Cement Envelope Material for High-Temperature Electrical Devices
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Solution Overview
Problem
Current envelope materials for high-performance electronic modules and sensor systems are limited to a temperature range below 200°C, restricting the operating range of modern semiconductors like SiC, and require additional protective layers that add complexity and cost.
Innovation Solution
A method involving a cement material with an admixture that forms a protective layer during treatment, enhancing mechanical and imperviousness properties by creating a water vapor-impermeable barrier, eliminating the need for separate coating steps and ensuring consistent cement/water ratios, using calcium aluminate cement with specific compositions and treatments like hydration, drying, and heat-treating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If current envelope materials (epoxy compounds, silicone materials) are used, then the manufacturing process is simple, but the temperature range is limited to below 200°C
Solution Approach 1:
The patent uses composite materials by combining cement material with specific admixtures (water repellents, surface-active substances) to create an envelope material that achieves both high temperature resistance (300-350°C) and protective functionality. This composite approach allows the material to withstand higher temperatures while maintaining protection against environmental effects.
Solution Approach 2:
The patent changes the chemical composition parameters of the envelope material by using cement-based compounds with specific admixtures rather than traditional epoxy or silicone materials. This parameter change enables the material to operate at elevated temperatures (300-350°C) while maintaining structural integrity and protective properties.
2Reliability
If a separate moisture-resistant protective layer is applied after cement material sets, then protection from environmental effects is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent merges the protective layer formation with the cement material application step by incorporating water repellent admixtures directly into the cement material before application. This combining of functions eliminates the need for a separate protective layer application step, reducing manufacturing complexity while maintaining environmental protection.
Solution Approach 2:
The cement material provides its own protective functionality through incorporated admixtures that form water-resistant properties during the setting process itself. The material serves its own protection needs without requiring additional external protective layers, thereby simplifying the manufacturing process.
3Productivity
If admixture is mixed into cement material and forms protective layer during treatment, then separate coating steps are eliminated, but control of admixture distribution becomes critical
Solution Approach 1:
The protective layer formation is performed as a preliminary action during the treatment step that follows cement material application. The admixture is incorporated beforehand into the cement material, and the protective layer forms automatically during the subsequent treatment process, eliminating the need for separate coating operations and improving manufacturing efficiency.
4Reliability
If envelope material is applied to envelop electrical component, then protection and thermal properties are improved, but water loss and porosity issues may occur
Solution Approach 1:
Water repellent admixtures act as intermediaries between the cement material and water/moisture. These admixtures modify the surface properties of the cement material to repel water, preventing water loss during setting and reducing porosity, thereby maintaining the protective and thermal properties of the envelope material.
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
Extends the temperature range of envelope materials to 300°C or 350°C, improves reliability and efficiency, and maintains optimal material properties by forming a protective layer in a single manufacturing step, enhancing mechanical strength and imperviousness while preventing water loss and porosity issues.
Implementation Method 1
the treatment causes the admixture from the cement material to arrive at a surface of the cement material and to form a protective layer at this surface
Implementation Method 2
The cement hardens here in a hydraulic manner, meaning that a chemical reaction with water takes place to form stable, insoluble compounds
Implementation Method 3
forming a protective layer in a single manufacturing step, enhancing mechanical strength and imperviousness while preventing water loss
Data Source
AI summary
A method for producing an electrical device including an electrical component at least partially covered by a covering material having a cement material includes supplying the cement material, mixing an additive into the cement material, applying the covering material having the cement material with the additive onto the electrical component, and treating the covering material. The treatment allows the additive from the cement material to reach a surface of the cement material and to form a protective layer on the surface.