Microstructure and Nano-indentation of C/C Composites Modified with Multi-interlayers of SiC/TaC Ceramics Gradient Distribution

doi:10.11901/1005.3093.2015.144

Chinese Journal of Materials Research

2015, Vol. 29

Issue (11): 821-828 DOI: 10.11901/1005.3093.2015.144

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Microstructure and Nano-indentation of C/C Composites Modified with Multi-interlayers of SiC/TaC Ceramics Gradient Distribution

Zhaoke CHEN(

),Bin LI,Xiang XIONG

State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Cite this article:

Zhaoke CHEN,Bin LI,Xiang XIONG. Microstructure and Nano-indentation of C/C Composites Modified with Multi-interlayers of SiC/TaC Ceramics Gradient Distribution. Chinese Journal of Materials Research, 2015, 29(11): 821-828.

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Abstract

Multi-interlayers of SiC/TaC ceramics gradient distribution were inserted into C/C composites by means of chemical vapor infiltration (CVI) and controlling the flow direction of reaction gas in the porous C/C preforms. The results show that, along the thickness direction of C/C composites, the content of SiC/TaC ceramic phase and the thickness of the multi-interlayer are decreased, while the structure of the ceramic phase also changes from multi-interlayer (Region I) to composite interlayer (Region II) and then single interlayer (Region III). In Region I, the SiC/TaC multi-interlayer is composed of five interlayers: the first SiC layer, the second TaC layer, the third TaC composite interlayer embedded with SiC particles, the fourth SiC composite interlayer embedded with fine mosaic-like TaC phase and the fifth white TaC layer. In Region II, the ceramic phase does no longer coat on the surface of carbon fiber in form of an interlayer, but of a cauliflower-like cluster. At last, the nano-hardness and elastic modulus of SiC/TaC ceramic multi-interlayer in Region I were also discussed.

Key words: composites multi-interlayer nano-indentation gradient microstructure

Received: 19 March 2015

Fund: *Supported by National Key Basic Research and Development Program of China No. 2011CB605805.

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.144 OR https://www.cjmr.org/EN/Y2015/V29/I11/821

Fig.1 Microstructures of C/C preforms after infiltration of SiC/TaC multi-interlayers (a) and microstructures of regions I (b), II (c) and III (d)

Fig.2 Microstructures of C/C composites with gradient distributed SiC/TaC multi-interlayers (a) and microstructures of Regions I (b), II (c), III (d) and the tested zones of element content by electronic probe, with the diameter of beam spot of 100 μm

Fig.3 Microstructure of SiC/TaC multi-interlayer in Regions I (a) and II (b)

Fig.4 Content distribution of C, Ta, Si elements in Region I, II and III

Fig.5 Distribution of (a) C, (b) Si, (c) Ta elements in the SiC/TaC multi-interlayer

Fig.6 Schematic points of nanoindentation test in the SiC/TaC multi-interlayer in Region I and the corresponding hardness and Young’s modulus

Fig.7 Load-depth curve of each points in the SiC/TaC multi-interlayer in Region I

Fig.8 Maximum indentation depth and residual indentation depth of each point in the SiC/TaC multi-interlayer in Region I

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