Combustible Propellant Charge Case With Uniform MoO3/WO3 Dispersion
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Solution Overview
Problem
Existing ammunition propellant cartridge cases with metal oxide particles like MoO₃ and WO₃ suffer from high tube wear due to non-uniform particle distribution and concentration fluctuations, leading to severe barrel erosion and reduced accuracy.
Innovation Solution
Incorporating a cationic surfactant during the manufacturing process of the propellant cartridge case to achieve a uniform and narrow particle size distribution of MoO₃ and/or WO₃ particles, ensuring consistent concentration levels, thereby reducing tube wear by minimizing temperature and pressure spikes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate components (case, primer, propellant, detonating composition) are used, then reliability and safety are improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent combines multiple separate components (case, primer, propellant charge, and detonating composition) into a single integrated combustible propellant charge case. The case itself is formed from a combustible material that serves as both the container and the propellant, eliminating the need for separate components and reducing assembly steps while maintaining reliability through controlled combustion characteristics.
Solution Approach 2:
The combustible propellant charge case serves multiple functions simultaneously: it acts as the container structure, the propellant material, and the combustion source. This multi-functionality reduces the number of components needed while ensuring reliable operation through the coordinated design of the combustible material composition and geometry.
2Reliability
If separate components are used, then safety is improved by preventing premature ignition, but the number of manufacturing steps and potential failure points increase
Solution Approach 1:
By merging the case and propellant into a single combustible structure, the patent eliminates multiple assembly steps and potential failure points associated with joining separate components. The integrated design simplifies manufacturing while maintaining safety through controlled ignition propagation from the initiator through the combustible material.
3Strength
If a non-combustible case with separate propellant is used, then structural integrity is maintained, but overall device mass increases
Solution Approach 1:
The patent employs a combustible material composition that provides both structural integrity and propellant function. The composite nature of the combustible material allows it to maintain structural strength while containing the propellant charge, eliminating the need for additional non-combustible case materials and reducing overall device mass.
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 uniform particle distribution and concentration of MoO₃ and/or WO₃ particles in the propellant cartridge case significantly reduce tube wear, enhancing the service life and firing accuracy of gun barrels.
Implementation Method 1
a combustible propellant charge case comprising a case formed from a combustible material composition
Implementation Method 2
an explosive initiator in communication with the combustible material composition
Data Source
AI summary
The invention relates to a combustible propellant charge case for ammunition dischargeable from a gun barrel, comprising cellulose, nitrocellulose, MO3 particles, wherein M = Mo and/or W, and cationic surfactant, wherein the average particle size d50 of the MO3 particles is 0.5–2.0 µm, the maximum particle size d100 of the MO3 particles is ≤ 20 µm, and the quotient of the average MO3 concentration in wt.% in a volume element of approximately 0.05 to 1.0 cm3 (cVE) at any desired point in the propellant charge case and the total MO3 concentration in wt.% (ctot) in the propellant charge case is cVE:ctot = 0.80–0 1.20.