Diamond-Like Carbon Coating for Lubricant-Free Firing Weapons
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Solution Overview
Problem
Conventional liquid lubricants in firing weapons degrade in extreme environments, leading to reliability issues, excessive wear, and maintenance challenges due to increased viscosity in cold temperatures and dust accumulation in desert environments, and existing low-friction coatings fail to meet stringent military requirements for wear resistance, friction coefficient, corrosion resistance, and anti-fouling behavior.
Innovation Solution
A solid diamond-like carbon (DLC) coating with 80%-60% carbon and 20%-40% hydrogen, bonded to the metallic surfaces of firing weapon components, combined with 0-90 degree angled channels on bolt carrier rails, and an optional adhesive interlayer, applied using plasma enhanced chemical vapor deposition, to provide a lubrication-free operation with enhanced wear resistance, low friction, corrosion resistance, and anti-fouling behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid lubricants are used in extreme cold environments, then the weapon components are protected from wear, but the lubricant viscosity increases which deteriorates weapon function
Solution Approach 1:
The invention changes the physical state parameter of the lubricant from liquid to solid (diamond-like carbon coating). This solid coating maintains its lubricating properties across extreme temperature ranges without the viscosity changes that plague liquid lubricants in cold environments.
Solution Approach 2:
The invention uses a composite structure consisting of diamond-like carbon coating applied over a metallic substrate (steel, aluminum, or titanium). This composite material combines the wear resistance and low friction of DLC with the structural strength of the metal substrate, achieving reliable operation in extreme temperatures.
2Reliability
If conventional liquid lubricants are used in desert environments, then the weapon components are protected from wear, but the lubricants attract and accumulate dust which leads to weapon jamming and stoppages
Solution Approach 1:
The invention extracts and eliminates the liquid lubricant component that attracts dust. By replacing it with a solid diamond-like carbon coating, the system removes the source of dust accumulation while maintaining wear protection and low friction properties.
Solution Approach 2:
The DLC coating creates a durable, maintenance-free surface that does not require periodic re-lubrication. Unlike liquid lubricants that degrade and attract dust over time, the solid coating provides long-lasting protection without accumulating contaminants.
3Force
If low-friction coatings are applied to weapon components, then the coefficient of friction is reduced, but the wear resistance is insufficient to last the life of the weapon part
Solution Approach 1:
The invention uses diamond-like carbon, a composite material that combines the low friction properties of graphite-like structures with the hardness and wear resistance of diamond. This unique composite structure provides both low coefficient of friction and durability lasting the weapon's service life.
Solution Approach 2:
The invention changes the material parameters by applying a DLC coating with specific properties: hardness of 8-20 GPa and coefficient of friction of 0.05-0.20. These parameter optimizations ensure both low friction and long-term wear resistance.
4Force
If liquid lubrication is used in weapon systems, then the friction is reduced, but corrosion resistance deteriorates over the life of the part
Solution Approach 1:
The invention removes the liquid lubricant that compromises corrosion resistance. The solid diamond-like carbon coating provides a protective barrier that prevents corrosive environments from attacking the metal substrate, eliminating the corrosion problem associated with liquid lubrication.
5Reliability
If the bolt carrier rails are modified with surface channels, then dust and grit are expelled from critical sliding points, but the device complexity increases
Solution Approach 1:
The invention applies local quality modification by adding surface channels only to the bolt carrier rails where dust accumulation occurs, while leaving other components unchanged. This localized approach provides anti-fouling benefits with minimal impact on overall device complexity.
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 DLC coating enables reliable operation in extreme temperatures (-65° F to 750° F) without lubrication, reducing jamming, increasing fatigue life, protecting against corrosion, and improving maintainability by eliminating hydrogen embrittlement and promoting easy cleaning, while maintaining consistent cyclic rates and reducing wear and corrosion.
Implementation Method 1
The process utilizes plasma enhanced chemical vapor deposition to bond the carbon, hydrogen, and optionally dopant atoms onto the metallic surfaces of the firing weapon
Data Source
AI summary
A lubricant free firing weapon is provided having amorphous, solid, diamond-like carbon coating (DLC) containing sp3, sp2 carbons and hydrogen bonded to the metallic operating parts. Such firing weapons may further include physical modifications to the bolt carrier rails to enhance the expulsion of sand/dust on the bolt carrier under extreme environments. Also provided herein are plasma enhanced chemical vapor deposition processes for producing such lubricant free weapons having coat thicknesses of 1 μm-25 μm which allows for reliable operation under all environmental conditions including extreme environments such as hot/cold and sand/dust without the need for lubrication.