Effect of SiC Transition Layer on Bonding Properties of MoSi2-SABB Coating on SiC/SiC Ceramic Matrix Composites

doi:10.15541/jim20240538

Abstract

Abstract:

SiC/SiC ceramic matrix composites (SiC/SiC CMCs) are expected to be used in the thermal protection system of reusable aerospace vehicles due to their advantages of high temperature resistance, low density and high strength. Given the complex and harsh working environment of aerospace vehicles, it is urgent to develop a high-temperature anti-oxidation sealing coating on the surface of SiC/SiC CMCs to meet the requirements for reusability. In this work, a SiC transition layer was designed and prepared on the surface of SiC/SiC CMCs by chemical vapor deposition (CVD), which is supposed to solve the cracking and spalling problems of the MoSi₂-doped SiO₂-Al₂O₃-BaO-B₂O₃ (MoSi₂-SABB) glass-ceramic composite coating, and enable the coating to exhibit excellent thermal shock resistance. Finite element analysis showed that the SiC transition layer could effectively reduce the residual stress at the interface between the MoSi₂-SABB coating and the substrate, alleviate anisotropy of the residual stress, and significantly improve bonding performance of the coating. This binding mechanism of SiC transition layer with different crystal structures and polarities and MoSi₂-SABB coating was investigated by the first principles calculation. The results showed that crystal structure and polarity of SiC transition layer were key factors affecting the coating bonding performance, providing a basis for design and optimization of bonding performance for surface sealing coating of SiC/SiC CMCs.

Key words: SiC/SiC ceramic matrix composite, SiC transition layer, glass-ceramic composite coating, bonding performance

CLC Number:

TQ174

CAO Luhan, MENG Jia, XUE Yudong, SHENG Xiaochen, CUI Yuanyuan, LE Jun, SONG Lixin. Effect of SiC Transition Layer on Bonding Properties of MoSi₂-SABB Coating on SiC/SiC Ceramic Matrix Composites[J]. Journal of Inorganic Materials, 2025, 40(10): 1119-1128.

Figures/Tables 14

Table 1 Thermophysical properties of the relevant materials

Sample	Temperature, T/℃	Density, ρ/(kg·m⁻³)	Elastic modulus/GPa	Poisson’s ratio	Thermal expansion coefficient, α/ (×10⁻⁶, K^-1)	Thermal conductivity/ (W·m^-1·K^-1)	Specific heat capacity/ (J·kg^-1·K^-1)
MoSi₂-SABB coating	25	2192	33.370	0.208	3.30	1.130	716
	100	-	33.805	0.208	3.30	1.206	789
	200	-	34.125	0.208	3.51	1.277	883
	300	-	34.499	0.208	3.66	1.368	975
	400	-	34.824	0.208	3.70	1.475	1068
	500	-	34.861	0.208	3.64	1.702	1159
	600	-	35.246	0.208	3.59	1.849	1252
CMCs	25	2600	150	0.130	2.929	4.83	759
	200	-	150	0.130	4.128	/	706
	400	-	150	0.130	3.880	/	299
	600	-	150	0.130	3.831	/	410
	800	-	150	0.130	4.124	4.68	805
	1000	-	150	0.130	4.157	4.57	963
SiC layer^[22-23]		3200	340	0.142	4.0	39	700

Fig. 1 Schematic diagram of atoms at the interface according to interface model

Fig. 2 Surface morphologies and structures of CMCs substrates before and after preparation of the SiC transition layer, along with morphology of the MoSi2-SABB coating prepared on its surface (a-d) SEM images of (a) CMCs, (b) CMCs/MoSi2-SABB coating, (c) CMCs/SiC, and (d) CMCs/SiC/MoSi2-SABB coating; (e) Surface profile curves of CMCs and CMCs/SiC; (f) Surface 3D profile curves of CMCs/SiC

Fig. 3 Curves of temperature and residual stress at peaks and valleys of MoSi2-SABB coating interfaces in CMCs/MoSi2- SABB and CMCs/SiC/MoSi2-SABB models (a) Radial stress; (b) Axial stress

Fig. 4 Radial stress (a, b) and axial stress (c, d) of coating interface of CMCs/MoSi2-SABB (a, c) and CMCs/SiC/MoSi2-SABB (b, d) S11: radial stress; S22: axial stress. Colorful figures are available on website

Fig. 5 (a, b) Surface and (c, d) cross-sectional SEM images of CMCs/SiC/MoSi2-SABB coating before (a, c) and after (b, d) thermal shock cycle

Fig. 6 Macroscopic morphologies of MoSi2-SABB coatings on the surface of three SiC transition layers prepared by different CVD processes (a) 1# sample; (b) 2# sample; (c) 3# sample

Fig. 7 SEM, AFM and water contact angle images of the surface of 1#-3# CMCs/SiC substrates (a) 1# CMCs/SiC; (b) 2# CMCs/SiC; (c) 3# CMCs/SiC

Fig. 8 XRD patterns of CMCs and 1#-3# CMCs/SiC surfaces

Table 2 Adhesion strength of 6H-SiC, 3C-SiC and MoSi2, SiO2 interfaces

W_sep/(J·m^-2)	6H-SiC/ MoSi₂	6H-SiC/ SiO₂	3C-SiC/ MoSi₂	3C-SiC/ SiO₂
Si termination	3.64	6.67	2.91	4.79
C termination	4.80	1.60	7.41	0.49

Fig. 9 SEM images of MoSi2-SABB coatings on the surfaces of 1#-3# CMCs/SiC (a) 1# CMCs/SiC; (b) 2# CMCs/SiC; (c) 3# CMCs/SiC

Fig. 10 Force analysis of MoSi2-SABB coating

Fig. 11 SEM images of MoSi2-SABB coating on 2# CMCs/SiC substrate before (a) and after (b) modification of glass

Fig. 12 Softening temperature before and after modification of SABB glass

References 30

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Effect of SiC Transition Layer on Bonding Properties of MoSi₂-SABB Coating on SiC/SiC Ceramic Matrix Composites

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