Explosive and thermic compositions or charges – Processes of making
Patent
1974-05-17
1979-09-11
Lovering, Richard D.
Explosive and thermic compositions or charges
Processes of making
149 199, 149 20, 324 71R, C06B 2300
Patent
active
041674286
ABSTRACT:
A solid propellant grain is converted from a non-conductive filled elasto into a highly-conductive filled elastomer by introducing an effective amount of an alkali metal tungstate or the analogous ammonium salt which, in addition to imparting electrical conductance characteristics, also functions as an oxidizer in the propellant composition. When sodium tungstates, known as tungsten bronzes, or the analogous ammonium salt, are used to replace from 1 to 3 parts of the ammonium perchlorate oxidizer in the propellant formulation, it changes the grain to a highly-conductive grain, and, thereby, permits measuring the continuity of the propellant grain by means of electrical conductance measurements. These conductance measurements provide means of assessing the changes which take place in the solid propellant grain, such as, the physical and chemical changes (which affect mechanical properties) which the grain has undergone during storage or aging or when the grain is subjected to different load conditions, such as, acceleration, blast, shock, etc.
In addition to the benefit of the reliable means for assessing such changes, the propellant grains employing the tungstates show an unpredicted increase in the propellant burning rate. The propellant density also increased due to the high density of the tungsten bronzes, and this is another benefit.
REFERENCES:
patent: 1889462 (1932-11-01), Bazylewicz-Kniazykowski et al.
patent: 3207584 (1965-09-01), Alley et al.
patent: 3682727 (1972-08-01), Heinzelmann et al.
patent: 3698967 (1972-10-01), Thompson et al.
patent: 3762969 (1973-10-01), Sayles
patent: 3864178 (1975-02-01), Rudy et al.
Edelberg Nathan
Gibson Robert P.
Lovering Richard D.
The United States of America as represented by the Secretary of
Voigt Jack W.
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