Research on Microstructures and Properties of in-situ Synthesis of TiB2-TiC0.8-SiC Multiphase Ceramics

doi:10.3724/SP.J.1077.2013.12282

Abstract

Abstract:

TiB₂-TiC_0.8-SiC multiphase ceramics were prepared by in-situ hot-pressing sintering. The phase composition and microstructures of the materials were characterized by optical microscope, X-ray diffraction technology and scanning electron microscope. The effects of sintering temperature on the phases, microstructures and mechanical properties of the ceramics were investigated. The results show that with the increase of sintering temperature, density, bending strength and fracture toughness of the ceramics are increasing significantly in the temperature from 1700℃ to 1950℃. Fully densified in-situ TiB₂-TiC_0.8-SiC multiphase ceramics with well-developed and optimized microstructure are obtained after sintered at 1900℃, in which the uniform distribution of lath-shape TiB₂ and bulk TiC_0.8 grains is obvious. The present study shows that Vickers hardness, fracture toughness and flexural strength of the TiB₂-TiC_0.8-SiC multiphase ceramics sintered at 1900℃ are 23.6 GPa, (7.0±1.0) MPa·m^1/2 and 470.9 MPa, respectively. When sintering temperature was up to 1950℃, TiB₂ and TiC_0.8 grains grew up, and therefore the bending strength of multiphase ceramics was reduced. TiB₂,TiC_0.8and SiC particles were incorporated to improve the particulate strength and toughness of composite material by the synergistic action of the mechanisms such as crack deflection, grain's pull-out and fine-grain toughening.

Key words: in-situ synthesis, hot-pressing, multiphase ceramics, TiB₂-TiC_0.8-SiC

CLC Number:

TB332

SUN Pei-Qiu, ZHU De-Gui, JIANG Xiao-Song, SUN Hong-Liang, XIA Zhao-Hui. Research on Microstructures and Properties of in-situ Synthesis of TiB₂-TiC_0.8-SiC Multiphase Ceramics[J]. Journal of Inorganic Materials, 2013, 28(4): 363-368.

Figures/Tables 7

Fig. 1 XRD patterns of TiB2-TiC0.8-SiC multiphase ceramics sintered at different temperatures

Fig. 2 Optical micrographs of TiB2-TiC0.8-SiC multiphase ceramics sintered at different temperatures

Fig. 3 Backscattered SEM micrographs and energy dispersive spectroscopy (EDS) spectra of TiB2-TiC0.8-SiC multiphase ceramics sintered at different temperatures

Temper- ature/℃	Relative density /%*	Vickers hardness/GPa	Fracture toughness K_IC/(MPa·m^1/2)
1700	85.5	11.2	5.5±1.0
1800	92.0	18.1	5.6±1.0
1850	97.2	22.4	6.9±1.0
1900	100.6	23.6	7.0±1.0
1950	101.5	24.1	9.1±1.0

Fig. 4 Relationship between relative density, TiB2 grain sizes, bending strength and sintering temperature in the TiB2-TiC0.8-SiC multiphase ceramics

Fig. 5 SEM images of fracture surface of TiB2-TiC0.8-SiC multiphase ceramics sintered at different temperatures

Fig. 6 Crack propagation paths of TiB2-TiC0.8-SiC multiphase ceramics sintered at 1900℃

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Research on Microstructures and Properties of in-situ Synthesis of TiB₂-TiC_0.8-SiC Multiphase Ceramics

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