Process for Assessing the Stability of HAN (Hydroxylammonium Nitrate)-Based Liquid Propellants
Abstract
Liquid propellants with hydroxylammonium nitrate (HAN) as a major component react to metallic and non-metallic impurities by undergoing decomposition. In this study, the effects of a number of metals (both as ions and as elements) and of a number of plastics on the chemical stability as well as the long-term stability and/or lifetime of the HAN-based monergol LP 1846 are examined. For this purpose, two test methods were developed and applied: long-term storage at 90 deg C (194 deg F) a) in 5cc sealed glass ampoules and b) in 3 cc glass containers equipped with miniature pressure-transducers. The times up to the bursting of the glass ampoules or up to when a specific pressure is reached constitute accurate parameters in assessing the stability of propellant. The effects of the 25 types of metal ions we studied are given. Iron, copper and vanadium ions caused the greatest decomposition. Other metal ions, such as those of magnesium, zinc and manganese, had no influence on the lifetime of the propellant. We also examined 30 different metals and alloys in this context. Base metals entered into solution in the propellant, destroying its utility as a result. Two gunmetals and 3 stainless steels were subject to pronounced attack, thus greatly shortening the lifetime of the propellants. Gold, silver and tantalum remained without effect on the propellant and may consequently be used in constructing the necessary equipment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 09, 1989
- Accession Number
- ADA212896
Entities
People
- E. Backof
- H. J. De Greiff
- Roy Edgar Hansen