TY - GEN
T1 - Materials for electronics by thermal spraying
AU - Ronkainen, Helena
AU - Kanerva, Ulla
AU - Varis, Tommi
AU - Ruusuvuori, Kimmo
AU - Turunen, Erja
AU - Peräntie, Jani
AU - Putaala, Jussi
AU - Juuti, Jari
AU - Jantunen, Heli
PY - 2013
Y1 - 2013
N2 - In this paper, dielectric and conductive properties of thermally sprayed Al2O3- and Cubased coatings on steel and alumina substrates were studied. Alumina powders with nano- and micro-sized additions of Ni, NiO, TiO2, silica, and commercial glass were used in High Velocity Oxygen Fuel (HVOF) deposition. The conventional commercial copper powder and three Ag, WC and H2 -modified powders were used in Direct Write Thermal Spray (DWTS) deposition. Mixed phases of α-Al2O3 and γ-Al2O3 were found to be present in the as-deposited coatings. Sprayed alumina-based composites exhibited dielectric permittivity of 5.3-13.9 and losses of 0.002-0.178 at 1 MHz and 1 GHz while the additions tend to increase the values. Sprayed compositions with glasstype additions were found to retain α-Al2O3 crystalline phase after the deposition. Cu depositions, especially modified ones, realised by Direct Write Thermal Spray (DWTS) showed conductivity values as high as 42-56% of IACS values. The results demonstrate that ceramic and conductive coatings fabricated by thermal spray techniques show feasible properties for electrical applications, such as low-frequency components and insulation layers to be utilised in embedded 3D circuitry, in a way that is not possible through traditional manufacturing methods.
AB - In this paper, dielectric and conductive properties of thermally sprayed Al2O3- and Cubased coatings on steel and alumina substrates were studied. Alumina powders with nano- and micro-sized additions of Ni, NiO, TiO2, silica, and commercial glass were used in High Velocity Oxygen Fuel (HVOF) deposition. The conventional commercial copper powder and three Ag, WC and H2 -modified powders were used in Direct Write Thermal Spray (DWTS) deposition. Mixed phases of α-Al2O3 and γ-Al2O3 were found to be present in the as-deposited coatings. Sprayed alumina-based composites exhibited dielectric permittivity of 5.3-13.9 and losses of 0.002-0.178 at 1 MHz and 1 GHz while the additions tend to increase the values. Sprayed compositions with glasstype additions were found to retain α-Al2O3 crystalline phase after the deposition. Cu depositions, especially modified ones, realised by Direct Write Thermal Spray (DWTS) showed conductivity values as high as 42-56% of IACS values. The results demonstrate that ceramic and conductive coatings fabricated by thermal spray techniques show feasible properties for electrical applications, such as low-frequency components and insulation layers to be utilised in embedded 3D circuitry, in a way that is not possible through traditional manufacturing methods.
KW - Conductivity
KW - Dielectric properties
KW - Direct write thermal spray
KW - HVOF
KW - Thermal spraying
UR - http://www.scopus.com/inward/record.url?scp=84880770459&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.762.451
DO - 10.4028/www.scientific.net/MSF.762.451
M3 - Conference contribution
AN - SCOPUS:84880770459
SN - 9783037857281
VL - 762
T3 - Materials Science Forum
SP - 451
EP - 456
BT - Physical and Numerical Simulation of Materials Processing VII
T2 - 7th International Conference on Physical and Numerical Simulation of Materials Processing, ICPNS 2013
Y2 - 16 June 2013 through 19 June 2013
ER -