Sintering equipment and sintering method

Abstract

The invention provides sintering equipment and a sintering method, and is used for sintering a preform rod by heating raw material gas, the sintering equipment comprises a furnace tube and a heating system, the heating system is arranged on the periphery of the furnace tube and used for heating the raw material gas and sintering the preform rod, and the sintering equipment further comprises an adjusting mechanism, the adjusting mechanism comprises a heat insulation buffer plate and a rectifying plate, the rectifying plate is arranged at one end of the furnace tube and used for buffering and dispersing raw material gas entering the furnace tube, and the heat insulation buffer plate is arranged at the other end of the furnace tube and used for reducing the speed of discharging the raw material gas out of the furnace tube so as to control the pressure in the furnace tube. According to the sintering equipment, by arranging the heat insulation buffer plate and the rectifying plate, the gas temperature and the convection state in the furnace tube are adjusted, stable control over pressure fluctuation in the furnace tube is fundamentally achieved, and the rod radial and axial uniformity of the preform rod is effectively improved.

Description

Technical field [0001] The present application relates to the field of fiber optic preform, and more particularly to a sintering apparatus and a sintering method. Background technique [0002] The fiber preform is a high-purity stone-based rod for pulling an optical fiber, and the sintering process is one of the key steps in the fabrication process of the fiber preform. During the sintering process, the loose prefabricated rod prepared by external vapor deposition method is used, and the sintering of high temperatures 1300 ° C to 1500 ° C and atmosphere of high purity halogen gas can form transparent quartz sticks, conventional sintering equipment. Improvement of appearance parameters such as preform clause axial uniformity is usually achieved by adjusting the sintering temperature and speed, but temperature and speed tend to be affected by gas pressure fluctuations in the sintering furnace. At present, the control process of stabilizing the pressure is mainly to share the negati...

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Problems solved by technology

At present, the control process for stabilizing the pressure in the furnace mainly uses the flow rate of high-purity gas to share the negative pressure in the exhaust gas discharge pipe of the sintering furnace, so as to achieve the function of controlling the pressure in the sintering furnace, but this technology cannot fundamentally eliminate the The factors of pressure fluctuation in the furnace and the severe heat convection in the furnace body of the existing sintering equipment directly lead to pressure fluctuations, which are not conducive to the control of the axial uniformity of the preform rod diameter during the sintering process

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