Joining Dissimilar Materials via Surface Decoration and Sinter-Bonding
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Solution Overview
Problem
Existing methods for joining dissimilar materials like metals and ceramics often require a third material, which can limit their usefulness, especially in applications where the interface is critical, or where the third material is incompatible with system requirements.
Innovation Solution
A method involving the decoration of the more ductile material's surface with particles of a less ductile material, followed by sinter-bonding to a joining member of the less ductile material, creating a strong bond with a sharp interface without the need for chemical interaction or additional materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a third material (solder, braze, weld filler, or adhesive) is introduced into the joint to join dissimilar materials, then the joining process becomes feasible and reliable, but the usefulness of the joint is limited, especially for devices where utility is derived from the interface itself or where the third material is incompatible with system requirements
Solution Approach 1:
The invention extracts and eliminates the third material (solder, braze, weld filler, or adhesive) from the joining process. By directly bonding the dissimilar materials through surface decoration and sintering, the method removes the intermediary substance that limits interface utility and compatibility, while maintaining reliable joining through direct material-to-material bonding.
Solution Approach 2:
The invention uses a thin layer of particles of the less ductile material deposited on the more ductile material surface as an intermediary structure. This particle layer serves as a transition zone that enables direct bonding between dissimilar materials without requiring a third joining material, thus maintaining interface utility while achieving reliable joining.
2Strength
If chemical reaction between metal and ceramic is used to join dissimilar materials, then bonding can be achieved, but the materials must be chemically reactive towards each other, limiting applicability to chemically inert material combinations
Solution Approach 1:
The invention replaces chemical reaction-based bonding with a mechanical and physical bonding process. By using surface decoration with particles followed by sintering, the method achieves strong bonding through mechanical interlocking and diffusion bonding mechanisms rather than chemical reactions, enabling joining of chemically inert materials like metal and ceramic that do not react with each other.
3Strength
If brazing using a filler alloy is used to join metal and ceramic, then bonding can be achieved, but the filler alloy must be compatible with both materials, which can limit system requirements and interface utility
Solution Approach 1:
The invention extracts and eliminates the filler alloy from the joining process. By directly bonding the metal and ceramic through particle decoration and sintering, the method removes the intermediate filler material that adds compositional complexity and potential incompatibility issues, while achieving strong joints through direct material bonding.
4Strength
If a cermet interlayer is used between metal and ceramic to act as a transition zone, then bonding can be achieved, but the cermet adds an additional material layer that may be incompatible with system requirements
Solution Approach 1:
The invention extracts and eliminates the cermet interlayer from the joining structure. By using a thin layer of particles of the less ductile material deposited on the more ductile material surface followed by sintering, the method achieves interface bonding without requiring a cermet interlayer, thus maintaining system compatibility and interface utility.
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 achieves a strong and reliable bond between dissimilar materials with different ductility, suitable for chemically inert materials like metals and ceramics, enabling applications in electrochemical devices and other systems where a sharp interface is necessary.
Implementation Method 1
sinter-bonding the composite produced to a joining member of a less ductile material
Data Source
AI summary
A method of joining dissimilar materials having different ductility, involves two principal steps: Decoration of the more ductile material's surface with particles of a less ductile material to produce a composite; and, sinter-bonding the composite produced to a joining member of a less ductile material. The joining method is suitable for joining dissimilar materials that are chemically inert towards each other (e.g., metal and ceramic), while resulting in a strong bond with a sharp interface between the two materials. The joining materials may differ greatly in form or particle size. The method is applicable to various types of materials including ceramic, metal, glass, glass-ceramic, polymer, cermet, semiconductor, etc., and the materials can be in various geometrical forms, such as powders, fibers, or bulk bodies (foil, wire, plate, etc.). Composites and devices with a decorated/sintered interface are also provided.