Large-caliber thick-wall quartz glass tube and preparation method thereof

Abstract

The invention discloses a large-caliber thick-wall quartz glass tube. Quartz sand is used as a basic raw material in parts by weight, and is compounded with a microelement additive in parts by weight,accounting for 3.1% to 4.2% of the parts (by weight) of the quartz sand, wherein the microelement additive is prepared from the following raw materials in weight ratios: 0.4 to 0.6 of sodium chlorate, 0.1 to 0.3 of ammonium chloride, 0.2 to 0.4 of antimonous oxide and 0.3 to 0.5 of cerous nitrate. The sodium chlorate, the ammonium chloride and the cerous nitrate are mixed, added with water, dissolved and made into an aqueous solution; the antimonous oxide is added into hydrochloric acid and made into an acidic solution; the aqueous solution, the acidic solution and high-purity quartz sand aremixed, then are sent into a sand baking machine to carry out oven-drying swelling, next, are subjected to magnetic separation and screening, and are put into a continuous melting furnace to carry outdrawing forming; a used former is provided with an air flow convoluting chamber in an air vent hole; and the air flow convoluting chamber is used for achieving dilatation and flow stabilizing effectsand ensuring the forming precision of the tube wall of a glass tube. The large-caliber thick-wall quartz glass tube prepared by the invention has the characteristics of being excellent in high temperature resistance, high in hardness, slight in thermal expansion, free from air bubbles and free from air lines.

Description

technical field [0001] The invention relates to the technical field of preparation of quartz glass, in particular to a large-diameter thick-walled quartz glass tube; the invention also relates to a method for preparing the aforementioned large-diameter thick-walled quartz glass tube. Background technique [0002] Large-diameter thick-walled quartz glass tube has specific high hardness, small thermal expansion, stable structural size, chemical corrosion resistance (except hydrofluoric acid), radiation resistance, high optical uniformity, high temperature resistance, rapid cooling and heat resistance, high mechanical strength, etc. It is widely used in chemical industry, civil use, aviation, electronics, solar photovoltaic, medical equipment and other fields. It is the first choice for the quartz glass deep processing industry. It has a good market prospect and great economic benefits. The existing large-aperture thick-walled quartz glass tubes are generally produced by electr...

AI Technical Summary

Problems solved by technology

The existing large-aperture thick-walled quartz glass tubes are generally produced by electric melting furnaces. Quartz glass tubes with a diameter greater than 300 mm and a wall thickness greater than 120 mm have insufficient molding control technology, often with low output, low molding quality, and bubbles. The defect of high production cost, and the need to use the secondary molding machine for tube expansion molding, the preparation process is complicated, and cannot meet the production needs

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