Improve Stability of Dicalcium Silicate/Zirconia Composite Coatings by Post-Spraying Heat Treatment

Abstract:

The long-term stability of plasma-sprayed dicalcium silicate (C2S) composite coatings is determined by the phase composition, crystallinity, and other properties. Zirconia reinforcement and post-spraying heat treatment are applied to C2S coatings simultaneously in this work. The stability of the coating increases evidently by reinforcement with 70wt% zirconia and heat treatment at 800oC for 4 hours. SEM reveals that the smooth glassy surface of the as-sprayed coatings is replaced by randomly dispersed crystals. Tris-HCl immersion test results show that the dissolution rate of the composite coatings decreases after the heat treatment.

• Periodical: Solid State Phenomena (Volume 107)
• Pages: 141-144
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.107.141
• Online since: October 2005
• Authors: Youtao Xie, Paul K. Chu, Xuan Yong Liu, Chuan Xian Ding
• Keywords: Dicalcium Silicate, Heat Treatment, Plasma Spraying, Stability, Zirconia

References

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1 2 3 4 5 6 7 2. 70 2. 85 3. 00 3. 15 After annealing as-sprayed Ca concentration (mM) Time (days) Fig. 5 Mass loss of the coatings before and after heat treatment.

[1] 2 3 4 5 6 7.

[1] [2] [3] [4] [5] After annealing As-sprayed Mass loss (mg/cm2 ) Time (days).