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Controlling the microstructure of vapor-deposited pentaerythritol tetranitrate films

Published online by Cambridge University Press:  29 June 2011

Robert Knepper ,
Alexander S. Tappan ,
Ryan R. Wixom  and
Mark A. Rodriguez
Robert Knepper*
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
Alexander S. Tappan
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
Ryan R. Wixom
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
Mark A. Rodriguez
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
*
a)Address all correspondence to this author. e-mail: rkneppe@sandia.gov
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Abstract

We have demonstrated that the microstructure of thick pentaerythritol tetranitrate (PETN) films can be controlled using physical vapor deposition by varying the film/substrate interface. PETN films were deposited on silicon and fused silica with and without a thin layer of sputtered aluminum to demonstrate the effects of the interface on subsequent film growth. Evolution of surface morphology, average density, and surface roughness as a function of film thickness were characterized using surface profilometry, scanning electron microscopy, and atomic force microscopy. Significant variations in density, pore size, and surface morphology were observed in films deposited on the different substrates. In addition, x-ray diffraction experiments showed that while films deposited on bare fused silica or silicon had only weak texturing, films deposited on a sputtered aluminum layer were highly oriented, with a strong (110) out-of-plane texture.

Keywords

MicrostructureEnergetic materialPhysical vapor deposition

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Type
Articles
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Journal of Materials Research , Volume 26 , Issue 13 , 14 July 2011 , pp. 1605 - 1613
Copyright
Copyright © Materials Research Society 2011

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