Aqueous Phosphate Cement Coating for Electronic Thermal Management
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Solution Overview
Problem
Aqueous phosphate cement coating compositions for electronic components face challenges with poor flow properties and adhesion, particularly for semiconductor modules that generate significant heat, leading to potential self-destructive temperatures without adequate insulation and heat dissipation.
Innovation Solution
A composition comprising aqueous phosphoric acid, hydrogen phosphates, oxides, particulate fillers, and urea compounds, which improves flow behavior and adhesion by reducing viscosity, allowing for effective hydraulic hardening and encapsulation of electronic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aqueous phosphate cement coating composition is used for electronic components, then electrical insulation and heat dissipation are achieved, but flow properties and adhesion are poor
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by introducing specific urea compounds (melamine, cyanuric acid, and their condensation products) in controlled amounts (0.1-10 wt% of phosphoric acid). This compositional parameter change improves flow properties and adhesion while maintaining the electrical insulation and heat dissipation functions of the phosphate cement coating.
Solution Approach 2:
The patent creates a composite coating system combining phosphate cement with urea-based compounds (melamine, cyanuric acid). This composite approach integrates the heat dissipation and insulation properties of phosphate cement with the flow-enhancing and adhesion-improving characteristics of urea compounds, resolving the contradiction between functional performance and application properties.
2Ease of operation
If viscosity is reduced to improve flow behavior, then adhesion improves, but coating stability may be compromised
Solution Approach 1:
The urea compounds (melamine, cyanuric acid) act as intermediary substances that modify the rheological properties of the phosphate cement coating. These intermediaries reduce viscosity and improve flow behavior without compromising the fundamental stability of the phosphate cement system, as they chemically interact with the coating components to create a stable composite structure.
Solution Approach 2:
The patent carefully controls the concentration parameters of urea compounds within specific ranges (0.1-10 wt% of phosphoric acid for melamine and cyanuric acid individually). This parameter optimization ensures sufficient viscosity reduction for improved flow and adhesion while maintaining coating stability through controlled chemical interactions.
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 improved flow properties and adhesion of the composition result in enhanced thermal management and electrical insulation for electronic components, preventing overheating and ensuring reliable operation.
Implementation Method 1
the flow properties of aqueous phosphate cement coating compositions can be unexpectedly improved by adding certain urea compounds in the sense of reducing viscosity
Implementation Method 2
The aqueous coating composition can be used to produce a hydraulically hardened coating of an electronic component
Implementation Method 3
Coverings of electronic components made from such aqueous phosphate cement coating compounds serve in particular for electrical insulation and heat dissipation from the electronic component to the outside during operation
Implementation Method 4
Coverings of electronic components made from such aqueous phosphate cement coating compounds serve in particular for electrical insulation
Data Source
AI summary
The invention relates to a composition consisting of: (a) 1 to 30 wt.% of a 1 to 90 wt.% aqueous phosphoric acid and/or at least one hydrogen phosphate selected from the group consisting of mono- and dihydrogen phosphates of sodium, potassium, ammonium, magnesium, calcium, aluminium, zinc, iron, cobalt and copper; (b) 1 to 40 wt.% of at least one compound selected from the group consisting of oxides, hydroxides and oxide hydrates of magnesium, calcium, iron, zinc and copper; (c) 40 to 95 wt.% of at least one particulate filling material selected from the group consisting of glass; mono-, oligo- and polyphosphates of magnesium, calcium, barium and aluminium; calcium sulphate; barium sulphate; simple and complex silicates comprising sodium, potassium, calcium, aluminium, magnesium, iron and/or zirconium; simple and complex aluminates comprising sodium, potassium, calcium, magnesium and/or zirconium; simple and complex titanates comprising sodium, potassium, calcium, aluminium, magnesium, barium and/or zirconium; simple and complex zirconates comprising sodium, potassium, calcium, aluminium and/or magnesium; zirconium dioxide; titanium dioxide; aluminium oxide; silicon dioxide; silicon carbide; aluminium nitride; boron nitride and silicon nitride; (d) 1 to 10 wt.% of at least one urea compound selected from the group consisting of imidazolidin-2-one, allantoin and imidazolidinyl urea; and (e) 0 to 15 wt.% of at least one component that is different to the components (a) to (d).