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Plasma Spray Deposition of Lanthanum Phosphate and Phase Structure of the Resultant Coatings

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Abstract

Plasma-sprayed lanthanum phosphate coatings were prepared on stainless steel substrates at different input powers from 16 to 24 kW. Coatings were characterized by x-ray diffraction, scanning electron microscopy, and Fourier transformed infrared spectroscopy. Results showed that the as-sprayed coatings consist of lanthanum ortho (LaPO4), poly(La2P4O13), and oxy(La3PO7) phosphates. Subsequent heat treatment of the coatings resulted in the recombination of the La-polyphosphate and La-oxyphosphate to form LaPO4. SEM images of microstructure of the coatings and coating-substrate interface showed micro-cracks, voids, and porosity that were found to decrease with deposition power.

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Acknowledgment

The Authors AP and KR gratefully acknowledge funding from Board of Research in Nuclear Sciences (BRNS), Department of Atomic Energy, Mumbai through the research project No: 2010/34/6-BRNS/632, dated: 23.07.2010. We would like to extend our thanks to Mr Raneesh B., School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam, Kerala for the measurement of FTIR.

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Authors and Affiliations

  1. Department of Physics, Karunya University, Coimbatore, Tamil Nadu, 641114, India

    A. Pragatheeswaran

  2. Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    A. Pragatheeswaran, P. V. Ananthapadmanabhan, Y. Chakravarthy, Vandana Chaturvedi & Subhankar Bhandari

  3. Department of Physics, Bharathiar University, Coimbatore, Tamil Nadu, 641046, India

    K. Ramachandran

Authors
  1. A. Pragatheeswaran
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  2. P. V. Ananthapadmanabhan
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  3. Y. Chakravarthy
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  4. Vandana Chaturvedi
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  5. Subhankar Bhandari
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  6. K. Ramachandran
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Corresponding authors

Correspondence to A. Pragatheeswaran or P. V. Ananthapadmanabhan.

Additional information

This article is an invited paper selected from presentations at the 6th Asian Thermal Spray Conference (ATSC 2014) and has been expanded from the original presentation. ATSC 2014 was held in Hyderabad, India, November 24–26, 2014, and was organized by the International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI) and the Asian Thermal Spray Society.

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Pragatheeswaran, A., Ananthapadmanabhan, P.V., Chakravarthy, Y. et al. Plasma Spray Deposition of Lanthanum Phosphate and Phase Structure of the Resultant Coatings. J Therm Spray Tech 24, 1377–1384 (2015). https://doi.org/10.1007/s11666-015-0320-5

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  • DOI: https://doi.org/10.1007/s11666-015-0320-5

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