Adhesion of PVD Coatings on Surface of Small Arm

Joska, Zdeněk; Rak, Luděk; Daniel, Josef; Horníček, Jakub; Triska, Vaclav; Nguyen, Chien Huu

doi:10.1149/09901.0265ecst

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…These substitutes include, for example, the deposition of hard, abrasionresistant coatings using PVD (Physical Vapor Deposition) and CVD (Chemical Vapor Deposition) technologies. For example, the application of PVD coatings based on FeinAl (designation of the AlCrN coating) showed that the application of this coating to the gas piston did not lead to its visible wear even after 3,000 shots [17]. However, it should be added that the FeinAl coating was applied to the original hard chrome coating.…”

Section: Introductionmentioning

confidence: 99%

Possibilities of Using the Duplex System Plasma Nitriding + CrN Coating for Special Components

Dobrocký¹,

Pokorny²,

Joska³

et al. 2022

Preprint

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The purpose of material selection and surface treatment for a given component is to assure the weapon's failure-free and dependable operation throughout its life time. At the same time, the material and surface technology chosen must take into account the chosen manufacturing method in terms of material attributes, as well as the economics and ecology of production. A gas piston is one of the most visible parts of high-performance small weapons (automatic rifles) that provides its own drive (automation of the functional cycle). The pressure and temperature of the propellant gases, as well as dynamic shocks and wear, put a lot of strain on the gas piston, which puts a lot of strain on the piston material. Steel C55, 80Mn4, 31NiCr14, 42CrMo4, X30Cr13, and X30WCrV9.3 are the most common materials for gas pistons, which are hard chrome plated. Hard chromium plating, which is extremely damaging to the environment and human health, is currently being replaced by PVD or CVD methods. PVD coating deposition processes, for example, have shown to be viable options. Surface treatments including the application of layers and subsequent deposition of coatings are one option (duplex system). The article discusses the use of CrN coating to replace hard chromium plating and the duplex system plasma nitriding + CrN coating (hence PN + CrN). For testing, 42CrMo4 steel was chosen. The strong chrome coating as well as the CrN coating itself were compared to the PN + CrN duplex system. The mechanical and tribological properties, as well as the shape and texture of the surface, were all examined. For exposed sections of small weapons, the PN + CrN duplex system has proven to be a viable alternative to hard chrome coating.

show abstract

Section: Introductionmentioning

confidence: 99%

Possibilities of Using the Duplex System Plasma Nitriding + CrN Coating for Special Components

Dobrocký¹,

Pokorny²,

Joska³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…These substitutes include, for example, the deposition of hard, abrasion-resistant coatings using PVD (Physical Vapor Deposition) and CVD (Chemical Vapor Deposition) technologies. For example, the application of PVD coatings based on FeinAl (designation of the AlCrN coating) showed that the application of this coating to the gas piston did not lead to its visible wear even after 3000 shots [10]. However, it should be noted that the FeinAl coating was applied to the original hard chrome coating.…”

mentioning

confidence: 99%

Possibilities of Using the Duplex System Plasma Nitriding + CrN Coating for Special Components

et al. 2022

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The article deals with the replacement of hard chrome plating by applying the duplex system plasma nitriding + CrN coating (hereinafter referred to as PN + CrN). The goal of the research was to find a suitable alternative for steel surface treatment that would replace hard chrome plating and ensure similar mechanical and tribological properties. An exposed part of a small-bore weapon was selected for evaluation, namely the gas piston of the 42CrMo4 steel breech mechanism drive. The PN + CrN duplex system was compared with a hard chrome coating as well as a self-deposited CrN coating. The mentioned surface treatments were evaluated in terms of metallography, mechanical and tribological properties and surface texture. From the mechanical properties, the hardness of the surface was analyzed, an indentation test was performed (Mercedes test) and adhesive-cohesive behavior was evaluated (Scratch test). Furthermore, an instrumented penetration test was performed (an evaluation of plastic and elastic deformation work and indentation hardness). As part of the assessment of tribological properties, the Ball-on-Flat test, the measurement of the coefficient of friction and the measurement of traces of wear were performed. The surface texture was evaluated in terms of morphology and surface roughness measurement by selected 2D and 3D parameters. The PN + CrN duplex system showed higher hardness than hard chrome, better tribological properties (lower friction coefficient), but worse surface texture. The PN + CrN duplex system has proven to be a suitable alternative to the hard chrome coating for exposed parts of small-caliber weapons, which can be applied in arms production.

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Adhesion of PVD Coatings on Surface of Small Arm

Cited by 2 publications

References 9 publications

Possibilities of Using the Duplex System Plasma Nitriding + CrN Coating for Special Components

Possibilities of Using the Duplex System Plasma Nitriding + CrN Coating for Special Components

Possibilities of Using the Duplex System Plasma Nitriding + CrN Coating for Special Components

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