Effect of C/SiC Volume Ratios on Mechanical and Oxidation Behaviors of Cf/C-SiC Composites Fabricated by Chemical Vapor Infiltration Technique

doi:10.1007/s40195-022-01375-w

Abstract

Abstract:

C/SiC volume ratios in carbon fiber-reinforced carbon-silicon carbide (C_f/C-SiC) composites may influence greatly mechanical and oxidation properties of the composites, but have not been well investigated yet. Herein, C_f/C-SiC composites with different C/SiC volume ratios were fabricated by chemical vapor infiltration (CVI) technique through alternating the thickness of a pyrocarbon (PyC) interlayer. The composites with C/SiC volume ratios of 0.37 and 0.84 exhibited the better comprehensive mechanical properties. The CS0.37 showed the highest flexural strength of 340.6 MPa, and CS0.84 had the maximum tensile strength of 139.1 MPa. The excellent mechanical properties were closely related to the relatively low C/SiC volume ratios and porosities, optimum interfacial bonding and reduced matrix micro-cracks. The composite with a low C/SiC volume ratio of 0.10 showed the best anti-oxidation performance due to its high SiC content. The oxidation mechanisms at 1100 °C and 1400 °C were discussed by considering the effect of the C/SiC volume ratios, pores and matrix micro-cracks, oxidation of carbon phase and SiC.

Key words: C_f/C-SiC composites, Chemical vapor infiltration, Mechanical properties, Oxidation properties

Jinjin Yao, Shengyang Pang, Yuanhong Wang, Chenglong Hu, Rida Zhao, Jian Li, Sufang Tang, Hui-Ming Cheng. Effect of C/SiC Volume Ratios on Mechanical and Oxidation Behaviors of C_f/C-SiC Composites Fabricated by Chemical Vapor Infiltration Technique[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(5): 801-811.

Figures/Tables 10

Fig. 1 Cross-sectional morphologies of the Cf/C-SiC composites with different C/SiC volume ratios, a CS0.10, b CS0.84, c CS3.46. The insets show the magnified images between inter-fiber regions

Table 1 Density, porosity, open porosity and mechanical properties of the Cf/C-SiC composites with different C/SiC volume ratios

Specimens	Density (g·cm^-3)	Porosity (%)	Open porosity (%)	SiC content (%)	Flexural strength (MPa)	Tensile strength (MPa)	Compressive strength (MPa)	Fracture toughness (MPa·m^1/2)
CS0.10	2.00	23.3	22.6	43.6	291.6 ± 20.1	93.3 ± 9.8	247.3 ± 26.3	11.2 ± 2.2
CS0.37	1.98	21.0	18.5	36.8	340.6 ± 30.4	107.2 ± 19.5	247.4 ± 8.0	-
CS0.84	1.87	21.6	18.1	27.1	295.5 ± 17.2	139.1 ± 35.7	246.2 ± 13.5	-
CS1.60	1.84	19.7	15.4	19.9	262.1 ± 46.9	119.0 ± 13.2	222.2 ± 9.1	15.6 ± 2.5
CS3.46	1.78	18.7	14.2	11.8	283.6 ± 13.7	98.6 ± 23.4	209.4 ± 12.6	-

Fig. 2 a Flexural, b tensile, c compressive stress-displacement curves of the Cf/C-SiC composites

Fig. 3 Fracture morphologies of the Cf/C-SiC composites with different C/SiC volume ratios and their magnification images: a CS0.10, b CS0.37, c CS3.46

Fig. 4 Flexural modulus of the Cf/C-SiC composites with different C/SiC volume ratios

Fig. 5 Specific weight loss of Cf/C-SiC composites with different C/SiC volume ratios at 1100 °C and 1400 °C for 1500 s in air

Fig. 6 Linear and bilogarithmic plots of the specific weight loss versus oxidation time of a, b CS0.10, c, d CS0.84, e, f CS3.46

Fig. 7 Surface morphologies of CS0.10 after oxidation for 1500 s at a 1100 °C, b 1400 °C

Fig. 8 XRD patterns of the surface of CS0.10 after oxidation for 1500 s at 1100 °C and 1400 °C

Fig. 9 Cross-sectional morphologies of the Cf/C-SiC composites after 1500 s oxidation at 1100 °C and 1400 °C: a CS0.10-1100 °C, b CS0.10-1400 °C, c CS0.84-1400 °C, d CS3.46-1400 °C

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