Mould and method for casting quartz crucibles

A casting molding, quartz crucible technology, applied in the field of quartz ceramic processing, can solve the problems of reduced strength at grinding, poor exhaust, long casting molding time, etc., to achieve product quality assurance, reduce molding time, and shorten molding time. Effect

Active Publication Date: 2012-06-13
徐州协鑫太阳能材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) Five-hole pouring method; it is to open five holes in the upper cover for pouring production, but this method is basically not used now due to many defects
[0005] 1. It takes a long time for pouring and molding, generally takes 40-50 hours, which affects the output and increases the cost
[0006] 2. Bubbles tend to gather at the bottom of the crucible, causing the product to be scrapped
[0007] 3. The large sprue leads to low strength at the sprue, which is prone to cracking and makes the product scrapped
[0008] 4. The amount of grinding at the Pozi groove is very large, which increases the work intensity and environmental pollution
Grinding will reduce the strength of the grinding place, and the vibration of grinding will easily cause the product to crack and make the product scrapped
[0009] 5. Due to the poor exhaust of the existing single-hole pouring, the slurry and the air contact for a long time during pouring. Since the quartz crucible slurry contains organic matter, a crust will appear after contacting the air, which will affect the strength of the crucible and easily cause internal crack defects.

Method used

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  • Mould and method for casting quartz crucibles
  • Mould and method for casting quartz crucibles
  • Mould and method for casting quartz crucibles

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Experimental program
Comparison scheme
Effect test

Embodiment

[0038] 1. Prepare quartz slurry, vacuum pouring tank, plaster mold body and pouring platform (one corner of the pouring platform is 5 degrees higher than the opposite corner to the ground, that is, a bracket).

[0039] 2. Put the quartz slurry into the vacuum pouring tank and vacuumize for 50 minutes.

[0040] 3. Assemble the main body of the gypsum mold, and add a funnel with a height of 20cm to the grout filling hole on the mold cover and the exhaust grout filling hole.

[0041] 4. Put the combined gypsum mold body on the pouring platform, pay attention to place the direction of the pouring port on the corner of the bottom of the pouring platform (that is, the lowest point of the crucible pouring forming area), and place the direction of the exhaust port at the height of the pouring platform ( That is, the highest point in the casting area of ​​the crucible).

[0042] 5. Lift the vacuumed slurry and the vacuum pouring tank to the pouring platform, which is higher than the u...

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PUM

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Abstract

The invention discloses a mould for casting quartz crucibles, which comprises a mould main body. The mould main body comprises a mould cover, a periphery side wall and a mould core arranged in the mould cover and the periphery side wall. A crucible casting area is formed among the mould cover, the periphery side wall and the mould core, an open hole communicated with the crucible casting area is arranged on the mould cover, and a casting port communicated with the crucible casting area is arranged on the periphery side wall. The invention further discloses a method using the mould to cast crucibles, which comprises the following steps of feeding quartz slurry into a vacuum casting tank to be vacuumed, communicating the vacuum casting tank with the casting port of the mould, and connecting a funnel with the open hole on the mould cover. Thus, the quartz slurry can fill the whole crucible casting area through the casting port, and then the mould is placed horizontally to be formed. The mould and the method can reduce forming time of crucibles and improve percent of pass of the crucibles.

Description

technical field [0001] The invention relates to the technical field of quartz ceramic processing, in particular to a mold and method for casting a quartz crucible. Background technique [0002] There are two ways to prepare quartz crucible for polysilicon ingot: slip casting and gel casting. Among them, the grouting molding can be divided into two types: single-side grouting and double-side grouting. Double-sided slurry casting is adopted by most manufacturers due to its stable product quality, easy control of size and high strength. [0003] The existing double-sided pouring process mainly adopts the following two methods: (1) single-hole pouring method, that is, pouring with a hole in the middle of the upper cover of the mold, and opening a Pozi groove on the upper cover with the opening as the center to fill the corners of the crucible and exhaust. (2) Five-hole pouring method; that is, five holes are opened in the upper cover for pouring production, but this method is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B7/00B28B1/14
Inventor 廖祖伟闫继顺王金波龚承
Owner 徐州协鑫太阳能材料有限公司
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