TY - GEN
T1 - Estimation of molten content of the spray stream from analysis of experimental particle diagnostics
AU - Srinivasan, V.
AU - Sampath, S.
PY - 2009
Y1 - 2009
N2 - Particle melting is one of the key issues in air plasma spray processing of high temperature ceramics such as Yttria Stabilized Zirconia (YSZ). The significance of assessing, monitoring and controlling the molten content in the spray stream on achieving reproducible coating characteristics and properties is known. This study aims to estimate the molten content of the spray stream (as an ensemble) from experimental measurement of in-flight (individual) particle characteristics. In a previous study by Streibl et al the presence of melting signature in the particle temperature distribution was observed, which has been confirmed by simulation and though independent experimental observation by Mauer et al. Based on this observation, the particle temperature distribution could be delineated into the different achievable particle states inflight (unmolten, partially molten and completely molten) to a first approximation. This in-turn would malee it possible to estimate the molten content in the spray stream. The so estimated percentage molten content (referred in this study as Spray Stream Melting Index - SSMI) has been observed to correlate well with the experimentally measured (relative) deposition efficiency for a wide range of process conditions and feedstock characteristics. The implications of estimating SSMI for other materials and processes are also discussed.
AB - Particle melting is one of the key issues in air plasma spray processing of high temperature ceramics such as Yttria Stabilized Zirconia (YSZ). The significance of assessing, monitoring and controlling the molten content in the spray stream on achieving reproducible coating characteristics and properties is known. This study aims to estimate the molten content of the spray stream (as an ensemble) from experimental measurement of in-flight (individual) particle characteristics. In a previous study by Streibl et al the presence of melting signature in the particle temperature distribution was observed, which has been confirmed by simulation and though independent experimental observation by Mauer et al. Based on this observation, the particle temperature distribution could be delineated into the different achievable particle states inflight (unmolten, partially molten and completely molten) to a first approximation. This in-turn would malee it possible to estimate the molten content in the spray stream. The so estimated percentage molten content (referred in this study as Spray Stream Melting Index - SSMI) has been observed to correlate well with the experimentally measured (relative) deposition efficiency for a wide range of process conditions and feedstock characteristics. The implications of estimating SSMI for other materials and processes are also discussed.
UR - https://www.scopus.com/pages/publications/76749088491
U2 - 10.1361/cp2009itsc0866
DO - 10.1361/cp2009itsc0866
M3 - Conference contribution
AN - SCOPUS:76749088491
SN - 9781615030040
T3 - Proceedings of the International Thermal Spray Conference
SP - 866
EP - 871
BT - Expanding Thermal Spray Performance to New Markets and Applications - Proceedings of the 2009 International Thermal Spray Conference, ITSC 2009
T2 - Expanding Thermal Spray Performance to New Markets and Applications - 2009 International Thermal Spray Conference, ITSC 2009
Y2 - 4 May 2009 through 7 May 2009
ER -