TY - JOUR
T1 - Process control and characterization of NiCr coatings by HVOF-DJ2700 system
T2 - A process map approach
AU - Valarezo, Alfredo
AU - Choi, Wanhuk B.
AU - Chi, Weiguang
AU - Gouldstone, Andrew
AU - Sampath, Sanjay
N1 - Funding Information:
This research was supported by the GOALI-FRG program of the National Science Foundation under award number CMMI 0605704 and by the Consortium of Thermal Spray Technology at the Center for Thermal Spray Research in Stony Brook University. The authors would like to thank Prof. Margaret Hyland and Anh Tran for the FIB micrographs.
PY - 2010/9
Y1 - 2010/9
N2 - The concept of 'process maps' has been utilized to study the fundamentals of process-structure-property relationships in high velocity oxygen fuel (HVOF) sprayed coatings. Ni-20%Cr was chosen as a representative material for metallic alloys. In this paper, integrated experiments including diagnostic studies, splat collection, coating deposition, and property characterization were carried out in an effort to investigate the effects of fuel gas chemistry (fuel/oxygen ratio), total gas flow, and energy input on particle states: particle temperature (T) and velocity (V), coating formation dynamics, and properties. Coatings were deposited on an in situ curvature sensor to study residual stress evolution. The results were reconciled within the framework of process maps linking torch parameters with particle states (1st order map) and relating particle state with deposit properties (2nd order map). A strong influence of particle velocity on induced compressive stresses through peening effect is discussed. The complete tracking of the coating buildup history including particle state, residual stress evolution and deposition temperature, in addition to single splat analysis, allows the interpretation of resultant coating microstructures and properties and enables coating design with desired properties.
AB - The concept of 'process maps' has been utilized to study the fundamentals of process-structure-property relationships in high velocity oxygen fuel (HVOF) sprayed coatings. Ni-20%Cr was chosen as a representative material for metallic alloys. In this paper, integrated experiments including diagnostic studies, splat collection, coating deposition, and property characterization were carried out in an effort to investigate the effects of fuel gas chemistry (fuel/oxygen ratio), total gas flow, and energy input on particle states: particle temperature (T) and velocity (V), coating formation dynamics, and properties. Coatings were deposited on an in situ curvature sensor to study residual stress evolution. The results were reconciled within the framework of process maps linking torch parameters with particle states (1st order map) and relating particle state with deposit properties (2nd order map). A strong influence of particle velocity on induced compressive stresses through peening effect is discussed. The complete tracking of the coating buildup history including particle state, residual stress evolution and deposition temperature, in addition to single splat analysis, allows the interpretation of resultant coating microstructures and properties and enables coating design with desired properties.
KW - HVOF
KW - NiCr
KW - mechanical properties
KW - process control
KW - process maps
KW - residual stress
KW - transport properties
UR - http://www.scopus.com/inward/record.url?scp=78049462119&partnerID=8YFLogxK
U2 - 10.1007/s11666-010-9492-1
DO - 10.1007/s11666-010-9492-1
M3 - Artículo
AN - SCOPUS:78049462119
SN - 1059-9630
VL - 19
SP - 852
EP - 865
JO - Journal of Thermal Spray Technology
JF - Journal of Thermal Spray Technology
IS - 5
ER -