Microstructure and Phase Composition of Iridium Coating on Molybdenum after Heat Treatment at 1400°C

Abstract:

Iridium (Ir) could be taken as high temperature protective coating for the refractory metals. Ir coating was deposited on the surface of molybdenum (Mo) substrate by double glow plasma. Thermal stability of the coating was investigated at 1400°C for 90 min, while Ar gas was inputted to hold the vacuum pressure. The microstructure of the surface and interface of the Ir coating were observed by SEM and TEM. The phase transition of the coating was determined by X-ray diffraction. Many micropores and microbubbles appeared in the surface of the as-heat treated coating. The interfacial reaction between the Mo substrate and Ir coating occurred during heat treatment, and Ir21.5Mo8.5 phase was formed at 1400°C. The experimental results indicated that the integrity of the Ir coating was not degraded after heat treatment.

• Periodical: Advanced Materials Research (Volumes 189-193)
• Pages: 688-691
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.189-193.688
• Online since: February 2011
• Authors: Wang Ping Wu, Zhao Feng Chen, Xin Lin
• Keywords: Double Glow Plasma, Ir Coating, Microstructure, Mo

References

[1] B.V. Coockeram: Metall. Mater. Trans. Vol. 36A (2005), p.1777.

[2] E. K. Ohriner: Platinum Met. Rev. Vol. 52 (2008), p.186.

[3] J.C. Hamilton, N.Y.C. Yang, W.M. Clift, D.R. Boehme, K.F. Mccarty and J.E. Franklin: Metall. Trans. Vol. 23A (1992), p.851.

[4] S. Chen, C.Y. Hu, J.M. Guo and J.M. Yan: Rare Metal Mater. and Eng. Vol. 34 (2005), p.916 (In Chinese).

[5] W.B. Yang, L.T. Zhang, Y.F. Hua and L.F. Cheng: Int. J. Refract. Met. Hard Mater. Vol. 27 (2009), p.33.

[6] A. Etenko, T. McKechnie, A. Shchetkovskiy and A. Smirnov: ECS Transactions Vol. 3 (14) (2007), p.151.

[7] K. Mumtaz, J. Echigoya, H Enoki, T Hirai and Y Shindo: J. Mater. Sci. Vol. 30 (1995), p.465.

[8] L.B. Wang, Z.F. Chen, P.Z. Zhang, W.P. Wu and Y. Zhang: J. Coat. Technol. Res. Vol. 6 (4) (2009), p.517.

[9] R.P.U. Karunasiri, R. Bruinsma and J. Rudnick: Phys. Rev. Lett. Vol. 62 (7) (1989), p.788.

[10] L.B. Wang, Z.F. Chen, Y. Zhang and W.P. Wu: Int. J. Refract. Met. Hard Mater. Vol. 27 (2009), p.590.

[11] J.A. Thornton: Ann. Rev. Mater. Sci. Vol. 7 (1977), p.239.

[12] K. Mumtaz, J. Echigoya, T Hirai and Y Shindo: J. Mater. Sci. lett. Vol. 12 (1993), p.1411.

[13] L. Brewer and R.H. Lamoreaux: International Atomic Energy Agency, Vienna, Vol. 7 (1980), p.263.

[14] E.K. Ohriner and E.P. George: J. Alloys Comp. Vol. 177 (1991), p.219.