J. Mater. Sci. Technol. ›› 2021, Vol. 65: 7-17.DOI: 10.1016/j.jmst.2020.04.067

• Research Article • Previous Articles     Next Articles

Phase structure of sputtered Ta coating and its ablation behavior by laser pulse heating (LPH)

Yunsong Niua,*(), Lingling Xingb, Feng Yangc, Huawei Lib, Minghui Chend, Shenglong Zhua, Fuhui Wangd   

  1. aCorrosion and Protection Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
    bCollege of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, 110034, China
    cSchool of Equipment Engineering, Shenyang Ligong University, Shenyang, 110159, China
    dCorrosion and Protection Division, Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang, 110819, China
  • Received:2019-11-04 Revised:2020-04-08 Accepted:2020-04-12 Published:2021-02-28 Online:2021-03-15
  • Contact: Yunsong Niu
  • About author:* E-mail address: ysniu@imr.ac.cn (Y. Niu).

Abstract:

Phase structure of sputtered Ta coating in the negative glow space and LPH effect were explored. The whole coating/substrate system is substrate → physically gas-absorbed Fe surface → oxygen-enriched TaOx layer → amorphous Ta → α and β dual phase → single α phase. After LPH course, microstructure of Ta coating shows intact, only a few cracks emerge after 100 laser pulses, exhibiting thin HAZ but thick Fe/Ta ICZ, without martensitic transformation. For the electrodeposited Cr coating, continuous thermal stresses produce many extra micro-crack, substrate oxidation and martensitic transformation, leading to crack propagations and final bulk delamination, without any ICZ.

Key words: Sputtered Ta coating, Phase structure, Laser pulse heating, Inter-connected zone (ICZ), Heat-affected zone (HAZ), Ablation