SiC Surface-Mount Assembly Using Solder Reflow Metallization
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Solution Overview
Problem
Existing methods for attaching silicon carbide (SiC) components to metal surfaces using epoxy or silver materials require large dispense nozzles, leading to increased device cost, reduced reliability, and higher cure temperatures, which are not suitable for smaller form factor components.
Innovation Solution
Utilizing a solder reflow method with patterned metallization on a silicon carbide substrate to attach SiC components to a support like a PCB, allowing for self-alignment and lower temperature processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If epoxy material is used to attach SiC components, then attachment is achieved, but large dispense nozzle is required increasing cost and component size
Solution Approach 1:
The patent changes the attachment method from epoxy dispensing to solder reflow, fundamentally altering the process parameters. This enables smaller component sizes by eliminating the need for large dispense nozzles and associated dispensing areas, while maintaining effective attachment of SiC components to metal flanges
Solution Approach 2:
The patent replaces the mechanical dispensing system with a thermal reflow system. Instead of using a large dispense nozzle to apply epoxy material, the invention uses solder paste application followed by reflow soldering, substituting mechanical dispensing with a thermal processing approach that enables smaller component footprints
2Ease of manufacture
If epoxy material is used for attachment, then attachment is achieved, but high cure temperature reduces reliability and increases cost
Solution Approach 1:
The patent changes the temperature parameter from high cure temperatures (400°C for epoxy) to lower reflow soldering temperatures, improving device reliability and ruggedness while maintaining effective attachment. This parameter change also reduces manufacturing costs associated with high-temperature processing
3Ease of manufacture
If epoxy material is used for attachment, then attachment is achieved, but exacting placement requirements increase manufacturing time and cost
Solution Approach 1:
The patent replaces the precision mechanical placement system required for epoxy dispensing with a solder reflow system. The solder paste is applied in advance to the metal flange, and components are attached through reflow soldering, eliminating the need for exacting real-time placement and reducing manufacturing time
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
This method reduces assembly time and cost, improves reliability and ruggedness, and enables smaller component sizes with accurate placement, while maintaining high temperature and voltage capabilities.
Implementation Method 1
reflowing a solder to connect the first metallization and the second metallization to a device
Data Source
AI summary
In some aspects, a device includes a substrate. A first metallization arranged on the substrate. A second metallization arranged on the substrate. A circuit arranged on the substrate and electrically connected to the first metallization and the second metallization. The first metallization and the second metallization being configured, structured, and arranged to make a solder connection to a device, where the substrate may include silicon carbide (SiC).