Ceramic Metal Composite Structure With Nickel Alloy Interface
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Solution Overview
Problem
Current ceramic/metal composite structures face challenges in achieving strong bonding between aluminum oxide and copper layers due to thermal expansion mismatch and high thermal stress, leading to reduced reliability and heat dissipation efficiency in high-power electronic components.
Innovation Solution
A ceramic/metal composite structure is developed with a metal interface layer on a ceramic substrate, where a copper sheet is placed on the interface layer, and multiple stages of pre-oxidizing processes are performed on the copper sheet to enhance bonding strength, using a nickel alloy interface layer to form strong bonds with both the ceramic and copper, reducing thermal stress and porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a ceramic substrate and copper sheet are directly bonded to form a composite structure, then heat dissipation capability is improved, but bonding strength deteriorates due to thermal expansion mismatch and thermal stress
Solution Approach 1:
A metal interface layer is introduced between the ceramic substrate and copper sheet to act as an intermediary. This interface layer has thermal expansion properties that are intermediate between ceramic and copper, reducing thermal stress during temperature cycling. The interface layer also improves wetting and bonding, allowing the copper to adhere strongly to the ceramic while accommodating thermal expansion differences, thus resolving the contradiction between heat dissipation and bonding strength.
2Productivity
If the substrate is made thinner to meet miniaturization requirements, then productivity is improved, but reliability deteriorates due to reduced bonding strength and increased thermal stress
Solution Approach 1:
The metal interface layer serves as a stress-distributing intermediary that maintains bonding reliability even in thin substrates. By improving the bonding interface and reducing thermal stress concentration, the interface layer enables reliable operation of miniaturized components with thinner substrates, thus resolving the contradiction between miniaturization and reliability.
3Strength
If multiple stages of pre-oxidizing processes are performed on the copper sheet, then bonding strength is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple stages of pre-oxidizing processes are performed on the copper sheet before bonding to create a controlled oxide layer that enhances interfacial bonding. This preliminary treatment prepares the copper surface in advance to achieve strong bonding with the ceramic substrate and metal interface layer, resolving the contradiction between interface strength and manufacturing complexity by establishing a robust bonding foundation before assembly.
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
The solution provides enhanced interface strength, improved reliability, and effective heat dissipation capabilities, allowing high-power electronic components to withstand multiple on-off cycles without de-bonding, while maintaining low thermal conductivity and high electrical connectivity.
Implementation Method 1
The metal interface layer provides a wetting effect for the copper sheet to the ceramic substrate at a high temperature so that the copper sheet wets a surface of the aluminum oxide
Implementation Method 2
multiple stages of pre-oxidizing processes are performed on the copper sheet to enhance bonding strength
Implementation Method 3
using a nickel alloy interface layer to form strong bonds with both the ceramic and copper
Data Source
AI summary
A ceramic/metal composite structure includes an aluminum oxide substrate, an interface bonding layer and a copper sheet. The interface bonding layer is disposed on the aluminum oxide substrate. The copper sheet is disposed on the interface bonding layer. The interface bonding layer bonds the aluminum oxide substrate to the copper sheet. Some pores are formed near or in the interface bonding layer. A porosity of the interface bonding layer is substantially smaller than or equal to 25%.