Fabrication and oxidation resistance of silicon nitride fiber reinforced silica matrix wave-transparent composites

doi:10.1016/j.jmst.2019.05.068

Abstract

Abstract:

Wave-transparent ceramic matrix composites for the high temperature use should possess excellent oxidation resistance. In this work, Si₃N_4f/SiO₂ composites with different fiber content were fabricated by filament winding and sol gel method. The oxidation resistance was investigated by tracking the response of flexural strength to the testing temperature. The results show that the flexural strength and toughness of the composites with fiber content of over 37% can reach high levels at around 175.0?MPa and 6.2?MPa?m^1/2, respectively. After 1?h oxidation at 1100?°C, the flexural strength drops a lot but can still reach 114.4?MPa, which is high enough to ensure the safety of structures. However, when the oxidation temperature rises to 1200-1400?°C, the flexural strengths continue to fall to a relatively low level at 50.0-66.4?MPa. The degradation at high temperatures is caused by the combination of over strong interfacial bonding, the damage of fiber and the crystallization of silica matrix.

Key words: Si₃N_4f/SiO₂, Fiber content, Oxidation resistance, Mechanical property

Xuejin Yang, Bin Li, Duan Li, Changwei Shao, Changrui Zhang, Chunrong Zou, Kun Liu. Fabrication and oxidation resistance of silicon nitride fiber reinforced silica matrix wave-transparent composites[J]. J. Mater. Sci. Technol., 2019, 35(12): 2761-2766.

Figures/Tables 7

Fig. 1. (a) Density, open porosity and (b) pore size distribution of Si3N4f/SiO2 composites.

Fig. 2. IR spectra of silicon nitride fiber, silica matrix and Si3N4f/SiO2 composites with 37?vol.% fibers. Offsets have been applied for clarity.

Fig. 3. Flexural strength and fracture toughness of Si3N4f/SiO2 composites with different fiber content.

Fig. 4. Flexural strength and elastic modulus of the Si3N4f/SiO2 composite after oxidation at different temperatures. The fiber content is 37?vol.%.

Table 1 Contribution factor of the composites oxidized at different temperatures.

Oxidation temperature (°C)	σ_u (MPa)	σ_fu* (MPa)	V_f (%)	C
none	172.3	1200	37	0.393
1100	114.4	1116	37	0.281
1200	66.4	948	37	0.192

Fig. 5. Fracture surfaces of Si3N4f/SiO2 composites after oxidation at (a) 1100?°C, (b) 1200?°C, (c) 1300?°C and (d) 1400?°C. The fiber content is 37?vol.%.

Fig. 6. (a) XRD patterns and (b) IR spectra of Si3N4f/SiO2 composites oxidized at different temperatures for 1?h.

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