers at a time. Developed by Saint gob ain quartz glass company of France, the technology of melting quartz glass with high-frequency plasma flame can produce high-quality low hydroxyl quartz glass. The technology developed in recent years to continuously melt quartz glass lumps with hydrogen and oxygen flame has high benefits. In addition to circular sections, it can also melt quartz glass lumps with various special sections, and the resulting quartz glass lumps are in short supply. The technology of electrofusion of oversize lump developed by GE quartz glass company of the United States is very eye-catching, and its finished lump has a diameter of 2M and a weight of 4T. At present, there is no other manufacturer to manufacture. Recently, many new technologies have emerged in the manufacture of opaque quartz glass crucibles, such as multi-layer crucibles, annular electroflotation, etc. Most notably, more than half of the patents on quartz glass published in the past two decades are about the technology of manufacturing high-purity quartz glass by liquid raw material synthesis. The content covers almost all the technologies of synthetic quartz glass. Such as chlorine free raw materials, special burners, furnace structure, furnace body treatment, furnace atmosphere control, etc.

        China's quartz glass industry began after the founding of the people's Republic of China. At that time, some urgent problems were solved for the country under very difficult conditions. But before the reform and opening up, the development was slow, and gradually opened a big gap with the international level. In recent years, this phenomenon has been changed. Through the introduction of technology, digestion and absorption, as well as the innovation of scientific researchers, some new varieties, new technologies and new equipment have been continuously developed, such as doped quartz glass for laser technology and special light sources, Guangtong credit quartz glass tube, medical optical fiber, optical fiber irradiator, vertical gas refining Tuo industrial equipment, metal burner, hot top forming thick wall tube technology, quartz glass fiber and fiber cotton, etc. At present, the annual production of transparent quartz glass and products in China has reached more than 100000 tons, and the annual production of opaque quartz glass products has reached more than 2000 tons.


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