Indentation Properties of Copper Leadframe with Hard Coatings

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

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


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 languageBritish English
Pages (from-to)812-817
Number of pages6
JournalMetals and Materials International
Issue number4
StatePublished - 1998


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


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