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Method for preparing quartz glass product with complex shape by fusion casting method

A quartz glass and complex shape technology, applied in glass pressing, glass molding, glass manufacturing equipment, etc., can solve the problems of low production efficiency, increased production cost, low utilization rate of raw materials, etc., to achieve cost saving, stable production capacity, Quality Controlled Effects

Pending Publication Date: 2022-03-15
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ordinary glass parts with complex shapes are often prepared by thermal processing methods such as bending, welding, and tube expansion, while the softening temperature of quartz glass is relatively high. If the temperature is slightly lowered, quartz glass will solidify, and its thermal processing is much more difficult than ordinary glass.
At present, the preparation of complex-shaped quartz glass products generally adopts the precision machining method with relatively mature technology, but this method is mainly based on mechanical grinding, using precision machining lathes, one piece at a time, and the production efficiency is low
In addition, the raw material utilization rate is low and the loss rate is high in the grinding process, which greatly increases the production cost

Method used

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  • Method for preparing quartz glass product with complex shape by fusion casting method
  • Method for preparing quartz glass product with complex shape by fusion casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] refer to figure 1 and 2 , a method for preparing complex-shaped quartz glass products by melting and casting, comprising the following steps of melting and casting:

[0038] S1. Preparation of equipment and raw materials: Prepare the melting and casting molding mold, spray the release agent on the inner surface of the mold, place it on the operation table of the melting and casting equipment, and put the quartz raw material into the glass melting crucible of the melting and casting equipment at the same time;

[0039] S2. Gas washing: Carry out the washing process of vacuuming, inert gas, and vacuuming in sequence on the melting and casting equipment, and cycle the washing process for 2 to 3 times, thereby reducing the impurity content of the gas atmosphere in the melting and casting equipment and avoiding the melting and casting of quartz glass The process introduces new impurities due to ambient gas;

[0040] S3. Fused quartz glass: in an inert gas atmosphere, the p...

Embodiment 2

[0046] A method for preparing complex-shaped quartz glass products by melting and casting, comprising the following steps of melting and casting:

[0047] Steps S1 and S2 are the same as those in Embodiment 1 and will not be described in detail;

[0048] S3. Fused quartz glass:

[0049] In an inert gas atmosphere, the air pressure is maintained at 1.5×10 5 Pa, heat up to 1500°C at a rate of 0.1°C / min, then slowly raise the temperature to 1850°C at a rate of 2.5°C / min, and then keep warm for 2 hours to completely melt the quartz raw material to a molten state;

[0050] S4. Quartz glass molding:

[0051] In the heat preservation stage, the molten quartz prepared in step S3 is poured into the casting mold, the pressing rod device of the melting and casting equipment is opened, and the molten glass is molded downward; the ambient temperature of the die-casting process is 1850°C, and the pressing rod force is 250N, the die-casting speed is 0.7mm / min, and the holding time is 1h. ...

Embodiment 3

[0058] A method for preparing complex-shaped quartz glass products by melting and casting, comprising the following steps of melting and casting:

[0059] Steps S1 and S2 are the same as those in Embodiment 1 and will not be described in detail;

[0060] S3. Fused quartz glass: in an inert gas atmosphere, the pressure is maintained at 1.9×10 5 Pa, heat up to 1500°C at a rate of 1.0°C / min, then slowly raise the temperature to 2150°C at a rate of 4.3°C / min, and then keep warm for 0.5h to completely melt the quartz raw material to a molten state;

[0061] S4. Quartz glass molding: In the heat preservation stage, pour the molten quartz prepared in step S3 into the melting and casting molding mold, open the pressing rod device of the melting and casting equipment, and press the glass molten liquid downward for molding; the ambient temperature of the die-casting process is 2150 ℃, the pressure rod force is 150N, the die-casting speed is 1mm / min, and the holding time is 0.5h. At th...

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Abstract

The invention relates to a method for preparing a quartz glass product with a complex shape by a casting method. The method comprises the steps of equipment and raw material preparation, gas washing, quartz glass melting, quartz glass forming, online heat treatment and demolding post-treatment. According to the method disclosed by the invention, by utilizing the plasticity of fused quartz and controlling process parameters such as the casting temperature, the heating and cooling rate, the pressure and the annealing temperature, the quartz glass product with stable performance and reliable quality and a complicated shape is prepared through one-step molding, and the problems of high viscosity and difficult molding in the casting process of the quartz glass are solved; compared with a traditional process, the preparation efficiency is improved, meanwhile, the loss rate is reduced, raw material waste is reduced, and a foundation is laid for batch, low-cost and high-efficiency production of quartz glass products in complex shapes.

Description

technical field [0001] The invention belongs to the technical field of quartz glass, and in particular relates to a process for preparing quartz products with complex shapes by melting and casting. Background technique [0002] Quartz glass is a special glass composed of a single component of silicon dioxide. It has excellent properties such as low thermal expansion coefficient, high temperature resistance, corrosion resistance, and good chemical stability. In particular, the thermal expansion coefficient is only 1 / 10 to 1 / 20 of ordinary glass. Widely used in optical communication, electric light source, optical lens and other fields. As the application scenarios of quartz glass continue to increase, its shape and style are also increasingly complex and shaped. [0003] Ordinary glass parts with complex shapes are often prepared by thermal processing methods such as bending, welding, and tube expansion. However, the softening temperature of quartz glass is relatively high. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B20/00C03B11/00
CPCC03B20/00C03B11/00Y02P40/57
Inventor 李瑛胡永峰龙昊孙家斌王常虹李文献朱明原金红明
Owner SHANGHAI UNIV
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