Effects of Grain Size, Shape and Second Phases on Properties of Sintered SiC

Karandikar, Prashant; Evans, G.; Wong, See Chang; Aghajanian, M. K.

doi:10.1002/9780470584330.ch7

Cited by 2 publications

(1 citation statement)

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“…It was found that subsequent to liquid phase sintering, silicon carbide which had undergone abnormal grain growth exhibited improved fracture toughness as a result of cracktip/crack-wake bridging by elongated abnormally large grains [18][19][20][21][22]. As silicon carbide is used in ceramic armour, enhanced fracture toughness is of great importance in this material [23]. Similar AGG-toughening effects were observed in doped β-phase Silicon Nitride (Si 3 N 4 ) [24-26] and have been proposed as a method for toughening alumina [27].…”

Section: Introductionmentioning

confidence: 99%

Abnormal grain growth of rutile TiO2 induced by ZrSiO4

Hanaor

Ferry

et al. 2012

Journal of Crystal Growth

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Abnormal grain growth (AGG) was observed in rutile TiO2 formed by the thermal treatment of anatase TiO2 in the presence of zirconium silicate. This morphological behaviour was seen to occur in sintered powder compacts and thin films with solid state zircon dopants and in TiO2 coatings on grains of zircon sand. In order to clarify the mechanism of AGG in this system, various doping methods were employed and the morphological consequences of these doping methods were investigated. It was found that doping by Zr and Si does not give rise to abnormal grain growth. The observed phenomena were discussed in terms of morphological and energetic considerations. It is likely that a distinct orientation relationship between rutile TiO2 and ZrSiO4 and possible grain boundary liquid formation play a role in giving rise to the rapid growth of faceted prismatic rutile

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