Surface-Activated Bonding with Species Replenishment Against Depletion
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Solution Overview
Problem
Existing surface activated bonding methods, such as SAB, suffer from depletion of certain species at the bonding interface, leading to roughening and reduced mechanical strength, especially when bonding materials with multiple chemical species.
Innovation Solution
A surface activated bonding method that involves depositing a layer of the species of interest on one or both surfaces before activation, ensuring that this layer is entirely consumed during the activation process, thereby preventing depletion and eliminating the need for a third-party layer at the bonding interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ion or atom bombardment is used to activate surfaces for bonding, then bonding energy is improved, but material depletion and surface roughening occur
Solution Approach 1:
A layer of the species of interest is deposited onto the first surface before the activation step. This preliminary deposition ensures that when ion or atom bombardment occurs during activation, the species of interest is available to be consumed and incorporated into the bonding interface, preventing material depletion of the underlying substrate while maintaining high bonding energy.
2Strength
If ion or atom bombardment is used to activate surfaces for bonding, then bonding energy is improved, but surface roughening occurs
Solution Approach 1:
By depositing the species of interest layer before activation, the bombardment process consumes this deposited layer rather than eroding the substrate surface. This preliminary action protects the underlying surface from roughening while still achieving the necessary activation for high bonding energy through consumption of the deposited species layer.
3Adaptability or versatility
If modified SAB is used to bond different chemical species, then bonding capability is improved, but a third-party layer is introduced at the bonding interface
Solution Approach 1:
The invention extracts the species of interest from the bulk material and concentrates it in a deposited layer on the surface. During activation, this deposited layer is completely consumed, allowing bonding between different chemical species without leaving a third-party layer at the interface. The species of interest is taken out from the bulk and used exclusively for bonding.
Solution Approach 2:
The invention changes the concentration parameter of the species of interest by depositing it as a surface layer with high concentration, while the bulk material maintains its original composition. This parameter change allows complete consumption of the species during activation without depleting the bulk material, enabling versatile bonding without third-party layers.
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 effectively limits the depletion of surface species, enhances bonding quality, and maintains mechanical strength without requiring additional layers at the bonding interface.
Implementation Method 1
the surface to be bonded is bombarded with a beam of ions or atoms (very often argon) so as to remove the surface oxides and leave only unpaired pendant bonds (thus activating the surface)
Implementation Method 2
activating the second surface by bombarding the second surface with an ion or atom beam
Implementation Method 3
By bringing two surfaces thus treated into contact, covalent bonds are obtained directly at the bonding interface
Data Source
AI summary
A surface activated bonding method by ion or atom bombardment of a first surface of a first substrate to a second surface of a second substrate, the material of the first substrate at the first surface including at least two chemical species, one of which, called the species of interest, becomes depleted upon activation by ion or atom bombardment, the method including depositing a layer of the species of interest onto the first surface of the first substrate; activating the first surface by bombarding the first surface with an ion or atom beam so as to consume the entire previously deposited layer of species; and activating the second surface by bombarding the second surface with an ion or atom beam; and contacting the first surface of the first substrate with the second surface of the second substrate.