TY - JOUR
T1 - Adhesive/cohesive properties of thermally sprayed functionally graded coatings for polymer matrix composites
AU - Ivosevic, Milan
AU - Knight, Richard
AU - Kalidindi, Surya R.
AU - Palmese, Giuseppe R.
AU - Sutter, James K.
N1 - Funding Information:
The authors gratefully acknowledge financial support from the Higher Operating Temperature Propulsion Components (HOTPC) project at NASA-Glenn Research Center, Cleveland, OH (NCC3-825). The authors also greatly appreciate the assistance of Mr. Dustin Doss during the HVOF spraying of the coatings, Mr. David Von Rohr during the microscopy and analysis, and Mr. Harold Haller for statistical design and analysis.
PY - 2005/3
Y1 - 2005/3
N2 - High-velocity oxyfuel (HVOF) sprayed polyimide/WC-Co functionally graded (FGM) coatings with flamesprayed WC-Co topcoats have been investigated as solutions to improve the solid-particle erosion and oxidation resistance of polymer matrix composites (PMCs) in the gas flow path of advanced turbine engines. Porosity, coating thickness, and volume fraction of the WC-Co phase retained in the graded coating architecture were determined using standard metallographic techniques and computer image analysis. The adhesive bond strength of three different types of coatings was evaluated according to ASTM D 4541. Adhesive/cohesive strengths of the FGM coating were measured and compared with those of pure polyimide and polyimide/WC-Co composite coatings and also related to the tensile strength of the uncoated PMC substrate perpendicular to the thickness. The FGM coatings exhibited lower adhesive bond strengths (∼6.2 MPa) than pure polyimide coatings (∼8.4 MPa), and in all cases these values were lower than the tensile strength (∼17.6 MPa) of the reference uncoated PMC substrate. The nature and locus of the failures were characterized according to the percent adhesive and/or cohesive failure, and the interfaces tested and layers involved were analyzed by scanning electron microscopy.
AB - High-velocity oxyfuel (HVOF) sprayed polyimide/WC-Co functionally graded (FGM) coatings with flamesprayed WC-Co topcoats have been investigated as solutions to improve the solid-particle erosion and oxidation resistance of polymer matrix composites (PMCs) in the gas flow path of advanced turbine engines. Porosity, coating thickness, and volume fraction of the WC-Co phase retained in the graded coating architecture were determined using standard metallographic techniques and computer image analysis. The adhesive bond strength of three different types of coatings was evaluated according to ASTM D 4541. Adhesive/cohesive strengths of the FGM coating were measured and compared with those of pure polyimide and polyimide/WC-Co composite coatings and also related to the tensile strength of the uncoated PMC substrate perpendicular to the thickness. The FGM coatings exhibited lower adhesive bond strengths (∼6.2 MPa) than pure polyimide coatings (∼8.4 MPa), and in all cases these values were lower than the tensile strength (∼17.6 MPa) of the reference uncoated PMC substrate. The nature and locus of the failures were characterized according to the percent adhesive and/or cohesive failure, and the interfaces tested and layers involved were analyzed by scanning electron microscopy.
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U2 - 10.1361/10599630522765
DO - 10.1361/10599630522765
M3 - Article
AN - SCOPUS:15744380208
SN - 1059-9630
VL - 14
SP - 45
EP - 51
JO - Journal of Thermal Spray Technology
JF - Journal of Thermal Spray Technology
IS - 1
ER -