Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for measuring specific surface area of explosive crystals

A specific surface area and crystal technology, which is applied in the field of determining the specific surface area of ​​explosive crystals, can solve the problem that the internal closed pores and surface open pores of explosive crystals cannot be quantified at the same time, and achieve the effect of simple preparation process

Active Publication Date: 2018-09-14
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantage that the existing closed pores and surface openings of explosive crystals cannot be quantified at the same time, the present invention provides a method capable of measuring the specific surface area of ​​explosive crystals, especially relates to a method for measuring the specific surface area of ​​open pores and closed pores of explosive crystals method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for measuring specific surface area of explosive crystals
  • Method for measuring specific surface area of explosive crystals
  • Method for measuring specific surface area of explosive crystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 measures the specific surface area of ​​HMX explosive crystal powder

[0029] In order to measure the specific surface area of ​​closed cells inside the HMX explosive crystal and open pores on the outer surface, cyclohexane (neutron scattering length density of neutron scattering length density is -0.279×10 10 cm -2 ) and deuterated cyclohexane (with a neutron scattering length density of 6.68×10 10 cm -2 ) as a solution for contrast soaking; deuterated cyclohexane and non-deuterated cyclohexane are prepared into three series of mixed solutions for contrast transformation according to the volume ratio of 10:90, 70:30 and 0:100; then The mixed solution and five kinds of HMX explosive crystal powders to be tested are placed together in a special-purpose quartz cuvette for neutron small-angle scattering with a neutron optical path of 1 mm and left to stand for 24 hours to obtain a series of contrast-transformed explosive crystal suspensions; then use The ne...

Embodiment 2

[0032] Embodiment 2 Determination of the specific surface area of ​​TATB explosive crystals in a certain TATB-based PBX sample

[0033] In order to measure the specific surface area of ​​the internal closed cells and the open pores of the outer surface of the TATB explosive crystal in a TATB-based PBX explosive, firstly select ethyl acetate to dissolve the binder in the PBX, and then filter and dry to obtain the TATB explosive crystal powder; Water insoluble in TATB explosive crystals (neutron scattering length density is -0.560×10 10 cm -2 ) and heavy water (neutron scattering length density is 6.33×10 10 cm -2 ) as a solution for contrast soaking; water and heavy water are prepared into three series of mixed solutions for contrast transformation in a volume ratio of 50:50, 21:79, and 0:100; then the mixed solution and the TATB explosive to be tested The crystal powder is placed together in a special quartz cuvette for neutron small-angle scattering with a neutron optical ...

Embodiment 3

[0034]Embodiment 3 Measure the specific surface area of ​​a certain LLM-105 explosive crystal

[0035] Methanol that is insoluble in LLM-105 explosive crystals is selected (the neutron scattering length density is -0.373×10 10 cm -2 ) and deuterated methanol (with a neutron scattering length density of 5.80×10 10 cm -2 ) as a solution for contrast soaking; methanol and deuterated methanol are prepared into three series of mixed solutions for contrast transformation in a volume ratio of 100:0, 10:90, and 0:100; then the mixed solution and LLM- 105 explosive crystal powders were placed together in a special quartz cuvette for ultra-small-angle neutron scattering with a neutron optical path length of 20 mm and left to stand for 24 hours to obtain a series of contrast-transformed explosive crystal suspensions; small-angle neutron scattering test, and obtain experimental data; then carry out buckle and absolute intensity correction to the ultra-small-angle neutron scattering exp...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for measuring the specific surface area of explosive crystals. The method comprises the following steps: preparing a mixed solution with series contrast transformationfrom a specific deuteration reagent and a non-deuteration reagent corresponding to the specific deuteration reagent; then preparing an explosive crystal suspension liquid with series contrast transformation from the mixed solution and to-be-measured explosive crystals; carrying out neutron small-angle scattering test and processing neutron small-angle scattering experimental data to obtain an absolute strength scattering curve; and solving a system of linear equations and carrying out Porod fitting to obtain the number of closed pores in the explosive crystals and the specific surface area ofthe outsides. The method is an effective method for simultaneously measuring the closed pores of the insides of the explosive crystals and the specific surface area of the outsides, and the obtainednumerical values are basis for deeply research of influence association of defects in the explosive crystals to macro sensitivity, mechanical property and deflagration behavior, and can also serve asreference for identification of quality of the explosive crystals.

Description

technical field [0001] The invention relates to a method for measuring the specific surface area of ​​explosive crystals, in particular to a method for measuring the specific surface areas of internal closed cells and surface openings of explosive crystals. Background technique [0002] Explosive crystals are the main source of energy in the explosion work process of energetic materials (propellants, pyrotechnic agents, mixed explosives and polymer bonded explosives, etc.), and are widely used in various fields of military and national economy. Since explosive crystals are generally particles of tens of nanometers to hundreds of microns in size grown through solution recrystallization, it is inevitable that the inside of the formed explosive crystal particles will have many internal closed pores and surface pores due to solvent wrapping. Defects (also known as initial defects in explosive crystals), in which the size of internal closed cells ranges from a few nanometers to h...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N15/08
CPCG01N15/088
Inventor 白亮飞田强孙光爱闫冠云宋攀奇刘渝龚建屠小青黄朝强彭梅陈良
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com