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Method for preparing novel long-life carbon/carbon composite crucible prefab

A technology of carbon composite materials and production methods, which is applied in the field of production of new long-life carbon/carbon composite material crucible preforms, can solve the problems of low mechanical properties in the hoop direction, longitudinal cracking, etc., and achieve the solution of low mechanical properties in the hoop direction , enhance the integrity and prolong the service life

Inactive Publication Date: 2019-02-19
XIAN CHAOMA SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method takes continuous carbon fiber single yarn as raw material, winds the carbon fiber single yarn along the direction of 90° axial direction of the crucible and uses carbon cloth to locally reinforce the arc surface area of ​​the bottom, and wraps the carbon fiber single yarn crucible along the axial direction of 0° Winding in the direction of ~±80° enhances the axial integrity of the crucible preform, avoids the defects in the mechanical properties of the hoop caused by the hoop seam of the carbon cloth layer, and improves the hoop stretch of the final carbon / charcoal crucible Strength, which solves the problems of low circumferential mechanical properties and longitudinal cracking during use of the existing crucibles for single crystal silicon drawing furnaces, and prolongs the service life of carbon / carbon crucibles

Method used

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  • Method for preparing novel long-life carbon/carbon composite crucible prefab
  • Method for preparing novel long-life carbon/carbon composite crucible prefab
  • Method for preparing novel long-life carbon/carbon composite crucible prefab

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Experimental program
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Embodiment 1

[0031] The manufacturing method of this embodiment includes the following steps:

[0032] Step 1. Determine that the thickness of the carbon / carbon composite material crucible to be processed is 26mm, the inner diameter of the straight cylinder section is 698mm, and the diameter of the straight cylinder section 1 is 678mm, the height is 320mm, and the outer surface structure and size of the arc surface at the bottom are the same as those to be processed. The inner surface structure of the carbon / carbon composite material crucible is a wooden mandrel with the same size, and a layer of 10mm thick rubber foam is pasted on the outer surface of the wooden mandrel, such as figure 1 As shown, the first carbon fiber single yarn 3 is continuously wound on the outer surface of the straight tube section 1 of the mandrel along the direction 90° to the axial direction of the carbon / carbon composite crucible to be processed, and then a layer of circular Carbon cloth 4 wraps the outer surfac...

Embodiment 2

[0039] The difference between this embodiment and Embodiment 1 is: the carbon fibers used in the first carbon fiber single yarn, the second carbon fiber single yarn and the carbon cloth are all viscose-based 1.5K carbon fibers, and the carbon cloth surface density is 300g / m 2 , the mass percentage of carbon fiber mesh is 40%, and the needling density is 10 needles / cm 2 , the density of the final carbon / carbon composite crucible preform is 0.40g / cm 3 , the inner diameter is 698mm, the outer diameter is 750mm, and the height is 530mm.

Embodiment 3

[0041] The difference between this embodiment and Embodiment 1 is that the carbon fibers used in the first carbon fiber single yarn, the second carbon fiber single yarn and the carbon cloth are all pitch-based 24K carbon fibers, and the surface density of the carbon cloth is 600g / m 2 , the mass percentage of carbon fiber mesh is 10%, and the needling density is 40 needles / cm 2 , the density of the final carbon / carbon composite crucible preform is 1.00g / cm 3 , the inner diameter is 698mm, the outer diameter is 750mm, and the height is 530mm.

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Abstract

The invention discloses a method for preparing a novel long-life carbon / carbon composite crucible prefab. The method comprises the steps that 1, a carbon fiber-carbon cloth coating layer is obtained by continuously winding carbon fiber single yarn around the outer surface of a straight cylinder section of a core model in the direction of which the inclined angle with the axial direction of the crucible is 90 degrees and adopting carbon cloth to coat the outer surface of a bottom cambered surface of the core model; 2, a carbon fiber coating layer is obtained by continuously winding carbon fibersingle yarn around the entire carbon fiber-carbon cloth coating layer in the direction of which the inclined angle with the axial direction of the crucible is 0-<+ / ->8 degrees; 3, continuous winding,coating and entire continuous winding are repeated alternately many times, and needling is performed layer by layer to obtain the carbon / carbon composite crucible prefab. The method for preparing thenovel long-life carbon / carbon composite crucible prefab has the advantages that the continuous carbon fiber single yarn is taken as the raw material, and the carbon fiber single yarn is winded in thedirection of which the inclined angle with the axial direction of the crucible is 90 degrees and in the direction of which the inclined angle with the axial direction of the crucible is 0-<+ / ->8 degrees respectively, thereby improving the integrality of the crucible prefab, improving the annular tensile strength of the carbon / carbon crucible, and prolonging the service life of the carbon / carbon crucible.

Description

technical field [0001] The invention belongs to the technical field of crucible preparation, and in particular relates to a method for manufacturing a novel long-life carbon / carbon composite material crucible preform. Background technique [0002] The monocrystalline silicon pulling furnace is a device for producing monocrystalline silicon by the Czochralski method. Its working principle is to place the polycrystalline silicon material in a double-layer crucible composed of a quartz crucible and a carbon crucible, and heat it under the protection of an inert gas. The silicon material is melted at 1400℃~1700℃, and the crystal grain grows under the traction to form a single crystal silicon rod. [0003] The carbon / carbon composite material crucible is one of the core thermal field components in the single crystal silicon Czochralski furnace. During the preparation process of silicon single crystal, the carbon / carbon crucible is next to the quartz crucible containing the silico...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/52
CPCC04B35/52C04B35/83
Inventor 张灵玉侯卫权闵明张旭辉赵上元邢如鹏孟凡才
Owner XIAN CHAOMA SCI TECH