Mechanical Properties and Oxidation Behaviors of Self-Healing SiCf/SiC-SiBCN Composites Exposed to H2O/O2/Na2SO4 Environments

doi:10.1007/s40195-023-01596-7

Abstract

Abstract:

The oxidation behaviors and their influence on the mechanical properties of self-healing SiC_f/SiC-SiBCN composites were investigated in H₂O/O₂ and H₂O/O₂/Na₂SO₄ environments at 1200‒1350 °C for 100 h. As the temperatures increase from 1200 to 1350 °C, the oxidation rate constants increase from 0.45 × 10^-7 to 1.58 × 10^-7 mg²/(mm⁴ h) in H₂O/O₂, and from 1.02 × 10^-7 to 3.42 × 10^-7 mg²/(mm⁴ h) in H₂O/O₂/Na₂SO₄. The involvement of Na₂SO₄ leads to the formation of a loose lamellar oxide layer, the breakage of the SiBCN/CVI-SiC interface and the decrease in the oxide viscosity, thus accelerating the oxidation of the composites. The composites show the maximum retention rate of strength (102%, 535.71 MPa) after oxidation in H₂O/O₂ at 1200 °C due to the good self-healing capacity of the produced glass, while the minimum (82%, 430.56 MPa) in H₂O/O₂/Na₂SO₄ at 1350 °C caused by the severe microstructural corrosion derived from Na₂SO₄.

Key words: SiC_f/SiC-SiBCN composite, Mechanical property, Oxidation, Chemical vapor infiltration and polymer infiltration and pyrolysis (CVI-PIP), Self-healing

Suya Ji, Bin Liang, Chenglong Hu, Shengyang Pang, Rida Zhao, Jian Li, Sufang Tang. Mechanical Properties and Oxidation Behaviors of Self-Healing SiC_f/SiC-SiBCN Composites Exposed to H₂O/O₂/Na₂SO₄ Environments[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(11): 1909-1923.

Figures/Tables 16

Table 1 Properties of the SiC fibers

Diameter (μm)	Density (g/cm³)	Tensile strength (GPa)	Young’s modulus (GPa)	Elemental composition (at.%)
Diameter (μm)	Density (g/cm³)	Tensile strength (GPa)	Young’s modulus (GPa)	Si	C	O
12	2.66	2.95	280	40.71	57.72	1.57

Table 2 Densities and open porosities of the semi-dense SiCf/SiC and dense SiCf/SiC-SiBCN composites

	Density (g/cm³)	Open porosity (%)
Semi-dense SiC_f/SiC	2.21 ± 0.04	24.91 ± 0.95
Dense SiC_f/SiC-SiBCN	2.60 ± 0.02	5.25 ± 0.35

Fig. 1 a SEM images, b EDS analysis, c Raman spectrum and d XRD pattern for the surface of as-prepared SiCf/SiC-SiBCN composites

Fig. 2 a and b SEM images for the cross section of as-prepared SiCf/SiC-SiBCN composites; c Si mapping corresponding to b

Fig. 3 Curves of specific mass gain versus oxidation time in different oxidizing atmospheres at a 1200 °C, b 1350 °C for the SiCf/SiC-SiBCN composites

Fig. 4 XRD patterns for the surface of the SiCf/SiC-SiBCN composites after 100 h oxidation at different atmospheres and temperatures

Fig. 5 Surface morphologies of the SiCf/SiC-SiBCN composites after 100 h oxidation: a 12HO; b 12HON; c 13HO; d 13HON

Fig. 6 SEM images for the oxide layer of the SiCf/SiC-SiBCN composites after 100 h oxidation: a 12HO; b 12HON; c 13HO; d 13HON

Fig. 7 SEM images of the surface of SiBCN matrix after 100 h oxidation: a 12HO; b 12HON; c 13HO; d 13HON

Fig. 8 Interfacial morphologies between SiBCN and SiC matrix, and their EDS analyses after 100 h oxidation in a 12HO, b 13HO

Fig. 9 Interfacial morphologies between SiBCN and SiC matrix, and their EDS analyses after 100 h oxidation in a 12HON, b 13HON

Fig. 10 Specific mass gain as a function of oxidation time at a 1200 °C, b 1350 °C for the SiCf/SiC-SiBCN composites

Table 3 Flexural strengths and strength retention rates of the SiCf/SiC-SiBCN composites after oxidation for 100 h in H2O/O2 and H2O/O2/Na2SO4 environments at 1200 °C and 1350 °C

Temp. (°C)	Atmosphere	Flexural strength (MPa)	Strength retention rate (%)
Room temp.	-	526.93 ± 17.63	-
1200	H₂O/O₂	535.71 ± 23.42	102
1200	H₂O/O₂/Na₂SO₄	477.27 ± 28.73	91
1350	H₂O/O₂	496.28 ± 22.60	94
1350	H₂O/O₂/Na₂SO₄	430.56 ± 26.42	82

Fig. 11 Flexural stress-displacement curves of the SiCf/SiC-SiBCN composites before and after 100 h oxidation at 1200 °C, 1350 °C: a H2O/O2; b H2O/O2/Na2SO4

Fig. 12 Fracture morphologies of the SiCf/SiC-SiBCN composites after oxidation for 100 h: a 12HO; b 12HON; c 13HO; d 13HON

Fig. 13 SEM images showing the fracture morphologies of PyC interphases between SiC fibers and SiC matrix after oxidation for 100 h: a 12HO; b 12HON; c 13HO; d 13HON

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Mechanical Properties and Oxidation Behaviors of Self-Healing SiC_f/SiC-SiBCN Composites Exposed to H₂O/O₂/Na₂SO₄ Environments

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