Effect of Surface Treatment on Properties of Carbon Fiber and Reinforced Composites

doi:10.11901/1005.3093.2014.322

Chinese Journal of Materials Research

2015, Vol. 29

Issue (1): 67-74 DOI: 10.11901/1005.3093.2014.322

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Effect of Surface Treatment on Properties of Carbon Fiber and Reinforced Composites

Zengbo YI¹,Libang FENG^1,^2,^*(

),Xiangzhong HAO²,Xiangjun XUE²,Yuxiong GUO¹

1. School of Mechatronic Electromechanical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2. Baiyin Engineering Research Center of Special Carbon New Materials, Baiyin 730090, China

Cite this article:

Zengbo YI,Libang FENG,Xiangzhong HAO,Xiangjun XUE,Yuxiong GUO. Effect of Surface Treatment on Properties of Carbon Fiber and Reinforced Composites. Chinese Journal of Materials Research, 2015, 29(1): 67-74.

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Abstract

The carbon fibers were pre-treated by means of ultrasonic irradiation in water, immersion in nitric acid without and with ultrasonic irradiation, respectively. Then the effect of the surface pre-treatments on the microstructure, surface chemical and phase composition, the multifilament tensile strength of carbon fibers as well as the microstructure and mechanical property of the carbon fiber-reinforced epoxy resin composites were investigated. Results show that carbon fiber surfaces can be modified effectively by nitric acid oxidation with ultrasonic irradiation. Thereinto, the nitric acid treatment increases the roughness and the amount of oxygen-containing functional groups of carbon fiber surfaces, while the ultrasonic irradiation leads to a good dispersity of carbon fibers and the increase of the specific surface area and the oxygen-containing functional groups of carbon fiber surfaces. Moreover, the combined effect of the nitric acid oxidation and the ultrasonic cavitations could enhance the oxidizing and etching of the carbon fiber surfaces, which consequently may act as "mechanical anchor" and chemically active sites for enhancing the bonding between carbon fiber and resin matrix, and which further improves the mechanical property of the resulting composites significantly.

Key words: composites carbon fiber nitric acid ultrasonic surface modification

Received: 23 May 2014

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	Zengbo YI
	Libang FENG
	Xiangzhong HAO
	Xiangjun XUE
	Yuxiong GUO

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.322 OR https://www.cjmr.org/EN/Y2015/V29/I1/67

Fig.1 SEM images of CF treated after different modes: (a, e) desized; (b, f) ultrasonic treated at 60℃/2h in water; (c, g) treated at 60℃/2h in nitric acid; (d, h) ultrasonic treated at 60℃/2 h in nitric acid

Fig.2 EDS spectra of CF treated after different modes: (a) desized; (b) ultrasonic treated at 60℃/2 h in water; (c) treated at 60℃/2 h in nitric acid; (d) ultrasonic treated at 60℃/2 h in nitric acid

Table 1 Changes of the element content at CF surfaces treated after different modes

Fig.3 Tensile strength variation of CF treated after different modes: (a) desized; (b) ultrasonic treated at 60℃/2 h in water; (c) treated at 60℃/2 h in nitric acid; (d) ultrasonic treated at 60℃/2 h in nitric acid

Fig.4 XRD patterns of CF treated after different modes: (a) desized; (b) ultrasonic treated at 60℃/2 h in water; (c) treated at 60℃/2h in nitric acid; (d) ultrasonic treated at 60℃/2 h in nitric acid

Table 2 Phase structure parameters of CF treated after different modes

Fig.5 Tensile strength and flexural strength of composites reinforced with different CF: (a) desized; (b) ultrasonic treated at 60℃/2 h in water; (c) treated at 60℃/2 h in nitric acid; (d) ultrasonic treated at 60℃/2 h in nitric acid

Fig.6 Load-displacement diagram of composites reinforced with different CF: (a) desized; (b) ultrasonic treated at 60℃/2 h in water; (c) treated at 60℃/2 h in nitric acid; (d) ultrasonic treated at 60℃/2 h in nitric acid

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