Fabrication of barium-strontium aluminosilicate coatings on C/SiC composites via laser cladding

Abstract

Abstract:

Barium-strontium aluminosilicate (BSAS) and Si/BSAS coatings were fabricated on the surface of C/SiC composites via a two-step laser cladding process. The microstructure, mechanical properties, and the water vapor corrosion behavior of the samples were investigated. The BSAS coating was found to be tightly bonded to the substrate and only a few pores and microcracks were observed. The introduction of a silicon middle layer was revealed to reduce thermal stress and promote the healing of defects formed during the laser cladding process. To evaluate the corrosion resistance, the BSAS and Si/BSAS-coated C/SiC composites were exposed to an atmosphere of 50% H₂O and 50% O₂ at 1250?°C. The resulting weight change and flexural strength were measured as a function of the corrosion time. The addition of the silicon middle layer below the BSAS top layer resulted in a better resistance to water vapor corrosion. Furthermore, the Si/BSAS-coated samples showed a lower weight loss and a smaller reduction in flexural strength than the BSAS-coated and the uncoated samples during water vapor corrosion. Thus, laser cladding is demonstrated to be an effective and feasible method to fabricate high-quality ceramic coatings on C/SiC composites. The introduction of a silicon middle layer can inhibit defect formation during the laser cladding process and protect the composite from water vapor corrosion.

Key words: Environmental barrier coating, Barium-strontium aluminosilicate, C/SiC composite, Laser cladding

Jiang Fengrui,Cheng Laifei,Zhang Jiaxin,Wang* Yiguang. Fabrication of barium-strontium aluminosilicate coatings on C/SiC composites via laser cladding[J]. J. Mater. Sci. Technol., 2017, 33(2): 166-171.

Figures/Tables 11

Fig. 1. TG-DTA curve obtained for the powder mixture used as raw material for the fabrication of the BSAS powder.

Fig.2. XRD pattern obtained for the BSAS powder after annealing at 1400?°C for 10?h

Fig. 3. (a) Surface morphology of the BSAS-coated C/SiC composite and (b) result of the corresponding EDS analysis.

Fig. 4. Cross-sectional morphologies of (a) the C/SiC composite without coating, (b) the BSAS-coated C/SiC composites, and (c) result of the EDS analysis performed on the BSAS coating.

Fig. 5. Variations of the weight of the uncoated C/SiC and the BSAS-coated C/SiC composite as a function of the corrosion time for the corrosion in water vapor at 1250?°C for up to 50?h.

Fig. 6. Variations of the flexure strength of the uncoated C/SiC and the BSAS-coated C/SiC composite as a function of the corrosion time for the corrosion in water vapor at 1250?°C for up to 50?h.

Fig. 7. Cross-section of the corroded composite samples after corrosion in water vapor at 1250?°C for 50?h: (a) uncoated C/SiC, (b) BSAS-coated C/SiC.

Fig. 8. (a) Surface morphology of the Si/BSAS-coated C/SiC composite and (b) result of the corresponding EDS analysis.

Fig. 9. (a) Cross-sectional morphology of the Si/BSAS-coated C/SiC composites and results of the EDS analysis: (b) BSAS layer, (c) Si layer.

Fig. 10. Variation of the weight (a) and the flexural strength (b) of the Si/BSAS-coated C/SiC composite as a function of the corrosion time for the corrosion in water vapor at 1250?°C for up to 50?h.

Fig. 11. Cross-section of a Si/BSAS-coated C/SiC composite sample corroded in water vapor at 1250?°C for 50?h.

