Interface Type on the Static Mechanical Properties and Internal Friction of 3D-SiC/SiC Composites

doi:10.15541/jim20200272

Abstract

Abstract:

Microstructure and static mechanical properties of 3D-SiC/SiC composites with different interfaces, such as PyC, SiC and PyC/SiC and without an interface were prepared via polymer infiltration and pyrolysis, and effect of interface type on the internal friction was investigted by means of forced vibration. The results showed that the microstructure and static mechanical properties of SiC/SiC composites with an interphase layer were superior to the composites without an interlayer, and the former also showed a lower internal friction than the later. The sub-layer SiC of the PyC/SiC interface limits the binding state and the plastic deformation of PyC interphase, beneficial to improving the mechanical properties of SiC/SiC composite. Meanwhile, The interface layer of SiC/SiC composites has a significant effect on the internal friction behavior, with interfacial shear strength inversely proportional to the internal friction. By comparing the change rate of internal friction of composites at 50 and 350 ℃, the overall trend of internal friction decreases with the increase of interfacial shear strength. In addition, as compared with the composite with PyC interface, the composite with PyC/SiC interface has a lower change rate of the internal fiction, indicating that PyC/SiC interface of SiC/SiC composites is more helpful for high temperature vibration environment.

Key words: SiC/SiC compsite, interphase, internal friction, mechanical property

CLC Number:

TB332

MA Denghao, HOU Zhenhua, LI Junping, SUN Xin, JIN Enze, YIN Jian. Interface Type on the Static Mechanical Properties and Internal Friction of 3D-SiC/SiC Composites[J]. Journal of Inorganic Materials, 2021, 36(1): 55-60.

Figures/Tables 8

Fig. 1 Preparation process of the 3D SiCf/SiC composites with various interphase

Fig. 2 Cross-sectional SEM images of the composites with different interface layers (a) S1; (b) S2; (c) S3; (d) S4

Fig. 3 Interface shear strength and fracture toughness, flexural strength of the composites with different interface layers

Fig. 4 Temperature dependence of internal friction in SiC/SiC composite with different interface layers

Fig. 5 Internal friction of SiC/SiC composites with different interface layers as a function of frequency

Fig. 6 Internal friction vs strain amplitude in SiC/SiC composites with different interface layers

Fig. 7 Internal friction at 50 ℃ and 325 ℃ as a function of interface shear strength

Fig. 8 Change rate of internal friction at 50℃ and 325℃ as a function of interface shear strength

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