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Method for preparing boron-doped isotropic pyrolytic carbon material

An isotropic, pyrolytic carbon technology, applied in the field of pyrolytic carbon materials, can solve problems such as differences in structure and performance, and achieve the effect of dense and uniform structure and excellent oxidation resistance

Active Publication Date: 2011-07-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to improve the oxidation resistance of isotropic pyrolytic carbon materials, the object of the present invention is to provide a method for preparing boron-doped isotropic pyrolytic carbon materials to solve the problem of this amorphous boron-carbon alloy existing in the prior art There are significant differences in structure and performance from isotropic pyrolytic carbon materials, etc.

Method used

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  • Method for preparing boron-doped isotropic pyrolytic carbon material
  • Method for preparing boron-doped isotropic pyrolytic carbon material
  • Method for preparing boron-doped isotropic pyrolytic carbon material

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Embodiment 1

[0027] The deposition temperature is 1200° C., the flow rate of propane gas is 100 mL / min, the flow rate of boron trichloride gas is 60 mL / min, and the flow rate of hydrogen gas is 500 mL / min. The deposition substrate is a graphite cylinder with a diameter of 15 mm and a length of 40 mm, with a polished surface. In this embodiment, the reaction time is 1 hour, and a boron-doped isotropic pyrolytic carbon material is obtained, the coating thickness is about 1 mm, and the boron doping amount is 2.1 at.%.

[0028] Such as figure 2 As shown, observed under a metallographic microscope, the prepared pyrolytic carbon has a dense structure, and some micropores are evenly distributed in the material; the material has no growth characteristics, has no optical activity, and is an isotropic material.

[0029] Such as image 3 The X-ray diffraction spectrum of the material shows that the material is a two-phase mixture of pyrolytic carbon and boron carbide. Among them, pyrolytic carbon...

Embodiment 2

[0033] The deposition temperature is 1200° C., the flow rate of propane gas is 100 mL / min, the flow rate of boron trichloride gas is 150 mL / min, and the flow rate of hydrogen gas is 500 mL / min. The deposition substrate is a graphite cylinder with a diameter of 15 mm and a length of 40 mm, with a polished surface. In this embodiment, the reaction time is 1.5 hours, and boron-doped isotropic pyrolytic carbon material is obtained, the coating thickness is about 1.5 mm, and the material is composed of lamellar and granular carbon structures. The diameter of the granular carbon structure is 0.5 micron to 2 micron, they are closely connected by lamellar carbon structure, the boron doping amount is 2.82wt%, and the boron element is mainly in the form of boron carbide, which is evenly distributed in the pyrolytic carbon matrix.

Embodiment 3

[0035] The deposition temperature is 1250° C., the flow rate of propane gas is 100 mL / min, the flow rate of boron trichloride gas is 60 mL / min, and the flow rate of hydrogen gas is 500 mL / min. The deposition substrate is a graphite cylinder with a diameter of 15 mm and a length of 40 mm, with a polished surface. In this embodiment, the reaction time is 2 hours, and boron-doped isotropic pyrolytic carbon material is obtained. The coating thickness is about 2 mm. The material is composed of lamellar and granular carbon structures. The diameter of the granular carbon structure is The thickness is 0.5 micron to 2 microns, and they are closely connected by lamellar carbon structures. The boron doping amount is 2.27 at.%, and the boron element is mainly in the form of boron carbide, which is evenly distributed in the pyrolytic carbon matrix.

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Abstract

The invention relates to the field of pyrolytic carbon materials, and in particular relates to a preparation method of a boron-doped isotropic pyrolytic carbon material with excellent oxidation resistance. The method comprises the following steps: after reaching a set deposition temperature, simultaneously introducing carbon source and boron-source gases in a high-temperature tubular depositing furnace so as to achieve boron-carbon co-deposition for 0.5-10 hours at the deposition temperature of 1100-1400 DEG C at normal pressure (slightly higher than 1 atm, and pressure range is 1.013*10<5> Pa-1.1*10<5> Pa) by utilizing a chemical gas phase co-deposition process based on graphite as a deposition substrate; and preparing the isotropic pyrolytic carbon material. By using the preparation method, the boron-doped pyrolytic carbon material which is in a uniform and compact structure and has good oxidation resistance is obtained; and observed by a metalloscope, the material has no growth characteristic and has non-optical activity, and is an isotropic material.

Description

technical field [0001] The invention relates to the field of pyrolytic carbon materials, in particular to a method for preparing a boron-doped isotropic pyrolytic carbon material with excellent oxidation resistance. Background technique [0002] Because carbonaceous materials have excellent properties such as good self-lubrication, low friction coefficient, good thermal conductivity, small thermal expansion, corrosion resistance, wear resistance, and high temperature resistance, they are widely used as structural or functional materials in machinery, electronics, atomic energy, and biomedicine. and many other fields. The document "Preparation and Characterization of Large-Size Isotropic Pyrolytic Carbon "New Carbon Materials" Volume 21, Issue 2, 2006, Pages 119-123", discloses a large-scale steady-state fluidized bed, chemical vapor deposition process Process for preparing isotropic pyrolytic carbon. The isotropic pyrolytic carbon prepared by this method is mainly composed...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 吴峻峰许力白朔成会明徐红军周序科罗川周金玉
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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