Microstructure and Property of TiB2 Reinforced Reaction-bonded B4C Composites

doi:10.15541/jim20140688

Abstract

Abstract:

Dense B₄C composites were fabricated by reaction bonding technique based on vacuum infiltration of silicon melt into green preforms made of microporous carbon, B₄C and Ti powders. Phase assemblage and microstructure of the composites were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrum (EDS) and transmission electron microscope (TEM). The flexural strength and fracture toughness of the composite with 15wt% Ti in its preform were 313 MPa and 5.40 MPa•m^1/2, respectively. The in-situ generated TiB₂ played a positive role in strengthening and toughening material.

Key words: reaction bonded boron carbide, microporous carbon, Ti, TiB2, toughening and strengthening

CLC Number:

TB332

LIN Qing-Qing, DONG Shao-Ming, HE Ping, ZHOU Hai-Jun, HU Jian-Bao. Microstructure and Property of TiB₂ Reinforced Reaction-bonded B₄C Composites[J]. Journal of Inorganic Materials, 2015, 30(6): 667-672.

Figures/Tables 8

Table 1 Titanium content in the preforms

Specimen	Ti0	Ti5	Ti10	Ti15	Ti30
Content of Ti in the perform/wt%	0	5	10	15	30

Fig. 1 XRD pattern of reaction bonded B4C composites without Ti addition in the preform

Fig. 2 (a, b) SEM images of composite Ti0, (c, d) EDS spectra of point 1 and 2 in image (b)

Fig. 3 XRD pattern of reaction bonded B4C composites with Ti addition in the performs

Fig. 4 SEM images of reaction bonded B4C composites (a) Ti0; (b) Ti10; (c) Ti15; (d) Ti30

Table 2 Properties of the reaction bonded B4C composites

Specimen	Density/ (g•cm^-3)	Open porosity/ %	Flexural strength/ MPa	Elastic modulus/ GPa	Vickers hardness/ MPa	Fracture toughness/ (MPa•m^1/2)
Ti0	2.52	1.6	286±12	332±11	22640±1950	4.74±0.73
Ti5	2.54	1.1	295±8	338±10	21220±1660	5.10±0.14
Ti10	2.59	0.9	320±10	323±2	21330±950	5.27±0.25
Ti15	2.63	0.6	313±12	332±4	21080±1650	5.40±0.14
Ti30	2.79	1.4	272±9	330±7	15510±700	4.97±0.23

Fig. 5 SEM images showing the propagation behavior of indentation cracks in (a) sample Ti0 and (b) sample Ti15 The arrow in image (b) indicates the occurrence of crack deflection around a TiB2 particle

Fig. 6 SEM images of the fracture surface of (a) sample Ti0 and (b) sample Ti15

References 16

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Microstructure and Property of TiB₂ Reinforced Reaction-bonded B₄C Composites

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