Influence of structural characteristics of alumina on the properties of aqueous suspensions and castings made from them

Rutman, D. S.; Permikina, N. M.; Shchetnikova, I. L.; Kelareva, E. I.

doi:10.1007/bf01398052

Cited by 3 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The maximum values are dependent on both experimental variables: the highest packing density (75.5%) is observed at 70 wt% (42.2 vol%) solids and 0.1-0.15 wt% dispersant. These results are in agreement with the trends that have been observed by Pivinskii and Bevz, 29 Rutman et al, 30 and Tarì et al 39 for bodies that have been prepared from electrostatically stabilized suspensions.…”

Section: (3) Characterization Of Slip-cast Bodies (A) Effect Of Diffesupporting

confidence: 92%

“…Vol'fson et al, 22 Verba and Degtyareva, 23 Rizzo et al, 24 and Smith et al 25 did not observe any relationship between solids loading and green density. Makarenkova, 26 Taguchi et al, 27 Chou and Lee, 28 and Hirata et al 9 observed a linear increase in packing density, whereas Pivinskii and Bevz 29 and Rutman et al 30 reported an initial increase of green density until a maximum was attained, followed by a decrease with increased solids loading.…”

Section: Introductionmentioning

confidence: 99%

“…[17][18][19][20][21] The influence of solids loading on slip and cast properties has been addressed by several authors. [22][23][24][25][26][27][28][29][30] However, these studies led to some controversial conclusions about the effect that the solids volume fraction in suspension has on packing density and green microstructure of slip-cast bodies. Vol'fson et al, 22 Verba and Degtyareva, 23 Rizzo et al, 24 and Smith et al 25 did not observe any relationship between solids loading and green density.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Solids Loading on Slip‐Casting Performance of Silicon Carbide Slurries

Ferreira

Diz

1999

Journal of the American Ceramic Society

View full text Add to dashboard Cite

The influence of solids loading and particle shape on the green microstructure of slip‐cast bodies was investigated. Three commercial silicon carbide (SiC) powders (two coarse varieties with the same particle‐size distribution (PSD) but different particle shapes and a finer powder) were used to prepare bimodal PSDs designed to maximize the packing density. Various surface‐active agents (anionic, cationic, and non‐ionic) were tested. Anionic dispersants were the most effective in dispersing aqueous SiC slurries. The effectiveness of dispersants was evaluated by sedimentation tests using very dilute slurries, by rheology, and by the packing density of slip‐cast bodies prepared from suspensions loaded with 62.5 wt% solids, stabilized with a fixed amount of dispersant (0.25 wt%, relative to the solids). Then, the best dispersant was selected to study the effects of dispersant and solids concentrations on the degree of packing of bimodal suspensions that contained the sharper‐edged coarse particles. It could be observed that the green density was dependent on both parameters, initially showing an increase to a maximum, followed by a decreasing trend. A high value of 74.5% of the theoretical density (TD) was obtained from suspensions that contained 70 wt% solids and 0.1 wt% dispersant. The substitution of the angular coarse particles by similarly sized but more spherical particles resulted in an additional increase in green density to >76 wt% TD. The results can be interpreted in terms of freedom of particles upon deposition on the cast layer, which enables particle rearrangement, and segregation phenomena.

show abstract

Section: (3) Characterization Of Slip-cast Bodies (A) Effect Of Diffesupporting

confidence: 92%