PVD Multilayer Metal Structure With Orthogonal Grain-Bond Orientation
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Solution Overview
Problem
Conventional metal forming processes, such as rolling and extrusion, struggle to produce multi-layer metal structures with bond or interface regions oriented orthogonally to the grain structure, leading to unpredictable mechanical properties and increased contamination, particularly in smaller products like wires, tubes, and foils, which affect fatigue resistance and corrosion resistance.
Innovation Solution
Employing physical vapor deposition (PVD) to create multi-layer metal materials with controlled crystal grain orientations orthogonal to the interface bond regions, allowing for tailored mechanical properties and reduced contamination by controlling process parameters like vacuum chamber pressure, plasma power, and substrate bias.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional metal forming processes (rolling and extrusion) are used to produce multi-layer metal structures, then the manufacturing process is simple and well-established, but the bond or interface regions cannot be oriented orthogonally to the grain structure, resulting in unpredictable mechanical properties and increased contamination
Solution Approach 1:
The patent replaces conventional mechanical metal forming processes (rolling and extrusion) with physical vapor deposition (PVD). This substitution enables precise control over crystal grain orientation and multi-layer structure formation without the limitations of mechanical processes. The PVD process deposits metal vapor onto a substrate, allowing orthogonal orientation of bond regions relative to grain structure, which cannot be achieved through mechanical forming.
Solution Approach 2:
The patent utilizes changes in physical parameters during the PVD process, specifically controlling vacuum chamber pressure, plasma power, and substrate bias voltage. These parameter changes enable precise control over deposition conditions, resulting in controlled crystal grain orientations and well-defined interface regions. By adjusting these parameters, the process achieves orthogonal grain orientation relative to bond regions while maintaining manufacturing feasibility.
2Reliability
If conventional metal forming processes are used, then production is easier, but contamination increases particularly in smaller products like wires, tubes, and foils, affecting fatigue resistance and corrosion resistance
Solution Approach 1:
The patent employs a vacuum environment during the PVD process, which is inherently free from atmospheric contamination. The vacuum chamber isolates the deposition process from air, preventing oxidation and other harmful reactions that occur during conventional metal forming. This inert environment ensures ultra-clean material deposition, eliminating contamination issues that plague smaller products like wires, tubes, and foils produced by conventional methods.
Solution Approach 2:
By replacing mechanical forming processes with PVD, the patent eliminates the mechanical contact and associated contamination sources (lubricants, tooling residues, surface scratches) that occur during rolling and extrusion. The vapor-phase deposition leaves no mechanical contaminants, resulting in superior fatigue and corrosion resistance.
3Manufacturing precision
If PVD process is used to create multi-layer materials with controlled grain orientations, then manufacturing precision and material properties are improved, but the process complexity and equipment requirements increase
Solution Approach 1:
The patent controls the complex PVD process by systematically adjusting key parameters: vacuum chamber pressure, plasma power, and substrate bias voltage. These parameter changes enable precise control over grain orientation and layer formation. By focusing control efforts on these critical parameters rather than attempting to manage all process variables, the patent achieves high manufacturing precision while keeping the control system manageable.
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 PVD process results in multi-layer materials with improved mechanical properties, including transverse isotropy and radial anisotropy, enhancing fatigue resistance and corrosion resistance, while minimizing contaminant inclusions, suitable for high-precision applications like medical devices.
Implementation Method 1
PVD generally refers to a process in which a metal vapor is generated from a solid metal target, and the metal vapor is then deposited on an substrate material
Implementation Method 2
a plasma is created around the substrate that bombards the solid metal target to dislodge metal atoms from the solid metal target into the metal vapor
Implementation Method 3
the metal vapor is then deposited on an substrate material as a highly coherent pure or alloy metal
Data Source
AI summary
Multi-layer metal or pseudometallic materials having engineered anisotropy are disclosed. The multi-layer materials having defined engineered grain orientations in each layer of the multi-layer material and bond layers between adjacent layers orthogonal to the grain orientations. This configuration distributes applied stress across the plurality of layers in the multi-layer metal material and around a neutral axis of the multi-layer metal material and increases the overall mechanical properties of the disclosed multi-layer metal material relative to conventional wrought metal materials of the same or similar chemical constitution. The microstructure of each layer, group of layers, or across multiple layers may be tailored to the intended application of a device made from the material. Individual layers may be tuned for property variations, such as gradients, or to adjust the bond layer characteristics. A method of making the multi-layer metal materials by physical vapor deposition to deposit each layer as crystalline grain structures and allow for layer-by-layer control over the physical, mechanical and chemical properties of each layer in the multi-layer metal as well as a bond layer between adjacent layers is disclosed.