Multi-Metallic Gun Barrel Cold Spray Liner
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Solution Overview
Problem
Gun barrels face high temperature issues during firing, leading to potential cook off, catastrophic failure, and premature wear, which necessitates frequent barrel changes and increased logistical burdens, while advanced additive manufacturing techniques have not been leveraged to produce barrels with advanced material properties.
Innovation Solution
A method involving cold spray deposition and wire arc additive manufacturing to create a multi-metallic gun barrel system with a liner, structural core, and outer jacket, using materials like cobalt superalloys, ceramics, and steel, with graded layers for strong bonding and thermal management, and a dissolvable mandrel for efficient production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional gun barrels are used, then manufacturing is simple, but thermal performance is poor leading to cook off and catastrophic failure
Solution Approach 1:
The patent applies composite materials by creating a multi-layered barrel structure consisting of a base metal layer and a ceramic coating layer. The ceramic layer (e.g., aluminum oxide, silicon carbide) provides superior thermal resistance and heat dissipation properties, while the metal base maintains structural integrity. This composite construction directly addresses the thermal performance limitation of traditional homogeneous metal barrels.
Solution Approach 2:
The manufacturing process segments the barrel production into distinct phases: applying ceramic slurry coats, drying, firing at controlled temperatures, and building up multiple layers. This segmentation allows precise control over thermal properties while managing manufacturing complexity through systematic, repeatable steps rather than attempting to solve the entire problem in one process.
2Reliability
If frequent barrel changes are implemented, then reliability is maintained, but logistics burden increases
Solution Approach 1:
The ceramic coating is applied in advance during the manufacturing process, creating a protective thermal barrier before the barrel enters service. This preliminary action of pre-coating eliminates the need for frequent barrel replacements due to thermal degradation, as the ceramic layer resists heat buildup and prevents cook-off, thereby maintaining reliability while reducing logistics burden.
Solution Approach 2:
The invention changes the thermal parameters of the barrel by introducing ceramic materials with high melting points and low thermal conductivity. This parameter change in material composition fundamentally alters the barrel's thermal behavior, allowing it to withstand higher temperatures for extended periods, thus extending service life and reducing replacement frequency.
3Strength
If advanced additive manufacturing techniques are used, then material properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by selectively applying ceramic coatings only to the inner bore surface and specific high-heat zones of the barrel, rather than uniformly treating the entire barrel. This localized approach optimizes material properties where they are most needed for thermal resistance while minimizing unnecessary complexity in low-stress areas, balancing performance improvement with manufacturing feasibility.
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 method enhances the thermal performance and lifespan of gun barrels, reducing the need for frequent replacements and logistical burdens by withstanding high temperatures and managing heat effectively, while maintaining structural integrity and bonding strength.
Implementation Method 1
applying to the mandrel via cold spray deposition a liner comprising a cobalt superalloy
Implementation Method 2
dissolving the mandrel in a chemical solution by circulating the chemical solution within an inner diameter of the mandrel
Implementation Method 3
heat treating the first coating and the second coating to diffusion bond the first coating and the second coating
Data Source
AI summary
A method for manufacturing a gun barrel with a cold spray process. The method includes the use of a mandrel having a tubular body and being made of a material with properties suited to use with gun barrel manufacture and materials and cold spray processes. The gun barrel includes a liner, one or more structural layers and an outer jacket. The mandrel is dissolved in a chemical process during manufacture of the gun barrel.