Research Progresses of Atmospheric Plasma Sprayed Splat

doi:10.15541/jim20160461

Abstract

Abstract:

Atmospheric plasma spraying (APS) is a well-established method to fabricate coatings. Since the coatings are piled up with splat, the morphology of splats is of significant importance for the microstructure and performance of coatings deposited by APS. In the current review, the influences of parameters in spraying processes on formation of splats were divided into three categories, namely the droplet-related factors, substrate-related factors and environmental-related factors. The influence of above mentioned factors on morphology of splats were systematically introduced. Among them, effect of powder size and substrates preheating were emphatically discussed. Future research direction was also pointed out based on the reviewed literature in this paper.

Key words: atmospheric plasma spraying, thermal barrier coatings, droplet, splat, review

CLC Number:

TQ174

LI Da-Chuan, ZHAO Hua-Yu, ZHONG Xing-Hua, TAO Shun-Yan. Research Progresses of Atmospheric Plasma Sprayed Splat[J]. Journal of Inorganic Materials, 2017, 32(6): 571-580.

Figures/Tables 9

Fig. 1 Schematic drawing of typical plasma torch

Table 1 Average values of the particle size, velocity and temperature at different radial positions from the plasma jet center line[12]

Radial position /mm	Average particle diameter /μm	Average particle velocity/(m·s^-1)	Average particle temperature /K
+50	25.7	236	3310
+40	26.3	247	3342
+30	27.8	254	3392
+20	30.3	248	3430
+10	32.3	233	3420
0	36.5	228	3400
-10	37.0	215	3340
-20	38.2	209	3310
-30	42.3	199	3294
-40	44.3	191	3270
-50	45.6	188	3250

Fig. 2 Shape and interior morphologies of the ceramic powder provided by Oerlikon Metco[13]

Fig. 3 Computer-generated images of the normal impact of a molten and a semi-molten nickel droplet[17]

Fig. 4 Schematic of the experimental setup and typical signals collected during an impact of a molybdenum droplet on a smooth glass substrate[26]

Fig. 5 Comparison of cooling and solidiﬁcation processes inside the splat deposited onto substrates at a temperature above (left) and below (right) transition temperature[34]

Fig. 6 SEM images of YSZ splats on patterned silicon surface[40]

Fig. 7 Surface topologies of stainless steel surfaces either non-oxidized or preoxidized at different temperatures, images of nickel splats after solidification and cooling curves of splats[39]

Fig. 8 Grain size in a cross-section of the splat obtained in different ambient pressures[28](a) on stainless steel in atmospheric pressure; (b) on gold-coated stainless steel in atmospheric pressure; (c) on stainless steel under low pressure; and (d) on gold-coated stainless steel under low pressure

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