Highly porous ZrO2 ceramics fabricated by a camphene-based freeze-casting route: Microstructure and properties

Han, Jiecai; Hong, Changqing; Zhang, Xinghong; Du, Jiancong

doi:10.1016/j.jeurceramsoc.2009.08.018

Cited by 93 publications

(43 citation statements)

References 23 publications

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“…It is well established that the pore structure of freezecast materials is a direct replica of the solidified solvent structure [40][41][42]. As camphene tends to solidify in a dendritic fashion [43], its use as the solvent in freeze-casting gave rise to materials with dendritic pore channels [44][45][46]. It can be noticed from micrographs 5A to 5C that camphene dendrites grew macroscopically with a preferential orientation similar to the freezing direction, leading to elongated aligned pores and short secondary channels in the sintered body.…”

Section: Characterizationmentioning

confidence: 99%

Effect of titania addition on the properties of freeze-cast alumina samples

Silva

Nunes

Souza

et al. 2015

Ceramics International

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This work investigated the behavior of TiO 2 -containing α-Al 2 O 3 samples prepared by the freeze-casting technique. Camphene and liquid nitrogen were used as the solvent and cooling fluid, respectively. Camphene resulted in the formation of dendritic pores, in the direction of the freeze-casting cold front during sample preparation. The formation of β-Al 2 TiO 5 phase occurred at 1300 °C, and became more evident as the sintering temperatures reached 1500 °C. The TiO 2 loading did not affect the sample porosity at a given temperature, but it was detrimental in the case of mechanical properties under certain conditions. For instance, the flexural strength slightly improved with increasing the TiO 2 loading and sintering temperature from 1100 to 1300 °C. This effect was attributed to the occurrence of a more effective sintering of alumina.However, as the heat treatment temperature was raised from 1300 to 1500 °C, the flexural strength did not increase as a function of the TiO 2 loading, even though the densification occurred with loss of porosity. The loss of mechanical strength was found to be associated with the formation of microcracks which stemmed from the formation of β-Al 2 TiO 5 phase for TiO 2 loadings in excess of 4 wt% at these high sintering temperatures.

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Section: Characterizationmentioning

confidence: 99%

Effect of titania addition on the properties of freeze-cast alumina samples

Silva

Nunes

Souza

et al. 2015

Ceramics International

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“…The loading of the solid materials and sintering temperature significantly contributes to change of ceramic struts and porosity. [13] 3.3.5. XRD Analysis of ZrO 2 -SiO 2 Nanoparticles Composites XRD phase analysis of composites is shown in Figure 8.…”

Section: Hardness Measurements Of Zro 2 -Siomentioning

confidence: 99%

The Development and Characterization of Zirconia-Silica Sand Nanoparticles Composites

Ahmad¹,

Mamat²

2011

WJNSE

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The present study aims to develop zirconia-Silica sand nanoparticles composites through powder processing route and to study the physical properties, mechanical properties and microstructure of the composites. Zirconia based silica sand nanoparticles composite with 5, 10, 15 and 20 wt.% were developed through powder processing technique and sintered at 1500℃ for two hours. A decreasing trend of green density however an improvement in sintered density was observed. Also the addition of silica sand nanoparticles with 20 wt.% increased the hardness up to 12.45 GPa and microstructures indicated the diffusion mechanism of silica sand nanoparticles into pore sites of the composites.

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“…Many factors, including the composition and solid loading of slurry as well as sintering conditions, influence the microstructure and properties of porous ceramics fabricated by the freeze casting. For example, Han et al 15 adopted a camphene-based freeze casting method to fabricate ceramics with aligned, equiaxed pores, in which the pore volume fraction, channel size and pore shape were controlled by varying freezing temperature, solid content and sintering condition. Yoon et al 16 speed during the foaming process.…”

Section: Introductionmentioning

confidence: 99%