Heavy Inert Gas Insulation for Energetic Material Containers
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Solution Overview
Problem
Existing containers for energetic materials fail to adequately insulate against high external temperatures, leading to premature desensitization or reaction of the energetic materials.
Innovation Solution
Integration of a heavy inert gas insulation layer within the container walls or as inserts, using gases like Argon, Krypton, or Xenon, with a density of at least 1.5 Kg/m3 and thermal conductivity no greater than two-thirds of air, to form a thermal barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air gaps are used for insulation between the energetic material and external environment, then the container structure is simple and lightweight, but the insulation performance is insufficient to delay desensitization or inhibit premature reaction of energetic material due to high external temperatures
Solution Approach 1:
The patent changes the physical parameter of the insulation medium from air to heavy inert gas (such as xenon, krypton, or argon). These gases have lower thermal conductivity than air, providing superior insulation performance. The container walls are modified to include sealed cavities filled with these heavy inert gases, creating a thermal barrier that delays heat transfer to the energetic material while maintaining structural integrity.
Solution Approach 2:
The patent employs a composite insulation system combining multiple layers: outer container wall, heavy inert gas-filled sealed cavity, and inner container wall. This multi-layer composite structure integrates different materials (metal walls and inert gas) to achieve enhanced thermal insulation performance that neither component could provide alone, effectively delaying desensitization of energetic materials.
2Reliability
If phenolic resin lining is used to provide heat resistance, then thermal protection is improved, but the insulation effectiveness is still insufficient compared to heavy inert gas layers
Solution Approach 1:
The patent transitions from using phenolic resin (a solid material with higher thermal conductivity) to heavy inert gases (gases with lower thermal conductivity). This parameter change in the state of matter and thermal properties provides superior thermal protection with potentially reduced material quantity, as the gas-filled sealed cavities create more effective thermal barriers.
3Strength
If double-walled metal construction with air filling is used, then structural support is provided by ribs or corrugated structure, but the thermal insulation is inadequate for high external temperature environments
Solution Approach 1:
The patent creates a composite structure combining the structural advantages of double-walled metal construction with the thermal insulation advantages of heavy inert gases. The sealed cavity between walls is filled with heavy inert gas, maintaining the structural integrity provided by ribs or corrugated structures while adding superior thermal insulation properties that resist high external temperatures.
Solution Approach 2:
The patent modifies the thermal parameter of the double-walled structure by replacing air with heavy inert gases in the sealed cavity. This parameter change significantly reduces thermal conductivity while preserving the structural support function of the metal walls and reinforcement elements.
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 heavy inert gas insulation effectively delays desensitization and inhibits premature reaction of energetic materials by providing superior thermal insulation compared to air or phenolic resin, maintaining stability and safety.
Implementation Method 1
An inert gas fills the sealed void space. The inert gas has a density of at least 1.5 Kg/m3 and a thermal conductivity (Tcond_gas) of no greater than two-thirds of a thermal conductivity of air (Tcond_air) to form the heavy inert gas insulation layer.
Data Source
AI summary
Heavy inert gas insulation layer(s) are provided for containers configured to contain components that include an energetic material. The heavy inert gas insulation layer delays desensitization or inhibits premature reaction of the energetic material due to high external temperatures. The layers may be formed in hollow walls of the container itself or as inserts that are attached to the container. An inert gas fills a sealed void space in the walls or the insert. The inert gas has a density of at least 1.5 Kg/m3 and a thermal conductivity (Tcond_gas) of no greater than two-thirds of a thermal conductivity of air (Tcond_air) to form the heavy inert gas insulation layer. The inert gas may be Argon, Krypton, Xenon or a synthetic gas and is suitably held at a pressure of 760 Torr (1 atmosphere) or greater at sea level.