• Chinese Journal of Lasers
  • Vol. 40, Issue 4, 403004 (2013)
Zhou Shengfeng1、*, Dai Xiaoqin2, Xiong Zheng3, and Zhang Tianyou1
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
  • 3[in Chinese]
  • show less
    DOI: 10.3788/cjl201340.0403004 Cite this Article Set citation alerts
    Zhou Shengfeng, Dai Xiaoqin, Xiong Zheng, Zhang Tianyou. Functionally Graded YSZ/NiCrAlY Coating Prepared by Laser Induction Hybrid Rapid Cladding[J]. Chinese Journal of Lasers, 2013, 40(4): 403004 Copy Citation Text show less

    Abstract

    To eliminate cracks and thermally grown oxide (TGO) in thermal barrier coatings (TBCs), the functionally graded yttria-stabilized-zirconia (YSZ)/NiCrAlY coating by laser induction hybrid rapid cladding (LIHRC) is investigated. The results show that the crack-free YSZ/NiCrAlY coating with good profile and gradual microhardness can be obtained when laser scanning speed and powder feeding rate increase to 3200 mm/min and 90.63 g/min during LIHRC, respectively. The c-ZrO2, m-ZrO2 and t-ZrO2 phases in primary YSZ powder are all completely transformed into the metastable t′-ZrO2 phase. The fine, dense and dual-phase microstructure composed of columnar dendrites is characterized by the gradual increase of YSZ content in the coating. Moreover, the interface of consecutive layer disappears, which is different from ceramic layer-bond layer (i.e., double-layer) constituent of TBCs formed during the individual laser cladding. After the isothermal oxidation, the metastable t′-ZrO2 phase in the LIHRC-formed functionally graded YSZ/NiCrAlY coating transforms into t-ZrO2, which can increase the oxidation resistance of superalloy GH4169.
    Zhou Shengfeng, Dai Xiaoqin, Xiong Zheng, Zhang Tianyou. Functionally Graded YSZ/NiCrAlY Coating Prepared by Laser Induction Hybrid Rapid Cladding[J]. Chinese Journal of Lasers, 2013, 40(4): 403004
    Download Citation