Cyclic Pulse Discharge Nano Coating for Heat Dissipation
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Solution Overview
Problem
Current methods for preparing conformal coatings, such as Parylene and plasma chemical vapor deposition, face challenges including inadequate thickness, high material costs, strict preparation conditions, and poor heat dissipation and signal transmission properties, which limit their effectiveness in protecting electronic devices from corrosive environments.
Innovation Solution
A method involving high duty ratio pulse discharge with a cyclic pretreatment and coating process, using a combination of mono-functional and poly-functional monomers, to form a compact, multi-layer nano coating that enhances bonding and protective properties while maintaining efficient heat dissipation and signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Parylene coating is applied to provide effective corrosion protection, then the coating thickness must be increased to 30 micrometers or greater, but this causes poor heat dissipation and signal blocking
Solution Approach 1:
The patent employs an ultrathin nano coating film with thickness of 1-100 nanometers (one-thousandth to one-millionth of traditional coating thickness) to provide corrosion protection. This ultra-thin film structure allows heat and signals to pass through while maintaining protective functionality, resolving the contradiction between protection effectiveness and heat dissipation.
Solution Approach 2:
The patent changes the thickness parameter from micrometer level (30 micrometers or greater) to nanometer level (1-100 nanometers), representing a thousand-fold reduction. This parameter change enables the coating to provide adequate corrosion protection while allowing heat and electromagnetic signals to penetrate through, eliminating the trade-off between protection and thermal/electrical performance.
2Reliability
If traditional plasma chemical vapor deposition is used to form conformal coating, then the coating provides corrosion protection, but the preparation conditions are strict and material costs are high
Solution Approach 1:
The patent introduces cyclic large-duty-ratio pulse discharge mode with specific parameters (frequency 1-1000 Hz, duty ratio 1:1 to 1:1000, power density 0.1-10 W/cm²) to enable effective conformal coating formation under more relaxed conditions compared to traditional continuous plasma methods, reducing material costs and simplifying preparation requirements.
Solution Approach 2:
The patent employs cyclic pulse discharge with periodic on-off cycles to control plasma formation and monomer deposition. This periodic action allows for better control of coating thickness and uniformity while reducing overall energy input and material requirements, making the process more economical and easier to manufacture.
3Loss of energy
If low duty ratio pulse discharge is used for coating preparation, then energy consumption is reduced, but the coating compactness and durability are insufficient
Solution Approach 1:
The patent uses cyclic pulse discharge with optimized duty ratios (1:1 to 1:1000) and frequencies (1-1000 Hz) to balance energy efficiency with coating quality. The periodic plasma generation creates sufficient energy input during active phases to ensure compact coating structure and strong adhesion, while the off-phases allow for controlled deposition and reduce overall energy consumption.
Solution Approach 2:
The patent optimizes multiple parameters including power density (0.1-10 W/cm²), frequency (1-1000 Hz), and duty ratio (1:1 to 1:1000) to achieve the optimal balance between energy consumption and coating durability. These parameter changes enable the formation of compact, durable coatings with excellent adhesion while maintaining low energy input compared to traditional continuous plasma methods.
4Reliability
If thick coating is applied to enhance protection, then corrosion resistance is improved, but heat dissipation and signal transmission are affected
Solution Approach 1:
The patent applies an ultrathin nano coating film (1-100 nanometers thick) that acts as a flexible protective barrier. This ultra-thin structure provides adequate corrosion resistance while being transparent to heat and electromagnetic signals, allowing energy and signals to pass through with minimal attenuation, thus resolving the contradiction between protection and signal transmission.
Solution Approach 2:
The patent changes the coating thickness parameter from traditional thick coatings (micrometer scale) to ultrathin nano coatings (nanometer scale, 1-100 nm). This thousand-fold reduction in thickness maintains corrosion protection functionality while eliminating the blocking effect on heat and signals, allowing all three requirements to be satisfied simultaneously.
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 a more compact and durable nano coating with improved resistance to water, moisture, acids, and alkalines, extending the service life of electronic devices and reducing material usage, thus enhancing production efficiency and environmental friendliness.
Implementation Method 1
enable the plasma discharge, and carry out chemical vapor deposition
Implementation Method 2
carry out chemical vapor deposition; Plasma chemical vapor deposition (PCVD) is a technology that uses plasma to activate reaction gases
Data Source
AI summary
A method for cyclically preparing a multi-functional nano protective coating through high duty ratio pulse discharge is provided, which belongs to the field of plasma technologies. This method vacuums a reaction chamber and then sends in an inert gas; makes the substrate to move in the reaction chamber; sends a monomer vapor into the reaction chamber and carries out chemical vapor deposition process, which consists of pretreatment and coating phases. In the pretreatment phase, the plasma discharge mode is high power continuous discharge; in the coating phase, the plasma discharge mode is high duty ratio pulse discharge. The pretreatment and coating phases are cyclically repeated at least once. During the coating process, the introduction of this cycle is conducive to generating more active sites on the substrate, improving the effective coating, and resulting in a more compact coating structure. A nano coating with a multiple layer composite structure is obtained, which provides multiple layers of protection for the product itself. There is a more compact coating structure microscopically, while on the macro level, it shows excellent hydrophobic property, adhesive force, acid and alkali resistance, mechanical property, and dampness and heat resistance performance.