Thermal Decomposition Characteristics of Orthorhombic Ammonium Perchlorate (o-AP)

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Preliminary STMBMS and SEM results of the thermal decomposition of AP in the orthorhombic phase are presented. The overall decomposition is shown to be complex and controlled by both physical and chemical processes. The data show that the physical and chemical processes can be probed and characterized utilizing SEM and STMBMS. The overall decomposition is characterized by three distinguishing features: an induction period, and accelerator period and a deceleratory period. The major decomposition event occurs in the subsurface of the AP particles and propagates towards the center of the particle with time. The amount of total decomposition is dependent upon ... continued below

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17 pages

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Behrens, R. & Minier, L. March 1, 1999.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Preliminary STMBMS and SEM results of the thermal decomposition of AP in the orthorhombic phase are presented. The overall decomposition is shown to be complex and controlled by both physical and chemical processes. The data show that the physical and chemical processes can be probed and characterized utilizing SEM and STMBMS. The overall decomposition is characterized by three distinguishing features: an induction period, and accelerator period and a deceleratory period. The major decomposition event occurs in the subsurface of the AP particles and propagates towards the center of the particle with time. The amount of total decomposition is dependent upon particle size and increases from 23% for {approximately}50{micro}m-diameter AP to 33% for {approximately}200{micro}m-diameter AP. A conceptual model of the physical processes is presented. Insight into the chemical processes is provided by the gas formation rates that are measured for the gaseous products. To our knowledge, this is the first presentation of data showing that the chemical and physical decomposition processes can be identified from one another, probed and characterized at the level that is required to better understand the thermal decomposition behavior of AP. Future work is planned with the goal of obtaining data that can be used to develop a mathematical description for the thermal decomposition of o-AP.

Physical Description

17 pages

Notes

OSTI as DE00004230

Source

  • 35th JANNAF Combustion Subcommittee Meeting, Tucson, AZ (US), 12/03/1998--12/07/1998

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  • Report No.: SAND99-0496C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 4230
  • Archival Resource Key: ark:/67531/metadc685350

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  • March 1, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 12, 2016, 3:05 p.m.

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Behrens, R. & Minier, L. Thermal Decomposition Characteristics of Orthorhombic Ammonium Perchlorate (o-AP), article, March 1, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc685350/: accessed August 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.