Mechanical properties and fracture behavior of B 4 C-nano/micro SiC composites produced by pressureless sintering

Moradkhani, Alireza; Baharvandi, Hamid Reza

doi:10.1016/j.ijrmhm.2017.10.001

Cited by 33 publications

(14 citation statements)

References 36 publications

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“…7a, in case that there are no reinforcements or additives in the structure, the crack growth path is mainly transgranular and almost in a straight line, and therefore the final fracture is mainly transgranular. However, by the addition of nano β-SiC and graphene particles, crack through deviation towards the grain boundary in its growth path overshadows more of them, and as a result, the percentage of intergranular grain boundary fracture increases 69 . In the 5B1G sample (Fig.…”

Section: Toughnessmentioning

confidence: 99%

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αSiC - βSiC - graphene composites

Razmjoo

Baharvandi

Ehsani

2023

Sci Rep

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In this study, the mechanical properties of the pressureless sintered samples of α-SiC based composite containing 0–3 wt.% graphene and 0–15 wt.% nano β-SiC were investigated. Simultaneous usage of nano β-SiC and graphene and transformation of β-SiC (3C) to α-SiC (6H/4H) resulted in elongation of secondary α-SiC grains, which significantly improved the mechanical properties (e.g. fracture toughness) of SiC ceramics. According to the results, the highest Relative density of 99.04%, Young’s modulus of 537.76 GPa and fracture toughness of 5.73 MPa × m1/2 were obtained in the sample containing 5 wt.% nano β-SiC and 1 wt.% graphene (5B1G). In addition, two methods of measuring bending strength including three-point bending tests and biaxial tests (piston-on-three-ball) were compared. Strip-shaped specimens were prepared for three-point bending test and disc-shaped specimens were prepared for biaxial bending test. Each bending test was evaluated using a universal testing machine. The results showed that the biaxial bending strength is less than the three-point bending strength. Also, the maximum three-point bending strength of 582.01 MPa and biaxial bending of 441.56 MPa were obtained in 5 wt.% Nano β-SiC and 1 wt.% Graphene samples (5B1G). Studies have shown that in addition to the many advantages of using the biaxial bending method, the results have a very similar trend to the three-point bending strength. Also, the most-increased hardnesses of 28.03 GPa and 29.97 GPa were seen in the sample containing 5 wt.% nano β-SiC (5B) with forces of 10 N and 1 N, respectively. One of the effective mechanisms in improving the fracture toughness of α-SiC ceramics is crack deflection/bridging. Also, the difference in thermal expansion of the α-SiC matrix and the reinforcements, leading to the creation of residual stresses between the matrix grains and the reinforcement, is effective in improving the mechanical properties (e.g. strength and fracture toughness).

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Section: Toughnessmentioning

confidence: 99%

“…7c, the presence of stepped surfaces within the grains, which represent the cleavage steps, is quite evident, highlighted with ovals in the image. Stepped cleavage surfaces, like dislocations, can deviate the crack path 69 . It can also be seen in Fig.…”

Section: Toughnessmentioning

confidence: 99%

αSiC - βSiC - graphene composites

Razmjoo

Baharvandi

Ehsani

2023

Sci Rep

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“…Therefore, the utilization of raw materials with fine particle size is more conducive to promoting the sintering of B 4 C-SiC ceramics. For the grain size of B 4 C-SiC ceramics, Moradkhani and Baharvandi 80 found that the effect of the addition of SiC with nanoscale and microscale sizes on the grain size of the pressureless sintered B 4 C-SiC ceramics is not very significant.…”

Section: Raw Materialsmentioning

confidence: 99%

“…However, higher sintering temperatures are needed for B 4 C-rich ceramics to achieve better sintering performance, and the relative density of B 4 C-rich ceramics is 95% only after sintering at 2200 1C. This phenomenon may be caused by the greater proportion of covalent bonds in B 4 C. Moradkhani and Baharvandi 80 found that the grain size of B 4 C-10 wt% SiC ceramics slightly increases with the increase in sintering temperature from 2100 to 2200 1C. In addition, the excessive sintering temperature is also not beneficial for improving the densification of B 4 C-SiC ceramics under the mechanism of liquid-phase sintering.…”

Section: Materials Advances Reviewmentioning

confidence: 99%

Recent progress in B₄C–SiC composite ceramics: processing, microstructure, and mechanical properties

Zhang

2023

Mater. Adv.

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“…Moradkhami et al [19] have reported the fracture toughness of B4C-SiC composite in the range of 5 MPam -½ to 6 MPam -½ . Moshtaghioun et al [13] have reported the fracture toughness of B4C-15% SiC as 5.7 MPam -½ .…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Development and characterization of SiC fiber reinforced B4C composite

Sonber

Majumdar²,

Kain³

2021

J Met Mater Miner

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This study is conducted to investigate the effects of silicon carbide short fiber (SiCf) reinforcement on processing and properties of boron carbide ceramic. Studies have been carried out on the hot pressing, mechanical property measurement, microstructure evolution and oxidation study of SiCf reinforced B4C composite. B4C-SiCf composites have been prepared by hot pressing at 1950℃ with varying SiCf content in the range of 10 vol% to 30 vol%. All the composites are densified to near theoretical density. It is noticed that hardness of composite is decreased and fracture toughness of composite is increased by addition of SiC fiber. Hardness of the composites are found in the range of 32 GPa to 38 GPa. Fracture toughness of the composites are obtained to be higher than that of the monolithic boron carbide. The values are measured in the range of 4.3 MPa⋅m-½ to 5.1 MPa⋅m-½. In microstructure evolution it is found that SiC fibers are uniformly distributed throughout the matrix. The developed B4C-SiCf composites have been found to have good resistance to oxidation at 800℃ in air.

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Mechanical properties and fracture behavior of B 4 C-nano/micro SiC composites produced by pressureless sintering

Cited by 33 publications

References 36 publications

αSiC - βSiC - graphene composites

αSiC - βSiC - graphene composites

Recent progress in B₄C–SiC composite ceramics: processing, microstructure, and mechanical properties

Development and characterization of SiC fiber reinforced B4C composite

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Mechanical properties and fracture behavior of B 4 C-nano/micro SiC composites produced by pressureless sintering

Cited by 33 publications

References 36 publications

αSiC - βSiC - graphene composites

αSiC - βSiC - graphene composites

Recent progress in B4C–SiC composite ceramics: processing, microstructure, and mechanical properties

Development and characterization of SiC fiber reinforced B4C composite

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Product

Resources

About

Recent progress in B₄C–SiC composite ceramics: processing, microstructure, and mechanical properties