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Gel cast fused quartz crucible and manufacturing method thereof

A fused silica and injection molding technology, which is used in manufacturing tools, glass molding, glass manufacturing equipment, etc., can solve the problems of high temperature and humidity requirements for molding, uneven structure of injection molding, and limited use of molds. The effect of less investment, consistent density and short molding cycle

Inactive Publication Date: 2011-04-27
龙立华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the grouting molding process has many shortcomings that cannot be overcome: 1. The quality of the plaster mold used for grouting is unstable, and sometimes fluctuates to affect the quality of the crucible; 2. The green body strength of the grouting molding is low, and it is very difficult to produce large-sized crucibles. ; 3. The grouting molding structure is uneven, even interlayered, and the strength is low; 4. The number of molds used is limited, and the cost of the mold is high; 5. The cost of grinding the bottom of the crucible after firing is greatly increased; 6. The molding temperature and humidity, etc. High expectations
It increases the strength and fragility of the quartz crucible, but does not address the crucible density and the production of large crucibles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 50 parts of massive high-purity quartz sand (the mass percent of its components are: silicon dioxide > 99.75%, iron oxide < 38ppm, aluminum oxide < 950ppm, other unavoidable impurities, such as potassium oxide, sodium oxide , magnesium oxide or calcium oxide, etc.) into a ball mill for wet ball milling, the particle size is controlled within 10 microns, after aging for 8 days, add 25 parts each of 60 microns and 220 microns of high-purity fused silica sand, and then add propylene The amide monomer reagent is fully stirred until the temperature of the slurry reaches 35 degrees Celsius. After the physical and chemical indicators pass the test, the pressure is injected into the stainless steel mold after vacuum defoaming, and at the same time, it is supplemented by slight vibration. The vibration frequency is 30 times / min and the amplitude is 3 mm. Stand still for 20 minutes after pouring is complete. After being placed in a drying room at 50 degrees centigrade for 5 hours...

Embodiment 2

[0039] 45 parts of massive high-purity quartz sand (the mass percent of its components are: silicon dioxide > 99.8%, iron oxide < 25ppm, aluminum oxide < 400ppm, other unavoidable impurities, such as potassium oxide, sodium oxide , magnesium oxide or calcium oxide, etc.) into a ball mill for wet ball milling, the particle size is controlled within 20 microns, after aging for 10 days, add 20 parts of 80 micron high-purity fused silica sand, 35 parts of 300 micron high-purity fused silica sand Quartz sand, then add acrylamide monomer and other reagents and stir thoroughly until the temperature of the slurry reaches 40 degrees Celsius. After the physical and chemical indicators pass the test, the pressure is injected into the stainless steel mold after vacuum defoaming, and at the same time, it is supplemented by slight vibration. The vibration frequency is 38 times / minutes, with an amplitude of 5 mm. Stand still for 25 minutes after pouring is complete. Then place it in a dryi...

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Abstract

The invention discloses a gel cast fused quartz crucible which contains the following components by mass percentage: more than 99.74% of silica, less than 40ppm of ferric oxide, less than 1000ppm of alumina, and the balance inevitable impurities such as potassium, sodium, magnesium or calcium oxides. A green body of the gel cast fused quartz crucible is high in strength and density, and even in structure, and can be used for producing large-sized crucibles. The invention also discloses a manufacturing method of the gel cast fused quartz crucible.

Description

technical field [0001] The invention relates to a refractory kiln furniture, which belongs to the metallurgical industry. Specifically, it relates to a quartz crucible and a manufacturing method thereof, in particular to a pouring fused silica crucible and a manufacturing method thereof. Background technique [0002] Fused silica ceramic crucibles are consumables in the process of polycrystalline silicon ingot casting. Each polycrystalline furnace needs about 120 ceramic square crucibles per year. In 2007, the domestic demand for crucibles was about 120,000 per year, and it has shown explosive growth in the past two years this year. The mainstream technology of fused silica crucibles in the market is slipcasting. Grouting molding is a traditional molding process, which is characterized by high product density (1.89 ~ 2.0g / cm 3 ), the strength is higher. However, the grouting molding process has many shortcomings that cannot be overcome: 1. The quality of the plaster mold...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/06C03B20/00
Inventor 龙立华
Owner 龙立华
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