Indentation Properties of Copper Leadframe with Hard Coatings

Do Hyung Kim; Jang Kyo Kim; Man Lung Sham; Pyung Hwang

doi:10.1007/BF03026404

Indentation Properties of Copper Leadframe with Hard Coatings

Do Hyung Kim, Jang Kyo Kim, Man Lung Sham, Pyung Hwang

Mechanical & Nuclear Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Hardness and elastic modulus of a typical leadframe material which consists of a Cu alloy substrate with Ni and Pd bi-layer coatings were characterised using Vicker's micro-hardness and nano-indentation tests. The two different testing methods produced similar results in that 'composite' hardness for all coated specimens decreased (except at very low loads in the nano-indentation test) with increasing indentation depth and tended to converge at sufficiently high loads due to the strong influence of the coating/substrate interaction. The hardness values of substrate and Ni and Pd coatings were successfully determined from the 'composite' hardness values based on the empirical linear relationship with the inverse of indentation diagonal and the rule of mixtures principle.

Original language	British English
Pages (from-to)	812-817
Number of pages	6
Journal	Metals and Materials International
Volume	4
Issue number	4
DOIs	https://doi.org/10.1007/BF03026404
State	Published - 1998

Keywords

bi-layer coating
Coating-substrate interaction
Composite hardness
Nano-indentation
Vicker's hardness test

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10.1007/BF03026404

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@article{518492a89dac4c51a566d906201c4110,

title = "Indentation Properties of Copper Leadframe with Hard Coatings",

abstract = "Hardness and elastic modulus of a typical leadframe material which consists of a Cu alloy substrate with Ni and Pd bi-layer coatings were characterised using Vicker's micro-hardness and nano-indentation tests. The two different testing methods produced similar results in that 'composite' hardness for all coated specimens decreased (except at very low loads in the nano-indentation test) with increasing indentation depth and tended to converge at sufficiently high loads due to the strong influence of the coating/substrate interaction. The hardness values of substrate and Ni and Pd coatings were successfully determined from the 'composite' hardness values based on the empirical linear relationship with the inverse of indentation diagonal and the rule of mixtures principle.",

keywords = "bi-layer coating, Coating-substrate interaction, Composite hardness, Nano-indentation, Vicker's hardness test",

author = "Kim, {Do Hyung} and Kim, {Jang Kyo} and Sham, {Man Lung} and Pyung Hwang",

note = "Funding Information: (RGC) for continuing support of this work. JKK is grateful to QPL Limited, Hong Kong for the supply of materials. DHK was a visiting scholar from Yeungnam University, Korea to Hong Kong University of Science & Technology. Hong Kong when this work was t~,~rformed.",

year = "1998",

doi = "10.1007/BF03026404",

language = "British English",

volume = "4",

pages = "812--817",

journal = "Metals and Materials International",

issn = "1225-9438",

publisher = "Korean Institute of Metals and Materials",

number = "4",

}

TY - JOUR

T1 - Indentation Properties of Copper Leadframe with Hard Coatings

AU - Kim, Do Hyung

AU - Kim, Jang Kyo

AU - Sham, Man Lung

AU - Hwang, Pyung

N1 - Funding Information: (RGC) for continuing support of this work. JKK is grateful to QPL Limited, Hong Kong for the supply of materials. DHK was a visiting scholar from Yeungnam University, Korea to Hong Kong University of Science & Technology. Hong Kong when this work was t~,~rformed.

PY - 1998

Y1 - 1998

N2 - Hardness and elastic modulus of a typical leadframe material which consists of a Cu alloy substrate with Ni and Pd bi-layer coatings were characterised using Vicker's micro-hardness and nano-indentation tests. The two different testing methods produced similar results in that 'composite' hardness for all coated specimens decreased (except at very low loads in the nano-indentation test) with increasing indentation depth and tended to converge at sufficiently high loads due to the strong influence of the coating/substrate interaction. The hardness values of substrate and Ni and Pd coatings were successfully determined from the 'composite' hardness values based on the empirical linear relationship with the inverse of indentation diagonal and the rule of mixtures principle.

AB - Hardness and elastic modulus of a typical leadframe material which consists of a Cu alloy substrate with Ni and Pd bi-layer coatings were characterised using Vicker's micro-hardness and nano-indentation tests. The two different testing methods produced similar results in that 'composite' hardness for all coated specimens decreased (except at very low loads in the nano-indentation test) with increasing indentation depth and tended to converge at sufficiently high loads due to the strong influence of the coating/substrate interaction. The hardness values of substrate and Ni and Pd coatings were successfully determined from the 'composite' hardness values based on the empirical linear relationship with the inverse of indentation diagonal and the rule of mixtures principle.

KW - bi-layer coating

KW - Coating-substrate interaction

KW - Composite hardness

KW - Nano-indentation

KW - Vicker's hardness test

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U2 - 10.1007/BF03026404

DO - 10.1007/BF03026404

M3 - Article

AN - SCOPUS:0346874128

SN - 1225-9438

VL - 4

SP - 812

EP - 817

JO - Metals and Materials International

JF - Metals and Materials International

IS - 4

ER -

Indentation Properties of Copper Leadframe with Hard Coatings

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