Microstructure and Mixing Distribution Analysis in M30 Triple-Base Propellants
Abstract
Two different lots of M30 triple-base propellants, RAD-MEI-049 and RAD-MEI-051 (lots 49 and 51), were analyzed to determine the degree of mixing and distribution of the components in the propellant grains using novel x-ray diffraction techniques developed at Stevens. The degree of mixing was relatively low in both lots; with lot 49 being better than lot 51. The mixing index of nitroglycerine (NG) was inferior in both lots when compared to nitrocellulose (NC) and nitroguanidine (NQ). The mixing distribution analysis of the components in the propellant grains showed enrichment of NQ and NC, and depletion of NG at the center. The reverse was true at the surface of the grains. Depletion of NQ in the grain interior and migration to the grain surface was evident in both lots. It was conclued that some of the NG is unbound and acts as a lower viscosity fluid during extrusion and migrates to the surface. Other processing defects observed in the M30 grains were formation of voids and internal cracks, and presence of wavy perforations. The alignment of the NQ particles along the extrusion axis of the grains was high in both of the lots; however, it suffered at the near-surface regions. The average particle diameter of NQ whiskers was larger in lot 49 than in lot 51. Future work is recommended for comprehensive and systematic evaluation of the mixing distribution and microstructure of the M30 triple-base propellants as affected by controlled processing parameters. Such systematic work in collaboration with ARDEC should offer significant cost saving insights for the process and production, and opportunities for improved quality of M30 triple-base propellants.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1998
- Accession Number
- ADA366139
Entities
People
- David Fair
- Dilhan M. Kalyon
- Rahmi Yazici
Organizations
- Stevens Institute of Technology