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Resin isobaric liquid-phase impregnation densification method for rapidly filling pores inside carbon/carbon composite material

A carbon composite material, liquid phase impregnation technology, applied in the field of composite material densification treatment, can solve the problems of limiting the popularization and application of carbon/carbon composite materials, high manufacturing cost, hindering large-scale application, etc., to reduce the number of cycles and The effect of large pore residual amount, shortening production cycle and improving densification efficiency

Active Publication Date: 2013-06-12
山东道普安制动材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing resin impregnation technology has the disadvantages of low densification efficiency and long preparation cycle, resulting in high manufacturing cost, which limits the popularization and application of carbon / carbon composite materials, especially directly hinders the development of carbon / carbon composite materials. Large-scale application of / carbon composite crucibles in the semiconductor industry such as single crystal silicon drawing, polycrystalline silicon refining and smelting, and ingot casting

Method used

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  • Resin isobaric liquid-phase impregnation densification method for rapidly filling pores inside carbon/carbon composite material
  • Resin isobaric liquid-phase impregnation densification method for rapidly filling pores inside carbon/carbon composite material
  • Resin isobaric liquid-phase impregnation densification method for rapidly filling pores inside carbon/carbon composite material

Examples

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Embodiment 1

[0041] Three carbon / carbon crucibles for Czochralski monocrystalline silicon were produced by resin isobaric liquid phase impregnation (PIP) densification method, and the size of the crucible was Φ500×450mm. Technical indicators require bulk density ≥ 1.65g / cm 3 .

[0042] The resin PIP process includes the use of a vacuum autoclave with an isobaric recovery device for the impregnating liquid (structure such as figure 1 shown), the equal-pressure recovery device is a pressure-bearing recovery tank 6 located outside the vacuum autoclave 1, which communicates with the bottom of the impregnation cylinder 2 built in the vacuum autoclave 1 through pipelines and valves 5, and passes through the pressure-bearing Vent pipe 7 is communicated with vacuum autoclave 1, and vacuum autoclave 1 and pressure-bearing recovery tank 6 maintain gas ventilation and equal pressure; the steps are as follows:

[0043] First, put 3 carbon fiber prefabricated crucibles (carbon / carbon crucible prefabr...

Embodiment 2

[0048] Produce 3 carbon / carbon crucibles for smelting and purifying polysilicon, crucible size: Φ600×600mm. Technical indicators require bulk density ≥ 1.55g / cm 3 .

[0049] First, put 3 carbon fiber prefabricated crucibles in the impregnation cylinder of the vacuum autoclave, heat up and evacuate, when the temperature reaches 80°C, under the condition of vacuum degree of 1000±100Pa, keep the temperature for 60min, keep the vacuum degree and temperature conditions, put Prepare a preheated 120°C benzoxazine resin as the impregnating solution, and pour it into the impregnation cylinder; then, fill it with pure nitrogen to 4.0±0.1MPa, keep it at constant pressure for 60 minutes; Immersion solution; then, continue to heat up under constant pressure, when the temperature is 240±10°C, keep it warm for 60 minutes; then, release the gas to normal pressure, open the tank cover, take out the workpiece and place it in the working chamber of the carbonization furnace, replace the air wit...

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Abstract

The invention relates to a resin isobaric liquid-phase impregnation densification method for rapidly filling pores inside a carbon / carbon composite material. The method comprises the following steps of by using a PIP (precursor impregnation and pyrolysis) process and a vacuum autoclave with an isobaric impregnation recovery device, and taking nitrogen as a protective gas, using an impregnating solution to impregnate a carbon fiber perform or low-density C / C body workpiece in a vacuum; allowing the impregnating solution to infiltrate into the workpiece at nitrogen pressure; isobarically recovering excess impregnating solution; continuing to isobarically heat to thermally set resin; and then carbonizing the resin into a carbon substrate for filling the pores inside the workpiece. The carbon / carbon composite material component with the required density is obtained by multiple circulating operations. The period of the method is short, and the excess impregnating solution which does not filtrate into the workpiece is isobarically recovered, so that the resin is prevented from reversely filtrating, the resin consumption and pure nitrogen consumption are reduced, and the densification efficiency and the densification uniformity are improved.

Description

technical field [0001] The invention relates to a resin isobaric liquid phase impregnation (PIP) densification method for quickly filling the internal pores of carbon / carbon composite materials, which belongs to the technical field of densification treatment of composite materials. Background technique [0002] Carbon fiber-reinforced carbon-based composites (referred to as carbon / carbon, C / C) are composite materials that use carbon or graphite fibers as reinforcements and carbon or graphite as a matrix. It has special properties such as high temperature resistance, good thermal conductivity, thermal shock resistance, low ablation rate, high strength at high temperature, and certain chemical inertness. It is an ideal high temperature structure, high temperature friction, high temperature conductive heating and anti-ablation material. In recent years, with the reduction of carbon fiber raw materials and manufacturing costs, the application of C / C composite materials is gradua...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622
Inventor 刘汝萃刘汝强
Owner 山东道普安制动材料有限公司
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