Crystal Lattice Doping Studies of High Energy Propellant Ingredients
Abstract
The kinetics of the thermal decomposition of both pure and Mg doped AlH3 have been determined, by using both isothermal constant volume and simultaneous DTA-TGA techniques. Of most importance in these derived parameters is the fact that the activation energy for the thermal decomposition of the Mg doped AlH3 is different from that for the pure AlH3. To help resolve these discrepancies the electrical conductance of these same samples has also been measured as a function of temperature and time. From these two studies a model for the thermal decomposition of AlH3 has been developed. Also reasons for the effectiveness of Mg in increasing the thermal stability of AlH3 are presented. The thermal behavior of HAP has been investigated by simultaneous DTA-TGA, thermal microscopy and mass spectrometry between room temperature and 100 C. These techniques clearly establish that HAP undergoes a crystal phase change at 65 C which is slowly reversible on cooling. At this same temperature H2O is evolved, presumably due to the crystal relaxation during the phase change. A unique feature of these samples is that they contain spherical 'pockets' of some material having a higher refractive index than the host molten HAP. At the moment the identity of this material is uncertain.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1969
- Accession Number
- AD0507040
Entities
People
- J. N. Maycock
- Maclyn Mccarty Jr.
- Vencatesk R. Paiverneker
Organizations
- Martin Marietta