TY - JOUR

T1 - Improvement of coating properties in three-cathode atmospheric plasma spraying

AU - Bobzin, K.

AU - Kopp, N.

AU - Warda, T.

AU - Petković, I.

AU - Zimmermann, S.

AU - Hartz-Behrend, K.

AU - Landes, K.

AU - Forster, G.

AU - Kirner, S.

AU - Marqués, J. L.

AU - Schein, J.

AU - Prehm, J.

AU - Möhwald, K.

AU - Bach, Fr W.

N1 - Funding Information: The authors gratefully acknowledge the financial support of the German Research Foundation (DFG) within the project ‘‘Homogenization of Coating Properties in Atmospheric Plasma Spraying’’ (PAK 193).

PY - 2013/4

Y1 - 2013/4

N2 - The main aim of this study is to improve the coating properties of three-cathode atmospheric plasma-sprayed coatings with respect to porosity and residual stresses. This was done by means of numerical simulation coupled with advanced diagnostic methods. A numerical model for the triple injection of alumina feedstock, as well as acceleration and heating of the powder particles in the characteristic threefold symmetrical plasma jet cross section produced by a three-cathode-plasma torch, was developed. The modeling results for the standard injector's position "0" were calculated and experimentally verified by laser Doppler anemometry. Based on the criteria defined for the concentrated feedstock transport and homogeneous thermal treatment of powder particles in the plasma jet, the optimal injection position was found. In the next step, a previously developed, coupled CFD-FEM-simulation model was used for simulations of the coating build-up, describing flattening, solidification, and deformation due to shrinkage for alumina particles on a rough substrate surface.

AB - The main aim of this study is to improve the coating properties of three-cathode atmospheric plasma-sprayed coatings with respect to porosity and residual stresses. This was done by means of numerical simulation coupled with advanced diagnostic methods. A numerical model for the triple injection of alumina feedstock, as well as acceleration and heating of the powder particles in the characteristic threefold symmetrical plasma jet cross section produced by a three-cathode-plasma torch, was developed. The modeling results for the standard injector's position "0" were calculated and experimentally verified by laser Doppler anemometry. Based on the criteria defined for the concentrated feedstock transport and homogeneous thermal treatment of powder particles in the plasma jet, the optimal injection position was found. In the next step, a previously developed, coupled CFD-FEM-simulation model was used for simulations of the coating build-up, describing flattening, solidification, and deformation due to shrinkage for alumina particles on a rough substrate surface.

KW - atmospheric plasma spray (APS)

KW - computational fluid dynamics

KW - diagnostics

KW - finite element modeling

KW - heat transfer

KW - modeling of coating formation

KW - particle plasma interaction

UR - http://www.scopus.com/inward/record.url?scp=84885602677&partnerID=8YFLogxK

U2 - 10.1007/s11666-013-9902-2

DO - 10.1007/s11666-013-9902-2

M3 - Article

AN - SCOPUS:84885602677

VL - 22

SP - 502

EP - 508

JO - Journal of Thermal Spray Technology

JF - Journal of Thermal Spray Technology

SN - 1059-9630

IS - 4

ER -