The preparation and properties of Sm2Zr2O7 coatings by plasma spraying

W. Z. Tian, L. Liu*, Z. Ma, Y. B. Liu, X. Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Rare-earth zirconate with lower thermal conductivity compared to zirconia ceramic is very promising new thermal barrier coating material. In this article, Sm2Zr2O7 precursors were synthesised by the co-precipitation method, and the size of crystal grain was between 20 and 30 nm. Then, the precursor and the powder calcined in 1250°C were granulated by the spray dryingmethod. The adaptabilities of two kinds of powders for plasma spraying process were discussed. The results show that the crystal grain size of powder granulated directly by precursor was between 40 and 50 nm, and the one granulated by precursor calcined in 1250°C was between 150 and 200 nm. Under the same parameters of plasma spraying, the coating made by calcined powder was denser and its bond strength was higher; as the value of current dropped and secondary gas increased, the particles flied faster. To the submicron crystalline powder, the ratio of unmelted particles increased and equal-axis structures dropped, the coating'sbond strength decreased. To the nano crystallinepowder, the ratio of unmelted particles decreased and equal-axis structures increased, the coating's bond strength rose.

Original languageEnglish
Pages (from-to)S24-S28
JournalMaterials Research Innovations
Volume19
DOIs
Publication statusPublished - 1 May 2015

Keywords

  • Bond strength
  • Crystal grain size
  • Equal-axis structures
  • SmZrO

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Tian, W. Z., Liu, L., Ma, Z., Liu, Y. B., & Li, X. (2015). The preparation and properties of Sm2Zr2O7 coatings by plasma spraying. Materials Research Innovations, 19, S24-S28. https://doi.org/10.1179/1432891715Z.0000000001510