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Chinese Journal of Materials Research  2017, Vol. 31 Issue (2): 88-95    DOI: 10.11901/1005.3093.2016.234
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Preparation and Tensile-compressive Properties of Syntactic Foams of Epoxy Resin Filled with Fly Ash Cenospheres
Miaomiao LI,Ping CHEN(),Hui WANG,Jianchao LI
School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
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Miaomiao LI,Ping CHEN,Hui WANG,Jianchao LI. Preparation and Tensile-compressive Properties of Syntactic Foams of Epoxy Resin Filled with Fly Ash Cenospheres. Chinese Journal of Materials Research, 2017, 31(2): 88-95.

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Abstract  

The tensile-compressive properties of syntactic foams of fly ash cenospheres/epoxy resin were measured by universal testing machine, and the fracture surface were characterized by scanning electron microscopy (SEM). The effect of the content, particle size and gradation ratio of fly ash cenospheres on the tensile-compressive properties of the syntactic foam was investigated. The results show that the tensile strength and compressive strength of the syntactic foam increases first and then decreases with the increase of cenospheres content. The compressive strength of the syntactic foams reaches a maximum when the content of cenospheres is 15phr, while the tensile strength and compressive strength increase by 9.15% and 6.86% compared with pure epoxy resin respectively. For the same filling amount, the smaller the particle size of the cenospheres, the higher the tensile strength and compressive strength of the syntactic foam. The tensile strength and compressive strength of the syntactic foam filled with small size cenospheres (20 μm) increase 158.41% and 19.96% respectively over that of the syntactic foam filled with large size cenospheres (250 μm). The tensile strength and compressive strength of the syntactic foam filled with cenospheres of different grading ratios is mainly affected by the content of small size cenospheres. The more the content of small size cenospheres, the higher the tensile strength and compressive strength of the syntactic foam.
Key words:  composites      epoxy syntactic foam      tensile properties      compressive properties      fly ash cenospheres     
Received:  29 April 2016     
Fund: Supported by National Natural Science Foundation of China (No.51305023)
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Miaomiao LI
Ping CHEN
Hui WANG
Jianchao LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.234     OR     https://www.cjmr.org/EN/Y2017/V31/I2/88

Fig.1  Schematic diagram of cenospheres modification
Fig.2  SEM micrographs of modified cenospheres distribution in the epoxy
Sample number Cenospheres type Cenospheres content/phr Density/gcm-3
1 20 μm 0 1.206
2 20 μm 5 1.196
3 20 μm 10 1.155
4 20 μm 15 1.139
5 20 μμm 20 1.084
6 20 μm 25 1.076
7 250 μm 15 1.014
8 150 μm 15 1.039
9 54 μm 15 1.096
10 20 μm :54 μm =2:8 15 1.034
11 20 μm :54 μm =4:6 15 1.060
12 20 μm :54 μm =5:5 15 1.080
13 20 μm :54 μm =6:4 15 1.083
14 20 μm :54 μm =8:2 15 1.144
Table 1  Sample parameters
Fig.3  Influence of cenospheres content on stress-strain relationship for the cenospheres/epoxy resin syntactic foam (a) tensile stress-strain curve (b) compressive stress-strain curve
Fig.4  SEM micrographs of tensile fracture surface of epoxy resin filled with different cenospheres content (a) 0phr,(b) 5phr,(c) 10phr,(d) 15phr,(e) 20phr,(f) 25phr
Fig.5  SEM micrographs of agglomeration of cenospheres
Cenospheres content
/phr		 Tensile strength
/MPa		 Tensile modulus/MPa Compressive strength
/MPa		 Compressive modulus /MPa
0 34.33 486.12 45.17 435.45
5 34.87 503.27 45.90 623.64
10 35.93 503.19 46.32 443.38
15 37.47 583.53 48.27 556.04
20 32.24 506.94 44.32 579.62
25 22.45 488.42 37.44 469.87
Table 2  Tensile and compressive properties of epoxy resin filled with different cenospheres content
Fig.6  Influence of cenospheres size on stress-strain relationship for the cenospheres/epoxy resin syntactic foam (a) tensile stress-strain curve (b) compressive stress-strain curve
Fig.7  SEM micrographs of tensile fracture surface of epoxy resin filled with different cenospheres size (a) 250 μm,(b) 150 μm,(c) 54 μm
Cenospheres size
/μm		 Tensile strength
/MPa		 Tensile modulus/MPa Compressive strength
/MPa		 Compressive modulus /MPa
250 14.50 439.51 40.24 320.31
150 23.80 474.26 41.02 431.45
54 31.39 493.42 43.41 308.29
20 37.47 583.53 48.27 556.04
Table 3  Tensile and compressive properties of epoxy resin filled with different cenospheres size
Fig.8  Influence of cenospheres grading ratio on stress-strain relationship for the cenospheres/epoxy resin syntactic foam (a) tensile stress-strain curve (b) compressive stress-strain curve
Fig.9  SEM micrographs of tensile fracture surface of composites filled with different grading ratio (a) 2:8, (b) 4:6, (c) 5:5, (d) 6:4, (e) 8:2
Grading ratio
/20 μm:54 μm		 Tensile strength
/MPa		 Tensile
modulus /MPa		 Compressive strength
/MPa		 Compressive modulus /MPa
2:8 31.70 507.54 43.83 510.68
4:6 34.03 486.09 44.68 540.74
5:5 34.38 569.01 44.92 442.29
6:4 34.92 537.27 45.47 356.44
8:2 35.59 527.69 46.31 257.02
Table 4  Tensile and compressive properties of epoxy resin filled with different cenospheres grading ratio
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