Effect of BN/SiC Multilayered Interphases on Mechanical Properties of SiC Fibers and Minicomposites by PIP

doi:10.15541/jim20190646

Abstract

Abstract:

BN and BN/SiC interphases were deposited on the surface of SiC fibers by CVI process, and the mechanical properties of the as-received and coated fibers were evaluated. SiC_f/SiC minicomposites were prepared by PIP using the as-received, BN-coated and BN/SiC coated fiber bundles as reinforcements. The effects of interphases on the mechanical properties of the composites were studied. The results show that the interphases prepared by CVI process are uniform and compact. The deposited BN interphase contains hexagonal phases with small crystal size (1.76 nm). The deposited SiC interphase has better crystallinity and larger grain size (18.73 nm) than BN interphase. The elastic modulus of coated SiC fibers shows basically no change, but the tensile strength decreases. The maximum tensile load and fracture strain of SiC_f/ BN/SiC and SiC_f/(BN/SiC)/SiC minicomposites are significantly increased, in comparison to SiC_f/SiC minicomposites. It can be seen from the cross-sections of SiC_f/BN/SiC and SiC_f/(BN/SiC)/SiC mini-composites that the fibers with interphases pull out obviously relative to SiC_f/SiC mini-composites, and the BN interphases played a reinforcing role in the tensile fracture process of the composites. The composites with interphases exhibit obvious fiber pull-out resulting in more energy consumption during the fracture, so that the composite can endure more load.

Key words: BN/SiC multilayered interphase, Mini-SiC_f/SiC composites, maximum tensile load, fracture strain

CLC Number:

TB332

LÜ Xiaoxu, JIANG Zhuyu, ZHOU Yiran, QI Zhe, ZHAO Wenqing, JIAO Jian. Effect of BN/SiC Multilayered Interphases on Mechanical Properties of SiC Fibers and Minicomposites by PIP[J]. Journal of Inorganic Materials, 2020, 35(10): 1099-1104.

Figures/Tables 9

Table 1 The linear density of Mini-composites after different PIP cycles

Linear density (g·m^-1) Sample	PIP cycle
Linear density (g·m^-1) Sample	0	1	2	3	4	5
SiC_f/SiC	(0.303±0.028)	(1.26±0.11)	(1.30±0.14)	(1.32±0.17)	(1.33±0.12)	(1.33±0.13)
SiC_f/BN/SiC	(0.330±0.023)	(1.31±0.10)	(1.34±0.11)	(1.35±0.15)	(1.36±0.10)	(1.36±0.13)
SiC_f/(BN/SiC)/SiC	(0.346±0.035)	(1.25±0.08)	(1.28±0.11)	(1.30±0.15)	(1.30±0.14)	(1.31±0.10)

Fig. 1 SEM and EDS microstructures of fibers with different interphases (a, b) As-received; (c, d) BN-coated; (e, f) BN/SiC-coated

Fig. 2 XRD patterns of BN (a) and BN/SiC (b) interphase

Fig. 3 HRTEM microstructures of different interphases (a) BN interphase; (b) SiC interphase

Fig. 4 Tensile strength of SiC fibers with different interphases (a) Tested strength value; (b) Calculated strength value after deducting the thickness of interphases

Fig. 5 Elastic modulus of SiC fibers with different interphases

Fig. 6 XRD pattern of the pyrolysis products from VHPCS at 1100 ℃

Fig. 7 Cross-section morphologies of mini-SiCf/SiC composites with different interphases (a) No interphase, (b) BN interphase, (c) BN/SiC interphase

Fig. 8 The load-strain curves of Mini-SiCf/SiC composites

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