Electrically Controlled Propellant Boric Acid Cross-Linking
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Solution Overview
Problem
Existing electrically controlled propellants face issues such as slow extinguishment, energy inefficiency, melting during combustion, and volatility, which affect precision and suitability for applications like orbital attitude control and space use.
Innovation Solution
An electrically controlled propellant comprising a binder, oxidizer, and boric acid as a cross-linking agent, with optional 5-aminotetrazole as a stability-enhancing additive, designed to be processable at room temperature, maintain high conductivity at the combustion surface, and withstand combustion without melting, using polyvinylalcohol and polyvinylamine nitrate copolymers to enhance mechanical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional propellants like Teflon are used as electrically controlled propellants, then they can be controlled by electrical current, but they do not extinguish quickly after the electrical current stops and provide none of their own energy
Solution Approach 1:
The patent changes the chemical composition parameters of the propellant by incorporating ionomeric oxidizer binders and eutectic materials, transforming it from an energy-passive material to an energy-active propellant that releases its own energy during combustion, reducing dependence on external electrical energy sources
Solution Approach 2:
The patent creates a composite propellant system combining ionomeric oxidizer binder, oxidizer salts, eutectic materials, and polar protic high boiling organic liquids, where the synergistic interaction of components enables both rapid extinguishment and self-energy provision
2Reliability
If the propellant is designed to be highly conductive for electrical control, then ignition and combustion control is improved, but the propellant may melt or soften during combustion
Solution Approach 1:
The patent adjusts the molecular weight and composition parameters of the ionomeric oxidizer binder to achieve an optimal balance between electrical conductivity and thermal stability, ensuring the propellant maintains structural integrity at combustion temperatures while remaining electrically controllable
Solution Approach 2:
The patent creates different functional zones within the propellant structure, with the ionomeric oxidizer binder providing conductivity at the combustion surface while the cross-linked polymer network maintains structural stability in the bulk material
3Ease of manufacture
If the propellant uses a mobile phase with sufficient volatility for processing, then it is easier to manufacture, but it evaporates slowly from the surface making it unsuitable for space applications
Solution Approach 1:
The patent selects polar protic high boiling organic liquids with specifically controlled volatility parameters, achieving a balance between manufacturability through processing and suitability for space applications by minimizing unwanted evaporation in vacuum conditions
4Measurement precision
If the propellant is formulated to extinguish quickly when electrical current stops, then precision and accuracy are improved, but it may not sustain combustion reliably
Solution Approach 1:
The patent optimizes the chemical composition parameters including oxidizer concentration, binder type, and additive content to achieve precise control over combustion kinetics, enabling both rapid extinguishment when needed and reliable combustion sustainability when required
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 propellant achieves improved ignition and extinguishment control, increased thruster life, reduced mass, and stability over a wide temperature range, ensuring reliable operation in various environments, including space.
Implementation Method 1
The propellant requires the application of electrical voltage to initiate and sustain combustion
Implementation Method 2
Using the combustion exhaust it may be possible to generate sufficient electrical energy by magnetohydrodynamics (magnetofluiddynamics or hydromagnetic) to sustain and control combustion
Implementation Method 3
A cross-linking agent comprising boric acid has been found to function as a cross-linking agent for the high molecular binder used to make the propellant, thereby improving the composition's ability to withstand combustion without melting
Data Source
AI summary
The present invention is an electrically controlled propellant comprising a binder, an oxidizer, and a cross-linking agent. The boric acid (the cross-linking agent) has been found to function as a cross-linking agent for the high molecular binder used to make the propellant, thereby improving the composition's ability to withstand combustion without melting. The present invention also may include 5-aminotetrazole (5-ATZ) as a stability-enhancing additive. The binder of the present invention may include polyvinylalcohol (PVA) and/or the co-polymer of polyvinylalcohol/polyvinylamine nitrate (PVA/PVAN).