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Method for determining specific surface area of micro-nano explosive crystalline powder

A technology of crystal powder and specific surface area, applied in the application field of nuclear technology, can solve the problems of affecting the work process, the measurement accuracy of nano-scale holes is not high, and it is difficult to handle, and achieves the effect of a simple preparation process.

Active Publication Date: 2019-04-23
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the opening defects in the micro-nano explosive crystal powder will significantly affect the sensitivity and mechanical properties of the explosive crystal itself, and on the other hand, it will affect the work process by affecting the deflagration characteristics of the explosive.
Mercury porosimetry requires a large amount of sample. This method is more suitable for the determination of macroporous materials. Since many pores are deformed or collapsed under high pressure, the measurement accuracy for nanoscale pores is not high. After the test is completed, the sample It cannot be used any longer, and the mercury after use is a toxic heavy metal that is not easy to handle, which is likely to cause environmental pollution
[0004] In summary, the existing conventional methods for measuring the specific surface area of ​​micro-nano explosive crystal powders still cannot fully meet the requirements of non-destructive, rapid, safe, and green environmental protection in practice, and new testing methods need to be developed

Method used

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  • Method for determining specific surface area of micro-nano explosive crystalline powder
  • Method for determining specific surface area of micro-nano explosive crystalline powder
  • Method for determining specific surface area of micro-nano explosive crystalline powder

Examples

Experimental program
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Embodiment 1

[0027] The micro-nano explosive crystal powder to be tested in this embodiment is the first TATB explosive crystal powder, named μTATB-1, the special sample container for small angle scattering is a quartz cuvette with an optical path of 1mm, and the small angle scattering test instrument is Mianyang Research Institute of China Suanni neutron small-angle scattering spectrometer stacked, the specific steps are as follows:

[0028] a. Weigh the micro-nano explosive crystal powder to be tested and record the weight;

[0029] b. Place the weighed micro-nano explosive crystal powder to be tested in a special sample container for small-angle scattering with an optical path of 1mm, and shake it gently until it is evenly filled, record the filling height, and obtain the micro-nano explosive crystal sample to be tested;

[0030] c. Small-angle scattering test is carried out on the micro-nano explosive crystal sample to be tested, and the small-angle scattering experimental data of the ...

Embodiment 2

[0040] The implementation of this embodiment is basically the same as that of Embodiment 1, and the main differences are shown in Table 1. The absolute value of the specific surface area of ​​the micro-nano explosive crystal powder to be tested obtained in this embodiment is shown in Table 1.

Embodiment 3

[0042] The implementation of this embodiment is basically the same as that of Embodiment 1, and the main differences are shown in Table 1. The absolute intensity scattering curve obtained in this embodiment, such as figure 2 As shown, it can be seen that the scattering intensity curve of the nTATB-1 sample is at a scattering vector of 0.06nm -1 ~1nm -1 The intervals all satisfy Porod's theorem, indicating that the explosive crystal surface is a smooth interface, and there is no surface fractal feature. The absolute value of the specific surface area of ​​the micro-nano explosive crystal powder to be tested obtained in this embodiment is shown in Table 1.

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Abstract

The invention discloses a method for determining the specific surface area of micro-nano explosive crystalline powder. The method comprises the following steps: firstly filling to-be-detected micro-nano explosive crystalline powder into a quartz sample box, then doing small angle scattering test, and processing small angle scattering test data, thus obtaining an absolute intensity scattering curve; then carrying out Porod fitting and calculating, thus obtaining the specific surface area of the micro-nano explosive crystalline powder. The method for determining the specific surface area of themicro-nano explosive crystalline powder, disclosed by the invention, is fast and nondestructive, and has the advantages of being fast, fast, green and environment-friendly. The determined specific surface area of the micro-nano explosive crystalline powder is an important parameter for representing micro morphologic characteristics of the micro-nano explosive crystalline powder, and can be used for further and deeply exploring the influence of morphologic characteristics of explosive crystal powder on macroscopic sensitivity, mechanical property, detonation characteristics and the like of theexplosive crystal powder.

Description

technical field [0001] The invention belongs to the application field of nuclear technology, and in particular relates to a method for measuring the specific surface area of ​​micro-nano explosive crystal powder. Background technique [0002] Explosive crystal powder is the main source of energy in the explosion process of energetic materials (propellants, pyrotechnic agents, mixed explosives and polymer bonded explosives, etc.), and is widely used in various fields of military and national economy. In particular, micro-nano explosive crystal powder, as a new type of functional material, has significant advantages in application: (1) selectable sensitivity; (2) faster energy release rate; (3) smaller critical diameter; (4) faster combustion Faster and fuller. Micro-nano explosive crystal powder is generally grown by solution recrystallization or mechanical ball milling. Micro-nano explosive crystal powder is a particle with a particle size of tens of nanometers to hundreds ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N23/201G01N23/202
CPCG01N15/088G01N23/201G01N23/202G01N2015/0846G01N2223/054G01N2223/1016G01N2223/106G01N2223/62
Inventor 白亮飞宋攀奇屠小青孙光爱龚建邱丽莉闫冠云田强曾贵玉彭梅
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF