Preparation of lightweight porcelains using various types of pore-forming additives and their mechanical properties

Pee, Jae-Hwan; Kobayashi, Yuichi; Katayama, Masaki; Kim, Geun-Hee; Kim, Yoo-Jin

doi:10.2109/jcersj2.122.204

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…The relationship between the Young's modulus and the density of sintered porcelain Q-0, Q-6, Q-12 and Q-17 with a bulk density of 2.4 g cm ¹3 or more was agreed well with the relationship E/E 0 = (d/d 0 ) 2 , where E/E 0 was relative Young's modulus and d/d 0 was relative density reported by the authors about the lightweight porcelain. 12) On the other hand, the Young's modulus of the quartz-free porcelain Q-0 and quartz added other samples Q-6, Q-12, Q-17 and Q-26 decreased abruptly when the bulk density decreased below 2.4 g•cm ¹3 . The decrease in Young's modulus was even more pronounced in the coarse quartz added porcelains, and even at a bulk density of 2.35 g•cm ¹3 (assuming a true density of 2.5 g cm ¹3 , the relative density is 2.35/2.50 = 94 %), the Young's modulus decreased to less than half probably due to the occurrence of microcracks induced by the internal stress that occurs around the quartz grains during cooling.…”

Section: Elastic Propertiesmentioning

confidence: 99%

Effect of quartz grain size on elastic and thermal expansion properties of porcelain

Kobayashi,

Maekawa,

Okuno

et al. 2023

J. Ceram. Soc. Japan

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Quartz powders having different particle size distributions were mixed with feldspar and kaolin to make traditional porcelain bodies. The effects of quartz particle size on the elastic modulus and thermal expansion characteristics of these porcelains were investigated. Porcelain bodies prepared from quartz particles finer than 20 ¯m and heat-treated between 1275 and 1300 °C showed Young's modulus 80 GPa or higher, and showed coefficient of thermal expansion (CTE) above 6 © 10 ¹6 /K. Porcelain bodies prepared from coarser quartz particles in size showed elastic modulus 35 GPa or lower, and the CTE below 5.3 © 10 ¹6 /K. These differences were caused by sufficient sintering and microcracks due to the difference in thermal expansion between quartz and glass-mullite matrix, and the critical quartz grain size for microcracks in porcelain was found to be in the range of 2032 ¯m. Wearability and polishing performance of abrasive media with varying Young's modulus were also studied.

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Section: Elastic Propertiesmentioning

confidence: 99%

Effect of quartz grain size on elastic and thermal expansion properties of porcelain

Kobayashi,

Maekawa,

Okuno

et al. 2023

J. Ceram. Soc. Japan

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Pore characteristics and phase compositions of porous corundum-mullite ceramics prepared from kaolinite gangue and Al(OH)<sub>3</sub> with different amount of CaCO<sub>3</sub> addition

Yan

Chen

Lin

et al. 2015

J. Ceram. Soc. Japan

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Porous corundum-mullite ceramics were prepared from Al(OH) 3 and kaolinite gangue with different CaCO 3 amount through an in-situ decomposition pore-forming technique. The effect of the amount of CaCO 3 added (ACA) on the phase compositions and pore characteristics was investigated through X-ray diffractometer (XRD), scanning electron microscopy (SEM), and mercury porosimetry measurements, etc. It's interesting that the granular mullite crystals are in the Al(OH) 3 pseudomorphs but the needle-like mullite crystals are in the gangue pseudomorphs, and found that the ACA slightly affects the apparent porosity (AP), but strongly affects the formation of liquid phase, and then affects the secondary mullitization, microstructure, pore size distribution and crystal morphology. With an increase in ACA from 0 to 2.36 wt %, the increasing liquid phase make the rate of secondary mullitization increase markedly; when the ACA is 2.36 wt %, the secondary mullitization reaches the maximum; with a further increase of ACA to 3.54 wt %, the secondary mullitization decreases due to the formation of anorthite. With an increase in ACA from 0 to 3.54 wt %, the APs are in the range of 40.742.3%, whereas, the average pore size increases from 0.326 to 2.750¯m, and the crystal sizes of mullite in both pseudomorphs increase evidently.

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Preparation of lightweight porcelains using various types of pore-forming additives and their mechanical properties

Cited by 2 publications

References 13 publications

Effect of quartz grain size on elastic and thermal expansion properties of porcelain

Effect of quartz grain size on elastic and thermal expansion properties of porcelain

Pore characteristics and phase compositions of porous corundum-mullite ceramics prepared from kaolinite gangue and Al(OH)<sub>3</sub> with different amount of CaCO<sub>3</sub> addition

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