Joint Structure Recess for Brazing Material Control
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Solution Overview
Problem
Conventional semiconductor device storage packages face issues with excessive brazing material collection leading to separation of the metallized layer due to self-contraction, which reduces the strength and reliability of the brazing, and requires reducing the volume of brazing material to prevent separation.
Innovation Solution
A joint structure featuring a ceramic member with a metallized layer and a metal member joined via a brazing material, where the metal member has a base part and an extended part with a recess, allowing for a sufficient fillet formation that accommodates the brazing material and prevents excessive collection, thereby reducing the force applied during self-contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the volume of brazing material is reduced to prevent excessive collection and separation of the metallized layer, then the harmful effect of self-contraction is reduced, but the strength and reliability of the brazing are compromised
Solution Approach 1:
The patent introduces a recess in the extended part of the metal member, creating a new spatial dimension to accommodate the brazing material. This recess provides a designated space for the brazing material to collect without causing harmful effects, while maintaining sufficient brazing material volume for strong joints. The recess acts as a three-dimensional solution to a two-dimensional problem of brazing material distribution.
Solution Approach 2:
The recess serves as an intermediary structure between the brazing material and the metallized layer. It mediates the interaction by providing a controlled environment for brazing material collection, preventing direct harmful contact with the metallized layer while still allowing the brazing material to perform its joining function effectively.
2Strength
If a sufficient volume of brazing material is used to maintain brazing strength, then the reliability of the joint is improved, but excessive brazing material collection occurs leading to separation of the metallized layer
Solution Approach 1:
The recess creates a vertical dimension for brazing material accommodation, allowing sufficient brazing material volume to be used without causing horizontal spread and separation. The brazing material is directed into the recess space, maintaining joint strength while preventing harmful collection at the metallized layer interface.
Solution Approach 2:
The recess provides a localized region with different properties - a designated space specifically for brazing material collection. This local structural modification changes the quality of that specific area to accommodate excess brazing material without affecting the overall joint strength or causing separation at critical interfaces.
3Object-affected harmful factors
If the brazing material volume is reduced to prevent separation, then the harmful effects are minimized, but the manufacturing process requires precise control to avoid compromising joint reliability
Solution Approach 1:
The recess is pre-formed in the metal member before the brazing process. This preliminary structural preparation eliminates the need for precise control during brazing, as the recess automatically guides and accommodates the brazing material. The manufacturing complexity is reduced because the design itself provides the solution rather than requiring complex process control.
Solution Approach 2:
The recess structure enables the brazing process to be self-regulating. The brazing material naturally flows into and is contained by the recess without requiring external control mechanisms. The structure serves itself by providing the necessary containment and distribution of brazing material through its geometric design alone.
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 configuration suppresses the separation of the metallized layer while maintaining the strength and reliability of the brazing, without the need to reduce the brazing material volume, allowing for a stable and durable semiconductor device storage package.
Implementation Method 1
a base part erected on the metallized layer, and an extended part extended from the base part... The base part includes an end joined to the metallized layer by a brazing material layer including the brazing material
Implementation Method 2
excessive brazing material collection leading to separation of the metallized layer due to self-contraction
Data Source
AI summary
A joint structure includes: a ceramic member; a metallized layer formed on a surface of the ceramic member; and a metal member joined to the metallized layer via a brazing material. The metal member includes a base part erected on the metallized layer, and an extended part extended from the base part to define a predetermined gap with respect to the metallized layer. The base part includes an end joined to the metallized layer by a brazing material layer including the brazing material, and a side joined to the metallized layer around the base part by a fillet including the brazing material formed on the metallized layer around the base part. The extended part defines a recess at a position facing the metallized layer on which the fillet is formed.