Effect of B2O3 Doping and Phosphate Impregnation on Oxidation Resistance and Mechanical Properties of Mesocarbon Microbead Composites

doi:10.15541/jim20140658

Abstract

Abstract:

Mesocarbon microbead/carbon nanotubes (MCMB/CNTs) composites were modified by adding B₂O₃ powders and phosphate impregnation and the MCMB/CNTs were prepared using in-situ thermal polymerization. The morphology, flexural strength and oxidation resistance behavior were studied using scanning electron microscope (SEM), three-point bending tests, thermo gravimetric analysis (TG) and isothermal oxidation method. The results show that the oxidation resistance and flexural strength of the composites are enhanced with proper amount of B₂O₃. When the ratio of B₂O₃is beyond 2%, the flexural strength of the sample begins to decrease. The sample with 2% B₂O₃ impegnated with phosphate reachs the highest flexural strength of 66 MPa, and the initial mass loss temperature of the samples is 520℃. After isothermal oxidation at 500℃ for 60 min, the mass loss and the flexural strength of the sample are 5% and 50.3 MPa, respectively.

Key words: mesocarbon microbead, flexural strength, mass loss, oxidation resistance

CLC Number:

TQ174

LEI Zhuo-Yan, WANG Zhi, FAN Heng-Bing, MA Wen-Bin, CHEN Jian, WANG Xu. Effect of B₂O₃ Doping and Phosphate Impregnation on Oxidation Resistance and Mechanical Properties of Mesocarbon Microbead Composites[J]. Journal of Inorganic Materials, 2015, 30(7): 769-773.

Figures/Tables 7

Table 1 Formula of different processing methods

Sample	B₂O₃ content /wt%	H₃PO₄ impregnant content /mL
a	0	No
b	2	No
c	5	No
d	10	No
e	2	80

Table 2 Flexural strength of specimens treated with different processing methods

	No additive	2% B₂O₃	5% B₂O₃	10% B₂O₃	2% B₂O₃ +H₃PO₄
Flexural strength /MPa	47.0	52.0	42.0	31.6	66.0

Fig. 1 Fracture morphologies of specimens with different processing methods (a) No additive; (b) 2% B2O3; (c) 10%B2O3; (d) 2%B2O3+ H3PO4

Fig. 2 Influence of mass loss on line the flexural strength

Fig. 3 Influence of oxidation time on flexural strength

Fig. 4 Surface SEM images of the phosphate impregnated specimens affer oxidation at 500℃ for different time (a) 0 min; (b) 60 min; (c) 120 min

Fig. 5 TG curves of specimens

References 14

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Effect of B₂O₃ Doping and Phosphate Impregnation on Oxidation Resistance and Mechanical Properties of Mesocarbon Microbead Composites

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