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Measurement of porosity in a composite high explosive as a function of pressing conditions by ultra-small-angle neutron scattering with contrast variation

Journal Article · · Propellants, Explosives, Pyrotechnics
 [1];  [1];  [1]
  1. Los Alamos National Laboratory
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We have used ultra-small-angle neutron scattering (USANS) with contrast variation to measure the porosity (voids and binder-filled regions) in a composite high explosive, PBX 9501, formulated with a deuterated binder. Little is known about the microstructure of pressed PBX 9501 parts and thus how it is affected by processing. Here, we explore the effect of varying the pressing intensity on the PBX 9501 microstructure. Disk-shaped samples of PBX 9501 were die-pressed with applied pressures ranging between 10,000 and 29,000 psi at 90 C. Five samples were prepared at each pressure that differed in the fraction of deuterated binder, facilitating variation of the neutron scattering length density contrast ({Delta}{rho}) and thus, the resolution of microstructural details. The sample composition was determined by calculation of the Porod Invariant as a function of {Delta}{rho} and compared with compositional estimates obtained from the bulk sample density. Structural modeling of the USANS data, at different levels of contrast, assuming both spherical and cylindrical morphologies, allowed the mean size and size distribution of voids and binder-filled regions to be determined. A decrease in the mean diameter of binder-filled regions was found with increasing pressing intensity, while the mean void diameter showed no significant change.

Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
DOE
DOE Contract Number:
AC52-06NA25396
OSTI ID:
956427
Report Number(s):
LA-UR-09-00931; LA-UR-09-931
Journal Information:
Propellants, Explosives, Pyrotechnics, Journal Name: Propellants, Explosives, Pyrotechnics; ISSN 0721-3115; ISSN PEPYD5
Country of Publication:
United States
Language:
English

References (14)

Small-angle scattering from porous amorphous substances journal October 1991
An Algorithm for Least-Squares Estimation of Nonlinear Parameters journal June 1963
Shock Initiation of Solid Explosives journal January 1961
Small-angle X-ray study of particulate reinforced composites journal December 1982
Reduction and analysis of SANS and USANS data using IGOR Pro journal November 2006
Changes in Pore Size Distribution upon Thermal Cycling of TATB-based Explosives Measured by Ultra-Small Angle X-Ray Scattering journal December 2006
Application of small-angle neutron scattering to the study of porosity in energetic materials journal May 2000
Design and performance of a thermal-neutron double-crystal diffractometer for USANS at NIST journal November 2005
Microstructural Analysis of Activated Carbons Prepared from Paper Mill Sludge by SANS and BET journal November 2001
The microstructure and morphology of carbon black: A study using small angle neutron scattering and contrast variation journal December 1994
The Effect of Pressing Parameters on the Mechanical Properties of Plastic Bonded Explosives journal December 2005
Quantitative analysis of damage in an octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazonic-based composite explosive subjected to a linear thermal gradient journal May 2005
Critical Conditions for Impact- and Shock-Induced Hot Spots in Solid Explosives † journal January 1996
Characterization of HMX particles in PBX 9501
  • Skidmore, C. B.; Phillips, D. S.; Son, S. F.
  • The tenth American Physical Society topical conference on shock compression of condensed matter, AIP Conference Proceedings https://doi.org/10.1063/1.55666
conference January 1998

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Related Subjects

36 MATERIALS SCIENCE
CHEMICAL EXPLOSIVES
DISTRIBUTION
MICROSTRUCTURE
NEUTRONS
POROSITY
PRESSING
PROCESSING
RESOLUTION
SCATTERING
SCATTERING LENGTHS