Toughening and hardening in double-walled carbon nanotube/nanostructured magnesia composites

Peigney, Alain; García, Felipe Legorreta; Estournès, Claude; Weibel, Alicia; Billon, Laurent

doi:10.1016/j.carbon.2010.01.063

Cited by 71 publications

(43 citation statements)

References 55 publications

(97 reference statements)

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“…CNTs are useful for improving the properties of advanced CMCs [4,5,[7][8][9][10][11], they can also be used to produce fine monolithic ceramics, as presented for the first time in this paper. In ceramic -CNT composites, hardness depends more on the presence of lubricating CNTs at the grain boundaries than on fine grain size.…”

Section: Resultsmentioning

confidence: 97%

“…Such results were previously only possible when very high pressures (1)(2)(3)(4)(5)(6)(7)(8) were used during the sintering of alumina [46][47][48][49]. For example, Liao et al [49] applied 8 GPa pressure during conventional lengthy sintering process to produce a microstructure having a mean grain size of 50 nm using 18 nm starting powder alumina.…”

Section: Post-heat Treatment Analysismentioning

confidence: 99%

“…Since Iijima's report [1], CNTs have been widely appreciated for producing advanced polymer [2,3], ceramic [4,5] and metal [6] composites. In the case of ceramic matrix composites (CMCs) [7], CNTs have been reported to improve the electrical conductivity [4,5], thermal conductivity [8], fracture strength [5] machinability [9], indentation fracture toughness [10], and contact damage resistance [11].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of ceramic matrix composites (CMCs) [7], CNTs have been reported to improve the electrical conductivity [4,5], thermal conductivity [8], fracture strength [5] machinability [9], indentation fracture toughness [10], and contact damage resistance [11]. We recently reported that CNT addition significantly retards grain growth and lowers the full densification sintering temperature of polycrystalline CMCs [12].…”

Section: Introductionmentioning

confidence: 99%

“…This nullifies the effect of fine alumina grains produced by the presence of CNTs at the grain boundaries of the composite. Some papers have reported no effect [28] or improved hardness [5,[29][30][31] by the incorporation of CNTs. However, the improvements were marginal and no comments were presented on the interfacial interactions between hard ceramic particles and the lubricating CNTs.…”

Section: Introductionmentioning

confidence: 99%

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The production of advanced fine-grained alumina by carbon nanotube addition

Inam

Peijs

Reece

2011

Journal of the European Ceramic Society

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Alumina and alumina+1vol.% carbon nanotube (CNT) composites were fully densified by spark plasma sintering. Post-sintering heat treatments (1300-1500 •C) were performed to completely oxidize CNTs and then densify the remaining 1 vol.% to produce fine-grained ceramics. The grain size and Vickers hardness of the heat-treated composites were compared with the monolithic alumina sintered without CNT addition. Compared to the initial powder particle size of alumina (D50: 356±74 nm), minimal grain growth (∼450 nm) was observed for the fully dense heat-treated composites. A 25% improvement in Vickers hardness and >10 times finer average grain size were observed for alumina produced by the heat treatment (1300 •C) of alumina+1vol.% CNT composite, compared to alumina sintered without CNTs. Alumina and alumina + 1 vol.% carbon nanotube (CNT) composites were fully densified by spark plasma sintering. Post-sintering heat treatments (1300 -1500 o C) were performed to completely oxidize CNTs and then densify the remaining 1 vol.% to produce fine-grained ceramics. The grain size and Vickers hardness of the heat-treated composites were compared with the monolithic alumina sintered without CNT addition. Compared to the initial powder particle size of alumina (D 50 : 356 nm ± 74 nm), minimal grain growth (~450 nm) was observed for the fully dense heat-treated composites. A 25% improvement in Vickers hardness and >10 times finer average grain size were observed for alumina produced by the heat treatment (1300 o C) of alumina + 1 vol.% CNT composite, compared to alumina sintered without CNTs. Introduction

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