湿式ジェットミル処理したアルミナスラリーの鋳込み成形

Omura, Naoki; Hotta, Yuji; Sato, Kimiyasu; Kinemuchi, Yoshiaki; Kume, Shinji

doi:10.2109/jcersj.113.495

Cited by 22 publications

(11 citation statements)

References 21 publications

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“…After ball milling, however, ceramic particles in a slurry have a tendency to reflocculate due to an increase in the number of the active sites induced on the surface of particles by the impact and shearing action of the grinding medium. [21][22][23][24][25] Recently, in our previous works, [25][26][27] it has been demonstrated that wet-jet-milled slurries exhibited distinctly different stability behavior compared with ball-milled ones in terms of reflocculation efficiency, rheological properties, and packing density. The viscosity of the ball-milled slurry increased rapidly with time, whereas the viscosity of the wet-jet-milled slurry was stable for a long time at a value of B10 mPa Á s. In addition, the wet-jet-milled slurry was less reflocculated compared with the ball-milled one.…”

Section: Introductionmentioning

confidence: 99%

State of the Dispersant and Particle Surface During Wet‐Jet Milling for Preparation of a Stable Slurry

Hotta

Yılmaz

Shirai

et al. 2008

Journal of the American Ceramic Society

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Wet‐jet‐milled alumina slurries exhibited distinctly different stability behavior compared with ball‐milled ones in terms of reflocculent efficiency and rheological properties. The distinction was attributed to the different behavior of the same dispersant (NH4+ salt of poly(acrylic acid); PAA–NH4+) in ball milling and wet‐jet milling. Alumina particles after the wet‐jet milling retained the initial surface conditions, although ball‐milled alumina particles yielded more hydroxyl groups on the surface. Furthermore, degradation of dispersant on milling was investigated qualitatively. Infra‐red analysis and isoelectric point measurements suggested that degradation of the dispersant occurred during ball milling, indicating neutralization of the dispersant due to formation of monodentate COOX groups. On the other hand, in the case of wet‐jet milling, COO− groups of PAA–NH4+ were not degraded at all, indicating maintenance of the structures of dispersant with electrostatic repulsion. Change in the polymer size of the dispersant by different milling methods was confirmed using high performance liquid chromatography (HPLC) measurements. The HPLC results of the wet‐jet milled samples showed that a dispersant with a larger molecular size was generated. Force measurement on approach via the colloid probe method in the centrifuged supernatant of the milled slurries confirmed that the interaction distance between an α‐alumina colloid probe and c‐sapphire surface was about two times larger in the wet‐jet‐milled slurry supernatant compared with the ball milled one. Thus, it was found that wet‐jet milling process led to a stable slurry because of the maintenance of not only steric repulsion but also electrostatic repulsion.

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Section: Introductionmentioning

confidence: 99%

State of the Dispersant and Particle Surface During Wet‐Jet Milling for Preparation of a Stable Slurry

Hotta

Yılmaz

Shirai

et al. 2008

Journal of the American Ceramic Society

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“…Using these effects, the grain refinement, emulsification, and homogenization are achieved within a short period of time. In our previous works, 21,22 wet jet milling was used as a new method to prepare the ceramics slurry and it was shown that the wet jet-milled slurries had very low viscosity and the green bodies fabricated from wet jet-milled slurry had a high relative density of about 65%.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Stable Al₂O₃ Slurries and Dense Green Bodies Using Wet Jet Milling

Omura

Hotta

Sato

et al. 2006

Journal of the American Ceramic Society

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A wet jet milling process was used as a novel method to prepare Al2O3 slurries. The wet jet‐milled slurries showed very low viscosity compared with the ball‐milled slurries. Moreover, the viscosity of the wet jet‐milled slurries was constant for long times, whereas that of the ball‐milled slurries increased rapidly with time. Al2O3 particles after wet jet milling retained initial surface conditions, although Al2O3 particles after ball milling yielded more OH groups on the surface. Casting rate was sensitive to the solid content and preparation method of slurry. The relative density of the green bodies prepared from the wet jet‐milled slurries was about 65% or more and was independent of the slurry solid content. On the other hand, the relative density of the green bodies prepared from the ball‐milled slurries increased with increasing solid content and was higher than 60% at the solid content of 50% by volume. Linear shrinkage of the sintered bodies prepared from the wet jet‐milled slurries was very low and independent of the solid content of the slurry whereas that of the sintered bodies prepared from the ball‐milled slurries increased with decreasing solid content.

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“…It is known that the casting rate of slip casting is affected by capillary pressure of mold and permeability of green body. 19,20 The permeability of green body can be given as;…”

Section: ࣽ10mentioning

confidence: 99%

Planetary Homogenizing of Al2O3 Slurries

Omura¹,

Hotta²,

Sato³

et al. 2005

J. Ceram. Soc. Japan

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ȪɳɧɒɁɱɲʀǽƻᆈɣɪɀɒȬȾʀᥴ ቧᬼẃɿࣦᨀⓖ‫ۦ‬ɿΤ⍪ӸᗬɿኋՊῲᅽɿḞ ᓺలɿᚡ౺‫ۦ‬ ᧳Ꮱཪ⒈ἕ۰ᮾ᳣ཀӞƣ⓯ƗɟɵɃɁᮾ᳣ȤϘࢫ463-8560 ᮪᭔۵‫ୖے‬లમ୮ٚˁᔲ‫ܬ‬᳡ɾᗻ 2266-98 A planetary homogenizing was employed as a novel method to prepare Al 2 O 3 slurries. The planetaryhomogenized slurries showed very low viscosity, compared to the ball-milled slurries. Moreover, the viscosity of the planetary-homogenized slurries was stable for long times, whereas that of the ball-milled slurries increased rapidly with time. Casting rate of planetary-homogenized slurries was more sensitive to the solid content of slurry than that of the ball-milled slurries. The relative density of the green bodies prepared from the planetaryhomogenized slurries was about 60ಚ or more and was independent of the slurry solid content. On the other hand, the relative density of the green bodies from the ball-milled slurries changed depending on the solid content and was higher than 60ಚ at the solid content of 50ಚ by volume. Linear shrinkage of the sintered bodies prepared from the planetary-homogenized slurries was very low and independent of the solid content; as compared to that observation the sintered bodies prepared from ball-milled slurries, which increased with decreasing solid content.

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湿式ジェットミル処理したアルミナスラリーの鋳込み成形

Cited by 22 publications

References 21 publications

State of the Dispersant and Particle Surface During Wet‐Jet Milling for Preparation of a Stable Slurry

State of the Dispersant and Particle Surface During Wet‐Jet Milling for Preparation of a Stable Slurry

Fabrication of Stable Al₂O₃ Slurries and Dense Green Bodies Using Wet Jet Milling

Planetary Homogenizing of Al2O3 Slurries

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湿式ジェットミル処理したアルミナスラリーの鋳込み成形

Cited by 22 publications

References 21 publications

State of the Dispersant and Particle Surface During Wet‐Jet Milling for Preparation of a Stable Slurry

State of the Dispersant and Particle Surface During Wet‐Jet Milling for Preparation of a Stable Slurry

Fabrication of Stable Al2O3 Slurries and Dense Green Bodies Using Wet Jet Milling

Planetary Homogenizing of Al2O3 Slurries

Contact Info

Product

Resources

About

Fabrication of Stable Al₂O₃ Slurries and Dense Green Bodies Using Wet Jet Milling