Preparation method of cover plate for polycrystalline ingot furnace thermal field

A technology of polycrystalline ingot and cover plate, which is applied in the field of preparation of carbon/carbon composite material cover plate for polycrystalline ingot casting furnace, can solve the problems of delamination cracking, carbon fiber damage, overall performance reduction, etc., and prolong the service life , good coating effect and low cost

Inactive Publication Date: 2016-11-23
北京赛恩高科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the C / C composite material cover is mainly carbon cloth laminated cover or carbon fiber felt needle punched cover. The carbon cloth laminated cover does not have any fibers in the Z direction, so it is easy to cause delamination and cracking; and the carbon fiber felt needle punched The cover plate introduces carbon fiber in the Z direction, but at the same time, the overall performance is reduced due to the damage of the carbon fiber in the plane direction due to needle punching
In addition, none of the cover plates currently in use offer a silicon carbide coating

Method used

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  • Preparation method of cover plate for polycrystalline ingot furnace thermal field

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Select Toray T700-12K polyacrylonitrile-based carbon fiber, weave and shape it in a 2.5D shallow cross-linking method to form a carbon fiber preform; the preform density is 0.50g / cm 3 ;The size of the preform is 1000×1000×10mm;

[0027] (2) Select a thermosetting phenolic resin with a solid content of about 60% as the impregnating agent, put the carbon fiber preform into a vacuum impregnation tank, and inhale the phenolic resin after vacuuming for 30 minutes until the resin completely covers the preform;

[0028] (3) Place the resin-impregnated carbon fiber prefabricated body on a flat-plate hot press for hot-press curing, the curing temperature is 150°C, and the curing time is 3 hours; before curing, adjust the distance between the press platen and press the thickness of the prefabricated body to 8.5mm;

[0029] (4) Put the cured finished product into a carbonization furnace for carbonization treatment. During the treatment, the temperature is raised to 800 °C at a...

Embodiment 2

[0035] (1) Select Toray T700-6K polyacrylonitrile-based carbon fiber, and weave and shape it in a 2.5D shallow cross-linking method to form a carbon fiber prefabricated body; the prefabricated body density is 0.60g / cm 3 ;The size of the preform is 1000×1000×10mm;

[0036] (2) Select a thermosetting phenolic resin with a solid content of about 55% as the impregnating agent, put the carbon fiber preform into a vacuum impregnation tank, and inhale the phenolic resin after vacuuming for 30 minutes until the resin completely submerges the preform;

[0037] (3) Place the resin-impregnated carbon fiber prefabricated body on a flat-plate hot press for hot-press curing, with a curing temperature of 130°C and a curing time of 5 hours; before curing, adjust the distance between the press plates of the press to press the thickness of the prefabricated body to 9mm;

[0038] (4) Put the solidified finished product into a carbonization furnace for carbonization treatment. During the treatmen...

Embodiment 3

[0044] (1) Select Toray T700-12K polyacrylonitrile-based carbon fiber, weave and shape it in a 2.5D shallow cross-linked way to form a carbon fiber preform; the preform density is 0.40g / cm 3 ;The size of the preform is 1000×1000×10mm;

[0045] (2) Select a thermosetting phenolic resin with a solid content of about 65% as the impregnating agent, put the carbon fiber preform into a vacuum impregnation tank, and inhale the phenolic resin after vacuuming for 30 minutes until the resin completely submerges the preform;

[0046] (3) Place the resin-impregnated carbon fiber prefabricated body on a flat-plate hot press for hot-press curing, the curing temperature is 160°C, and the curing time is 1h; before curing, adjust the distance between the press platen and press the thickness of the prefabricated body to 8mm;

[0047] (4) Put the cured finished product into a carbonization furnace for carbonization treatment. During the treatment, the temperature is raised to 700°C at a heating ra...

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Abstract

The invention provides a preparation method of a cover plate for a polycrystalline ingot furnace thermal field. The method includes the following steps of firstly, selecting carbon fiber, and weaving the carbon fiber to form a carbon fiber prefabricated body; secondly, putting the carbon fiber prefabricated body into a resin impregnation solution to be impregnated; thirdly, conducting thermal compression and carbonization treatment on the product; fourthly, conducting compaction treatment and high-temperature purification treatment on the product; fifthly, preparing a silicon carbide coating on the surface of the product; sixthly, conducting machining to obtain the final product. The method is easy and convenient to operate, high in integrity, free of layering and cracking in the use process and long in service life.

Description

technical field [0001] The invention relates to a method for preparing a carbon / carbon (C / C) composite material cover plate for a polycrystalline ingot casting furnace. Background technique [0002] C / C composite cover plates are widely used in high-temperature industrial equipment such as polycrystalline silicon ingot furnaces. Their performance directly affects the quality of silicon ingots. Their life and use effects play a key role in the energy consumption and cost control of high-temperature industrial equipment. At present, there are two types of cover plates used in polycrystalline ingot casting furnaces: graphite cover plate and C / C composite material cover plate. The graphite cover plate is easy to break during use due to its inherent brittleness, and it must be very Be careful, otherwise it is easy to break. The C / C composite material uses carbon fiber reinforcement, and the cover plate avoids the shortcomings of the graphite cover plate to a certain extent. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B41/50C04B41/87
Inventor 徐国峰
Owner 北京赛恩高科技有限公司
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