Interfacial indentation test and adhesive fracture characteristics of plasma sprayed cermet Cr3C2/Ni-Cr coatings

@article{citeulike:1525264, abstract = {Thermal spraying is often used to create coatings protecting parts against physico-chemical aggressions or improving superficial mechanical properties. It involves several problems because of the high temperatures of the process: cracks, porosity, coating adhesion. The authors use Vickers interfacial indentation test to characterize adhesive fracture between substrates and coatings. From the Lawn's relation two curves: load/crack length ratio (P/C3/2) vs crack length (C1/2) and ln P vs ln C are drawn for varying loads. They allow the determination of the type of residual stress, a coating fracture "toughness"/residual stress ratio (KC/[sigma]r) characterizing interfacial behavior and may lead, in some cases, to residual stress [sigma]r. Influence of superficial remelting by CO2 laser of cermet coating Cr3C2/Ni-Cr deposited on NiCrAlY covered steel and of annealing of Cr3C2/Ni-Cr coated cast iron are then studied. Possibility of reducing residual stress is shown at the same time as the interest of both approaches.}, author = {Hivart, Philippe and Crampon, Jacques}, citeulike-article-id = {1525264}, doi = {10.1016/j.mechmat.2007.05.002}, journal = {Mechanics of Materials}, keywords = {carbon-indentation}, month = {November}, number = {11}, pages = {998--1005}, posted-at = {2007-07-31 15:33:50}, priority = {2}, title = {Interfacial indentation test and adhesive fracture characteristics of plasma sprayed cermet Cr3C2/Ni-Cr coatings}, url = {http://dx.doi.org/10.1016/j.mechmat.2007.05.002}, volume = {39}, year = {2007} }

TY - JOUR ID - citeulike:1525264 L3 - citeulike-article-id:1525264 N2 - Thermal spraying is often used to create coatings protecting parts against physico-chemical aggressions or improving superficial mechanical properties. It involves several problems because of the high temperatures of the process: cracks, porosity, coating adhesion. The authors use Vickers interfacial indentation test to characterize adhesive fracture between substrates and coatings. From the Lawn's relation two curves: load/crack length ratio (P/C3/2) vs crack length (C1/2) and ln P vs ln C are drawn for varying loads. They allow the determination of the type of residual stress, a coating fracture "toughness"/residual stress ratio (KC/[sigma]r) characterizing interfacial behavior and may lead, in some cases, to residual stress [sigma]r. Influence of superficial remelting by CO2 laser of cermet coating Cr3C2/Ni-Cr deposited on NiCrAlY covered steel and of annealing of Cr3C2/Ni-Cr coated cast iron are then studied. Possibility of reducing residual stress is shown at the same time as the interest of both approaches. IS - 11 JF - Mechanics of Materials EP - 1005 TI - Interfacial indentation test and adhesive fracture characteristics of plasma sprayed cermet Cr3C2/Ni-Cr coatings VL - 39 SP - 998 KW - carbon-indentation AU - Hivart, Philippe AU - Crampon, Jacques PY - 2007/11// UR - http://dx.doi.org/10.1016/j.mechmat.2007.05.002 ER -