Microstructure and Fatigue Behavior of High Texture Three-dimensional C/C Composites Prepared by Mixed Precursors

doi:10.15541/jim20190364

Abstract

Abstract:

Three-dimensional five-way braided C/C composites were prepared by chemical vapor infiltration using ethanol and methane as precursors. Their microstructure of the composites was analyzed by polarizing microscope. The static bending properties and fatigue behavior of prepared composites were investigated. Effects of loading cycles on bending strength and mechanical behavior of the prepared composites were studied. Results show that high texture C/C composites can be successfully fabricated by using mixed precursors. Average bending strength of the composites is 379.2 MPa, and their fatigue limit is 80.3% of the static bending load. Under cyclic loading, the flexural strength of C/C composites increases in different cycles. The bending strength is increased by 16.8% after 10 ⁵ cycles. "Yield zone" of the bending bearing capacity of the material increases firstly and then decreases with the increase of the cyclic loading, which is related to the bonding state of fiber-matrix and matrix-matrix in the fatigue process.

Key words: C/C composite, high texture, fatigue behavior

CLC Number:

TQ332

YAO Xiyuan, LI Kezhi, REN Junjie, ZHANG Shouyang. Microstructure and Fatigue Behavior of High Texture Three-dimensional C/C Composites Prepared by Mixed Precursors[J]. Journal of Inorganic Materials, 2020, 35(5): 589-592.

Figures/Tables 6

Fig. 1 PLM images of 3D C/C composites (a) Fiber bundle morphology; (b) Microstructure of high texture pyrolytic carbon

Fig. 2 Three point bending stress-strain curves of 3D braided C/C composites

Fig. 3 S-N diagram of 3D braided C/C composites under flexural fatigue

Table 1 Increasing amplitude of flexural strength of 3D C/C composites after different cyclic loading

Cycles	0	25000	10⁵	10⁶
Strength /MPa	379.2	431.9	443.0	412.7
Strength increase /%	0	13.9	16.8	8.9

Fig. 4 Bending stress-strain curves of C/C composites after different fatigue cyclic loading (a) n=0; (b) n=25000; (c) n=105; (d) n=106

Fig. 5 Fracture morphologies of high texture 3D C/C composites after different fatigue cyclic loading (a) n=0; (b) n=25000; (c) n=105; (d) n=106

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