Bismuth Oxide Primer Composition for Small Arms Ignition
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Solution Overview
Problem
Current small arms ammunition primers contain toxic components like lead styphnate and barium nitrate, which pose health hazards and are not suitable for high-moisture environments, leading to potential ignition failures due to side chemical reactions.
Innovation Solution
Development of priming mixtures using bismuth oxide as a non-hygroscopic and non-corrosive oxidizer system, combined with primary explosives and other oxidizers, to create a safer and more effective ignition source for small arms ammunition and other applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If barium nitrate is used as an oxidizer in primer mixes, then the ignition performance is improved, but health hazards increase due to toxicity
Solution Approach 1:
The patent substitutes barium nitrate with bismuth oxide, changing the chemical composition parameter while maintaining the oxidizer function. This substitution eliminates the toxicity issue while preserving ignition performance, as bismuth oxide is non-toxic and provides equivalent oxidative capability.
Solution Approach 2:
The patent employs bismuth oxide as a replaceable oxidizer that can be used in primer formulations without the long-term health accumulation concerns of barium nitrate. The focus is on creating a disposable primer component that does not create persistent toxic environmental or health issues.
2Temperature
If inorganic nitrate salts like potassium nitrate are used as oxidizers, then the melting point and oxygen availability are improved, but hygroscopicity increases making them susceptible to atmospheric moisture
Solution Approach 1:
The patent changes the physical-chemical parameters of the oxidizer by selecting bismuth oxide, which has appropriate melting point characteristics for primer operation while being non-hygroscopic. This parameter selection resolves the contradiction between thermal properties and moisture susceptibility.
Solution Approach 2:
The patent applies the principle of local quality by selecting an oxidizer (bismuth oxide) that has locally optimized properties: it possesses the necessary high melting point for ignition function while simultaneously having low hygroscopicity for storage reliability. Each property is locally optimized in the same material.
3Ease of manufacture
If conventional primer mixes are used in high-moisture environments, then the assembly process is simplified, but side chemical reactions occur reducing sensitivity to impact and ignition
Solution Approach 1:
The patent changes the chemical composition parameter by using bismuth oxide instead of conventional oxidizers, which alters the chemical reactivity profile. This change eliminates unwanted side reactions in high-moisture environments while maintaining the desired impact and ignition sensitivity.
Solution Approach 2:
The patent converts the potential harm of high-moisture assembly environments into a benefit by using bismuth oxide, which is non-hygroscopic and chemically stable in moisture. The moisture that would normally cause problems with conventional oxidizers becomes irrelevant, allowing simplified assembly without compromising reliability.
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 bismuth oxide-based priming mixtures reduce toxic material content, enhance storage and handling safety, and maintain sensitivity and performance across various conditions, meeting or exceeding industry standards for ignition and ballistics.
Implementation Method 1
The present invention generally encompasses compositions and methods of preparing priming mixtures for small arms ammunition comprising oxidizer systems containing bismuth oxide
Data Source
AI summary
A priming mixture is provided having a primary explosive and an oxidizer system containing bismuth oxide. The priming mixture generally is applicable to any application or device that employs ignition of a propellant or fuel, including, but not limited to, air bag gas generator systems, signaling devices, ejection seats, small or large arms ammunition primers, and the like.