Cold Spray Nozzle Design for Nitrogen-Based Chromium Cladding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The current cold spray system design limits the use of nitrogen as a carrier gas, resulting in restricted nozzle traverse velocity and higher costs for producing chromium-coated cladding, which is essential for accident-tolerant fuel production, as helium is expensive and scarce.
Innovation Solution
A multiple nozzle design in a cold spray system that allows for three-dimensional arrangement of nozzles, enabling increased nozzle traverse velocity and efficient application of a high-quality chromium layer using nitrogen, thereby reducing costs and improving production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nitrogen is used as carrier gas instead of helium, then cost is reduced and availability is improved, but nozzle traverse velocity is limited and coating quality may deteriorate
Solution Approach 1:
The system divides the coating function into multiple nozzles (first nozzle for pre-heating, second nozzle for coating application) working in sequence, allowing each nozzle to be optimized for its specific function while maintaining overall system performance with nitrogen carrier gas
Solution Approach 2:
The first nozzle performs pre-heating of the substrate before the second nozzle applies the coating, preparing the substrate surface in advance to enable better coating adhesion and quality when using nitrogen carrier gas
2Productivity
If single nozzle design is used, then system complexity is low, but productivity is limited and coating quality cannot be optimized
Solution Approach 1:
The coating system is segmented into multiple nozzles with distinct functions (pre-heating nozzle and coating nozzle), enabling parallel operations that increase productivity while maintaining manageable system complexity through functional specialization
Solution Approach 2:
Multiple nozzle functions (pre-heating and coating application) are merged into a single integrated system that processes the substrate continuously, improving production rate without proportionally increasing system complexity
3Ease of manufacture
If nitrogen is used as carrier gas, then cost is reduced, but coating bonding strength and hermeticity may deteriorate
Solution Approach 1:
The first nozzle pre-heats the substrate before coating application, creating optimal surface conditions that enhance bonding strength and hermeticity when using nitrogen carrier gas
Solution Approach 2:
The system controls and optimizes parameters such as pre-heating temperature, carrier gas pressure, and nozzle traverse velocity to ensure high bonding strength and hermeticity of the chromium coating when using nitrogen instead of helium
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 system achieves higher production rates and improved coating quality with increased bonding strength and hermeticity, allowing for cost-effective production of chromium-coated claddings using nitrogen instead of helium, while maintaining or enhancing performance in both normal and accident conditions.
Implementation Method 1
The cold spray system is configured to pre-heat the substrate before application of the at least a portion of the metallic coating to the substrate
Implementation Method 2
Cold Spray deposition is an excellent method for coating a chromium (Cr) layer on a base Zr-alloy fuel cladding
Data Source
AI summary
Disclosed herein is a cold spray system. The cold spray system comprises a nozzle unit comprising a coating nozzle member, configured to apply at least a portion of a metallic coating to a substrate. The cold spray system is configured to pre-heat the substrate before application of the at least a portion of the metallic coating to the substrate. Also disclosed herein is a method for applying a coating via a cold spray technique.