Preparation of Si/Mullite/Yb2SiO5 Environment Barrier Coating (EBC) by Plasma Spray-Physical Vapor Deposition (PS-PVD)

doi:10.15541/jim20170194

Abstract

Abstract:

Environmental barrier coating (EBC) Si/3Al₂O₃-2SiO₂/Yb₂SiO₅ was prepared by plasma spray-physical vapor deposition (PS-PVD) on SiC/SiC ceramic matrix composites. The surface and interface of tri-layered EBC were characterized by SEM. And the phase transformation of the mullite coating was analyzed by XRD. The interaction of feedstock powder and high temperature plasma jet was investigated. Furthermore, the deposition mechanism of EBC was studied. Experimental results dermonstrated that EBC with low porosity and good bonding can be obtained by PS-PVD. EBC withont micro-crack was observed on the surface of Si coating in contrast to coating mullite and Yb₂SiO₅ coating. The size of crack in mullite surface was larger than that in Yb₂SiO₅ coating. Low porous EBC was deposited by liquid droplet accompanied by gas and solid state through PS-PVD. Yb₂SiO₅ coating was dense and formed laminar structure, mainly resulting from liquid droplet deposition. Additionally, nano-grains were observed in Yb₂SiO₅ coating which resulted from both homogeneous and heterogeneous nucleation of vapor phase. And sub-micron/micron grains were obtained from semi-molten and splashed particles.

Key words: plasma spray-physical vapor deposition, environmental barrier coating, Yb₂SiO₅

CLC Number:

TQ174

ZHANG Xiao-Feng, ZHOU Ke-Song, LIU Min, DENG Chun-Ming, NIU Shao-Peng, XU Shi-Ming. Preparation of Si/Mullite/Yb₂SiO₅ Environment Barrier Coating (EBC) by Plasma Spray-Physical Vapor Deposition (PS-PVD)[J]. Journal of Inorganic Materials, 2018, 33(3): 325-330.

Figures/Tables 8

Fig. 1 Micrographs of (a) Si powders, (b) agglomerated mullite powders and (c) agglomerated Yb2SiO5 powders

Fig. 2 Surface SEM images of (a) original sample and (b) EBC sample

Fig. 3 SEM images of (a) cross-section of EBC, (b) interface of Yb2SiO5 and mullite coating, (c) interface of mullite and Si coating and (d) interface of Si and substrate

Fig. 4 XRD patterns of powders and coatings (a1) Mullite powders; (a2) Mullite coating; (b1) Yb2SiO5 powders; (b2) Yb2SiO5 coating

Fig. 5 Surface microstructures of EBC coating(a) Si coating; (b) Mullite coating; (c) Yb2SiO5 coating

Table 1 Coordination number, melting point and coefficient of thermal expansion of Si, 3Al2O3-2SiO2 and Yb2SiO5

Materials	Coordination number	Melting point /℃	Coefficient of thermal expansion at 100℃/×10^-⁶℃
C/SiC	-	2827	4.5-5.5
Si	4	1410	3.5-4.5
3Al₂O₃-2SiO₂	8	1830	6.5-7.0
Yb₂SiO₅	8	2000	6.8-7.3

Fig. 6 Micrographs of (a) mullite powders, (b, c) partial surface of mullite coating

Fig. 7 Schematic diagram of coating deposition by PS-PVD

References 18

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Preparation of Si/Mullite/Yb₂SiO₅ Environment Barrier Coating (EBC) by Plasma Spray-Physical Vapor Deposition (PS-PVD)

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