References

[1]	S. Schmidt, S. Beyer, H. Knabe, H. Immich, R. Meistring, A. Gessler,Acta Astronaut, 55(2004), pp. 409-420
[2]	H. Kaya,Compos. Sci. Technol, 59(1999), pp. 861-872
[3]	S. Tang, C. Hu,J. Mater. Sci. Technol (
[4]	N.S. Jacobson, E.J. Opila, K.N. Lee,Curr. Opin. Solid State Mater. Sci, 5(2001), pp. 301-309
[5]	D.S. Fox,J. Am. Ceram.Soc, 81(1998), pp. 945-950
[6]	N.S. Jacobson,J. Am. Ceram.Soc, 76(1993), pp. 3-28
[7]	Y.G. Wang, W.F. Fei, L.N. An,J. Am. Ceram.Soc, 89(2006), pp. 1079-1082
[8]	E.J. Opila, R.E. Hann,J. Am. Ceram.Soc, 80(1997), pp. 197-205
[9]	K.N. Lee,Surf. Coat. Technol,133-134(2000), pp. 1-7
[10]	H.E. Eaton, G.D. Linsey,J. Eur. Ceram.Soc, 22(2002), pp. 2741-2747
[11]	K.N. Lee, R.A. Miller,Surf. Coat. Technol, 86(1996), pp. 142-148
[12]	Y. Wang, Y. Wu, L. Cheng, L. Zhang,J. Am. Ceram.Soc, 93(2010), pp. 204-208
[13]	K.N. Lee, D.S. Fox, J.I. Eldridge, D. Zhu, R.C. Robinson, N.P. Bansal, R.A. Miller,J. Am. Ceram.Soc, 86(2003), pp. 1299-1306
[14]	Y. Wang, J. Liu,Corros. Sci, 51(2009), pp. 2126-2129
[15]	K.N. Lee, D.S. Fox, N.P. Bansal,J. Eur. Ceram.Soc, 25(2005), pp. 1705-1715
[16]	Z. Hong, L. Cheng, L. Zhang, Y. Wang,J. Am. Ceram.Soc, 92(2009), pp. 193-196
[17]	Y. Wang, J. Liu,J. Eur. Ceram.Soc, 29(2009), pp. 2163-2167
[18]	R.P. Mulpuri, V.K. Sarin,J. Mater.Res, 11(1996), pp. 1315-1324
[19]	K.N. Lee, R.A. Miller, N.S. Jacobson,J. Am. Ceram.Soc, 78(1995), pp. 705-710
[20]	J. Liu, L. Zhang, Q. Liu, L. Cheng, Y. Wang,J. Am. Ceram.Soc, 93(2010), pp. 4148-4152
[21]	W. Liu, Y. Hou, C. Liu, Y. Wang, R. Jiang, G. Xu,Surf. Coat. Technol, 270(2015), pp. 33-38
[22]	F. Liu, Y. Ji, Q. Meng, Z. Li,Vacuum, 133(2016), pp. 31-37
[23]	F. Weng, C. Chen, H. Yu,Mater. Des, 58(2014), pp. 412-425
[24]	W.M. Steen, K.G. Watkins,J. Phys, IV (3C9) (1993) C9-581-C9-590
[25]	I. Smurov,Surf. Coat. Technol, 202(2008), pp. 4496-4502
[26]	G. Chryssolouris, S. Zannis, K. Tsirbas, C. Lalas,CIRP Ann. Manuf. Technol, 51(2002), pp. 145-148
[27]	K. Chiu, F. Cheng, H. Man,Mater. Sci. Eng. A, 402(2005), pp. 126-134
[28]	F. Lusquiños, J. Pou, F. Quintero, M. Pérez-Amor,Surf. Coat. Technol, 202(2008), pp. 1588-1593
[29]	Y. Chen, D. Wu, G. Ma, W. Lu, D. Guo,Surf. Coat. Technol, 228 (Supplement 1) (2013), pp. S452-S455
[30]	C. Tan, H. Zhu, T. Kuang, J. Shi, H. Liu, Z. Liu,J. Alloys Compd, 690(2017), pp. 108-115
[31]	F. Arias-Gonzáleza, J. del Vala, R. Comesañab, J. Penidea, F. Lusquiñosa, F. Quinteroa, A. Riveiroa, M. Boutinguizaa, J. Poua,Appl. Surf. Sci, 374(2016), pp. 197-205
[32]	Z. Hong, L. Cheng, L. Zhang, Y. Wang,J. Am. Ceram.Soc, 92(2009), pp. 193-196
[33]	C. Zhao,Light Met, 12(2004), pp. 10-12 (in Chinese)
[34]	Y. Kobayashi, M. Inagaki,J. Eur. Ceram.Soc, 24(2004), pp. 399-404
[35]	Y.P. Fu, C.C. Chang, C.H. Lin, T.S. Chin,Ceram. Int, 30(2004), pp. 41-45
[36]	H.O. Pierson,Handbook of Refractory Carbides and Nitrides
[36]	Elsevierence (1996)
[37]	R. Jendrzejewski, G. Śliwiński, M. Krawczuk, W. Ostachowicz,Surf. Coat. Technol, 201(2006), pp. 3328-3334
[38]	Y. Xu, Z. Yan,J. Rare Earths, 28(2010), pp. 399-402
[39]	K.A. Terrani, B.A. Pint, C.M. Parish, C.M. Silva, L.L. Snead, K. Yutai,J. Am. Ceram.Soc, 97(2014), pp. 2331-2352
[40]	K.L. More, P.F. Tortorelli, M.K. Ferber, J.R. Keiser,J. Am. Ceram.Soc, 83(2000), pp. 211-213