The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Dry magnetic assisted impaction mixing of sub-micron boron and barium chromate for a time delay composition
Author:	Barrow, Ryan
View Online:	njit-etd2006-050 (xiii, 59 pages ~ 12.9 MB pdf)
Department:	Department of Mechanical Engineering
Degree:	Master of Science
Program:	Mechanical Engineering
Document Type:	Thesis
Advisory Committee:	Dave, Rajesh N. (Committee chair) Dreyzin, Edward L. (Committee member) Schoenitz, Mirko (Committee member)
Date:	2006-05
Keywords:	Born and barium chromate Dry mixing Magnetic Assisted Impaction Mixing
Availability:	Unrestricted
Abstract:	The objective of this investigation is to improve the mixture homogeneity of, Boron and Barium Chromate, a delay composition called T-10, using a novel dry mixing technique, , called the Magnetic Assisted Impaction Mixing (MAIM). Two additional mixing methods, ultra-sonic mixing and shaker mixing (dry and wet), were used for comparative analysis, to evaluate the mixing effectiveness of the MAIM which was also compared to two Navy mixed T-l0 samples. Characterization of the homogeneity is described by how well boron is effectively distributed throughout the mixture, which is a challenging task since the mixture's composition is 3% Boron versus 97% of Barium Chromate by weight, because boron has a low energy signature in energy dispersive x-ray (EDX) analysis. Qualitative mixing characterization was done using Field Emission-Scanning Electron Microscope (FESEM) with an ESB detector which provides higher Z contrast at extremely low accelerating voltage, resulting in higher spatial resolution and other systems such as Particle Size Analyzer (LS-230). The results indicate that the new MAIM techniques produces a mixture with a significantly improved homogeneity and a narrow particle size distribution due to its ability to break down large powder aggregates at a fraction of the time compared to the current Navy wet mixing processes, eliminates downstream processing associated with drying, and shows improved performance in majority of combustion propagation bum tests.