Cold Spray Deposition with Laser Temperature Feedback
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Solution Overview
Problem
Existing cold spray deposition techniques face challenges in achieving consistent deposition on complex geometries and large parts due to limitations in varying deposition parameters, leading to inconsistent adhesion, microstructure, and efficiency, particularly in additive manufacturing.
Innovation Solution
A feedback-controlled cold spray deposition process using a pulsed laser and remote instantaneous temperature sensors to monitor and adjust the surface temperature in real-time, allowing for precise control of deposition parameters such as adhesion, cohesion, density, and microstructure, enabling deposition on complex substrates with improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant deposition parameters are used throughout the tool path, then the process is simple to control, but deposition consistency deteriorates on complex geometries and large parts
Solution Approach 1:
The patent implements dynamic adjustment of deposition parameters during the tool path execution. The system continuously monitors process conditions and automatically modifies parameters such as powder feed rate, gas flow rate, and laser power to maintain optimal deposition characteristics throughout the entire process, transitioning from static to dynamic control to address geometric variations
Solution Approach 2:
The patent incorporates real-time feedback mechanisms where sensors monitor deposition quality and process conditions, and this information is fed back to the control system. The control system then adjusts deposition parameters based on actual measurements, creating a closed-loop control system that maintains consistent deposition despite changes in substrate geometry or environmental conditions
2Manufacturing precision
If deposition parameters are varied to improve deposition properties, then deposition quality improves, but process complexity increases
Solution Approach 1:
The patent systematically varies multiple deposition parameters including powder feed rate, gas composition, gas pressure, laser power, and scan speed in a coordinated manner. The control system manages these parameter changes through integrated control algorithms that adjust parameters based on real-time process monitoring, maintaining deposition quality while managing the complexity of multi-parameter optimization
3Reliability
If more passes are used to deposit complex structures, then deposition completeness improves, but productivity decreases
Solution Approach 1:
The patent applies preliminary laser heating to the substrate surface before cold spray deposition to enhance particle deformation and adhesion. This pre-treatment enables better deposition properties to be achieved in fewer passes, as the heated surface prepares the substrate to receive and bond particles more effectively, reducing the total number of required passes while maintaining completeness
Solution Approach 2:
The patent employs periodic laser heating cycles interspersed with deposition passes. The laser is activated in periodic intervals to heat specific zones of the substrate, creating optimal conditions for particle deformation and bonding. This periodic thermal treatment enhances deposition efficiency and can reduce the total number of passes needed compared to continuous deposition without thermal assistance
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 enhances deposition consistency and efficiency by allowing for a wider range of acceptable deposition parameters, reducing the number of passes required, and improving the quality of additively manufactured parts by maintaining optimal surface temperatures during the deposition process.
Implementation Method 1
a laser to selectively heat the surface near or overlapping the jet
Implementation Method 2
a remote instantaneous temperature sensor (RITS) to sense a temperature of the surface at at least one first point near the jet, but not overlapping the jet or the laser
Implementation Method 3
CS is a method of depositing (usually metallic or ceramic-metallic composite) materials by accelerating solid powders in a supersonic gas jet and propelling the jet towards a substrate
Implementation Method 4
During impact with the substrate (or previously deposited layer), particles undergo plastic deformation and adhere to the surface to build-up a bead
Data Source
AI summary
A technique for improving cold spray deposition conditions for cold spray additive manufacture of parts involves providing an in-situ temperature feedback controller with a remote instantaneous temperature sensor supplying surface temperature measurements of the deposition surface, and a (preferably long pulse) laser for heating. Temperature feedback allows for control over deposition conditions yielding predictable deposition properties.