Nano- and Micro-Scale Impact Testing of Hard Coatings: A Review

Beake, Ben D.

doi:10.3390/coatings12060793

Cited by 20 publications

(9 citation statements)

References 149 publications

(378 reference statements)

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“…Conventional nano- and microimpact tests subject samples to sets of repeated high strain rate indentations by a typically sphero-conical probe at different applied loads from a constant accelerating distance while tracking probe depth. Since the inception of this testing modality, a variety of applications have been developed, including applications based on single-impact testing protocols . Unlike macroimpact tests, which assess impact response by post-test damage evaluations (e.g., crater volume), nano- and microimpact tests are generally geared for rapid, automated test batteries, which are evaluated using probe depth tracking alone .…”

Section: Resultsmentioning

confidence: 99%

“…Since the inception of this testing modality, a variety of applications have been developed, including applications based on single-impact testing protocols . Unlike macroimpact tests, which assess impact response by post-test damage evaluations (e.g., crater volume), nano- and microimpact tests are generally geared for rapid, automated test batteries, which are evaluated using probe depth tracking alone . Thin film response to high velocity impact is usually studied by laser-induced projectile impact testing, which uses laser ablation to fire microprojectiles with velocities ranging from 10 to 1000 m s –1 , and impact assessment of thin materials is of growing interest due to the inverse thickness dependence of impact resistance that occurs at very low thicknesses .…”

Section: Resultsmentioning

confidence: 99%

“…68 Unlike macroimpact tests, which assess impact response by post-test damage evaluations (e.g., crater volume), nano-and microimpact tests are generally geared for rapid, automated test batteries, which are evaluated using probe depth tracking alone. 68 Thin film response to high velocity impact is usually studied by laser-induced projectile impact testing, which uses laser ablation to fire microprojectiles with velocities ranging from 10 to 1000 m s −1 , 69 and impact assessment of thin materials is of growing interest due to the inverse thickness dependence of impact resistance that occurs at very low thicknesses. 70 These methods are excellent for their intended purpose of determining failure thresholds, but their equipment overhead is nontrivial; they require a large number of repetitions, and they require that the point of failure be reached or exceeded.…”

Section: Proof-of-concept Application To Impact Analysismentioning

confidence: 99%

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Pressure Indicator Composite Films via Compressive Deformation of a Translucent Matrix Containing a Contrasting Filler

Ammar,

Smith,

Aslan

et al. 2024

ACS Appl. Mater. Interfaces

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A neglected mechanism for pressure-responsive color change is demonstrated using cellulose acetate composites prepared by direct (solvent) immersion annealing (DIA), with different loadings of activated charcoal filler. Namely, compressive plastic deformation of the translucent cellulose acetate leads to a decrease in the optical path length and a concomitant increase in the visibility of the opaque contrasting filler. Composites bearing 1−7 wt% activated charcoal exhibited a linear relationship between applied pressure and resulting pressure mark brightness in the range of 12−56 MPa. Comparison of pressure mark patterns with cross-sectional scanning electron microscopy (SEM) supports the importance of the porous morphology arising from DIA for the tuning of the pressure indicator sensitivity. A simple ball drop test is used to illustrate the robustness and utility of these indicators in optical impact assessment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Proof-of-concept Application To Impact Analysismentioning

confidence: 99%

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Pressure Indicator Composite Films via Compressive Deformation of a Translucent Matrix Containing a Contrasting Filler

Ammar,

Smith,

Aslan

et al. 2024

ACS Appl. Mater. Interfaces

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“…In coating systems where intermittent high strain rate contact occurs, such as interrupted high-performance machining operations, impact resistance can be critical to serviceability. In the works [27,28], the principles of operation of the technique for carrying out nano-, micro-and macroscale impact tests of coatings are considered. The peculiarities of the determination of wear resistance in the conditions of field tests for abrasion and shock-abrasive wear and the measurement of hardness using indentation are considered in the publications [29,30].…”

Section: Introductionmentioning

confidence: 99%

Analytical Model of Deformation of a Functionally Graded Ceramic Coating under Local Load

Shatskyi,

Makoviichuk,

Ropyak

et al. 2023

Ceramics

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In this article, an analytical approach to the study of the behavior of functionally graded FG coatings under local load is developed. The method is suitable for coatings with a specific structure. We consider that the coating can be conditionally divided into two zones: a relatively rigid outer and a relatively compliant inner. The outer layer is modeled by a non-homogeneous plate that bends. We submit the inner substrate to the hypothesis of a non-homogeneous thin Winkler layer. The solution of the formulated boundary value problem is constructed in analytical form. Simulation examples for FG aluminum oxide coatings grown from aluminum sprayed on steel and from compact alloy D16T are considered. The distributions of equivalent stresses, safety factors and normalized equivalent stresses in the coatings are studied. It is noted that in a heterogeneous material, the location of the minimum of the safety factor does not always coincide with the location of the maximum of the equivalent stress.

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“…The use of cutting-edge nano structural hard coatings on tools and machine components can greatly extend their lifetime and reduce wear, according to a study published in the Journal of Coatings Technology and Research. The investigation came to the conclusion that there is huge potential for these coatings to be used in numerous industrial applications [26,27].…”

Section: Introductionmentioning

confidence: 99%

An Overview of Nano-structural Hard Coating Synthesis, Design, and Applications

K.G.¹,

Fernandes²

2023

Preprint

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Advanced Nano structural hard coatings are thin materials films that range in thickness from a few nanometers to a few micrometers and are applied to different surfaces to increase their hardness and wear resistance. Physical vapor deposition (PVD) or chemical vapor deposition (CVD) methods are frequently used to deposit these coatings. These coating’s distinctive characteristics result from their microstructure, which is made up of material columns or grains with a diameter of only a few nanometers. Increased hardness, higher wear resistance, and improved tribological properties result from these short dimensions. In applications with significant wear and/or high contact pressures, such as cutting tools, bearings, and engine parts, the usage of sophisticated Nano structural hard coatings is crucial. Advanced Nano structural hard coatings include, 1. Amorphous carbon coatings with high hardness, low friction, and exceptional wear resistance are known as diamond-like carbon (DLC) coatings. DLC coatings are frequently used in a variety of industries, including the automotive, aerospace, and biomedical ones. 2. Coatings made of titanium nitride (TiN): These metallic coatings have high hardness and wear resistance. Cutting tool, machining, and aerospace industries frequently use TiN coatings. 3. Chromium nitride (CrN) coatings: These coatings have great corrosion resistance, good wear resistance, and high hardness. Cutting tools, gears, and bearings are just a few of the objects that use CrN coatings. 4. Tungsten carbide (WC) coatings: These coatings, which have a high degree of hardness and wear resistance, are frequently employed in cutting tools and other applications that require wear resistance. Advanced Nano structural hard coatings provide many advantages over conventional coatings, including better hardness, increased wear resistance, and improved tribological qualities. The automotive, aerospace, and biomedical industries are just a few that could use these coatings. In this paper the author will explain about the design synthesis and applications of advanced Nano structural hard coating in aerospace and automotive applications.

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Nano- and Micro-Scale Impact Testing of Hard Coatings: A Review

Cited by 20 publications

References 149 publications

Pressure Indicator Composite Films via Compressive Deformation of a Translucent Matrix Containing a Contrasting Filler

Pressure Indicator Composite Films via Compressive Deformation of a Translucent Matrix Containing a Contrasting Filler

Analytical Model of Deformation of a Functionally Graded Ceramic Coating under Local Load

An Overview of Nano-structural Hard Coating Synthesis, Design, and Applications

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