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Method for synthesizing porous structure based on energetic compound in-situ enhanced Ta/Si combustion

A technology of combustion synthesis and porous structure, applied in the direction of carbon compounds, chemical instruments and methods, metal silicides, etc., can solve the problems of low energy utilization rate, high production cost, complex process, etc., and achieve low energy utilization rate and energy supply The effect of long time and simple process

Active Publication Date: 2021-06-01
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the disadvantages of high production cost, complex process, long time-consuming and low energy utilization rate that need to use special equipment for long-term heat treatment to realize stable self-sustained combustion of Ta / Si system, and provide A method for synthesizing porous structures based on in situ enhanced Ta / Si combustion of energetic composites

Method used

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  • Method for synthesizing porous structure based on energetic compound in-situ enhanced Ta/Si combustion
  • Method for synthesizing porous structure based on energetic compound in-situ enhanced Ta/Si combustion
  • Method for synthesizing porous structure based on energetic compound in-situ enhanced Ta/Si combustion

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Experimental program
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Effect test

Embodiment 1

[0058] Spherical Si powder with an average particle diameter of 100 nm and spherical Ta powder with an average particle diameter of 2 μm were weighed according to the masses shown in Table 1, respectively. The spherical Si powder was coated on the surface of the spherical Ta powder by electrostatic self-assembly method to obtain Ta@Si powder. Weigh polyvinylidene fluoride and hexanitrohexaazaisowurtzitane according to the mass shown in Table 1, add them to a beaker containing 50ml of a mixed solution of dimethylformamide and acetone, and ultrasonically dissolve the energetic complex , and adding Ta@Si powder to prepare a spray granulation slurry, and magnetic stirring at room temperature for 1-10 hours. Ta@Si@ECs microspheres with core-shell structure were prepared by spray drying device. The Ta@Si@ECs microspheres were loaded into a mold and pressed into a columnar billet with a cold pressing pressure of 2 MPa. Put the pressed billet into the combustion chamber, fill it wit...

Embodiment 2

[0061] Weighing according to Table 1, other with embodiment 1;

[0062] As can be seen from Table 2, the combustion velocity of embodiment 2 is close to embodiment 1; figure 2 Can find out that the highest combustion wave temperature of embodiment 2 is 1152 ℃; From image 3 It can be seen that the porosity of its combustion synthesis product obviously improves compared with Example 1, and the content of TaC increases compared with Example 1 ( Figure 4 ).

Embodiment 3

[0064] Weighing according to Table 1, other with embodiment 1;

[0065] From figure 1 It can be seen that there are four components of polyvinylidene fluoride, hexanitrohexaazaisowurtzitane, μ-Ta, and n-Si in Example 3; as can be seen from Table 2, the burning speed of Example 3 is 5.1mm / s; from figure 2 It can be seen that the highest combustion wave temperature of embodiment 3 is 1392 ℃, compared with embodiments 1 and 2, the combustion speed has improved by 1.6 times; from image 3 It can be seen that the combustion synthesis product has a large number of pores, and its porosity is greatly improved. At the same time, new tantalum nitrides and oxides appear in the product. For details, see Figure 4 .

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Abstract

The invention provides a method for synthesizing a porous structure by in-situ enhancement of Ta / Si combustion based on an energetic compound, and solves the defects of high production cost, complex process, long time consumption and low energy utilization rate due to the fact that special equipment needs to be used for carrying out long-time heat treatment to realize stable self-sustaining combustion of a Ta / Si system in the prior art. The method comprises the following steps: 1) preparing Ta@ Si powder with a core-shell structure by adopting an electrostatic self-assembly method; (2) preparing an energetic compound coated Ta@Si microsphere by utilizing the energetic compound; and 3) carrying out cold press molding on the obtained energetic compound coated Ta@Si microspheres, and carrying out self-propagating combustion synthesis to obtain the composite material with a porous structure.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a method for synthesizing a porous structure based on the in-situ enhanced Ta / Si combustion of an energetic compound. Background technique [0002] Combustion synthesis, also known as self-propagating high-temperature synthesis, uses the heat generated by the exothermic reaction of the precursor material itself to promote the continuous combustion reaction; this technology has been successfully applied to the preparation of a large number of powders, ceramics and intermetallic compounds, etc.; Functional materials with complex structures have broad application prospects (Levashov, E.A., et al., Self-propagating high-temperature synthesis of advanced materials and coatings. International Materials Reviews, 2016.62(4): p.203-239.). [0003] However, for most combustion synthesis systems, stable self-sustained combustion is not easy to achieve; they usually re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/914C01B33/06
CPCC01B32/914C01B33/06C01P2004/80C01P2004/03C01P2002/85C01P2002/72
Inventor 严启龙杨素兰王帅中
Owner NORTHWESTERN POLYTECHNICAL UNIV
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