Cold Gas Spraying Metallic Coating on Fiber Composite Walls
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Solution Overview
Problem
Existing methods for coating walls with metal surfaces, such as thermal spraying, can damage easily meltable or mechanically sensitive materials, and pressure vessels made of plastic or fiber composite materials are not chemically resistant or leakproof, leading to issues with thermal expansion and detachment of metallic liners in pressure tanks.
Innovation Solution
A method involving the application of a metallic surface layer onto a fiber composite material using thermal spraying, specifically cold gas spraying, where an intermediate layer with metallic-coated fibers is bonded to an outer wall layer, ensuring a strong and thin metallic coating that adheres effectively without damaging the substrate, and is suitable for use in pressure vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal spraying is used to coat a wall with metal surface, then a metal coating is formed, but easily meltable or mechanically sensitive surface materials are impaired or damaged
Solution Approach 1:
The invention changes the thermal parameters of the spraying process by using cold gas spraying instead of conventional thermal spraying. This parameter change (lowering the temperature of the spray particles) allows coating of temperature-sensitive materials without damage while maintaining coating adhesion through kinetic energy impact
Solution Approach 2:
The invention replaces the thermal mechanism (heat-based melting and bonding) with a mechanical mechanism (kinetic energy-based impact and bonding). Cold gas spraying uses high-velocity particles that bond through mechanical impact rather than thermal melting, preserving the substrate material properties
2Weight of moving object
If a thin metallic liner is used in pressure tanks, then weight is reduced, but the liner detaches from the surrounding structure under temperature and pressure fluctuations
Solution Approach 1:
The invention extracts the problematic thermal expansion mismatch issue by removing the traditional thick metallic liner structure and replacing it with a thin sprayed metal coating on a composite structure, thereby reducing weight while maintaining attachment reliability through the composite material's inherent bonding
Solution Approach 2:
The invention uses composite materials (fiber-reinforced plastic or metal matrix composite) as the base structure with a thin metallic coating, combining the advantages of both materials to achieve lightweight construction while preventing detachment through the composite structure's mechanical interlocking and chemical bonding
3Reliability
If a thick metallic liner is used in pressure tanks, then detachment risk is reduced, but the total weight of the container increases
Solution Approach 1:
The invention changes the structural parameters from a thick monolithic liner to a thin coating on a composite structure, fundamentally altering how the pressure containment function is achieved while reducing weight and maintaining reliability through the composite material properties
4Weight of moving object
If plastic or fiber composite materials are used for pressure vessels, then weight is reduced, but chemical resistance and leakproof properties are insufficient
Solution Approach 1:
The invention uses composite materials (fiber-reinforced plastics or metal matrix composites) that combine the lightweight advantages of polymers or ceramics with the strength and chemical resistance of metal fibers, achieving both weight reduction and improved chemical resistance simultaneously
Solution Approach 2:
The invention applies different material properties to different regions: the composite structure provides lightweight mechanical strength while the metallic coating provides chemical resistance and leakproofness, creating a multi-functional structure with locally optimized properties
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 method provides a reliable, gas-tight, and chemically inert coating that reduces the risk of detachment and enhances mechanical strength, allowing for mass savings and easier repair, while maintaining structural integrity under temperature and pressure fluctuations.
Implementation Method 1
coating the wall on the surface of the intermediate layer facing away from the outer wall layer with the at least one metallic surface layer by means of a spraying device by thermal spraying
Implementation Method 2
cold gas spraying, where an intermediate layer with metallic-coated fibers is bonded to an outer wall layer, ensuring a strong and thin metallic coating that adheres effectively without damaging the substrate
Implementation Method 3
Thermal spraying, in which metal is sprayed onto a surface and forms a mechanical bond with the material of this surface
Implementation Method 4
cold gas spraying has recently become established, in which solid metal particles are sprayed onto the surface to be coated with high kinetic energy, melting as a result of the impact energy and bonding with the material of the surface to be coated
Data Source
AI summary
A method for coating a wall with a metallic surface layer, the wall including an outer wall layer formed from or including a plastic material or a fiber composite material, the method comprising: in a first step providing a wall base body formed by the outer wall layer; therafter in a second step bonding the outer wall layer to an intermediate layer formed from or including a fiber composite material to form the wall to be coated, wherein fibers of the fiber composite material of the intermediate layer include a metallic surface, wherein fibers of the fiber composite material of the intermediate layer connected to the outer wall layer include a non-metallic fiber core coated with a metal or a metal alloy; and thereafter in a third step coating the wall with the metallic surface layer on a surface of the intermediate layer facing away from the outer wall layer.