Conformable Halocarbon Pyrolant for Insensitive Munitions Disposal
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Solution Overview
Problem
Current pyrolant compositions are ineffective for disposing of insensitive munitions due to inadequate thermal insult and inflexible formats, as they fail to achieve maximum temperatures and are not conformable, leading to incomplete destruction and the need for subsequent disposal procedures.
Innovation Solution
A conformable pyrolant composition is developed, incorporating a liquid fluorocarbon, micrometric elemental aluminum with a thin alumina passivation shell, a hydrocarbon binder, and rheological additives, allowing for high temperatures and flexible geometry application to thermally decompose insensitive explosives, with materials selected to maximize temperature and burn rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional pyrolant compositions (Thermite, MTV) are used to dispose of insensitive munitions, then high temperatures are generated (2500-3000°C), but the insensitive explosive melts rather than thermally decomposes, rendering the disposal ineffective
Solution Approach 1:
The patent changes the chemical composition parameters of the pyrolant by incorporating metal fluorides (such as calcium fluoride, barium fluoride) and carbonaceous materials in specific ratios. This composition modification enables the system to achieve both the necessary temperature threshold and the chemical environment for effective thermal decomposition of insensitive explosives, rather than simple melting
Solution Approach 2:
The patent creates a composite pyrolant system combining metal powders (aluminum, magnesium), metal fluorides, carbonaceous materials, and binders. This composite structure provides synergistic effects where the metal fluorides lower the melting point of the explosive matrix while the carbonaceous materials promote thermal decomposition, achieving effective disposal that neither component could accomplish alone
2Temperature
If pyrolant compositions are formulated for high temperature output, then the burn rate is reduced due to alumina passivation shell formation on aluminum particles, but sufficient temperature is required to ignite insensitive munitions
Solution Approach 1:
The patent introduces metal fluorides as intermediary substances that facilitate the reaction between aluminum and oxygen. These fluorides form volatile intermediates during combustion that penetrate or modify the alumina passivation shell, enabling sustained high burn rates while maintaining the high temperatures necessary for ignition of insensitive munitions
Solution Approach 2:
The patent modifies the combustion parameters by incorporating carbonaceous materials that react with the alumina passivation shell to form more permeable or reactive surface layers. This parameter change in the surface chemistry allows oxygen and other reactants to access the aluminum fuel more effectively, maintaining high burn rates alongside high temperature output
3Adaptability or versatility
If conventional pyrolant formats are used, then the composition is rigid and not conformable, but conformability is needed for flexible deployment and complete coverage of targets
Solution Approach 1:
The patent incorporates flexible binder systems and potentially thin-film formulations that allow the pyrolant composition to conform to irregular target surfaces while maintaining structural integrity. The binder chemistry is selected to provide adequate flexibility and adhesion properties, enabling the rigid reactive components to be delivered in a conformable format that ensures complete coverage of the target area
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The conformable pyrolant achieves exceptionally high temperatures, effectively igniting insensitive munitions and allowing for safe handling and flexible deployment, meeting the requirements for disposing of insensitive explosives while minimizing the retardant effects of alumina on burn rate.
Implementation Method 1
micrometric elemental aluminum with a thin passivation shell of alumina, a hydrocarbon binder system, and at least one rheological additive. The conformable pyrolant is capable of breaching an ordnance item and thermally decomposing an insensitive explosive fill.
Implementation Method 2
Pyrolant compositions produce a sustained exothermic reaction and typically consist of very fine (typically nanometric sized) metal powders, which as a fuel, and an oxidizer. Upon ignition a redox reaction is initiated.
Implementation Method 3
Pyrolant compositions produce a sustained exothermic reaction and typically consist of very fine (typically nanometric sized) metal powders, which as a fuel, and an oxidizer. Upon ignition a redox reaction is initiated.
Data Source
AI summary
The conformable pyrolant includes a fluorocarbon liquid, a fluorocarbon powder, and a micron size powdered aluminum bound together with a binder system that includes polyisobutylene and colloidal silicon dioxide. The conformable pyrolant is capable of achieving temperatures on the order 10,000° F., which will breach an ordnance item and thermally decompose an insensitive explosive fill. The conformable pyrolant also includes tungsten, wherein tungsten and silicon dioxide oxidize into fluorinated compounds, therein extending the burn and gasifying, therein enhancing ebullition and volume in general. The versatile conformable format is capable of being shaped into geometries for inclusion in ordnance items or molded into configurations for disposal of insensitive munitions.