Dry electrical discharge coating process on aluminum by using titanium powder compact electrode

Hsin Jen Chen, Kun Ling Wu, Biing Hwa Yan

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

This study examines the electrical discharge coating process by using Ti powder compact electrode in pure nitrogen gas (dry EDC) to modify the surface of Al alloy. The stable dry EDC process on Al Alloy are explored via optimizing the discharge current, pulse duration, and duty factor. Experimental results show that the material deposition rate (MDR) and composition of films are closely related to the appropriate setting of discharge parameters. Only with adequate electrical discharge energy, the pure titanium nitride (TiN) film can form on the surface of Al alloy. Excessive electrical discharge energy in the dry EDC process will trigger the self-propagating high-temperature synthesis (SHS) reaction of Ti powder compact electrode and nitrogen gas, which deteriorates the surface quality of the deposit. A coarser TiN film coexisted with weak second phase (Ti2N) and minor aluminum nitride (AlN) under this condition. Meanwhile, it also contained a few voids in the film due to incomplete coverage and microcracks resulted from thermal expansion mismatch between TiN and the Al matrix.

Original languageEnglish
Pages (from-to)1286-1293
Number of pages8
JournalMaterials and Manufacturing Processes
Volume28
Issue number12
DOIs
StatePublished - 2 Dec 2013

Keywords

  • Aluminum
  • Coating
  • Discharge
  • Dry
  • Energy
  • Nitride
  • Self-propagating
  • Stable
  • Synthesis
  • Titanium
  • Unstable

Fingerprint

Dive into the research topics of 'Dry electrical discharge coating process on aluminum by using titanium powder compact electrode'. Together they form a unique fingerprint.

Cite this