Strengthening mechanisms in carbon nanotube reinforced bioglass composites

doi:10.1007/s11705-012-1279-0

Front Chem Sci Eng

2012, Vol. 6

Issue (2) : 126-131 https://doi.org/10.1007/s11705-012-1279-0

RESEARCH ARTICLE

Strengthening mechanisms in carbon nanotube reinforced bioglass composites

Jing ZHANG¹(

), Chengchang JIA², Zhizhong JIA², Jillian LADEGARD³, Yanhong GU³, Junhui NIE²

1. Department of Mechanical Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA; 2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; 3. Department of Mechanical Engineering, University of Alaska Fairbanks, Fairbanks, AK 99775, USA

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Abstract

Carbon nanotube reinforced bioglass composites have been successfully synthesized by two comparative sintering techniques, i.e., spark plasma sintering (SPS) and conventional compaction and sinteirng. The composites show improved mechanical properties, with SPS technique substantially better than conventional compact and sintering approach. Using SPS, compared with the 45S5Bioglass matrix, the maximum flexural strength and fracture toughness increased by 159% and 105%, respectively. Enhanced strength and toughness are attributed to the interfacial bonding and bridging effects between the carbon nanotubes and bioglass powders during crack propagations.

Keywords 45S5Bioglass multi-wall carbon nanotubes biocomposite mechanical properties sintering

Corresponding Author(s): ZHANG Jing,Email:jz29@iupui.edu

Issue Date: 05 June 2012

Cite this article:

Jing ZHANG,Chengchang JIA,Zhizhong JIA, et al. Strengthening mechanisms in carbon nanotube reinforced bioglass composites[J]. Front Chem Sci Eng, 2012, 6(2): 126-131.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-012-1279-0
https://academic.hep.com.cn/fcse/EN/Y2012/V6/I2/126

Fig.1 Images of starting materials. (a) SEM image of 45S5Bioglass powder; (b) TEM image of MWCNTs: the one on the lower left side is a single MWCN, and the one on the top and right sides is MWCN bundles

Tab.1 The mechanical properties of the sintered MWCNTs/45S5Bioglass composites obtained by SPS and conventional sintering (CS)

Fig.2 (a) Flexural strength, (b) fracture toughness, and (c) hardness of the MWCNTs/45S5Bioglass composites as a function of MWCNTs content

Fig.3 The SEM images of fracture surfaces of the composites using SPS. (a) 5 wt-% MWCNTs/45S5Bioglass composite. (b) 9 wt-% MWCNTs/45S5Bioglass composite.

Fig.4 The indentation crack propagation of 5 wt-% MWNTs/45S5Bioglass composite. The bridging nanotubes are evident along the crack

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