Erosion Resistant Torch Nozzle for Solid Free Form Fabrication
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Solution Overview
Problem
Solid free-form fabrication processes, particularly ion fusion formation and direct metal deposition, face challenges in achieving high deposition rates while maintaining nozzle integrity and deposition accuracy due to the erosion of torch nozzles caused by high heat and gas flow, leading to reduced nozzle life and coarser deposition.
Innovation Solution
The development of an erosion-resistant torch nozzle with a refractory material coating, such as rhenium, applied to a copper substrate, combined with a bonding material like nickel to enhance adhesion and conductivity, which reduces material erosion and maintains heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high heat is generated by increasing gas flow velocity through the torch nozzle, then deposition rate is improved, but nozzle erosion increases and nozzle life decreases
Solution Approach 1:
The torch nozzle is constructed as a composite structure with a copper substrate providing thermal conductivity and a refractory material coating (such as rhenium, tungsten, or molybdenum) providing erosion resistance. This composite design allows the nozzle to withstand both the thermal demands for high deposition rates and the mechanical erosion from high-velocity gas flow, thereby extending nozzle life while maintaining productivity.
2Productivity
If a larger nozzle orifice is used to increase gas flow and heat generation, then deposition rate is improved, but deposition accuracy deteriorates due to coarser deposition
Solution Approach 1:
The invention changes the material parameters of the nozzle by applying a refractory coating with different thermal and mechanical properties than the copper substrate. This allows the nozzle to maintain a smaller orifice size for accurate deposition while still permitting high gas flow rates through the refractory material's ability to withstand the thermal and mechanical stresses, thus achieving both high deposition rates and fine deposition accuracy.
3Use of energy by moving object
If copper is used as the nozzle material for high heat conductivity, then heat transfer efficiency is improved, but erosion resistance deteriorates due to low melting temperature
Solution Approach 1:
The torch nozzle employs a composite material structure where a copper substrate provides excellent thermal conductivity for efficient heat transfer to the workpiece, while a refractory material coating (such as rhenium, tungsten, or molybdenum) applied to the inner surface provides high-temperature erosion resistance. This composite design allows the nozzle to operate at high temperatures with high-velocity gas flow without eroding, while maintaining efficient heat transfer to the deposition zone.
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 erosion-resistant torch nozzle extends the life of the nozzle by minimizing material loss and maintaining high heat conductivity, allowing for higher deposition rates with improved accuracy and reduced fusion zone width, thus lowering the cost and complexity of the final product.
Implementation Method 1
erosion of the nozzle orifice will occur... To prolong the life of the torch nozzle, the orifice must be kept cool and resistant to heat
Implementation Method 2
copper substrate... maintaining heat transfer efficiency
Implementation Method 3
bonding material like nickel to enhance adhesion and conductivity
Implementation Method 4
arc electrode... high heat is required... high heat is generated by an increase in gas flow
Data Source
AI summary
An erosion resistant torch for use in a solid free form fabrication system for manufacturing a component from successive layers of metal feedstock material. The erosion resistant torch includes a torch structure defining a torch nozzle formed of a highly conductive bulk material. The erosion resistant torch further includes a gas flow channel and an orifice defined therein. An arc electrode is disposed within the gas flow channel. An erosion resistant material is disposed between the torch nozzle and the arc electrode in the form of a coating layer or an erosion resistant insert. The erosion resistant material is formed of one of a refractory material or a ceramic material.