Layered Thermite Micro Detonator for Thermal and Mechanical Shock
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Solution Overview
Problem
Conventional detonators are too large for use in small projectiles like bullets, and existing thermite structures lack the capability to provide both elevated temperature and mechanical shock necessary for supersonic detonation initiation.
Innovation Solution
A micro detonator with alternating layers of metal oxide and reducing metal, featuring a gradient interface layer between each layer, manufactured using a rotating drum system to maintain rapid deposition and minimize oxidation, ensuring high energy density and susceptibility to mechanical ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional detonators are used, then both elevated temperature and mechanical shock are provided, but the size is too large for small projectiles
Solution Approach 1:
The detonator is segmented into multiple thin alternating layers of metal oxide and reducing metal deposited on a substrate, creating a micro-scale thermite structure that maintains detonation capability while dramatically reducing overall size
Solution Approach 2:
The invention uses a composite structure of alternating metal oxide and reducing metal layers with gradient interface layers, combining materials to achieve both high energy density and mechanical shock generation in a compact form factor
2Volume of moving object
If thermite structures are used to reduce size, then smaller dimensions are achieved, but mechanical shock capability is lost
Solution Approach 1:
The invention changes the physical and chemical parameters of the thermite structure by creating alternating thin layers with gradient interfaces, which modifies the reaction characteristics to generate both thermal and mechanical shock effects
Solution Approach 2:
The composite layered structure of metal oxide and reducing metal with gradient interfaces enables the material to simultaneously provide thermal energy for ignition and mechanical shock for supersonic detonation propagation
3Speed
If surface area of metal oxide and reducing metal is increased to boost reaction speed, then faster reaction occurs, but energy density decreases due to increased reducing metal oxide ratio
Solution Approach 1:
The gradient interface layers create local variations in material composition and structure, optimizing the local reaction characteristics to maintain high energy density while enabling rapid reaction propagation across the entire structure
Solution Approach 2:
The composite layered architecture with gradient interfaces optimizes the ratio of metal oxide to reducing metal at each location, maintaining high energy density while providing sufficient surface area for rapid reaction initiation and propagation
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 micro detonator achieves both thermal and mechanical shock initiation, enabling detonation in smaller sizes suitable for projectiles, enhancing the effectiveness of detonation in applications where conventional detonators are too large.
Implementation Method 1
The micro detonator comprises alternating layers of metal oxide and reducing metal deposited upon the first side of the substrate
Implementation Method 2
Mechanical ignition was achieved in part by manufacturing techniques which resist the formation of a continuous reducing metal oxide at the interface between metal oxide layers and reducing metal layers within the thermite structure
Implementation Method 3
This mechanical shock is necessary because detonation propagates supersonically through a material in the form of a shockwave
Implementation Method 4
Providing only an elevated temperature without the mechanical shock results in ignition or deflagration, which propagates thermally at a subsonic speed
Data Source
AI summary
A micro detonator is provided. The micro detonator is made from thermite consisting of layered metal oxide and reducing metal, separated by gradient interface layers. Oxidation of the reducing metal is resisted during and after deposition of the thermite layers until the exothermic reaction is initiated. Layer thickness can thus be reduced without significantly reducing energy density, resulting in rapid, mechanical propagation of the reaction. The micro detonator can be used as a standalone device or within a projectile containing a second charge.