Study of Fracture Behavior of Very Fine‐Grained Silicon Carbide Ceramics

Kodama, Hironori; Miyoshi, T.

doi:10.1111/j.1151-2916.1990.tb06720.x

Cited by 48 publications

(12 citation statements)

References 14 publications

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“…Hardness increased from 19.7 ± 0.6 GPa for ZCSC10 to 23.0 ± 0.5 GPa for ZCSC30. The hardness values were similar to values predicted using ROM with reported values for ZrC (~20 GPa) and SiC (~28 GPa). A previous report gave Young's modulus (390 GPa) and Vickers hardness (18.8 GPa) of ZrC‐30 vol% SiC that were lower than those obtained in the present work.…”

Section: Resultssupporting

confidence: 90%

Densification, microstructure, and mechanical properties of ZrC–SiC ceramics

Fahrenholtz

Watts

et al. 2019

J Am Ceram Soc

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ZrC–SiC ceramics were fabricated by high‐energy ball milling and reactive hot pressing of ZrH2, carbon black, and varying amounts of SiC. The ceramics were composed of nominally pure ZrC containing 0 to 30 vol% SiC particles. The relative density increased as SiC content increased, from 96.8% for nominally pure ZrC to 99.3% for ZrC‐30 vol% SiC. As SiC content increased from 0 to 30 vol%, Young's modulus increased from 404 ± 11 to 420 ± 9 GPa and Vickers hardness increased from 18.5 ± 0.7 to 23.0 ± 0.5 GPa due to a combination of the higher relative density of ceramics with higher SiC content and the higher Young's modulus and hardness of SiC compared to ZrC. Flexure strength was 308 ± 11 MPa for pure ZrC, but increased to 576 ± 49 MPa for a SiC content of 30 vol%. Fracture toughness was 2.3 ± 0.2 MPa·m1/2 for pure ZrC and increased to about 3.0 ± 0.1 MPa·m1/2 for compositions containing SiC additions. The combination of high‐energy ball milling and reactive hot pressing was able to produce ZrC–SiC ceramics with sub‐micron grain sizes and high relative densities with higher strengths than previously reported for similar materials.

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Section: Resultssupporting

confidence: 90%

Densification, microstructure, and mechanical properties of ZrC–SiC ceramics

Fahrenholtz

Watts

et al. 2019

J Am Ceram Soc

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“…The fracture toughness of SiC has been widely investigated by various test techniques: micro-and nano-indentation [32,71,76,78,87,[90][91][92]94,110,112,113,117,118], surface crack in flexure (SCF) [29,71,72,77,82,105,109,112,[119][120][121][122][123], double cantilever beam (DCB) [117], double torsion (DT) [75,106,117,124], single edge notched beam (SENB) [54,58,88,117,120,121,[125][126][127][128][129][130][131][132], Chevron notched beam (CNB) [121], and fractography [120]. The representative values determined by each test are sum...…”

Section: Fracture Toughnessmentioning

confidence: 99%

“…The hardness of SiC was investigated by Vicker's [29,32,71,72,76,78,80,82,84,91,94,106,[109][110][111][112][113], Knoop [32,75,76,81] and nano-indentation techniques, [90][91][92][93] and summarized in Table 5. There appears to be no significant difference between Vicker's and Knoop hardness, while nano-hardness gives slightly higher values.…”

Section: Hardnessmentioning

confidence: 99%

Handbook of SiC properties for fuel performance modeling

Snead

Nozawa

Katoh

et al. 2007

Journal of Nuclear Materials

1,168

582

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“…The high surface area of the 5 wt % in situsynthesized nano-sized SiC increased the driving force of the powder compacts for densification. An enhancement in the densification of SiC ceramics has been observed when nano-sized SiC, 26)28) polycarbosilane-derived nano-sized SiC, 29) or mechanically alloyed nano-sized SiC powders 10) were used as the starting material. Therefore, the addition of in situ-synthesized nanosized SiC is beneficial for the densification of submicron-sized SiC with a small amount (1 wt %) of additives.…”

Section: )20)mentioning

confidence: 99%

Influence of powder characteristics on the electrical resistivity of SiC ceramics

Lim

Kim

2012

J. Ceram. Soc. Japan

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Four types of commercially available SiC powders were hot-pressed with 1 wt % Dy 2 O 3 AlN additives in a 3:2 molar ratio. Three submicron-sized SiC powders could be densified so as to have a relative density higher than 98%, whereas a micron-sized SiC powder showed limited densification up to 93.5%. SiC ceramics fabricated from ¢-SiC powders exhibited electrical resistivities (³10 ¹1 ³·cm) that were lower than those from ¡-SiC powders (³10 1 ³·cm). The lower electrical resistivity of the SiC ceramics fabricated from ¢-SiC powders could be attributed to a higher carrier density and enhanced charge mobility when compared to the SiC ceramics from ¡-SiC powders.©2012 The Ceramic Society of Japan. All rights reserved.Key-words : SiC, Sintering, Electrical resistivity [Received January 5, 2012; Accepted February 28, 2012] Silicon carbide (SiC) is considered to be a suitable material for various structural applications such as mechanical seals, bearings, cylinder liners, armor plates, and mirror materials for astronomical telescopes due to its superior properties of high hardness, high temperature strength, and excellent resistance to wear and corrosion.1)6) In addition, SiC ceramics with or without a small amount of additives have attracted considerable attention for use in semiconductor processing, nuclear fusion reactors, and high temperature thermomechanical applications because of their excellent chemical and thermal stability and good mechanical properties.7)11) In the mid 1970s, Lange 12) first reported on the successful densification of SiC by liquid-phase sintering with the addition of Al 2 O 3 as a sintering additive. Since this innovative work, interest in liquid-phase sintered (LPS)-SiC has grown continuously because such materials exhibit better mechanical properties than solid-state sintered SiC ceramics.2),6),13)17) Methods for the successful densification of SiC ceramics with a smaller amount of sintering additives via liquid-phase sintering include (1) the use of colloidal processing for the homogeneous distribution of sintering additives 18),19) and (2) the addition of in situsynthesized nano-sized SiC into submicron-sized SiC powders. 20) In this study, the sinterability of four different commercially available SiC powders was investigated with the addition of 1 wt % AlNDy 2 O 3 additives by hot pressing. The effect of the SiC powder characteristics on the electrical resistivity of the hot-pressed SiC ceramics was also investigated. The AlNDy 2 O 3 additive system was selected because of the success of previous research on the densification of SiC with AlN-rare earth oxide systems 4),11) and the good chemical stability of Dy 2 O 3 at high temperatures in the presence of SiC. 21)Four types of commercially available SiC powders were used as starting materials; their characteristics are shown in Table 1. The crystalline phase of powders A1 and A2 is ¡-SiC, while that of B1 and B2 is ¢-SiC. 22) The mixtures were dried, sieved (60 mesh), pressed uniaxially, and heat-treated at 200°C for 2 h in air so ...

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Study of Fracture Behavior of Very Fine‐Grained Silicon Carbide Ceramics

Cited by 48 publications

References 14 publications

Densification, microstructure, and mechanical properties of ZrC–SiC ceramics

Densification, microstructure, and mechanical properties of ZrC–SiC ceramics

Handbook of SiC properties for fuel performance modeling

Influence of powder characteristics on the electrical resistivity of SiC ceramics

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