Toughening Behavior in Whisker‐Reinforced Ceramic Matrix Composites

Becher, Paul; Hsueh, Chun‐Hway; Angelini, P.; Tiegs, T.N.

doi:10.1111/j.1151-2916.1988.tb05791.x

Cited by 551 publications

(149 citation statements)

References 35 publications

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“…4,[6][7][8][9][10][11] The nature of these amorphous intergranular films was shown to consist mainly of Al-O-Si-C 11 or Al-O-C, 12,13 and to provide a path for intergranular crack propagation. Elastic bridging and pullout of the interlocked SiC grains 4,5,14 contributed to the toughening, 2,[15][16][17] leading to fracture toughness of as high as 9…”

Section: Introductionmentioning

confidence: 99%

Thermal Modification of Microstructures and Grain Boundaries in Silicon Carbide

Zhang

Jonghe

2003

J. Mater. Res.

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Section: Introductionmentioning

confidence: 99%

Thermal Modification of Microstructures and Grain Boundaries in Silicon Carbide

Zhang

Jonghe

2003

J. Mater. Res.

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“…The CNT/alumina composite usually showed the greatest improvement in fracuture toughness at 1 , 10 vol% CNT concentration and whisker-reinforced alumina at .10 vol% 35 . This high amount of CNTs or whisker for toughening impedes considerably sintering of ceramics, which requires highpressure densification processes such as hot pressing and spark plasma sintering.…”

Section: Discussionmentioning

confidence: 99%

Percolative Electrical Conductivity of Platy Alumina/Few-layer Graphene Multilayered Composites

Choi¹,

Kim²,

Lee³

et al. 2017

J. Korean Ceram. Soc

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It is of critical importance to improve toughness, strength, and wear-resistance together for the development of advanced structural materials. Herein, we report on the synthesis of unoxidized graphene/alumina composite materials having enhanced toughness, strength, and wear-resistance by a low-cost and environmentally benign pressure-less-sintering process. The wear resistance of the composites was increased by one order of magnitude even under high normal load condition (25 N) as a result of a tribological effect of graphene along with enhanced fracture toughness (K IC ) and flexural strength (s f ) of the composites by ,75% (5.60 MPa?m 1/2 ) and ,25% (430 MPa), respectively, compared with those of pure Al 2 O 3 . Furthermore, we found that only a small fraction of ultra-thin graphene (0.25-0.5 vol%, platelet thickness of 2-5 nm) was enough to reinforce the composite. In contrast to unoxidized graphene, graphene oxide (G-O) and reduced graphene oxide (rG-O) showed little or less enhancement of fracture toughness due to the degraded mechanical strength of rG-O and the structural defects of the G-O composites.A tomically thin graphene is one of the strongest materials; therefore, it is promising as a toughening/ strengthening agent in ceramic-based structural materials 1 . Smaller nano-scale graphene, compared to conventional whisker/fiber reinforcement, would induce smaller flaws, potentially resulting in higher strength/toughness 2 . Considering the enormous surface area of graphene (e.g. single-layer graphene ,2630 m 2 / g), surprisingly small amounts of graphene would be enough to satisfy complete coverage of precursor nanoparticles (less than 1.0 vol%). In the case of carbon nanotube (CNT), it has been reported that higher reinforcement concentration (1 , 10 vol%) was generally required for the toughening and strengthening of CNT/ceramic composites [2][3][4][5][6][7][8] . Moreover, graphene is a good candidate for solid lubrication that reduces the friction force between contact surfaces at micro-and nano-scale while protecting the coated surface [9][10] . A nanometer-thick surface layer of hard, strong, and lubricating graphene on ceramic grains can lead to a significant improvement in contact-damage resistance, such as wear resistance due to a tribological effect of 2-dimensional (2D) graphene. However, previous studies on graphene tribology have focused on nano-scale friction and wear behavior (normal load ,250 mN) [9][10][11] . On the other hand, micro-/macro-scale tribological studies of graphene have remained relatively unexplored, but there is an increasing need to utilize graphene's full potential for diverse tribological applications. There has been no report on the friction and wear behavior of ceramic-based graphene composites in micro-and macro-scale under high normal load (.20 N), which is important for contact-mechanical applications (e.g. bearing, valves, nozzles, armour, prostheses) and protective coating applications.Structural materials for extreme environments (e.g. high temperature/press...

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“…A small transverse grain size was shown to give higher Weibull modulus than the coarse microstructures. The observed increase in fracture resistance was mainly attributed to crack deflection, and crack bridging mechanism [3][4][5][6] . In some cases crack branching was also observed.…”

Section: Introductionmentioning

confidence: 97%

Development of the microstructure of the silicon nitride based ceramics

1999

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Basic regularities of silicon nitride based materials microstructure formation and development in interrelation with processing conditions, type of sintering additives, and starting powders properties are discussed. Models of abnormal or exaggerated grain growth are critically reassessed. Results of several model experiments conducted in order to determine the most important factors directing the microstructure formation processes in RE-fluxed Si3N4 ceramics are reviewed. Existing data on the mechanisms governing the microstructure development of Si3N4-based ceramics are analyzed and several principles of microstructure tailoring are formulated.

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Toughening Behavior in Whisker‐Reinforced Ceramic Matrix Composites

Cited by 551 publications

References 35 publications

Thermal Modification of Microstructures and Grain Boundaries in Silicon Carbide

Thermal Modification of Microstructures and Grain Boundaries in Silicon Carbide

Percolative Electrical Conductivity of Platy Alumina/Few-layer Graphene Multilayered Composites

Development of the microstructure of the silicon nitride based ceramics

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