Determination of the elastic modulus and hardness of sol-gel coatings on glass: influence of indenter geometry

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Abstract

Indentations have been carried out on methyltrimethoxysilane coated float glass by using a spherical and a Berkovich indenter. The composite hardness as well as the effective elastic modulus were determined as a function of indentation depth for coatings of a thickness 0.5, 2 and 4 µm. Using the Berkovich indenter, the coating exhibited radial cracking (only for the two thicker coatings), delamination and chipping, whereas no cracking occurred during indentations using a spherical indenter. For the experiments in which the coatings exhibited radial cracking, we measured a constant composite hardness over the whole depth range instead of the expected increase. The elastic modulus, on the other hand, turned out to be insensitive to the radial cracking. All results show the expected increase of the modulus with indentation depth. The spherical indenter showed a much steeper rise of the effective elastic modulus with indentation depth than the (sharp) Berkovich indenter. By re-scaling the results with respect to contact area instead of indentation depth, the Berkovich and the sphere elastic moduli are comparable. Only at the point where delamination occurred in the Berkovich indentations, the re-scaled results of the two indenter geometries start to deviate.
Original languageEnglish
Pages (from-to)134-143
Number of pages9
JournalThin Solid Films
Volume372
Issue number1-2
DOIs
Publication statusPublished - 2000

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indentation
Indentation
Sol-gels
modulus of elasticity
hardness
Elastic moduli
Hardness
gels
coatings
Glass
Coatings
Geometry
glass
geometry
Delamination
chipping
composite materials
floats
Composite materials
scaling

Cite this

@article{43247549ab3f4582b35a112872598176,
title = "Determination of the elastic modulus and hardness of sol-gel coatings on glass: influence of indenter geometry",
abstract = "Indentations have been carried out on methyltrimethoxysilane coated float glass by using a spherical and a Berkovich indenter. The composite hardness as well as the effective elastic modulus were determined as a function of indentation depth for coatings of a thickness 0.5, 2 and 4 µm. Using the Berkovich indenter, the coating exhibited radial cracking (only for the two thicker coatings), delamination and chipping, whereas no cracking occurred during indentations using a spherical indenter. For the experiments in which the coatings exhibited radial cracking, we measured a constant composite hardness over the whole depth range instead of the expected increase. The elastic modulus, on the other hand, turned out to be insensitive to the radial cracking. All results show the expected increase of the modulus with indentation depth. The spherical indenter showed a much steeper rise of the effective elastic modulus with indentation depth than the (sharp) Berkovich indenter. By re-scaling the results with respect to contact area instead of indentation depth, the Berkovich and the sphere elastic moduli are comparable. Only at the point where delamination occurred in the Berkovich indentations, the re-scaled results of the two indenter geometries start to deviate.",
author = "J. Malzbender and {With, de}, G. and {Toonder, den}, J.M.J.",
year = "2000",
doi = "10.1016/S0040-6090(00)01025-7",
language = "English",
volume = "372",
pages = "134--143",
journal = "Thin Solid Films",
issn = "0040-6090",
publisher = "Elsevier",
number = "1-2",

}

Determination of the elastic modulus and hardness of sol-gel coatings on glass: influence of indenter geometry. / Malzbender, J.; With, de, G.; Toonder, den, J.M.J.

In: Thin Solid Films, Vol. 372, No. 1-2, 2000, p. 134-143.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Determination of the elastic modulus and hardness of sol-gel coatings on glass: influence of indenter geometry

AU - Malzbender, J.

AU - With, de, G.

AU - Toonder, den, J.M.J.

PY - 2000

Y1 - 2000

N2 - Indentations have been carried out on methyltrimethoxysilane coated float glass by using a spherical and a Berkovich indenter. The composite hardness as well as the effective elastic modulus were determined as a function of indentation depth for coatings of a thickness 0.5, 2 and 4 µm. Using the Berkovich indenter, the coating exhibited radial cracking (only for the two thicker coatings), delamination and chipping, whereas no cracking occurred during indentations using a spherical indenter. For the experiments in which the coatings exhibited radial cracking, we measured a constant composite hardness over the whole depth range instead of the expected increase. The elastic modulus, on the other hand, turned out to be insensitive to the radial cracking. All results show the expected increase of the modulus with indentation depth. The spherical indenter showed a much steeper rise of the effective elastic modulus with indentation depth than the (sharp) Berkovich indenter. By re-scaling the results with respect to contact area instead of indentation depth, the Berkovich and the sphere elastic moduli are comparable. Only at the point where delamination occurred in the Berkovich indentations, the re-scaled results of the two indenter geometries start to deviate.

AB - Indentations have been carried out on methyltrimethoxysilane coated float glass by using a spherical and a Berkovich indenter. The composite hardness as well as the effective elastic modulus were determined as a function of indentation depth for coatings of a thickness 0.5, 2 and 4 µm. Using the Berkovich indenter, the coating exhibited radial cracking (only for the two thicker coatings), delamination and chipping, whereas no cracking occurred during indentations using a spherical indenter. For the experiments in which the coatings exhibited radial cracking, we measured a constant composite hardness over the whole depth range instead of the expected increase. The elastic modulus, on the other hand, turned out to be insensitive to the radial cracking. All results show the expected increase of the modulus with indentation depth. The spherical indenter showed a much steeper rise of the effective elastic modulus with indentation depth than the (sharp) Berkovich indenter. By re-scaling the results with respect to contact area instead of indentation depth, the Berkovich and the sphere elastic moduli are comparable. Only at the point where delamination occurred in the Berkovich indentations, the re-scaled results of the two indenter geometries start to deviate.

U2 - 10.1016/S0040-6090(00)01025-7

DO - 10.1016/S0040-6090(00)01025-7

M3 - Article

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EP - 143

JO - Thin Solid Films

JF - Thin Solid Films

SN - 0040-6090

IS - 1-2

ER -