A kind of preparation device of quartz glass

Abstract

The invention discloses a device for manufacturing high-purity quartz glass by using natural quartz sand or synthetic quartz powder. The device comprises a furnace cavity (5), a material supply device (2), a spray lamp (4), a rotary support (7) and a base plate (11), wherein the spray lamp (4), the rotary support (7) and the base plate (11) are arranged in the furnace cavity. The quartz sand or the synthetic quartz powder is accurately fed into the oxyhydrogen flame spray lamp through the material supply device, incompletely molten particles are formed under flames and gradually deposit on the base plate on the rotary support to form a cellular quartz glass body. The utilization rate of the raw materials is high, a manufactured quartz glass material is low in hydroxyl and impurity content and small in size fluctuation, and follow-up processing costs are reduced.

Description

technical field [0001] The invention belongs to the technical field of optical fiber and cable, and more specifically relates to a preparation method and a preparation device of quartz glass. Background technique [0002] Due to its excellent high temperature resistance, thermal expansion coefficient, thermal shock resistance, chemical stability, insulation and optical properties, quartz glass is widely used in light sources, electronics, optical communications, instruments, lasers, aerospace, nuclear technology and national defense and other high-tech fields. At present, the mainstream production methods of high-purity quartz glass are chemical synthesis, electric melting, gas refining and plasma spraying. [0003] The chemical synthesis method is to use silicon-containing precursors (such as SiCl 4 etc.), heated by flame, reacted with hydrogen and oxygen, hydrolyzed to generate silica soot body, deposited on the target target to form porous quartz body, and then dried an...

AI Technical Summary

Problems solved by technology

The electrofusion method is to place the quartz sand in a high-temperature-resistant container and heat it through an electric furnace to directly melt the quartz sand to form quartz glass. The purity and uniformity of the quartz glass prepared by this method are not high, and bubbles are easily generated inside. It is generally used for Preparation of quartz products with lower requirements; plasma spraying technology is to melt and spray quartz sand on the target target through a plasma flame to directly form transparent quartz glass. This technology has been used in some enterprises to prepare high-purity quartz columns and quartz tubes. However, due to the limitation of high equipment cost, high energy consumption and long production cycle, it has not been widely used; the gas refining method is currently the most widely used preparation technology in the quartz product industry. The quartz sand is heated by a hydrogen-oxygen flame and fused and deposited On the target target, quartz glass is directly formed by heating the flame. The content of bubbles and defects in the quartz glass prepared in the early stage of this method is relatively high. With the development of technology, the prepared quartz glass has been improved in size and performance. Improvement, the patent CN105314825A mentioned that adding low-pressure acetylene to the flame can improve the uniformity of the quartz interior; the patent JP6122131A replaced the hydrogen-oxygen flame with CO and O 2 , thereby reducing the content of hydroxyl groups in the quartz glass, but due to CO and O 2 The heat of combustion is only 1 / 3 of the hydrogen-oxygen flame, which prolongs the production cycle and introduces the toxic gas CO

Although the production cost of gas refining equipment is low and it is easy to realize large-scale production, the produced quartz glass generally has a high hydroxyl content (above 150ppm), bubbles exist inside, and the stress distribution is uneven

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