An in-situ synthesized carbon nanotube/hafnium boride nanocomposite material and its preparation method

A technology of carbon nanotubes and composite materials, applied in the field of materials, can solve the problems of difficult dispersion, inability to completely eliminate, and easy agglomeration of carbon nanotubes.

Active Publication Date: 2020-12-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the nanoscale of carbon nanotubes, a large number of carbon nanotubes are easy to agglomerate and difficult to disperse to form uniform preparation components.
Even if the spark plasma sintering method is used for sintering, it can only make up for some of the above-mentioned defects, but cannot completely eliminate the above-mentioned defects.

Method used

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  • An in-situ synthesized carbon nanotube/hafnium boride nanocomposite material and its preparation method
  • An in-situ synthesized carbon nanotube/hafnium boride nanocomposite material and its preparation method
  • An in-situ synthesized carbon nanotube/hafnium boride nanocomposite material and its preparation method

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preparation example Construction

[0038] The invention provides a preparation method for in-situ synthesis of carbon nanotube / hafnium boride nanocomposite ceramic material, the preparation method comprising the following steps:

[0039] (1) Mix the nano-hafnium boride powder with the metal ion solution, adjust the pH of the mixed solution until the metal ions are completely precipitated, and then wash, dry, grind and calcinate the precipitate in sequence to obtain a metal oxide / hafnium boride composite material .

[0040] The particle size of the hafnium boride powder also has an influence on the mechanical properties of the carbon nanotube / hafnium boride nanocomposite powder. If the particle size of hafnium boride powder is too large, it may not be able to adsorb to the surface of the precipitate formed by metal ions, and if the particle size is too small, a large amount of agglomeration will occur, which will lead to uneven distribution of metal on the surface of hafnium boride, which will affect the carbon ...

Embodiment 1

[0056] Such as figure 1 As shown, the preparation method of the present embodiment comprises the following steps:

[0057] S1, adding nano-hafnium boride powder containing Ni 2+ In the deionized aqueous solution (prepared by dissolving nickel nitrate in deionized water), use a magnetic stirrer to continuously stir, and at the same time add NaOH aqueous solution to Ni 2+ Completely settled. After the above solution was left to stand for 24 hours, it was filtered and washed until the pH value was 7, and the solid precipitate was placed in an 80°C drying oven for drying treatment, and then ground to obtain Ni(OH) 2 Powder, Ni(OH) 2 The powder is placed in an atmosphere protection furnace, under N 2 Calcining at 600° C. for 2 hours under protection to obtain a NiO / hafnium boride composite material.

[0058] Put the NiO / HfB composite material into the constant temperature zone of the tube furnace and 2 Warm up to the reduction temperature of 600°C under protection, and then t...

Embodiment 2

[0064] Embodiment 2, Embodiment 3, and Embodiment 4 are carried out in the same manner as Embodiment 1, and the differences are shown in Table 3.

[0065] The preparation process conditions of each embodiment of table 3

[0066]

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Abstract

The invention relates to a carbon nanotube / hafnium boride nano composite ceramic material and a preparation method thereof. The preparation method comprises the following steps: (1) mixing nano hafnium boride powder and metal ion solution, adjusting pH of the mixed solution until the metal ions are completely precipitated, successively washing, drying, grinding and calcining the precipitates, andobtaining a metal oxide / hafnium boride composite material; (2) reducing the metal oxide / hafnium boride nano composite material to a metal / halfnium boride composite material; (3) adopting the metal / hafnium boride composite material as a catalyst, introducing a carbon source gas and a protection gas, in-situ growing carbon nanotubes on the surface of hafnium boride by virtue of a chemical vapor deposition method, and obtaining the carbon nanotube / hafnium boride composite powder; and (4) performing the discharging plasma sintering for the carbon nanotube / hafnium boride composite powder, and obtaining the carbon naontube / hafnium boride nano composite ceramic material. By adopting the preparation method of the invention, not only can the breaking toughness of the material be improved, but alsothe hardness and bending strength of the material can be improved.

Description

technical field [0001] The invention relates to the field of material technology, in particular to an in-situ preparation method of carbon nanotube / hafnium boride nanocomposite powder and a carbon nanotube / hafnium boride nanocomposite material prepared therefrom. Background technique [0002] Hafnium boride has a high density (10.5g / cm 3 ), high melting point (3250°C), small coefficient of thermal expansion (5.7×10 -6 / K), making it an excellent ultra-high temperature ceramic material, which has excellent application prospects in the aerospace field. However, single-phase hafnium boride ceramic materials are difficult to sinter and are not easy to densify, which affects the mechanical properties such as shock resistance, hardness and flexural strength of the material, and the fracture toughness of single-phase materials under high temperature conditions is poor. , so that its application is greatly limited. [0003] Carbon nanotubes are a new type of carbon material, main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/58C04B35/628
CPCC04B35/806C04B35/58078C04B35/62828C04B2235/5248C04B2235/666C04B2235/96
Inventor 金华梁伟孟松鹤许承海解维华
Owner HARBIN INST OF TECH
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