Effects of Multilayered Interfaces on Mechanical Damage of SiCf/SiC Composites

doi:10.15541/jim20230001

Abstract

Abstract:

SiC_f/SiC ceramic matrix composites have excellent prospects in aeroengine applications. Importantly, the interface design becomes a research focus. Multilayered interfaces can effectively improve the oxidation resistance of ceramic matrix composites, while their effect on the mechanical properties and damage mechanism are still unclear. Here, SiC_f/SiC minicomposites with BN and (BN/SiC)₃ interfaces were fabricated via the chemical vapor infiltration (CVI) method. Then, effect of multilayered interfaces on the failure mechanism of SiC_f/SiC composites was evaluated. According to the two kinds of mechanical experiments and acoustic emission (AE) detection, the damage mechanism of minicomposites was analyzed. Results indicate that the minicomposites prepared by CVI have an obvious interface structure and a dense matrix. The maximum load of BN and (BN/SiC)₃ minicomposites was 139 and 160 N, respectively. Besides, the two types of minicomposites possess typical load-displacement curves, and the damage processes of composites with different interfacial coatings exhibit various load-acoustic characteristics correspondingly. The AE characteristics of two mechanical loading tests can effectively assess the damage evolution of the minicomposites at each stage. In conclusion, multilayered interfaces can deflect cracks better, delay cracks extending to fibers, and thus improving mechanical properties of SiC_f/SiC composites.

Key words: multilayered interfaces, minicomposite, monotonic tensile, damage analysis, acoustic emission

CLC Number:

TQ174

SHEN Xuanyi, MA Qin, XUE Yudong, LIAO Chunjin, ZHU Min, ZHANG Xiangyu, YANG Jinshan, DONG Shaoming. Effects of Multilayered Interfaces on Mechanical Damage of SiC_f/SiC Composites[J]. Journal of Inorganic Materials, 2023, 38(8): 917-922.

Figures/Tables 9

Fig. 1 Schematic diagram of minicomposites

Table 1 Basic parameters of minicomposites

Sample	Density/ (g·cm^-3)	Porosity/%	Volume of fibre/%
C-1	2.55	11.3	33.29
C-2	2.71	9.8	31.32

Fig. 2 Schematic diagram of acoustic emission system

Fig. 3 Fracture morphologies and EDS analyses of minicomposites (a) C-1; (b) C-2,; (c) EDS of C-1; (d) EDS of C-2; Colorful figures are available on website

Fig. 4 Mechanical properties of minicomposites during monotonic tensile test (a) C-1; (b) C-2

Fig. 5 Tensile fracture morphologies of minicomposites (a, b) C-1; (c, d) C-2

Fig. 6 Nominal cumulative AE event number and energy relationship between single-value AE energy and load in monotonic tensile of minicomposites (a) C-1; (b) C-2; Colorful figures are available on website

Fig. 7 Mechanical properties of minicomposites during loading/unloading tensile tests (a) C-1; (b) C-2

Fig. 8 Nominal cumulative AE event number and energy during loading/unloading of minicomposites with BN and (BN/SiC)3 interfacial coatings and relationship between single-value AE energy and load (a) C-1; (b) C-2; Colorful figures are available on website

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