Preparation and application of silicon nitride coated carbon nano tube

A silicon nitride package, carbon nanotube technology, applied in nitrogen compounds, nanotechnology, nanotechnology and other directions, can solve the problems that have not yet met the requirements of industrial application, achieve controllable reaction rate, obvious toughening effect, and uniform solution dispersion effect

Active Publication Date: 2019-10-18
SUZHOU FIRST ELEMENT NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current carbon nanotube toughening technology has not yet met the requirements of industrial applications.

Method used

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  • Preparation and application of silicon nitride coated carbon nano tube
  • Preparation and application of silicon nitride coated carbon nano tube
  • Preparation and application of silicon nitride coated carbon nano tube

Examples

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preparation example Construction

[0023] The embodiment of the present invention relates to a method for preparing silicon nitride-coated carbon nanotubes, comprising the following steps:

[0024] S1, loosely pack carbon nanotubes into and fill the entire reactor, and then evacuate to 0.1-100Pa; then pass silicon tetrachloride gas into the reactor until the initial pressure in the reactor is in the range of 1-2atm; Inject ammonia gas to make silicon tetrachloride gas react with ammonia gas at -20-60°C, and keep the pressure in the reactor within the range of 0.5 atm less than the initial pressure to the initial pressure during the reaction process; silicon tetrachloride The nitrogen-containing silane compound generated by the reaction of gas and ammonia is deposited on the surface of carbon nanotubes;

[0025] S2, under an ammonia atmosphere, heating the carbon nanotubes with the nitrogen-containing silane compound attached to the surface in step S1 to 500-600° C., and heat-treating for 1-2 hours to remove the...

Embodiment 1

[0031] This embodiment relates to a method for preparing silicon nitride-coated carbon nanotubes, comprising the following steps:

[0032] S1, set the bulk density to 0.15g / cm 3 After loading and filling the whole reactor with carbon nanotubes, evacuate to 100Pa, feed silicon tetrachloride gas into the reactor from the first feeding port until the pressure reaches 1 atm; then continuously feed ammonia gas from the second feeding port , so that silicon tetrachloride gas and ammonia react at 25 ° C, and keep the pressure in the reactor within the range of 0.5 to 1 atm during the reaction; the nitrogen-containing silane compound generated by the reaction of silicon tetrachloride gas and ammonia is deposited on the On the surface of carbon nanotubes, when the pressure in the reactor continues to rise above 1 atm, stop passing ammonia and keep the pressure for 1 hour to ensure the complete reaction;

[0033] S2, heat the reactor to 550°C, keep it warm for 2 hours, and remove the b...

Embodiment 2

[0037] This embodiment relates to a method for preparing silicon nitride-coated carbon nanotubes, comprising the following steps:

[0038] S1, set the bulk density to 0.2g / cm 3 After loading and filling the whole reactor with carbon nanotubes, evacuate to 10Pa; feed silicon tetrachloride gas into the reactor from the first feeding port until the pressure reaches 1.5atm, and then continuously feed ammonia from the second feeding port Gas, so that silicon tetrachloride gas and ammonia react at -10 ° C, and keep the pressure in the reactor within the range of 1 to 1.5 atm during the reaction; nitrogen-containing silane formed by the reaction of silicon tetrachloride gas and ammonia The compound is deposited on the surface of the carbon nanotubes. When the pressure in the reactor continues to rise above 1.5 atm, the ammonia gas is stopped and the pressure is maintained for 1 hour to ensure the complete reaction;

[0039] S2, heat the reactor to 550°C, keep it warm for 2 hours, an...

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Abstract

The invention provides preparation and application of a silicon nitride coated carbon nano tube, and belongs to the technical field of functional materials. A preparation method of the silicon nitridecoated carbon nano tube comprises the following steps that S1, the carbon nano tube is loaded into a whole reaction kettle in a loosening mode and the whole reaction kettle is filled with the carbonnano tube, and then vacuumizing is carried out to 0.1-100Pa; then silicon tetrachloride gas is introduced into the reaction kettle to initial pressure in the reaction kettle being in a range of 1-2atm; then ammonia gas is introduced continuously and reacts with the silicon tetrachloride gas under -20-60 DEG C, and a nitrogenous silane compound generated by the silicon tetrachloride gas and the ammonia gas is deposited on the surface of the carbon nano tube; S2, at an ammonia gas atmosphere, the carbon nano tube attached with the nitrogenous silane compound on the surface in the S1 is heated to500-600 DEG C, and heat treatment is carried out for 1-2 hours; and S3, continuous heating is carried out to 650-1200 DEG C, heat treatment is carried out for 2-8 hours, so that the nitrogenous silane compound is decomposed into amorphous silicon nitride, and the amorphous silicon nitride is uniformly deposited on the surface of the carbon nano tube. According to the preparation and application of the silicon nitride coated carbon nano tube, industrial production requirement and application of the silicon nitride coated carbon nano tube can be realized.

Description

technical field [0001] The invention relates to a technology in the field of functional materials, in particular to the preparation and application of silicon nitride-coated carbon nanotubes. Background technique [0002] Silicon nitride ceramics are high-temperature structural ceramics, which have better mechanical properties, thermal properties and chemical stability than other high-temperature structural ceramics such as oxide ceramics and carbide ceramics, and are considered to be the most promising high-temperature structural ceramics. Material. Although silicon nitride ceramics have good performance, it also has the defects of high brittleness and low strength of ceramics, which limits its application. Therefore, improving the performance of silicon nitride ceramics to strengthen and toughen them is the key to expand their applications. [0003] Traditional toughening methods for silicon nitride ceramics, such as dispersion toughening, fiber whisker toughening and mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/168C01B21/068C04B35/584B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B21/068C01B32/168C01P2004/03C01P2004/80C04B35/584
Inventor 王金娥董明
Owner SUZHOU FIRST ELEMENT NANO TECH
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