Metal Surface Diffusion Bonding Below 300°C for Conductive Joints
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Solution Overview
Problem
Current methods for producing permanent, electrically conductive metallic connections between metal surfaces require high temperatures, making them economically inefficient and prone to mechanical defects due to the use of foreign materials and eutectic connections, which are brittle and have narrow tolerance requirements.
Innovation Solution
The method involves creating surface defects near the metal surfaces through ion implantation and applying thin metal layers of inferior quality or metallic nanoparticles to facilitate substitution diffusion at reduced temperatures, allowing for the formation of diffusion bonds at temperatures below 300°C, thereby reducing process time and eliminating the need for foreign materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature diffusion bonding is used to produce permanent metallic connections, then reliable electrically conductive connections are achieved, but process temperature becomes excessively high (above 300°C) causing economic inefficiency and component damage
Solution Approach 1:
The metal surfaces are pre-conditioned through ion implantation to create surface defects and modify surface properties before bonding. This preliminary action enables diffusion bonding to occur at significantly reduced temperatures (below 300°C) by preparing the surfaces to facilitate atom diffusion, thus resolving the contradiction between achieving reliable connections and avoiding excessive temperatures
Solution Approach 2:
The invention changes the physical and chemical parameters of the metal surfaces through ion implantation, creating surface defects and altering surface energy characteristics. These parameter changes enable diffusion bonding at lower temperatures by increasing surface reactivity and reducing diffusion barriers, thereby solving the temperature-reliability contradiction
2Temperature
If eutectic connections with foreign materials are used to reduce bonding temperature, then process temperature is reduced, but mechanical defects occur due to brittleness and narrow tolerance requirements
Solution Approach 1:
The invention extracts and eliminates the need for foreign materials and eutectic connections by using pre-conditioned metal surfaces that can diffuse bond directly to each other at reduced temperatures. This removal of foreign materials prevents the mechanical defects and brittleness associated with eutectic connections while maintaining low process temperatures
Solution Approach 2:
The invention achieves homogeneous metal-to-metal diffusion bonds without foreign material interfaces. By creating direct diffusion bonds between identical or compatible metal surfaces, the structure remains homogeneous and free from the intermetallic compound layers that cause brittleness in eutectic connections, thus improving mechanical stability
3Ease of manufacture
If foreign materials are used in connection planes to facilitate bonding, then bonding process becomes easier, but additional materials and infrastructure requirements increase manufacturing complexity and cost
Solution Approach 1:
The metal surfaces are pre-conditioned with ion implantation to self-facilitate diffusion bonding without requiring foreign materials or additional bonding infrastructure. The surfaces themselves become capable of bonding at reduced temperatures through the created surface defects, eliminating the need for external bonding aids and simplifying manufacturing infrastructure
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 approach enables the production of stable, electrically conductive connections at lower temperatures, enhancing economic efficiency and preventing mechanical defects by promoting substitution diffusion and optimizing surface conditions for bonding.
Implementation Method 1
creating surface defects near the metal surfaces through ion implantation
Implementation Method 2
metal atoms or molecules diffuse back and forth between the two surfaces and thus establish a permanent, metallically conducting and mechanically extremely stable connection
Data Source
AI summary
A process for the production of a permanent, electrically conductive connection between a first metal surface of a first substrate and a second metal surface of a second substrate, wherein a permanent, electrically conductive connection is produced, at least primarily, by substitution diffusion between metal ions and/or metal atoms of the two metal surfaces.