Preparation method of pyrolytic carbon coating

A technology of pyrolytic carbon and coating, which is applied in the direction of coating, metal material coating process, gaseous chemical plating, etc., can solve the problems of uneven pyrolytic carbon coating, achieve simple preparation method and avoid vacuuming operation , the effect of uniform thickness

Inactive Publication Date: 2015-04-29
林荣铨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a preparation method of pyrolytic carbon coating, which solves the defects that xenon gas is easy to diffuse into graphite and the prepared pyrolytic carbon coating is uneven

Method used

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Examples

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Effect test

preparation example Construction

[0015] A method for preparing a pyrolytic carbon coating, comprising the steps of: (1) providing a chemical vapor deposition furnace with a furnace body, wherein a corundum tube is provided throughout the furnace body, and a circular tube is arranged on the inlet end of the corundum tube. Holes for tungsten rod insertion, the other end of the tungsten rod is connected to the graphite column, and the graphite column faces the gas outlet end of the corundum tube for pasting the graphite substrate; (2) immerse the graphite substrate in the precursor solution, where the precursor solution is SR249 and xylene It is configured according to the volume ratio of (0.3-1.0): 1; (3) Take out the graphite matrix after immersing it for 24 hours, and place it in the middle of the corundum tube; (4) Introduce argon gas into the corundum tube, and Raise the temperature of the furnace body to 1100-1250°C; (5) continue to feed argon and methane, and set the mass ratio of methane and argon to (800...

Embodiment 1

[0023] Immerse the graphite substrate in the precursor solution, where the precursor solution is made of SR249 and xylene at a volume ratio of 0.3:1; take out the graphite substrate after soaking it for 24 hours, stick it on the bottom surface of the graphite column with high temperature adhesive, and Put it into the corundum tube, keep the graphite substrate suspended in the middle of the corundum tube. Introduce argon, the gas flowmeter cleans the argon pipeline for 8 minutes, then control the argon flow rate to 160ml / min through the flowmeter, and raise the temperature to 1100℃ at a rate of 9℃ / min; The mass ratio of the gas is 800:275; stop feeding methane after 50 minutes, control the argon flow rate to 160ml / min, and cool to room temperature with the furnace; the permeability coefficient obtained on the graphite substrate is 1.77*10 -8 cm 2 / (s.cmHg) of pyrolytic carbon coating.

Embodiment 2

[0025] Immerse the graphite substrate in the precursor solution, where the precursor solution is SR249 and xylene with a volume ratio of 0.5:1; take out the graphite substrate after soaking it for 24 hours, and stick it on the bottom surface of the graphite column with high temperature glue, and put it together Put it into the corundum tube, keep the graphite substrate suspended in the middle of the corundum tube. Introduce argon, and the gas flowmeter cleans the argon pipeline for 10 minutes, then controls the argon flow rate to 170ml / min through the flowmeter, and raises the temperature to 1150℃ at a rate of 9.5℃ / min; The mass ratio of the gas is 900:300; stop feeding methane after 80 minutes, control the argon flow rate to 170ml / min, and cool to room temperature with the furnace; the permeability coefficient obtained on the graphite substrate is 8.48*10 -9 cm 2 / (s.cmHg) of pyrolytic carbon coating.

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Abstract

The invention provides a preparation method of a pyrolytic carbon coating. The preparation method comprises the following steps: (1) providing a chemical vapor deposition furnace with a furnace body, wherein a corundum pipe is arranged through the furnace body, a circular hole is formed on the end face of the air inlet end of the corundum pipe and used for a tungsten rod to be inserted, the other end of the tungsten rod is connected with a graphite column, and the air outlet end of the graphite column toward the corundum pipe is used for adhering a graphite matrix; (2) impregnating the graphite matrix in a precursor solution, wherein the precursor solution is prepared from SR249 and xylene in a volume ratio of (0.3-1.0): 1; (3) after impregnating the graphite matrix for 24 hours, taking out the graphite matrix and suspending the graphite matrix in the middle part of the corundum pipe; (4) introducing argon into the corundum pipe and raising the temperature of the furnace body to 1100-1250 DEG C; (5) continuously introducing argon and methane, wherein the mass ratio of methane and argon is (800-1000): (275-350); and (6) closing methane and continuously keeping introduction of argon, wherein the graphite matrix is furnace-cooled so as to obtain the pyrolytic carbon coating on the graphite matrix.

Description

technical field [0001] The invention relates to the field of pyrolytic carbon coatings, in particular to a preparation method of pyrolytic carbon coatings. Background technique [0002] With the improvement of people's material level, the contradiction between the people's growing energy demand and the relative scarcity of renewable energy has become the main contradiction. In this situation, as one of the fourth-generation reactor types, the thorium-based molten salt reactor came into being. In thorium-based molten salt reactors, nuclear graphite is mainly used as a neutron moderator, and fuel salt circulates in the core graphite pipe in liquid form. Currently available nuclear graphites are all porous materials. Once the fission product xenon with a large neutron absorption cross-section diffuses into the nuclear graphite, it will seriously affect the stable operation of the reactor. Therefore, preventing xenon gas from diffusing into nuclear graphite at the technical le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/26
CPCC23C16/26
Inventor 林前锋
Owner 林荣铨
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