Preparation and interface modification of Si3N4f/SiO2 composites

doi:10.1016/j.jmst.2019.05.069

Abstract

Abstract:

In order to modify the interface, SiON coating was introduced on the surface of silicon nitride fiber by perhydropolysilazane conversion method. Si₃N_4f/SiO₂ and Si₃N_4f/SiON_c/SiO₂ composites were prepared by sol-gel method to explore the influence of SiON coating on the mechanical properties of composites. The results show that with the protection of SiON coating, Si₃N₄ fiber enjoys a strength increase of up to 24.1% and Si₃N_4f/SiON_c/SiO₂ composites have a tensile strength of 170.5?MPa and a modulus of 26.9?GPa, respectively. After 1000?°C annealing in air for 1?h, Si₃N_4f/SiON_c/SiO₂ composites retain 65.0% of their original strength and show a better toughness than Si₃N_4f/SiO₂ composites. The improvement of mechanical properties is attributing to the healing effect of SiON coating as well as its intermediate coefficient of thermal expansion between Si₃N₄ fiber and SiO₂ matrix.

Key words: Si₃N₄ fiber, Perhydropolysilazane, SiON coating, Interface, Mechanical properties

Yubo Hou, Xuejin Yang, Bin Li, Duan Li, Shitao Gao, Zhongshuai Wu. Preparation and interface modification of Si₃N_4f/SiO₂ composites[J]. J. Mater. Sci. Technol., 2019, 35(12): 2767-2771.

Figures/Tables 7

Fig. 1. XRD patterns of (a) SiO2 fiber and (b) Si3N4 fiber at different temperatures.

Fig. 2. Surface morphologies of SiO2 fiber (a) as-received, (b) after annealing at 800?°C, (c) after annealing at 1200?°C, and Si3N4 fiber (d) as-received, (e) after annealing at 1000?°C, (f) after annealing at 1200?°C.

Fig. 3. Tensile strength of the coated and uncoated Si3N4 fiber after annealing at different temperatures for 1?h.

Fig. 4. FT-IR spectra of Si3N4f/SiO2 and SiO2f/SiO2 composites.

Fig. 5. XPS spectra of Si3N4f/SiO2 composites: (a) overall spectrum, (b) Si2p, (c) O1s, (d) N1s.

Fig. 6. Load-displacement curves of (a) Si3N4f/SiO2 and (b) Si3N4f/SiONc/SiO2 composites annealed at different temperatures for 1?h.

Table 1 Mechanical properties of Si3N4f/SiO2, Si3N4f/SiONc/SiO2 and SiO2f/SiO2 composites annealed at different temperatures for 1?h.

Composites	Anneal temperature (°C)	Tensile strength (MPa)	Retention of strength (%)	Tensilemodulus (GPa)	Retention of modulus (%)
Si₃N_4f/SiO₂	As-produced	147.2	100	27.6	100
	1000?°C	95.0	64.5	16.4	62.1
	1200?°C	57.6	39.1	8.2	31.1
Si₃N₄/SiON_c/SiO₂	As-produced	170.5	100	26.9	100
	1000?°C	111.9	65.0	13.7	50.5
	1200?°C	46.0	27.0	2.52	14.8
SiO_2f/SiO₂	As-produced	162.4	100	19.1	100
	1000?°C	83.5	51.4	9.9	51.7
	1200?°C	28.5	17.6	3.4	17.9

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Preparation and interface modification of Si₃N_4f/SiO₂ composites

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