Crack-healing behavior and bending strength of Si3N4/SiC composite ceramics by SiO2 colloidal

Nam, Kyoung Won; Kim, Mi Kyung; Park, Sung Won; Ahn, Seok Hwan; Kim, Jong Soon

doi:10.1016/j.msea.2007.03.005

Cited by 24 publications

(5 citation statements)

References 11 publications

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“…(a) Non-destructive inspection with very high ability, (b) Increase fracture toughness by fiber-reinforcement and decrease the sensitivity to crack, (c) Introduce self-crack-healing ability. It has also been reported that the cracks formed by machining were healed completely [15,16]. In particular, some results suggest that the cracks in silicon carbide, once healed, surprisingly become even stronger than the original silicon carbide.…”

Section: Introductionmentioning

confidence: 91%

Effect of Crack Healing of SiC according to Times of SiO₂Colloid Coating

Nam

2013

Journal of Powder Technology

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Crack healing behavior of SiC ceramics with large crack width has been studied as a function of coating and heat treatment. The SiO2colloid coating was carried out on two types: hydrostatic pressure coating and roll coating. The crack healing was one hour at 1173 K in air. The crack part formed SiO2oxides until the critical times by a hydrostatic pressure method. The crack does not anymore heal if it exceeds the critical times. The crack part and the base part have many O components and Si components regardless of the times of coating and heat treatment. The combined hydrostatic and rolling coating method did not have nearly an effect on crack-healing for large crack width over 1.4 μm. The study for more effective healing of a large crack width must be carried out in the future.

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Section: Introductionmentioning

confidence: 91%

Effect of Crack Healing of SiC according to Times of SiO₂Colloid Coating

Nam

2013

Journal of Powder Technology

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“…Many studies have reported that crack healing in ceramics increases strength [6][7][8][9][10]. It has also been reported that the cracks formed by machining were healed completely [11,12].…”

Section: Introductionmentioning

confidence: 99%

Critical crack size of healing possibility of SiC ceramics

Nam

Kim²

2010

Materials Science and Engineering: A

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“…In such reports, the ceramics had been composited with other phases such as SiC and Ni. The ability of these ceramic‐based composites to recover their mechanical strength through self‐crack‐healing after a high‐temperature treatment has been extensively studied . Theheat‐induced crack‐healing mechanism is attributed to the resintering of cracks by secondary sintering, followed by filling of the cracks by oxidation reaction, the diffusion of the constituent elements and oxide formation .…”

Section: Introductionmentioning

confidence: 99%

Electrochemically assisted room‐temperature crack healing of ceramic‐based composites

et al. 2019

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We demonstrated for the first time the room-temperature crack healing in ceramic-based composites. For this purpose, 20 and 30 vol% of fine titanium metal (Ti) were homogeneously dispersed in electrically insulating alumina (Al 2 O 3 ) ceramic to obtain composites that exhibited excellent electrical conductivity. Electrochemical anodization at room temperature was used to successfully heal cracks induced in the Al 2 O 3 /Ti composites and recover their fracture strength and reliability. The bending strength of as-prepared, crack-induced, and electrochemically healed composites was measured to evaluate the crack-healing ability. Moreover, the effects of the anodization current density, crack size (including length and crack open distance), and the conductivity of the composites on their crack-healing behavior were investigated and discussed. The results indicate that the bending strength of crack-induced composites, which was approximately 61% of the crack-free composite strength, was completely recovered after the crack-healing procedure at room temperature under appropriate anodization conditions. The titanium oxides obtained after anodization formed bridges that healed the crack; this was considered to be the main strength recovery mechanism. By anodizing Al 2 O 3 /Ti composites, we developed a new and convenient approach to heal cracks and recover the fracture strength of cracked ceramics at room temperature.

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Crack-healing behavior and bending strength of Si3N4/SiC composite ceramics by SiO2 colloidal

Cited by 24 publications

References 11 publications

Effect of Crack Healing of SiC according to Times of SiO₂Colloid Coating

Effect of Crack Healing of SiC according to Times of SiO₂Colloid Coating

Critical crack size of healing possibility of SiC ceramics

Electrochemically assisted room‐temperature crack healing of ceramic‐based composites

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Crack-healing behavior and bending strength of Si3N4/SiC composite ceramics by SiO2 colloidal

Cited by 24 publications

References 11 publications

Effect of Crack Healing of SiC according to Times of SiO2Colloid Coating

Effect of Crack Healing of SiC according to Times of SiO2Colloid Coating

Critical crack size of healing possibility of SiC ceramics

Electrochemically assisted room‐temperature crack healing of ceramic‐based composites

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Product

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Effect of Crack Healing of SiC according to Times of SiO₂Colloid Coating

Effect of Crack Healing of SiC according to Times of SiO₂Colloid Coating