S. Sampath, S.U.N.Y at Stony Brook, Stony Brook, NY; B. G. Ravi, R. Gambino, J. B. Parise, Center for Thermal Spray Research, Stony Brook, NY
In recent years there has been considerable interest in using thermal spray methods towards synthesis of inorganic oxides. This emerging method of precursor thermal spraying or precursor plasma spraying (PPS), utilizes molecularly mixed precursor liquids as feedstock, which basically avoids the handling and selection of powders, and allows new avenues for developing compositionally complex functional oxide coatings. PPS also offers excellent opportunities in exploring the non-equilibrium phase evolution during plasma spraying of multi-component oxides from inorganic precursors.
In our research, 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 (YIG), lanthanum strontium manganate (LSM) and Zr-substituted yttrium titanates. Compositions of Y
2O
3-Al
2O
3 and their microstructural space centered around stochiometric YAG phase have also been investigated in a combinatorial manner. The overall process of spraying, chemical reaction and particle formation occurred within 40 s, indicating the simplicity of the process. Free from electrode contamination of the products, axial injection, larger hot zone, controllable temperature are the key advantages of this process. A detailed discussion of the salient features of PPS approach, results obtained in the investigations to develop various functional oxide coatings and process issues and challenges will be presented.
The emerging method of precursor plasma spraying (PPS), utilizes molecularly mixed precursor liquids as feedstock, which basically avoids the handling and selection of powders, and allows new avenues for developing compositionally complex functional oxide coatings. PPS also offers excellent opportunities in exploring the non-equilibrium phase evolution during plasma spraying of multi-component oxides from inorganic precursors.
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 (YIG), lanthanum strontium manganate (LSM) and Zr-substituted yttrium titanates. Detailed discussion of the salient features of PPS approach, results obtained in the investigations to develop various functional oxide coatings and process issues and challenges will be presented.
