Accession Number : AD0502616

Title :   Surveillance Studies of LMH-1.

Descriptive Note : Annual technical summary rept. 1 Jan-31 Dec 68,

Corporate Author : DOW CHEMICAL CO MIDLAND MICH CHEMICALS LAB

Personal Author(s) : Wilson,E. J. ; Roberson,K.

Report Date : JAN 1969

Pagination or Media Count : 79

Abstract : Surveillance has continued on various samples of aluminum hydride. The types of aluminum hydride which are being studied include: magnesium doped, magnesium-doped, DPA (diphenylacetylene) treated, n-butylamine, and pH 7 hydrolyzed material. These samples are providing valuable decomposition rate data both neat at -15, 25, and 40 C., and in propellant at 25, 40, and 60 C. Results of the neat aluminum hydride surveillance program continue to show very low decomposition rates at 25 C. One sample of magnesium-doped aluminum hydride has decomposed only 0.055% after two years. Many samples which demonstrated much better 60 C. stability are now being studied. The neat aluminum hydride decomposition data have been correlated using the Avrami-Erofeev equation and commonly used kinetic relationships. An average activation energy of 23 kcal/mole has been determined. High stability magnesium-doped samples have shown even higher activation energies. The equations used for correlating the decomposition data can also be used for predicting the 25 C. stability from the decomposition data at a higher temperature. The weakest part of this correlation is in the assumption of a particular activation energy. However, a n-butylamine treated sample now being studied in the neat surveillance program is expected to require 1 to 3 years to decompose 0.03% based on two possible activation energy values.

Descriptors :   (*METALS, HYDRIDES), REACTION KINETICS, THERMAL STABILITY, SPECIFIC IMPULSE, STORAGE (U) *ALUMINUM COMPOUNDS, *DECOMPOSITION, MAGNESIUM, DOPING, PH FACTOR, HYDROLYSIS, AMINES, SOLID ROCKET PROPELLANTS, GAS GENERATING SYSTEMS, DOUBLE BASE ROCKET PROPELLANTS, SOLID ROCKET OXIDIZERS, SOLID ROCKET PROPELLANT BINDERS, FUEL ADDITIVES, SOLID ROCKET FUELS

Subject Categories : Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE