Unlock instant, AI-driven research and patent intelligence for your innovation.

Making method of crucible interior surface demolding coating layer

A production method and inner surface technology, applied in the G6 full-melting high-efficiency ingot casting process, and the production field of release coatings on the inner surface of the crucible, can solve problems such as sticking to the pot, inability to judge the thickness of the coating, and silicon nitride powder rebound, etc. Achieve the effect of avoiding sticking pan

Active Publication Date: 2016-11-09
江苏美科太阳能科技股份有限公司
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The advantage is that the coating is relatively uniform, but during the spraying process, there will be a large amount of silicon nitride powder rebounding, and the solid-liquid surface of the silicon ingot is the most likely to stick to the pan. If there is a lot of silicon nitride powder rebounding during the spraying process, it is very easy to Sticking to the pan occurs, and the coating thickness cannot be judged by the naked eye on the crucible after spraying

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Making method of crucible interior surface demolding coating layer
  • Making method of crucible interior surface demolding coating layer
  • Making method of crucible interior surface demolding coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for manufacturing a release coating on the inner surface of a crucible, comprising the steps of:

[0024] (1) Mix 130g of silicon nitride powder with 50g of water and 75g of silica sol at 22°C, and stir evenly with a glass rod for 20 minutes to obtain a silicon nitride slurry①;

[0025] (2) Place the crucible on a rotary spray rack and heat it to 60°C;

[0026] (3) Use a soft brush to brush silicon nitride slurry horizontally at 30 places in the first brushing area of ​​the inner wall of the crucible 32 ①, and brush the silicon nitride slurry from top to bottom at the four edges of the first brushing area on the inner wall of the crucible ①, the first brushing area is a rectangular structure area, the distance between the bottom edge of the first brushing area and the bottom surface of the crucible is 25cm, and the distance between the top edge of the first brushing area and the bottom surface of the crucible is 35cm;

[0027] (4) Leave the crucible to dry;

...

Embodiment 2

[0032] A method for manufacturing a release coating on the inner surface of a crucible, comprising the steps of:

[0033] (1) Mix 120g of silicon nitride powder with 30g of water and 55g of silica sol at 20°C, and stir evenly with a glass rod for 25min to obtain a silicon nitride slurry①;

[0034] (2) Place the crucible on a rotary spray rack and heat it to 50°C;

[0035] (3) Use a soft brush to brush the silicon nitride slurry ① horizontally on the first brushing area of ​​the inner wall of the crucible, and brush the silicon nitride slurry ① from top to bottom on the four edges of the first brushing area on the inner wall of the crucible. The first brush area is a rectangular structure area, the distance between the bottom edge of the first brush area and the bottom surface of the crucible is 25cm, and the distance between the top edge of the first brush area and the bottom surface of the crucible is 35cm;

[0036] (4) Leave the crucible to dry;

[0037] (5) Mix and stir 2...

Embodiment 3

[0041] A method for manufacturing a release coating on the inner surface of a crucible, comprising the steps of:

[0042] (1) Mix 150g of silicon nitride powder with 70g of water and 85g of silica sol at 25°C, and stir evenly with a glass rod for 30 minutes to obtain a silicon nitride slurry①;

[0043] (2) Place the crucible on a rotary spray rack and heat it to 65°C;

[0044] (3) Use a soft brush to brush the silicon nitride slurry ① horizontally on the first brushing area of ​​the inner wall of the crucible, and brush the silicon nitride slurry ① from top to bottom on the four edges of the first brushing area on the inner wall of the crucible. The first brush area is a rectangular structure area, the distance between the bottom edge of the first brush area and the bottom surface of the crucible is 25cm, and the distance between the top edge of the first brush area and the bottom surface of the crucible is 35cm;

[0045] (4) Leave the crucible to dry;

[0046] (5) Mix and s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a making method of a crucible interior surface demolding coating layer. The method comprises the following steps: 1, preparing a silicon nitride slurry 1; 2, placing a crucible on a rotary spraying rack; 3, brushing the silicon nitride slurry 1 on the primary brushing area of the inner sidewall of the crucible in a horizontal direction by using a banister brush; 4, allowing the crucible to stand for drying; 5, uniformly spraying the residual silicon nitride slurry 2 on the bottom surface through a spray gun; 6, spraying the silicon nitride slurry 3 on the inner sidewall of the crucible through the spray gun; and 7, drying the sprayed crucible on the spraying rack for 20 min or above to dry the coating layer. The coating layer avoids pan sticking in the solid-liquid position, and effectively avoids the pan sticking in the corner angle of the bottom.

Description

technical field [0001] The invention relates to the field of polysilicon ingot casting for solar cells, and relates to a method for manufacturing a release coating on the inner surface of a crucible, specifically for the G6 full-melting high-efficiency ingot casting process. technical background [0002] In the existing ingot industry, the traditional G6 crucible coating method is as follows: 800g of silicon nitride powder, 2000ml of water and 300ml of silica sol are fully mixed and stirred in a water bath at 50°C, the crucible is heated to above 50°C, and sprayed into the crucible through a spray gun surface. [0003] Its advantage is that the coating is relatively uniform, but during the spraying process, a large amount of silicon nitride powder will rebound, and the solid-liquid surface of the silicon ingot is the most likely to stick to the pan. If there is a lot of silicon nitride powder rebounded during the spraying process, it is very easy to Sticking to the pan occu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B41/87
CPCC04B41/5066C04B41/87C04B41/5024
Inventor 吴庆路景刚王禄宝
Owner 江苏美科太阳能科技股份有限公司