Carbon Fiber Preform's Structure on Mechanical Property of C/C Composites and Bolts

doi:10.15541/jim20190155

Abstract

Abstract:

The C/C composites reinforced by 2D-preforms were fabricated using an electro-coupling chemical vapor infiltration (E-CVI) technique. The effects of different preform's structure on the mechanical properties of C/C and their bolts were investigated. The results show that the C/C composites reinforced by different preforms parameters exhibit different mechanical behaviors. For needle-punched preforms, as the needle-punched density decreasing from 35 pin/cm ² to 25 pin/cm ², the tensile and flexural strengths of C/C composites increased from 60.1, 119.9 MPa to 69.5, 176.8 MPa, respectively. With the carbon yarn tow changing from 12 K to 3 K, the tensile and flexural strengths of C/C composites increased from 69.5, 176.8 MPa to 105.5, 184.4 MPa, respectively. For bidirectional stitched preforms, the tensile and flexural strengths of C/C composites are 68.1 and 123.7 MPa, respectively. The different mechanical behaviors is mainly attributed to structural integrity of long fibers, and the distribution and quantity of large pores. The mechanical properties of bolts are impacted by their bulk materials and surface status, which are slightly lower than those of their counterparts.

Key words: C/C composites, preform structure, mechanical properties, bolts

CLC Number:

TG174

PANG Sheng-Yang, WANG Pei-Yao, HU Cheng-Long, ZHAO Ri-Da, TANG Su-Fang. Carbon Fiber Preform's Structure on Mechanical Property of C/C Composites and Bolts[J]. Journal of Inorganic Materials, 2019, 34(12): 1272-1278.

Figures/Tables 11

Table 1 Parameters of C/C composites reinforced by different preforms

Sample	Carbon yarn tows/K	Structure type	Needling density /(pin?cm^-2)	Density /(g?cm^-3)
A	12	Needle-punched	35	1.76
B	12	Needle-punched	25	1.78
C	6	Needle-punched	25	1.73
D	3	Needle-punched	25	1.76
E	12	Bidirectional stitched	-	1.76

Fig. 1 Microstructures of C/C composites reinforced by preforms with different needle-punched densities (a) 35 pin?cm-2; (b) 25 pin?cm-2

Fig. 2 Microstructures of C/C composites reinforced by 2D needle-punched structure with different carbon yarn tows (a) 12 K; (b) 6 K; (c) 3 K

Fig. 3 Microstructures of C/C composites reinforced by (a) needle-punched and (b) bidirectional stitched preforms

Table 2 Mechanical property of C/C composites reinforced by different preform parameters and their bolts

Sample	Carbon yarn tow/K	Structure type	Needling density /(pin?cm^-2)	Tensile strength of C/C/MPa	Flexural strength of C/C/MPa	Tensile strength of bolts/MPa
A	12	Needle-punched	35	(60.1±3)	(119.9±5)	(52.8±3)
B	12	Needle-punched	25	(69.5±4)	(176.8±7)	(64.9±3)
C	6	Needle-punched	25	(80.2±3)	(177.2±5)	(78.9±4)
D	3	Needle-punched	25	(105.5±5)	(184.4±5)	(95.3±5)
E	12	Bidirectional stitched	-	(68.1±3)	(123.7±3)	(54.5±4)

Fig. 4 Tensile stress-displacement curves of C/C composites reinforced by different preforms

Fig. 5 Tensile fracture morphologies of C/C composites reinforced by different preforms (a) 12 K needling (Sample A); (b) 6 K needling (Sample C); (c) 12 K bidirectional stitching (Sample E)

Fig. 6 Flexural stress-displacement curves of C/C composites reinforced by different preforms

Fig. 7 Typical morphology of C/C composite bolt

Fig. 8 Tensile stress-displacement curves of C/C composite bolts madc from different performs

Fig. 9 Tensile fracture morphologies of C/C composite bolts reinforced by (a) needle-punched and (b) bidirectional stitched performs

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