Microstructure and mechanical properties of SiC<sub>f</sub>/SiBCN ceramic matrix composites

doi:10.1007/s40145-015-0128-2

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Abstract

SiC fiber reinforced SiBCN ceramic matrix composites (CMCs) have been prepared by mechanical alloying and consolidated by hot pressing. During the sintering process, amorphous SiC fibers crystallized seriously and transformed into β-SiC. Meanwhile, the interfacial carbothermal reactions caused the strong bonding between the matrix and fibers. As a result, SiC_f/SiBCN fractured in a typical catastrophic manner. Room-temperature mechanical properties reached the maximums for the CMC samples sintered at 1900 ℃/60 MPa/30 min. The density, flexural strength, Young’s modulus and fracture toughness are 2.56±0.02 g/cm³, 284.3±17.9 MPa, 183.5±11.1 GPa and 2.78±0.14 MPa·m^1/2, respectively.

Key words： hot pressing composites mechanical properties fiber

Received: 29 August 2014 Published: 04 June 2015

Corresponding Authors: Dechang JIA

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	Jiaying WANG
	Zhihua YANG
	Xiaoming DUAN
	Dechang JIA
	Yu ZHOU

Cite this article:

Jiaying WANG,Zhihua YANG,Xiaoming DUAN, et al. Microstructure and mechanical properties of SiC_f/SiBCN ceramic matrix composites[J]. Journal of Advanced Ceramics, 2015, 4(1): 31-38.

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http://jac.tsinghuajournals.com/EN/10.1007/s40145-015-0128-2 OR http://jac.tsinghuajournals.com/EN/Y2015/V4/I1/31

Parameters of SLFC1 SiC fibers adopted in the current research

Sintering method and serial number of SiC_f/SiBCN composite specimens

(a) XRD analysis of raw powder mixture and as-milled amorphous SiBCN powder; (b) and (c) surface morphology of SiBCN powder by mechanical alloying process.

XRD analysis of SiC_f/SiBCN composites under different sintering conditions.

(a) Bright field image and SAED pattern (inset) of SiC_f/SiBCN CMCs prepared at 1900 ℃/60 MPa/60 min; (b) and (c) microstructures and EDX analysis of SiC fibers in SiC_f/SiBCN composites prepared at 1800 ℃/60 MPa/30 min in different areas.

Layer-fractured phenonemon in the SiC_f/SiBCN composites prepared at 1900 ℃/60 MPa/30 min and 60 min: (a) pits in the center of SiC fibers; (b) thickness of react layer; (c) protrusions in the center of SiC fibers; (d) morphology of fractured surface prepared at 1900 ℃/ 60 MPa/60 min.

Uniform distribution of carbon in the adjacent area of fibers: (a) electron back-scattered diffraction (EBSD) analysis of SiC_f/SiBCN composite surface; (b) line scanning in Fig. 5(a).

Schematic of carbon diffusion and layer-fractured phenomenon in the SiC_f/SiBCN composites.

Typical fractured behaviors of SiC_f/SiBCN composites at different sintering methods.

Morphology of fractured surfaces of SiC_f/SiBCN composites prepared at different sintering methods: (a) and (d) 1800 ℃/60 MPa/30 min; (b) and (e) 1900 ℃/60 MPa/30 min; (c) and (f) 1900 ℃/60 MPa/60 min.

Room-temperature properties of SiC_f/SiBCN composites hot pressed at different sintering methods

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