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Ceramics international v.43 no.6, 2017년, pp.4858 - 4865   SCI SCIE SCOPUS
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Synthesis, spray granulation and plasma spray coating of lanthanum phosphate nanorods for thermal insulation coatings

Midhun, M. (Materials Science and Technology Division, CSIR, National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695019, Kerala, India ) ; Pragatheeswaran, A. (Centre for Scientific and Applied Research, PSN College of Engineering and Technology, Tirunelveli 627152, India ) ; Sankar, S. (Materials Science and Technology Division, CSIR, National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695019, Kerala, India ) ; Shijina, K. (Materials Science and Technology Division, CSIR, National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695019, Kerala, India ) ; Firozkhan, M. (Materials Science and Technology Division, CSIR, National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695019, Kerala, India ) ; Peer Mohamed, A. (Materials Science and Technology Division, CSIR, National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695019, Kerala, India ) ; Ananthapadmanabhan, P.V. (Centre for Scientific and Applied Research, PSN College of Engineering and Technology, Tirunelveli 6 ) ; Warrier, K.G.K. ; Hareesh, U.S. ;
  • 초록  

    Abstract Nanorods of lanthanum phosphate obtained by a wet chemical precipitation route were granulated to obtain sizes in the range of 10–15μm by spray drying from aqueous slurry of 35wt% solid loading and 2wt% of PVA binder. The powders thus obtained displayed enhanced flowability and were plasma sprayed on to stainless steel substrates resulting in the formation of adherent coatings of 150–180μm thickness. These coatings were characterized using electron microscopy, X-ray diffraction analysis and Raman spectroscopy. X-ray analysis indicated phase instability of LaPO 4 during plasma spraying resulting in the formation of oxy and polyphosphates of lanthanum (La 2 P 4 O 13 and La 3 PO 7 ). However, post deposition heat treatment of coated samples at 1100°C for 2h resulted in the reversible formation of stoichiometric lanthanum orthophosphate (LaPO 4 ). Raman spectral analysis was used to confirm the phase structure of the coatings deposited at various plasma input powers. The coatings obtained were found to effectively lower the thermal conductivity of the substrates from ~24W/mK to less than 19W/mK (~10%) even at 200°C.


  • 주제어

    Lanthanum phosphate .   Sol-gel process .   Spray granulation .   Coatings .   Plasma spray coatings.  

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