Mechanical properties of hot-forged silicon carbide ceramics

Lee, Sung‐Hee; Lee, Young-Il; Kim, Young‐Wook; Xie, Rong‐Jun; Mitomo, Mamoru; Zhan, Guo‐Dong

doi:10.1016/j.scriptamat.2004.09.012

Cited by 56 publications

(22 citation statements)

References 19 publications

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“…This suggests that SiC phases, being rod-like, did not lose reinforcing effect. For SiC, since the toughness values reported for hot-pressed 24) and hot-forged 25) SiC polycrystals are lower than or nearly equal to WC, 3.8 to 5.9 MPaÁm À1=2 , SiC phases in shape of whiskers or fine particles need to be dispersed for toughening a matrix WC phase. Consequently, decreasing whisker aspect ratio caused the fracture toughness decrease above 1650 C. The reason why the addition of only 3 vol% SiC W greatly increased the fracture toughness could not be clarified in this study.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Preparation of WC-SiC Whisker Composites by Hot Pressing and Their Mechanical Properties

Sugiyama¹,

Kudo

Taimatsu

2008

Mater. Trans.

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Composites of WC and SiC whisker (0-30 vol% SiC) were prepared at 1550 to 1800 C by using a resistance-heated hot pressing technique called spark plasma sintering. The composites obtained were examined for reaction products and microstructure, and were characterized for mechanical properties. The addition of small amounts of SiC induced the marked grain growth of WC, and drove the densification of WC. Above 10 vol% SiC, dispersed SiC phases impeded the grain growth of WC. Increasing sintering temperature made SiC whiskers thick and lowered the aspect ratio of whiskers. The hardness of composites decreased with increasing average grain size of WC. The Young's modulus of dense composites was decreased with the SiC content. The addition of 3 to 5 vol % SiC greatly increased the fracture toughness of WC.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Preparation of WC-SiC Whisker Composites by Hot Pressing and Their Mechanical Properties

Sugiyama¹,

Kudo

Taimatsu

2008

Mater. Trans.

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“…17),18) Lee et al 19) used Y3Al5O12 (YAG) as a sintering additive to densify a submicrometer-sized SiC powder by hotpressing at 1800°C. The hot-forging after the densification of SiC at 1900°C enhanced greatly the strength to 1150 MPa.…”

Section: Reviewmentioning

confidence: 99%

Processing of high performance silicon carbide

Hirata

Matsunaga

Hidaka

et al. 2008

J. Ceram. Soc. Japan

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Liquid phase sintering based on the dissolution-precipitation mechanism was applied to densify a 0.8 micrometer SiC powder with alumina (1.2 vol%)-yttria (0.9-3.3 vol%) additives. To uniformly distribute the sintering additives around the SiC particles, a heterocoagulated particle network was formed among negatively charged SiC particles, positively charged 0.2 micrometer alumina and yttrium ions in an aqueous suspension at pH 5. Yttrium ions were electrostatically adsorbed on the negatively charged SiC surfaces. The consolidated green compacts were highly sintered to 97-99% of theoretical density by hot-pressing at 1950°C. The mechanical properties (four-point strength, fracture toughness and Weibull modulus) were highly enhanced when a bimodal particle size system of SiC (0.8 micrometer-30 nanometer SiC) was sintered. The maximum strength of 75 vol% 0.8 micrometer SiC-25 vol% 30 nanometer SiC reached 1.1 GPa at room temperature. The fracture toughness was about 6 MPa·m 1/2 and the Weibull modulus was 5.9. When a small amount of SiC precursor polymer was infiltrated in the green compact, the strength and Weibull modulus were further improved.

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“…Grain rotation during hot forging was suggested as a possible mechanism for texture development. Lee et al [15] developed SiC ceramics with an anisotropic microstructure by hot forging a hot-pressed SiC specimen at 1900°C for 4 h under a constant pressure of 25 MPa. The anisotropic microstructure was developed by the β→α transformation of SiC during hot forging.…”

Section: Introductionmentioning

confidence: 99%

Effect of hot-forging on mechanical properties of silicon carbide sintered with Al2O3-Y2O3-MgO

Roh

Kim

et al. 2010

Met. Mater. Int.

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The mechanical properties of hot-pressed and hot-forged SiC were investigated. The hot -forging of the hotpressed SiC was carried out at 1700°C for 66 h under an applied pressure of 25 MPa in an argon atmosphere. The microstructures on the surfaces parallel and perpendicular to the pressing direction of the hot-pressed and hot-forged SiC were similar, and no texture development was observed because of the lack of massive β→α transformation of SiC. An increase in hardness of about 13 % and fracture toughness of about 33 % was achieved in the hot-forged specimens compared to the hot-pressed specimens.

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Mechanical properties of hot-forged silicon carbide ceramics

Cited by 56 publications

References 19 publications

Preparation of WC-SiC Whisker Composites by Hot Pressing and Their Mechanical Properties

Preparation of WC-SiC Whisker Composites by Hot Pressing and Their Mechanical Properties

Processing of high performance silicon carbide

Effect of hot-forging on mechanical properties of silicon carbide sintered with Al2O3-Y2O3-MgO

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