Journal of Thermal Spray Technology

, Volume 15, Issue 4, pp 701–707 | Cite as

Plasma spray synthesis from precursors: Progress, issues, and considerations

  • B. G. Ravi
  • S. Sampath
  • R. Gambino
  • J. B. Parise
  • P. S. Devi
Reviewed Papers

Abstract

Precursor plasma spray synthesis is an innovative and rapid method for making functional oxide ceramic coatings by starting from solution precursors and directly producing inorganic films. This emerging method utilizes molecularly mixed precursor liquids, which essentially avoids the handling and selection of powders, opening up new avenues for developing compositionally complex functional oxide coatings. Precursor plasma spray also offers excellent opportunities for exploring the nonequilibrium phase evolution during plasma spraying of multicomponent oxides from inorganic precursors. Although there have been efforts in this area since the 1980s and early 1990s with the goal of synthesizing nanoparticles, only recently has the work progressed in the area of functional systems. At the Center for Thermal Spray Research an integrated investigative strategy has been used to explore the benefits and limits of this synthesis strategy. Water- and alcohol-based sol/solution precursors derived from various chemical synthesis methods were used as feedstocks to deposit thin/thick films of spherical and nanostructured coatings of yttrium aluminum garnet (YAG), yttrium iron garnet, lanthanum strontium manganate and Zr-substituted yttrium titanates, and compositions of Y2O3-Al2O3 and their microstructural space centered around stoichiometric YAG. A detailed discussion of the salient features of the radiofrequency induction plasma spraying approach, the results obtained in the investigations to develop various functional oxide coatings, and process issues and challenges are presented.

Keywords

ceramic coatings liquid precursor luminescent coatings magnetic properties microstructure thermal plasma spraying 

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Copyright information

© ASM International 2006

Authors and Affiliations

  • B. G. Ravi
    • 1
  • S. Sampath
    • 1
  • R. Gambino
    • 1
  • J. B. Parise
    • 2
  • P. S. Devi
    • 3
  1. 1.Department of Materials Science and EngineeringCenter for Thermal Spray ResearchUSA
  2. 2.Department of Geosciences and ChemistryState University of New YorkStony Brook
  3. 3.Electroceramics DivisionCentral Glass and Ceramic Research InstituteKolkataIndia

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