Hardness of coatings

Iost, Alain; Bigot, Régis

doi:10.1016/0257-8972(95)02697-5

Cited by 77 publications

(47 citation statements)

References 15 publications

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“…(3)) for the coating and the substrate in the composite hardness calculation. We proposed a second improvement [12] by taking into consideration all terms in Eq. (2) (producing Eq.…”

Section: The Jönsson and Hogmark Model [3] (Jh)mentioning

confidence: 99%

A comparison of models for predicting the true hardness of thin films

et al. 2012

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“…(3)) for the coating and the substrate in the composite hardness calculation. We proposed a second improvement [12] by taking into consideration all terms in Eq. (2) (producing Eq.…”

Section: The Jönsson and Hogmark Model [3] (Jh)mentioning

confidence: 99%

A comparison of models for predicting the true hardness of thin films

et al. 2012

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“…Iost and Bigot [19] consider the relation (4) without the Jönsson and Hogmark simplifications. Taking into account the second-and third-order 1/d terms, composite hardness can be expressed using the following expansions: A mathematic analysis shows that the form of equation (5) depends on the product of = (H 0f -H 0s )/ (B f -B S ) and kt.…”

Section: Resultsmentioning

confidence: 99%

Hardness Evaluation of Porous Hydroxyapatite Coating

Behnamghader

Farsadzadeh²,

Najjar

et al. 2007

3rd Kuala Lumpur International Conference on Biomedical Engineering 2006

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract--The extensive use of appropriate coatings to improve wear resistance, friction coefficient, electrical properties, corrosion resistance and biomedical application has stimulated a growing interest in their mechanical properties and especially hardness testing that is routinely used for coating evaluation. In this study Jönsson and Hogmark model is applied for the porous hydroxyapatite produced by plasma spraying on Ti6A14V substrate. Firstly, the effect of indentation load on hardness values of coating and substrate are studied. The modified Jönsson and Hogmark model is used to explain the composite hardness behavior and the effect of coating porosity.

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“…Il est généralement démontré dans la littérature que ce modèle n'est pas le meilleurà cause de la définition du paramètre a qui peut atteindre des valeurs supérieuresà 1 pour de faibles profondeurs d'indentation, provenant de l'importance donnée au paramètre C. En effet, si a > 1, l'aire de contact entre l'indenteur et le revêtement est négative, ce qui est physiquement impossible. Ainsi comme le spécifient Iost et Bigot [18] ou encore Guillemot et al [19,20], l'application de ce modèle dans le cas de la détermination de la dureté composite en fonction de la profondeur d'indentation nécessite quelques précautions, comme la valeur de a qui doitêtre restreinte dans l'intervalle 0 ≤ a ≤ 1. Ainsi, l'Équation (2) peutêtre appliquée si h ≥ C, cette condition délimite la valeur de pénétration pour laquelle le revêtement influence la mesure de la dureté.…”

Section: Dureté Du Filmunclassified

Propriétés mécaniques par indentation d’un film mince nanometrique de nitrure d’aluminium

Roudet¹,

Chicot²,

Decoopman³

et al. 2015

Matériaux & Techniques

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Résumé -Les propriétés mécaniques des films minces sont généralement déterminées par nanoindentation pouréviter l'influence du substrat. En effet, nous savons que le substrat influence cette mesure dès lors que l'indenteur pénètreà plus de 10 % de l'épaisseur du film pour la dureté, ce chiffre pouvantêtre ramenéà 1 % pour le module d'élasticité. Pour des films extrêmement minces pour lesquels la mesure directe des propriétés ne serait pas possible, l'application de modèles pour séparer la contribution du substrat de la mesure est alors nécessaire. Mots clés : Film mince / nanoindentation / modèle analytique / nitrure d'aluminiumAbstract -Mechanical properties by indentation of aluminium nitride nanometric thin film. The mechanical properties of thin film are usually determined by nanoindentation in order to circumvent the influence of the substrate. Indeed, it is recognized that the substrate interferes into the measurement when the indenter penetrates more than 10% of the film thickness for the hardness determination and 1% for the elastic modulus determination. For very thin films for which a direct measurement of the mechanical properties is not possible, models must be applied to separate the contribution of the substrate into the measurement. In this work, hardness and elastic modulus of aluminum nitride film of 250 nm of thickness deposited by Magnetron Sputtering have been determined by nanoindentation. In order to reduce the influence of the uncertainty of the film thickness value on the mechanical property determination, we suggest to introduce the thickness term into the fitting parameters of the different models and to study the convergence of these models. Concerning the elastic modulus, we observed that the experimental data varied following a typical S-curve between tow asymptotes, one which tends toward the value of the film modulus for very low indenter displacements and the other toward that of the substrate for the highest indentation loads. In these conditions, the model proposed by Antunes et al.

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Hardness of coatings

Cited by 77 publications

References 15 publications

A comparison of models for predicting the true hardness of thin films

A comparison of models for predicting the true hardness of thin films

Hardness Evaluation of Porous Hydroxyapatite Coating

Propriétés mécaniques par indentation d’un film mince nanometrique de nitrure d’aluminium

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