Metal-Ceramic Substrate HIP Joining with Interlayer Void Control
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Solution Overview
Problem
Existing methods for producing metal-ceramic substrates face challenges in achieving void-free, energy-efficient, and process-safe joining of metal layers to ceramic layers, particularly in high-temperature processes like DCB or DAB.
Innovation Solution
A method involving hot isostatic pressing with an additional metal layer between the metal ply and ceramic element, using controlled gas pressure and temperature below the metal's melting point to form a metal-ceramic substrate without voids, utilizing a gas-tight container and optional functional layers to prevent interdiffusion and grain growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot isostatic pressing is used to join metal layer to ceramic layer, then bonding strength and void-free joining is improved, but process complexity and equipment requirements worsen
Solution Approach 1:
The process segments the joining operation into distinct stages: first forming the metal-ceramic assembly with solder material, then applying hot isostatic pressing as a separate post-treatment step. This segmentation allows the complex HIP process to be applied only when needed for void elimination, rather than requiring complex equipment for the entire joining process.
Solution Approach 2:
Solder material acts as an intermediary between the metal layer and ceramic layer during the joining process. The solder material facilitates bonding at lower temperatures and creates a buffer that allows subsequent HIP treatment to eliminate voids without requiring the metal and ceramic to be in direct contact during the complex HIP process.
2Ease of manufacture
If direct metal joining method (DCB/DAB) is used, then process simplicity is improved, but energy consumption and temperature requirements worsen
Solution Approach 1:
Solder material serves as a mediator that enables joining at lower temperatures compared to direct metal-ceramic bonding. The solder material has a lower melting point and forms intermediate bonds, reducing the peak temperature energy input required while maintaining bonding effectiveness.
Solution Approach 2:
The process changes the temperature parameter by using solder material that melts at a lower temperature than direct metal-ceramic joining methods. This parameter change reduces energy consumption while the subsequent HIP step adjusts pressure and temperature parameters to eliminate voids without requiring excessively high energy input.
3Strength
If active soldering method is used, then bonding strength is improved, but void formation and process safety worsen
Solution Approach 1:
The metal layer and ceramic layer are pre-assembled with solder material in a controlled manner before the actual joining process. This preliminary arrangement ensures proper positioning and reduces the risk of void formation during heating, improving process safety while maintaining bonding strength.
Solution Approach 2:
The potential harm of void formation during active soldering is converted into a benefit by applying HIP treatment afterward. The pressure and temperature conditions of HIP cause voids to collapse and eliminate, transforming the initial defect into a void-free, high-reliability bond. The solder material's flow during cooling then fills any remaining spaces, converting potential voids into strong metallic bonds.
4Adaptability or versatility
If solder material is used for joining, then bonding flexibility is improved, but void formation and purity worsen
Solution Approach 1:
The process maintains continuous useful action by applying HIP treatment immediately after the soldering process while the assembly is still in the processing equipment. This continuous action eliminates voids formed during soldering without interrupting the production flow, maintaining both flexibility and precision.
Solution Approach 2:
The HIP process changes the pressure and temperature parameters from the soldering stage to the void elimination stage. By adjusting these parameters systematically, the process maintains bonding flexibility from the solder material selection while achieving void-free quality through controlled parameter transitions during HIP treatment.
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 method produces void-free metal-ceramic substrates with improved bonding quality, reduced pore formation, and eliminates the need for silver-containing solder base materials, enabling narrower isolation trenches and efficient heat dissipation.
Implementation Method 1
forming the metal-ceramic substrate by hot isostatic pressing
Data Source
AI summary
The invention relates to a process for producing a metal-ceramic substrate (1), comprising: —providing a ceramic element (10), a metal ply (40) and at least one metal layer (30), —forming an ensemble (18) of the ceramic element (10), the metal ply (40) and the at least one metal layer (30), —forming a gas-tight container (30) surrounding the ceramic element (10), wherein the at least one metal layer (30) is arranged between the ceramic element (10) and the metal ply (40) in the container, and—forming the metal-ceramic substrate (1) by hot isostatic pressing.