Alkali Silicate Glass Coating for Moisture and Whisker Protection
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Solution Overview
Problem
Conventional coatings for electronic components and surfaces are susceptible to degradation from moisture, UV radiation, and temperature variations, leading to adhesion and cohesion failures, and can cause whisker formation in metal surfaces, which results in electrical shorting and corrosion, especially in harsh environments.
Innovation Solution
An alkali silicate glass-based coating is applied to electronic components and surfaces, providing a moisture-impermeable barrier that resists corrosion and radiation, and can be doped with elements to enhance radiation protection, while being cured at low temperatures to prevent damage and maintain component reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic coatings are used to protect surfaces, then coating application is straightforward, but the coatings degrade from moisture, UV radiation, and temperature variations leading to adhesion and cohesion failures
Solution Approach 1:
The patent transitions from organic coating chemistry to inorganic glass-based coating chemistry, fundamentally changing the material parameters to achieve resistance against moisture, UV radiation, and temperature variations while maintaining coating durability
Solution Approach 2:
The patent uses composite glass-based coating materials containing multiple oxides (such as silicon oxide, boron oxide, aluminum oxide) combined with specific dopants to create a coating that simultaneously provides protection against multiple harmful factors including moisture, UV radiation, and thermal stress
2Reliability
If conventional inorganic coatings are used to provide environmental protection, then resistance to harsh environments is improved, but expensive and high-stress processing environments are required
Solution Approach 1:
The patent modifies the processing parameters by using sol-gel chemistry and low-temperature curing processes (below 200°C) to deposit and cure glass-based coatings, eliminating the need for expensive vacuum chambers and high-temperature furnaces while maintaining coating quality
Solution Approach 2:
The patent replaces mechanical/physical deposition methods (such as vacuum deposition) with chemical deposition methods (sol-gel process), allowing coatings to be applied from liquid precursors that can be deposited at low temperatures and then cured through chemical reactions
3Reliability
If lead-free solder with tin surface finish is used to eliminate lead disposal concerns, then environmental compliance is improved, but whisker formation occurs causing electrical shorting
Solution Approach 1:
The patent applies glass-based coating materials that contain specific metal oxides which react with tin whiskers during the curing process, converting the harmful whisker growth into a benign glassy matrix that eliminates the shorting risk while maintaining the lead-free soldering benefits
4Temperature
If liquid coolant is used for cooling to improve heat dissipation, then thermal management is improved, but corrosion of the coolant system occurs leading to purity degradation
Solution Approach 1:
The patent introduces a glass-based coating as an intermediary barrier layer between the liquid coolant and the metal coolant system components, preventing direct contact and chemical reactions that cause corrosion, while allowing efficient heat transfer through the coating layer
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 alkali silicate glass coating effectively prevents oxidation, corrosion, and whisker formation, maintaining the purity and conductivity of cooling fluids and enhancing the reliability of electronic components in harsh environments by providing a durable, low-temperature curing solution.
Implementation Method 1
providing a moisture-impermeable barrier that resists corrosion and radiation
Implementation Method 2
resists corrosion and radiation... capable of providing protection from moisture as well as from breakdown by various forms of radiation (such as UV)
Implementation Method 3
being cured at low temperatures to prevent damage and maintain component reliability
Data Source
AI summary
A coating for reducing interaction between a surface and the environment around the surface includes an alkali silicate glass material configured to protect the surface from environmental corrosion due to water or moisture. The alkali silicate glass material is doped with a first element to affect various forms of radiation passing through the coating. The electromagnetic radiation is at least one of ultraviolet, x-ray, atomic (gamma, alpha, beta), and electromagnetic or radio wave radiation. The coating may also be used to protect a solar cell from the environment and UV rays while retransmitting received light as usable light for conversion into electrical energy. The coating may also be used to prevent whisker formation in metal finishes of tin, cadmium, zinc, etc.