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Method for preparing sustainable high-yield carbon microtubes

A carbon micro-tube, high-yield technology, which is applied in the field of sustainable high-yield carbon micro-tube preparation, can solve the problems of low output of carbon micro-tubes, etc., and achieves the effects of low cost, increased output, and low raw materials

Inactive Publication Date: 2013-11-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low output of carbon microtubes prepared by existing methods, and to provide a method for preparing sustainable high-yield carbon microtubes

Method used

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  • Method for preparing sustainable high-yield carbon microtubes
  • Method for preparing sustainable high-yield carbon microtubes
  • Method for preparing sustainable high-yield carbon microtubes

Examples

Experimental program
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specific Embodiment approach 1

[0020] Embodiment 1: The method for preparing sustainable high-yield carbon microtubes in this embodiment is carried out according to the following steps:

[0021] 1. Mix ethylene glycol and urea uniformly at a mass ratio of 0.5 to 10:100 to obtain a solid mixture. Put the solid mixture into a graphite crucible, and then place the graphite crucible containing the solid mixture in a pressure sintering furnace. After closing the furnace body of the air pressure sintering furnace, evacuate the air pressure sintering furnace until the pressure in the furnace is 0.1Pa~1Pa;

[0022] 2. Fill high-purity nitrogen or argon into the air pressure sintering furnace after vacuuming in step 1, so that the pressure in the air pressure sintering furnace reaches 0.2MPa~2.5MPa;

[0023] 3. Under the condition that the temperature rise rate of the gas pressure sintering furnace is 5°C / min-30°C / min, after the temperature of the gas pressure sintering furnace is raised to 900°C-1500°C, keep it war...

specific Embodiment approach 2

[0031] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, ethylene glycol and urea are mixed uniformly at a mass ratio of 0.5:100. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0032] Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: the pressure described in step 1 is 0.2Pa-0.9Pa. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing sustainable high-yield carbon microtubes, relating to a method for preparing sustainable high-yield carbon microtubes. The invention aims to solve the problem that the yield of carbon microtubes prepared by the existing methods is low. The method disclosed by the invention comprises the following steps of: 1, placing a graphite crucible filled with a mixture of ethylene glycol and urea into a gas pressure sintering furnace, and vacuumizing; 2, feeding high-purity nitrogen or argon gas into the gas pressure sintering furnace; 3, when the temperature of the gas pressure sintering furnace raises to 900-1500 DEG C, carrying out heat preservation for 30-120 min; and 4, feeding a gas mixture of methane and ammonia gas into the gas pressure sintering furnace, carrying out heat preservation, and cooling the gas pressure sintering furnace to room temperature, thereby obtaining a microtube. According to the invention, the continuous operation of a reaction for microtube preparation can be ensured through the continuous addition of raw materials, and the yield of the prepared microtubes is high. The method disclosed by the invention is applied to the preparation of carbon microtubes.

Description

technical field [0001] The invention relates to a method for preparing sustainable high-yield carbon microtubes. Background technique [0002] In modern warfare, the development of stealth technology is an important means to improve the survival and penetration of weapons and equipment and the overall combat effectiveness. Micron and nanometer carbon materials have become the carrier materials for wave absorbers with the most development potential in the new generation. As an electric loss absorber, carbon microtubes have many advantages that other materials cannot match, such as: small specific gravity, good chemical stability, unique mechanical, electrical, and magnetic properties, etc. In addition, due to its micron-scale tube diameter, it also overcomes the shortcomings of carbon nanotubes in micro-nano fluids, micro-nano reaction vessels, etc., and it is easier to achieve single operation. Different from carbon nanotubes formed by curling graphite sheets, carbon micro...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B32/05
Inventor 黄小萧温广武鲁明张晓东
Owner HARBIN INST OF TECH