TY - GEN
T1 - Development of the particle interface bonding in thermal spray coatings for expanding high performance applications
AU - Li, Chang Jiu
AU - Yang, Guan Jun
AU - Li, Cheng Xin
PY - 2012
Y1 - 2012
N2 - Thermally sprayed coatings are formed through the successive impact of molten droplets or/and semi-molten particles following by flattening, rapid cooling and solidification of melt. Individual droplets flatten to form splats of several micrometers in thickness on impact and result in the formation of the coating of a lamellar structure with a limited interface bonding. The inclusion of semi-molten particles in the coating modifies its microstructure. The bonding between particles dominates coating properties and performances. In this review paper, the bonding formation at the interface between thin lamellae in the coating is examined. The effect of spray parameters on the bonding ratio is presented to reveal the main droplet parameters controlling bonding formation. It is shown that spray particle temperature dominates the bonding formation than particle velocity. The limitation to increase significantly ceramic particle temperature inherent to thermal spray process leads to the observation of the maximum bonding ratio of about 32%. On the other hand, it was found that through controlling the surface temperature of coating prior to molten droplet impact, the bonding at the lamellar interface can be significantly increased. Consequently, with the proper selection of deposition conditions and the control of surface temperature, the bonding ratio of ceramic deposits can be altered from a maximum of 32% for a conventional deposit to the maximum of 100%. Such wide adjustability of the lamellar bonding makes plasma spray coatings be applicable to different applications requiring different microstructures and properties. Moreover, the bonding control makes it possible to fabricate porous deposits through surface-molten particles which can be applied to the fabrication of porous materials, deposition of high temperature abradable ceramic coating, and formation of super-hydrophobic surface. Furthermore, the complete interface bonding leads to the crystalline structure control of individual splats through epitaxial grain growth.
AB - Thermally sprayed coatings are formed through the successive impact of molten droplets or/and semi-molten particles following by flattening, rapid cooling and solidification of melt. Individual droplets flatten to form splats of several micrometers in thickness on impact and result in the formation of the coating of a lamellar structure with a limited interface bonding. The inclusion of semi-molten particles in the coating modifies its microstructure. The bonding between particles dominates coating properties and performances. In this review paper, the bonding formation at the interface between thin lamellae in the coating is examined. The effect of spray parameters on the bonding ratio is presented to reveal the main droplet parameters controlling bonding formation. It is shown that spray particle temperature dominates the bonding formation than particle velocity. The limitation to increase significantly ceramic particle temperature inherent to thermal spray process leads to the observation of the maximum bonding ratio of about 32%. On the other hand, it was found that through controlling the surface temperature of coating prior to molten droplet impact, the bonding at the lamellar interface can be significantly increased. Consequently, with the proper selection of deposition conditions and the control of surface temperature, the bonding ratio of ceramic deposits can be altered from a maximum of 32% for a conventional deposit to the maximum of 100%. Such wide adjustability of the lamellar bonding makes plasma spray coatings be applicable to different applications requiring different microstructures and properties. Moreover, the bonding control makes it possible to fabricate porous deposits through surface-molten particles which can be applied to the fabrication of porous materials, deposition of high temperature abradable ceramic coating, and formation of super-hydrophobic surface. Furthermore, the complete interface bonding leads to the crystalline structure control of individual splats through epitaxial grain growth.
UR - https://www.scopus.com/pages/publications/84906973275
M3 - 会议稿件
AN - SCOPUS:84906973275
SN - 9781632666796
T3 - Proceedings of the International Thermal Spray Conference
SP - 47
EP - 57
BT - International Thermal Spray Conference and Exposition, ITSC 2012 - Air, Land, Water and the Human Body
PB - ASM International
T2 - International Thermal Spray Conference and Exposition - Air, Land, Water and the Human Body: Thermal Spray Science and Applications, ITSC 2012
Y2 - 21 May 2012 through 24 May 2012
ER -