Methanol Slip Composition for Electromagnetic Wave Absorption
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Solution Overview
Problem
Existing slip compositions that disperse electrically conducting or magnetic metal particles in inorganic materials often use water as a vehicle, which can oxidize the metal particles, reducing their electromagnetic wave absorption ability, and lack coatings that effectively reduce electromagnetic wave reflection.
Innovation Solution
A slip composition using a methanol vehicle and a mixture of wet milled vitreous frit and powdered magnetic material, specifically an iron aluminum alloy powder, with a glass frit and a methanol vehicle, to create a coating that absorbs electromagnetic waves without using clay or aluminum oxide, ensuring particle sizes are controlled to maximize absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If water is used as the vehicle in slip composition, then the slip can be easily prepared and applied, but the metal particles oxidize which reduces their electromagnetic wave absorption ability
Solution Approach 1:
The patent changes the chemical parameter of the vehicle from water to organic solvent (alcohol, ketone, or ester), which fundamentally alters the oxidation potential of the system. This parameter change prevents oxidation of metal particles while maintaining slip fluidity and applicability, thus resolving the contradiction between ease of manufacture and reliability of electromagnetic wave absorption
Solution Approach 2:
The patent creates an inert chemical environment by using organic solvents that do not promote oxidation. The vehicle system is designed to be chemically inert toward the metal particles, preventing harmful oxidation reactions while still allowing the slip to be prepared and applied easily, thereby maintaining both manufacturing ease and absorption reliability
2Strength
If clay and aluminum oxide are included in the slip composition, then the coating has good adhesion and coverage, but the electromagnetic wave absorption ability is reduced
Solution Approach 1:
The patent extracts and removes clay and aluminum oxide from the slip composition, eliminating these interfering substances that reduce electromagnetic wave absorption. The formulation uses only glass frit as the inorganic material, combined with organic vehicle and metal particles, achieving both good coating adhesion and superior electromagnetic wave absorption by excluding harmful components
Solution Approach 2:
The patent creates a composite material system consisting of glass frit, organic vehicle, and metal particles (iron, nickel, cobalt, or their alloys). This composite formulation replaces traditional clay-based slips, providing both adequate adhesion through glass frit and enhanced electromagnetic wave absorption through the magnetic metal particles, thus resolving the contradiction between strength and reliability
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 methanol-based slip composition effectively reduces electromagnetic wave reflection and maintains the electromagnetic wave absorption ability of the metal particles, providing a stable and efficient coating for substrates like stainless steel and nickel base alloys.
Implementation Method 1
a slip composition which is useable to make a coating which absorbs electromagnetic waves such as radar
Implementation Method 2
an electromagnetic-absorbing, magnetic material
Data Source
AI summary
A slip composition includes an electromagnetic-absorbing, magnetic powder having a mean particle size of not more than about 6 microns, a glass or vitreous frit having a mean particle size of not more than about 6 microns, and a methyl alcohol vehicle.A method of making a slip composition void of clay and aluminum oxide, includes mixing a wet milled vitreous frit, a powdered magnetic material, and a methyl alcohol vehicle.The disclosed embodiment is particularly useful in making an electromagnetic wave absorption coating suitable for application to stainless steel and many nickel base alloys.