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Direct reusing method for melted floating material of quartz crucible

A quartz crucible and floating material technology is applied in the field of crucible outer wall forming, which can solve the problems of complex cleaning process, increase production cost, low cost, etc., and achieve the effects of simplifying production process, reducing friction and reducing production cost.

Active Publication Date: 2017-05-10
INNER MONGOLIA OJING QUARTZ CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are usually two ways to deal with this part of quartz sand: one is to discard it directly, and when it is melted again, use good material—that is, high-purity quartz sand to fill the floating material layer, which will undoubtedly increase the production cost; One method is to pour out this part of the material, and after cleaning, it becomes "secondary mater

Method used

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  • Direct reusing method for melted floating material of quartz crucible
  • Direct reusing method for melted floating material of quartz crucible
  • Direct reusing method for melted floating material of quartz crucible

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The method for directly reusing the floating material after the quartz crucible is melted comprises the following steps:

[0027] 1), such as figure 1 As shown, after the first quartz crucible 3 is melt-molded, the previous quartz crucible 3 is taken out from the mold 1, and the floating material layer quartz sand 2 is retained in the mold 1, and the mold 1 is a metal mold and can be Make a pitching motion in the vertical direction, taking the pitch angle α of 90° as a reference when the center line of the mold is perpendicular to the horizontal plane, the pitch angle α of the mold 1 ranges from 90° to -10°.

[0028] 2), such as figure 2 As shown, the mold 1 is adjusted to a state where the pitch angle α is 90°, that is, the centerline of the mold is perpendicular to the horizontal plane, and then the mold 1 is rotated around its centerline to reach the molding speed ω1,

[0029]

[0030] Among them, D is the inches of the outer diameter of the crucible, K1 is the...

Embodiment 2

[0037] The method for directly reusing floating material after the quartz crucible is melted takes the melting of a 22-inch quartz crucible as an example, takes the forming coefficient K1 as 15, and calculates that the forming speed ω1 is 83 RPM. The coefficient K2 is 9, and the calculated mold speed ω2 is 9RPM. That is, after the first quartz crucible is melted, the crucible is taken out. During the process of taking out, the quartz sand of the floating material layer is kept in the mold, and the mold is erected so that the pitch angle is 90 degrees, and the rotation speed reaches 83RPM; when the quartz sand of the floating material layer After being evenly gathered to the arc transition position between the bottom of the mold and the side wall under the action of centrifugal force, the mold will pitch downward while continuing to rotate, and the pitch angle α is adjusted to -5°; then slowly reduce the mold speed to 9RPM over 9s , when a uniform floating material layer is for...

Embodiment 3

[0039] The method for directly reusing the floating material after the quartz crucible is melted takes the melting of a 24-inch quartz crucible as an example, taking the forming coefficient K1 as 14, and calculating the forming speed ω1 as 76 RPM. The coefficient K2 is taken as 10, and the calculated mold speed ω2 is 8RPM. That is, after the first quartz crucible is melted, the crucible is taken out. During the process of taking out, the quartz sand of the floating material layer is kept in the mold, and the mold is erected so that the pitch angle is 90 degrees and the rotation speed reaches 76RPM; when the quartz sand of the floating material layer After being evenly gathered to the arc transition position between the bottom of the mold and the side wall under the action of centrifugal force, the mold will pitch downward while continuing to rotate, and the pitch angle α is adjusted to -6°; then slowly reduce the mold speed to 8RPM over 11s , when a uniform floating material l...

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PUM

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Abstract

The invention relates to a direct reusing method for a melted floating material of a quartz crucible. The direct reusing method is characterized by comprising the following steps: after melting and forming of the quartz crucible are finished, and retaining quartz sand of a floating material layer in a mold, wherein the mold is a metal mold and can carry out pitching motion in the vertical direction, and the pitching angle alpha of the mold ranges from 90 degrees to minus 10 degrees; after the quartz sand of the floating material layer is uniformly gathered to an arc transition position of the bottom and the side wall of the mold under the effect of a centrifugal force, enabling the mold to downwards carry out pitching motion under the condition that the mold continues rotating, adjusting the pitching angle alpha to be greater than or equal to minus 10 degrees and less than 0 degree, and then gradually reducing the rotating speed of the mold, wherein alpha is an integer; and finally, under double effects of gravity and the centrifugal force, forming the floating material layer with even thickness on the peripheral inner wall of the mold. The purpose of reusing the floating material of the floating material layer is achieved, extra treating equipment and treating procedures are not required, costs are saved on the premise of ensuring the quality of crucible products, the production process is simplified, and the production period is shortened.

Description

technical field [0001] The invention relates to a method for directly reusing the floating material after the quartz crucible is melted, that is, the method for directly forming the outer wall of the crucible again by using the remaining floating material in the mold after the quartz crucible is melted. [0002] technical background [0003] Quartz glass crucible is used as a container for silicon melt when Czochralski method is used to pull single crystal silicon. Its production process is obtained by melting quartz sand in a mold of a specific shape by using an arc generated by graphite electrode discharge. After melting, there will be a layer of unfused quartz sand between the fused quartz crucible and the mold, which is called a floating material layer. The floating material layer facilitates the removal of the crucible, avoids the contact between the crucible and the mold, and reduces the pollution of the outer wall of the crucible, so the existence of the floating mate...

Claims

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Application Information

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IPC IPC(8): C03B40/02
CPCC03B40/02
Inventor 祝立君祝钦清于宏宇杜兴林
Owner INNER MONGOLIA OJING QUARTZ CO LTD