Polymeric Thermal Spray Coating for Field Application Flexibility
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Solution Overview
Problem
Existing electrostatic coating methods are limited to controlled environments and cannot efficiently apply polymeric coatings in field settings, lacking flexibility and requiring specialized equipment.
Innovation Solution
A thermal spray method using a combustion chamber and injection nozzle assembly to heat and direct polymeric coating particles onto substrates, followed by post-heating to form smooth coatings, allowing for flexible application outside controlled environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrostatic coating methods are used, then coating deposition can be achieved, but the process is limited to controlled environments and cannot be applied in field settings
Solution Approach 1:
The patent replaces the electrostatic field-based deposition mechanism with a thermal spray mechanism. Instead of using electrostatic charges to attract and deposit coating particles, the invention uses thermal energy to melt particles and a fluid stream to propel them onto the substrate. This substitution eliminates the requirement for controlled environmental conditions and complex electrostatic equipment, enabling field application while maintaining coating effectiveness.
Solution Approach 2:
The invention changes the fundamental parameters of the coating process from electrostatic (charge-based) to thermal (temperature-based). By heating coating particles to melting point and using fluid dynamics rather than electrostatics for particle delivery, the system achieves adaptability to uncontrolled environments while reducing device complexity associated with electrostatic control systems.
2Adaptability or versatility
If thermal spray method is used, then field application capability is achieved, but coating smoothness and reproducibility must be maintained
Solution Approach 1:
The patent incorporates a post-heating step after the thermal spray deposition. This preliminary action of heating the coating material before deposition, followed by post-deposition heating, ensures proper melting, flow, and leveling of the coating material. This two-stage heating process (pre-heating during spray and post-heating after deposition) maintains coating uniformity and reproducibility even when applied in uncontrolled field environments.
Solution Approach 2:
The invention maintains continuous heating action throughout the coating process - from pre-heating the particles during spray to post-heating after deposition. This continuous thermal action ensures that the coating material remains in a plastic state long enough to flow and level properly, achieving smooth, uniform coatings despite the mobility and environmental variability inherent in field applications.
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
Enables the application of polymeric coatings with high reproducibility and favorable properties like color, gloss, and adhesion directly on various substrates, including metals and polymers, without the need for electrostatics or controlled booths.
Implementation Method 1
a combustion chamber including a combustion zone structured and arranged to receive a fuel/air mixture
Implementation Method 2
heating particles of a powder polymeric coating material with a thermal spray applicator
Implementation Method 3
post-heating the deposited coating on the substrate to form the polymeric coating
Data Source
AI summary
Methods of thermal spraying polymeric coatings are disclosed. A powder polymeric coating material is introduced into a thermal spray applicator. Particles of the polymeric coating material are heated by the thermal spray applicator, and the heated coating particles are directed toward a substrate to form a deposited coating. The deposited coating may be post-heated onto the substrate to form the polymeric coating with desirable surface characteristics. Thermal spray coating systems are also disclosed for thermally spraying the polymeric coatings. The thermal spray applicator may include a combustion chamber and an injection nozzle assembly that transfers coating powders to a heated zone generated from the combustion chamber.