Research Progress on Micro-mechanical Property of Continuous Fiber-reinforced Ceramic Matrix Composites

doi:10.15541/jim20170421

Abstract

Abstract:

Localized mechanical properties of composite components (fiber, matrix, and interface) are critical parameters bridging the composition, microstructure and macro-mechanical performance of continuous fiber-reinforced ceramic matrix composites (CFRCMCs). However, they are difficult to be acquired and decoupled from bulk composites based on the traditional macro-mechanical testing techniques, due to their limited testing volumes and complex heterogeneous composite structures. The above questions has been solved recently by novel nano/micro mechanical testing and focused ion beam milling (FIB) techniques, which provide powerful tools to quantify the micro-mechanical properties of CFRCMCs. In this paper, recent progress in micro-mechanical properties of CFRCMCs was firstly reviewed, with special emphasis on the in-situ modulus and toughness of ceramic fibers and matrix, and the shear property of fiber/matrix interface. Following that, a criterion based on the He-Hutchinson cracking model was proposed to predict the macro mechanical performance of CFRCMCs by using those micro-mechanical parameters.

Key words: ceramic matrix composites, micro-mechanics, nanoindentation, focused ion beam, review

CLC Number:

TB323

LIU Hai-Tao, YANG Ling-Wei, HAN Shuang. Research Progress on Micro-mechanical Property of Continuous Fiber-reinforced Ceramic Matrix Composites[J]. Journal of Inorganic Materials, 2018, 33(7): 711-720.

Figures/Tables 13

Fig. 1 (a) Young's modulus of the AS fiber in ASf/SiO2 composites prepared at different temperatures as a function of penetration depth; SPM images of the nanoindentation imprints of ASf/SiO2 composites fabricated at 600℃ (b) and 1200℃ (c)[10]

Fig. 2 Young°s modulus of the SiO2 matrix in ASf/SiO2 composites prepared at different temperatures as a function of penetration depth[10]

Fig. 3 Radial cracks originating at the edges of a Berkovick indentation for carbide coating[32]

Fig. 4 (a) Schematic representation of the micro-cantilever bending geometry; SEM images of a micro-cantilever prepared from SiC matrix in SiCf/SiC composites before (a) and after (b) testing[11,18]

Fig. 5 SEM image of an example of a pillar after splitting[17]

Fig. 6 Morphologies of the micropillars on individual SiC matrix and SiC fiber (a, b); Micropillar morphologies of SiC fiber and SiC matrix after pillar splitting tests(c, d); Representive force-displacement curves of SiC matrix and SiC fiber by the micropillar splitting tests (e); Evolution of localized fracture toughness of the SiC matrix and SiC fiber as a function of composite fabrication temperature(f)[28]

Fig. 7 Typical features of the load-deformation curve of mini- composites[39]

Fig. 8 (a) Schematic drawing of fiber push-out measurement; (b) Typical load-displacement push-out test curve; SEM images of the frontside surface (c) and backside surface (d) of SiCf/SiC minicomposite after fiber push-out test using a flat punch indenter[43]

Fig. 9 (a) Schematic drawing of fiber push-in measurement, (b) Typical load-displacement push-in test curve[45]

Table 1 Interfacial bonding strength of typical CFRCMCs investigated in our research group

Composites	Interphase	τ/MPa	Flexural strength/MPa	Fracture mode	Ref.
PIP 3D C_f/SiC	None	105	23	Brittle	[19]
PIP 3D C_f/SiC	PyC	30	378	Toughened	[19]
PIP 3D Nextel440 AS_f/SiC	None	293	45	Brittle	[34]
PIP 3D Nextel440 AS_f/SiC	PyC	42	163	Toughened	[34]
Sol-Gel 3D SiC_f/Mullite	None	537	230	Brittle	[46]
Sol-Gel 3D SiC_f/Mullite	PyC	155	35	Toughened	[46]
PIP 3D SiC_f/SiC	None	450	90	Brittle	[28]
PIP 3D SiC_f/SiC	BN	50	200	Toughened	[28]
Sol-Gel 3D ALF AS_f/SiO₂(600℃)	None	50	105	Toughened	[10]
Sol-Gel 3D ALF AS_f/SiO₂(1200℃)	None	260	45	Brittle	[10]

Fig. 10 SEM images of the pushed fiber in ASf/SiC (a) and ASf/C/SiC (b) composites[34]

Table 2 Micro-mechanical parameters of SiCf/SiC and SiCf/BN/SiC composites investigated in Liu’s group[28]

Composites	E_m/GPa	E_f/GPa	Γ_m/(J·m^-2)	Γ_f/(J·m^-2)	E_{BN interphase}/GPa	Γ_{BN interphase}/(J·m^-2)
SiC_f/SiC (800℃)	118	160	49	29	-	-
SiC_f/SiC (900℃)	170	160	15	29	-	-
SiC_f/SiC (1000℃)	256	160	5	29	-	-
SiC_f/BN/SiC	-	160	-	29	70	4

Fig. 11 Predictions on macro-mechanical behavior of SiCf/SiC and SiCf/BN/SiC composites based on H-H model[28]

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