Preparation and Flexural Property of In-situ Vapor Grown Carbon Fibers Reinforced C/C Composites

doi:10.15541/jim20180058

Abstract

Abstract:

The in-situ vapor grown carbon fibers (VGCFs) were synthesized by chemical vapor deposition (CVD) on carbon felt and C/C composites of different densities, using propylene as carbon resources and FeCl₃·6H₂O as catalyst. And VGCFs-C/C composites were prepared on carbon felt and C/C composites of different densities with in-situ VGCFs. The effects of pressure in the reactor and density of the substrate on growth of VGCFs were investigated, and the morphology of in-situ VGCFs and the change of morphology of pyrolytic carbon on the substrate with in-situ VGCFs were observed by scanning electron microscope (SEM) and optical microscope. In addition, the flexural properties of C/C composites and VGCFs-C/C composites were investigated. Results show that low density of substrate is beneficial to the in-situ growth of VGCFs when the pressure in the reactor is 3700 Pa. In-situ VGCFs change the morphology of pyrolytic carbon, and induce the formation of the spherical structure, which can enhance the interface bonding force like nails doing. Therefore, the flexural strength of sample with high content of VGCFs is improved.

Key words: vapor grown carbon fibers, C/C composites, in-situ growth, flexural property

CLC Number:

TB332

YAN Ming-Yang, YANG Min, LI Hong, REN Mu-Su, YU Ming-Ming, SUN Jin-Liang. Preparation and Flexural Property of In-situ Vapor Grown Carbon Fibers Reinforced C/C Composites[J]. Journal of Inorganic Materials, 2018, 33(11): 1161-1166.

Figures/Tables 14

Fig. 1 The temporal profile of the temperature of CVD experiment

Fig. 2 Morphologies of VGCFs grown in-situ on carbon felt at different pressures

Table 1 Mass of VGCFs grown in-situ on carbon felt at different pressures

Pressure/Pa	m₁/g	m₂/g	Δm₁/g
3500	8.7349	8.7873	0.0524
3700	9.5651	10.5503	0.9852
3900	9.1462	9.5761	0.4299

Fig. 3 Morphologies of VGCFs grown in-situ on C/C composite of different densities

Table 2 Mass of VGCFs grown in-situ on C/C composites of different densities

Density/(g·cm^-3)	m₃/g	m₄/g	Δm₂/g
0.3	551.8821	558.5047	6.6226
0.8	392.5014	395.2516	2.7475
1.3	238.7232	238.7948	0.0716
1.7	209.0905	209.0989	0.0084

Fig. 4 SEM images of C/C composites of different densities loaded with catalyst

Fig. 5 Flexural stress-strain curves of C/C composites (A1) and VGCFs-C/C composites prepared on carbon felt at different pressures (A2-A4)

Table 3 Flexural properties of C/C composites (A1) and VGCFs-C/C composites prepared on carbon felt at different pressures (A2-A4)

Sample	Density/ (g·cm^-3)	E_f/GPa	σ_f/MPa	CV_Ef/%	CVσ_f/%
A1	1.82	17.14	74.11	4.4	13.2
A2	1.79	27.19	96.93	11.1	10.9
A3	1.80	38.47	142.61	1.9	5.2
A4	1.79	31.37	113.79	4.4	5.6

Fig. 6 Fracture SEM images of C/C composites and VGCFs- C/C composites prepared on carbon felt at different pressures

Fig. 7 Morphologies of pyrolytic carbon on carbon fibers (a) and pyrolytic carbon on carbon fibers with VGCFs (b)

Fig. 8 High magnification fracture SEM morphology of sample A3 (3700 Pa)

Fig. 9 Flexural stress-strain curves of VGCFs-C/C composites prepared on C/C composites of different densities

Table 4 Flexural properties of C/C composites (A1) and VGCFs-C/C composites prepared on C/C composites of different densities (B1-B4)

Sample	Density/(g·cm^-3)	E_f/GPa	σ_f/MPa	CV_E_f/%	CVσ_f/%
A1	1.82	17.14	74.11	4.4	13.2
B1	1.81	18.65	105.56	1.9	5.5
B2	1.80	17.92	91.28	6.6	7.2
B3	1.79	11.71	85.03	4.9	12.7
B4	1.82	13.11	84.35	6.5	10.1

Fig. 10 Fracture SEM images of VGCFs-C/C composites based on C/C composites of different densities

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