Inert Gas Plasma Coating at Atmospheric Pressure for Adhesion Control
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Solution Overview
Problem
Existing plasma coating techniques fail to alter adhesion properties in a controlled manner, particularly due to the use of reactive gases that lead to uncontrolled reactions and loss of adhesion property control, and they are limited by the need for vacuum conditions and the inability to handle a wide range of substrates and precursors.
Innovation Solution
A method using an inert gas plasma at atmospheric pressure with low temperature and minimal reactive gas content, allowing controlled alteration of adhesion properties by introducing a precursor in a plasma afterglow, which avoids direct exposure to plasma zones and electromagnetic fields, enabling treatment of various substrates and precursors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If reactive gases are used in plasma coating to enable coating formation, then coating deposition is achieved, but adhesion property control is lost due to uncontrolled reactions
Solution Approach 1:
The patent uses an inert gas atmosphere (nitrogen or nitrogen-containing gas) as the plasma environment instead of reactive gases. This inert atmosphere prevents uncontrolled chemical reactions between the plasma and precursor molecules, thereby maintaining precise control over adhesion properties while still enabling coating formation through physical deposition and controlled surface interaction.
2Manufacturing precision
If vacuum plasma techniques are used to achieve controlled coating, then coating quality is improved, but processing time increases due to depressurizing steps
Solution Approach 1:
The patent changes the pressure parameter from vacuum conditions to atmospheric pressure operation. By using nitrogen plasma at atmospheric pressure, the process eliminates time-consuming vacuum depressurization and pressurization steps while maintaining controlled coating quality through the inert atmosphere that prevents unwanted reactions.
3Ease of manufacture
If wet coating techniques are used to apply coating material, then coating application is simplified, but drying time increases and environmental stress increases
Solution Approach 1:
The patent replaces wet coating techniques (liquid application followed by drying) with plasma-enhanced physical vapor deposition. The coating material is deposited in a nitrogen plasma environment, forming a coating directly without requiring subsequent drying steps, thereby eliminating both drying time and environmental waste issues associated with solvent evaporation.
4Strength
If high temperature plasma is used to activate surface, then adhesion enhancement is achieved, but substrate damage occurs due to thermal stress
Solution Approach 1:
The patent employs nitrogen plasma at atmospheric pressure, which operates at lower temperatures compared to vacuum plasma techniques. The inert nitrogen atmosphere enables surface activation and coating formation without requiring high temperatures, thereby enhancing adhesion strength while avoiding thermal damage to temperature-sensitive substrates.
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 achieves precise control over adhesion properties, allowing both increased and decreased adhesion as needed, with coatings that are durable, homogeneous, and conformal, suitable for a wide range of materials without the drawbacks of traditional methods.
Implementation Method 1
ionizing a plasma gas at low temperature and at atmospheric pressure, thereby creating a plasma
Implementation Method 2
a substrate film or web is coated by vapor deposition of the vaporized substance at atmospheric pressure in the plasma field
Data Source
AI summary
A method for altering adhesion properties of a surface of a substrate by a coating, comprising the steps of: a) ionizing a plasma gas at low temperature and at atmospheric pressure, thereby creating a plasma with a plasma temperature of at most 50° C.; b) introducing a precursor into a plasma gas afterglow of the plasma; c) subjecting the surface of the substrate to the plasma including the precursor, thereby forming a coating onto the surface. The plasma gas is essentially completely comprised of inert gas. The coating alters the adhesion properties of the surface.