Free Moving Anvil Densification of Superconducting Wire
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Solution Overview
Problem
Existing devices for high-pressure densification of superconducting wires, such as those using hard metal anvils, face limitations in achieving uniform pressure over long wire lengths and suffer from wall friction, leading to reduced anvil lifetime and inconsistent critical current density enhancements beyond 3 GPa.
Innovation Solution
Incorporating a free-moving anvil with clearances to minimize friction and using independent hydraulic presses to maintain constant pressure, allowing for simultaneous high-pressure application by all anvils without wall contact, and optimizing anvil geometry to reduce stress concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hard metal anvils are used for high-pressure densification, then critical current density enhancement is achieved, but wall friction reduces anvil lifetime and causes pressure non-uniformity
Solution Approach 1:
The patent extracts the harmful frictional contact between anvils by introducing clearances (0.01-0.2 mm) between the free-moving anvil and fixed anvils. This separation eliminates wall friction while maintaining pressure transmission, resolving the contradiction between achieving densification and preserving anvil lifetime.
Solution Approach 2:
The free-moving anvil acts as an intermediary element that transmits pressure from hydraulic presses to the superconducting wire without direct contact with fixed anvils. The clearances allow this intermediary to move freely and apply pressure uniformly without frictional losses to fixed components.
2Manufacturing precision
If high pressure is applied to enhance critical current density, then mass density increases, but pressure non-uniformity occurs beyond 3 GPa due to friction
Solution Approach 1:
The patent makes the anvil system dynamic by allowing one anvil to move freely under hydraulic pressure while maintaining clearances against fixed anvils. This dynamic configuration enables uniform pressure application at high pressures (above 3 GPa) without the non-uniformity caused by static friction in traditional fixed-anvil systems.
Solution Approach 2:
By removing the frictional constraint through clearances, the system can apply high pressures uniformly along the wire length. The free-moving anvil extracts the harmful friction effect while maintaining the necessary pressure transmission function.
3Stability of the object's composition
If fixed anvils are used for pressure application, then structural stability is maintained, but friction reduces effectiveness at high pressures
Solution Approach 1:
The anvil system is segmented into fixed anvils (providing structural stability) and a free-moving anvil (providing friction-free pressure application). This segmentation allows each component to fulfill its optimal function: fixed anvils maintain system stability while the free-moving anvil ensures effective pressure transmission.
Solution Approach 2:
Different parts of the anvil system have different properties: fixed anvils provide structural support while the free-moving anvil provides friction-free pressure application. The clearances create a local quality difference that optimizes both stability and effectiveness simultaneously.
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 enhanced critical current densities at lower pressures, extends anvil lifetime, and ensures consistent pressure application over long wire lengths, achieving significant enhancements in mass density and critical current density without the limitations of previous methods.
Implementation Method 1
said hard metal anvils relied to external independent pressure blocks, which are in turn either fixed or connected to high pressure devices, preferably hydraulic presses
Implementation Method 2
device for the high pressure densification of superconducting wire
Data Source
AI summary
A device for the high pressure densification of superconducting wire from compacted superconductor material or superconductor precursor powder particles, has four hard metal anvils (5, 6, 7, 8) with a total length (L2) parallel to the superconducting wire, the hard metal anvils borne in external independent pressure blocks (9, 10, 11), which are in turn either fixed or connected to high pressure devices, preferably hydraulic presses. At least one of the hard metal anvils is a free moving anvil (6) having clearances of at least 0.01 mm up to 0.2 mm towards the neighboring hard metal anvils (5, 8), so that no wall friction occurs between the free moving anvil and the neighboring anvils. This allows for high critical current densities Jc at reduced pressure applied to the hard metal anvils.