Influence of uni and bi-modal SiC composition on mechanical properties and microstructure of reaction-bonded SiC ceramics

Jang, Byung Koog; Kim, Seyoung; Han, In Sub; Seo, Doo Won; Hong, Kee Seog; Woo, Sang Kuk; Sakka, Yoshio

doi:10.2109/jcersj2.118.1028

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…In other word, the fracture toughness does not vary with the applied load, which indicates the validity of the results for the fracture toughness as it is exclusive for a given material at a particular temperature. The averages of fracture toughness under different applied loads are treated as the final fracture toughness at a particular temperature, plotted with its error bar in For intergranular fracture, larger fracture energy than transgranular fracture is consumed [28].…”

Section: Fracture Toughnessmentioning

confidence: 99%

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Characterization of hardness, elastic modulus and fracture toughness of RB-SiC ceramics at elevated temperature by Vickers test

Rao

Zhang

Luo

et al. 2019

Materials Science and Engineering: A

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In this paper, mechanical properties of RB-SiC ceramics, such as hardness, elastic modulus and fracture toughness, are characterized through indentation technique using a Vickers indenter at elevated temperatures ranging from room temperature to 1200 °C realized by laser heating.. The indentation size effect, load-displacement curves and relationship between crack length and applied load are studied in order to determine hardness, elastic modulus and fracture toughness accurately. The results show that the Meyer's index and Vickers hardness decrease with the increase temperature. It indicates that the permanent plastic deformation of RB-SiC ceramics is mainly responsible for the indentation size effect and the reduction of hardness at elevated temperature. Both material softening and plastic deformation will contribute to the indentation creep at elevated temperature as shown in the load-displacement curves. The elastic modulus decreases with the increase of temperature due to increase of contact depth as a result of less elastic recovery. In the indentation test for calculating fracture toughness, only radial-median cracks are identified by the relationship between crack length and applied load at all temperatures, although the fracture mode observed at the indent corner changes from transgranular at room temperature to intergranular at elevated temperature. As more energy is consumed by intergranular facture and cracking-healing takes place due to oxidation, only short crack length appears in the indentation test which implies an increase of fracture toughness with the increase of temperature. However, this tendency has an exception at the highest temperature of 1200℃. This is because the free Si softening in RB-SiC specimen fails to resist crack propagation at extremely high temperature. Consequently, the crack length increases again which leads to the increase of the calculating fracture toughness at the highest temperature. These variations of hardness, elastic modulus and fracture toughness with temperatures will account for the possible change of material removal regimes occurred in some thermal-involved hybrid machining of RB-SiC ceramics.

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Section: Fracture Toughnessmentioning

confidence: 99%

“…However, research on mechanical properties of RB-SiC ceramics, up to date, mainly focus on the influence of microstructure [27,28], annealing treatment [29,30] and carbon perform [31] during the material fabrication. These investigations were generally conducted at room temperature with a conventional measuring technique.…”

Section: Introductionmentioning

confidence: 99%

Characterization of hardness, elastic modulus and fracture toughness of RB-SiC ceramics at elevated temperature by Vickers test

Rao

Zhang

Luo

et al. 2019

Materials Science and Engineering: A

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“…Nevertheless, as compared with transgranular fracture, intergranular crack propagation can consume a larger fracture energy through lengthening crack propagation path achieved by the crack deflection and crack branching (Figure 8A‐C). 33 For LaB 6 ‐90 wt.%SiC composite, besides the toughness mechanism mentioned above, the closed pore is also revealed, as shown in Figure 8D, which can decrease the toughness of the composite.…”

Section: Resultsmentioning

confidence: 82%

The densification behavior, microstructure, mechanical, and thermionic emission properties of LaB6‐SiC composite

Yang,

Zhao,

Wang

et al. 2023

Int J Applied Ceramic Tech

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The LaB6‐SiC composite with the different SiC content (0, 15, 30, 36, 50, 90, and 100 wt.%,) was densified by spark plasma sintering. The effects of SiC content on the densification behavior, microstructure, mechanical, and thermionic emission properties of LaB6‐SiC composite were systemically investigated. The results show that all the rapid shrinkage occurred at the heating stage during densification, and LaB6‐36 wt.%SiC composite owned the maximum shrinkage rate of 1.5 mm/min at T = 1798oC. The highest relative density of the composite decreased from 98.18% to 95.01% as the SiC content increased from 15 wt.% to 90 wt.%, under which the morphology of LaB6 grain evaluated from the equiaxed to elongated structure, and LaB6 grain size varied in the range of 5.05–11.42 μm. The similar eutectic structures were observed in the LaB6‐36 wt.% SiC composite because of some LaB6 grains melting. Both the highest fracture toughness of 5.15 ± 0.56 MPa.m1/2 and the highest bending strength of 313 ± 4.7 MPa belonged to the LaB6‐36 wt.% SiC composite, which also exhibited thermionic emission current density of 10.74 A/cm2 and work function of 2.99 eV at T = 1873 K.

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“…Byung koog Jang et al [ 19 ] reported the uni-modal distribution and bi-modal distribution characteristics of SiC raw material powder. The mechanical properties of RBSC made of bi-modal distribution SiC are obviously better than those of uni-modal distribution SiC.…”

Section: Introductionmentioning

confidence: 99%

Influence of Carbon Source on Microstructural and Mechanical Properties of High-Performance Reaction-Bonded Silicon Carbide

et al. 2022

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Reaction-bonded silicon carbide (RBSC) has become an important structural ceramic with the benefit of being capable of preparing complex-shaped products. In order to fabricate high-performance RBSC, particle gradation of raw SiC combined with slip casting was used to prepare the porous preform before liquid silicon infiltration (LSI). The microstructural and mechanical properties of RBSC were compared by adding different amounts of carbon black (CB) content from 4 wt% to 10 wt%. Two pore structures with submicron and nano pores formed in the preform. As the amounts of carbon black increased, the mechanical properties improved and then suddenly weakened due to residual silicon initiating a nonuniform microstructure. The elastic modulus of the preform with 8 wt%CB after LSI was 389 ± 4 GPa and the flexural strength was 340 ± 17 MPa, which improved by about 150% compared to other rapid prototyping methods and has attractive application prospects.

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Influence of uni and bi-modal SiC composition on mechanical properties and microstructure of reaction-bonded SiC ceramics

Cited by 11 publications

References 22 publications

Characterization of hardness, elastic modulus and fracture toughness of RB-SiC ceramics at elevated temperature by Vickers test

Characterization of hardness, elastic modulus and fracture toughness of RB-SiC ceramics at elevated temperature by Vickers test

The densification behavior, microstructure, mechanical, and thermionic emission properties of LaB6‐SiC composite

Influence of Carbon Source on Microstructural and Mechanical Properties of High-Performance Reaction-Bonded Silicon Carbide

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