Graphene-Coated Metal Core-Shell Composites for Energetic Materials
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Solution Overview
Problem
Current methods for creating graphene/metal or semi-metal composite materials with shell-core structures face challenges such as high costs, complex processes, poor structural stability, and limited compatibility with energetic materials due to the need for high-temperature sintering and water-based reactions, which are not suitable for active metals or semi-metals.
Innovation Solution
A liquid-phase self-assembly method is used to modify graphene oxide with surface functional groups, allowing it to be coated onto metals or semi-metals, forming a graphene/metal or semi-metal composite with a shell-core structure, which can be processed at lower temperatures and in non-aqueous solvents, maintaining the stability of the metals or semi-metals and improving their compatibility with energetic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If liquid-phase chemical reaction with high-temperature sintering is used to coat metals and metal oxides with graphene, then the coating process can be completed, but the process becomes complex and costly, and the structural stability of the composite material deteriorates
Solution Approach 1:
The invention changes the reaction medium from water to organic solvent, and reduces the temperature from high-temperature sintering (800°C or more) to lower temperature conditions. This parameter change enables the coating process to proceed under milder conditions, simplifying the process while maintaining structural stability of the composite material.
Solution Approach 2:
The invention introduces organic solvent as an intermediary medium to facilitate the coating process. The organic solvent acts as a bridge between the metal/metal oxide substrate and graphene oxide, enabling the coating reaction to occur in liquid phase at lower temperatures without requiring complex high-temperature sintering equipment.
2Ease of manufacture
If water-based reaction medium is used for coating, then the chemical reaction can proceed, but active metals or active semi-metals cannot be coated due to their reactivity with water
Solution Approach 1:
The invention changes the reaction medium from water to organic solvent. This parameter change eliminates the reactivity issue between water and active metals/semi-metals, enabling the coating process to be applied to a broader range of substrates including active metals and semi-metals that would otherwise react with water.
Solution Approach 2:
The organic solvent serves as an intermediary that is chemically inert toward active metals and semi-metals, unlike water. This allows the coating process to proceed without the substrate reacting with the reaction medium, expanding the适用范围 to include active metals and semi-metals.
3Manufacturing precision
If high-temperature sintering at 800°C or more is applied, then the composite material with shell-core structure can be formed, but the cost increases and the process complexity increases
Solution Approach 1:
The invention changes the temperature parameter from high-temperature sintering (800°C or more) to lower temperature conditions. This enables the shell-core structure to form under milder conditions, reducing equipment requirements and process complexity while maintaining manufacturing precision.
Solution Approach 2:
The invention replaces the mechanical/thermal sintering process with a liquid-phase chemical reaction process. Instead of relying on high-temperature thermal energy to form the shell-core structure, the reaction occurs in liquid phase at lower temperatures, substituting a simpler chemical process for a complex thermal process.
4Manufacturing precision
If high-temperature sintering is used, then the coating can be formed, but the cost increases
Solution Approach 1:
The invention changes the temperature parameter from high-temperature sintering (800°C or more) to lower temperature conditions. This parameter change reduces the energy input required for the coating process, thereby reducing energy costs while still achieving proper coating formation.
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
This method enhances the thermal stability and compatibility of the composite materials with high-energy propellants, reduces sensitivity to friction and impact, and increases the specific impulse and burning rate of solid propellants, while maintaining the stability of the coated metals or semi-metals.
Implementation Method 1
By liquid-phase self-assembly, the modified graphene oxide is coated on the surface of a metal or a semi-metal to form a graphene/metal or semi-metal composite material with shell-core structure
Implementation Method 2
modifying graphene oxide by introducing a surface functional group to graphene oxide to obtain a modified graphene oxide
Data Source
AI summary
The present invention relates to a manufactured graphene/metal or metalloid core-shell composite and manufacturing method thereof. The method comprising: using a modified graphene oxide as a base, then performing concentration and steam drying followed by organic solvent replacement to obtain a modified graphene oxide organic solvent; using a liquid-phase self-assembly method to coat the modified graphene oxide onto a surface of the metal or metalloid to form a graphene/metal or metalloid coated particle solution, then filtering and drying to obtain the graphene metal/metalloid core-shell composite. The method improves upon a conventional organic and inorganic material coating technique, and reduces an impact of a water-based solvent and high temperature on a highly reactive metal and metalloid, thereby expanding the feasibility of the coating technique and addressing a barrier of applicability of graphene and reactive metal or metalloid in the field of energetic materials.