Fracture toughness (KIC), hardness, sintering and grain growth behaviour of 8YSCZ/Al2O3 composites produced by colloidal processing

Tekeli, Süleyman

doi:10.1016/j.jallcom.2004.08.084

Cited by 55 publications

(12 citation statements)

References 10 publications

(15 reference statements)

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“…Indentation tests were conducted on polished samples with a load of 10 kg held for 20 s. The hardness (H v ) was calculated from the diagonal length of the indentation determined by SEM observation using the following equation 22 :…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Suppression of grain growth in sub-micrometer alumina via two-step sintering method

Hesabi

Haghighatzadeh

Mazaheri

et al. 2009

Journal of the European Ceramic Society

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Section: Mechanical Propertiesmentioning

confidence: 99%

Suppression of grain growth in sub-micrometer alumina via two-step sintering method

Hesabi

Haghighatzadeh

Mazaheri

et al. 2009

Journal of the European Ceramic Society

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“…It has been previously reported that the excessive grain growth in yttria-stabilized cubic zirconia (8YSZ) is associated with a low rate of Y 2 O 3 precipitation at the grain boundaries. This in turn leads to a low cohesive strength between grain boundaries and a high grain boundary energy in the 8YSZ [25]. Consequently, in order to prevent grain growth, grain boundary mobility must be prevented and the grain boundary energy of the 8YSZ must be reduced.…”

Section: Introductionmentioning

confidence: 99%

Crystallization And Grain Growth Behavior Of La2O3-doped Yttria-stabilized Zirconia

Aktaş

Tekeli²,

Salman³

2014

Adv. Mater. Lett.

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The effect of La 2 O 3 addition on the microstructure and grain growth behavior of yttria-stabilized zirconia (8YSZ) was investigated. To this end, 8YSZ was doped with 1-15 wt% La 2 O 3 by means of colloidal processing, and then sintered at 1550 °C for 1 h. XRD results identified a dissolution limit of 5 wt% La 2 O 3 in 8YSZ, the insoluble La 2 O 3 at higher concentrations reacting with ZrO 2 during sintering to form a secondary La 2 Zr 2 O 7 phase. Both undoped and La 2 O 3 -doped 8YSZ specimens were annealed at 1400, 1500, and 1600 °C for 10, 50, and 100 h to induce grain growth. Grain growth measurement results showed that an increase in annealing temperature and holding time caused to grain growth in all specimens. Excessive grain growth was observed in the case of the undoped, and 1-5 wt% La 2 O 3 -doped 8YSZ specimens; however, the grain growth in 10 and 15 wt% La 2 O 3 -doped 8YSZ was inhibited by the formation of a pyrochloric La 2 Zr 2 O 7 secondary phase around the grains and grain boundaries of 8YSZ. Grain growth exponent (n) and activation energy (Q) values for grain growth of undoped 8YSZ were obtained as 3, and 358 kJ/mol, respectively, while 15 wt% La 2 O 3 containing specimens had a grain growth exponent of 3, and activation energy of 413 kJ/mol. These results indicate that grain growth rate can be controlled by the addition of 10 or 15 wt% La 2 O 3 .

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“…For single phase and normal grain growth, n usually takes a value of 2 [13]. In our present work n is taken as 2.…”

Section: Resultsmentioning

confidence: 99%

Densification and grain growth behavior of highly dense MgO ceramics in pressureless sintering

Song

Qin

et al. 2015

Ceramics International

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Fracture toughness (KIC), hardness, sintering and grain growth behaviour of 8YSCZ/Al2O3 composites produced by colloidal processing

Cited by 55 publications

References 10 publications

Suppression of grain growth in sub-micrometer alumina via two-step sintering method

Suppression of grain growth in sub-micrometer alumina via two-step sintering method

Crystallization And Grain Growth Behavior Of La2O3-doped Yttria-stabilized Zirconia

Densification and grain growth behavior of highly dense MgO ceramics in pressureless sintering

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