Effect of Solids Loading and Dispersant Concentration on Strain Mismatch and Deformation of Slip-Cast Green Bodies

2004 ◽  
Vol 84 (10) ◽  
pp. 2274-2280 ◽  
Author(s):  
John D. Yates ◽  
Stephen J. Lombardo
Keyword(s):  
Solids Loading ◽  
Slip Cast ◽  
Strain Mismatch

Effect of Binder Content on the Slip Rheology and Green Properties of Slip Cast Alumina

2019 ◽  
Vol 798 ◽  
pp. 177-181
Author(s):  
Kritkaew Somton ◽  
Pitak Laoratanakul ◽  
Ryan McCuiston
Keyword(s):  
Flexural Strength ◽  
Physical And Mechanical Properties ◽  
Casting Process ◽  
Binder Content ◽  
Green Density ◽  
Optimal Amount ◽  
Solids Loading ◽  
Maximum Value ◽  
Slip Cast ◽  
Scanning Electron

The rheology of A96% alumina slips and the physical and mechanical properties of slip cast samples were studied. The slips had a constant solids loading of 40 wt% alumina and a polyvinyl alcohol (PVA) content of 0-3 wt%, as a binder. The rheological behavior and viscosity of the slips were examined to determine the flowability of the slips necessary for the casting process. The slips were prepared by ball milling and the bend bar samples were cast in plaster molds. The green densities and the flexural strength of the bars were measured, and the fracture surfaces were examined by scanning electron microscopy. It was found that the slip viscosity increased with an increase of PVA content. The green flexural strength also increased to a maximum value of 0.52 MPa with increasing PVA up to 2 wt%. The further addition of PVA decreased the flexural strength. The green density did not significantly change with the PVA content, however the samples produced using 3 wt% PVA showed the lowest percentage of theoretical density of 41%. The fracture surface of the 3 wt% PVA sample showed numerous large pores compared with the other samples. Therefore, in this study it was concluded that there is in optimal amount of PVA to produce the highest green density and flexural strength of cast samples. Excess PVA reduced the flowability of the slip and resulted in excess porosity, which decreased the green density and deteriorated the flexural strength.

Colloidal processing of chemically prepared zinc oxide varistors. Part II: Near-net-shape forming and fired electrical properties

2004 ◽  
Vol 19 (5) ◽  
pp. 1341-1347 ◽  
Author(s):  
Nelson S. Bell ◽  
James A. Voigt ◽  
Bruce A. Tuttle ◽  
Duane B. Dimos
Keyword(s):  
Zinc Oxide ◽  
Slip Casting ◽  
Oxide Powders ◽  
Solids Loading ◽  
Density Values ◽  
Slip Cast ◽  
Near Net Shape ◽  
Net Shape Forming ◽  
Powder Compacts ◽  
Cast Parts

Chemically prepared zinc oxide powders were processed for the production of high aspect ratio varistor components (length/diameter >5). Near-net-shape casting methods including slip casting and agarose gelcasting were evaluated for effectiveness in achieving a uniform green microstructure that densifies to near theoretical values during sintering. The structure of the green parts was examined by mercury porisimetry. Agarose gelcasting produced green parts having low solids loading values and did not achieve high fired density. Isopressing the agarose cast parts after drying raised the fired density to greater than 95%, but the parts exhibited catastrophic shorting during electrical testing. Slip casting produced high green density parts, which exhibit high fired density values. The electrical characteristics of slip-cast parts are comparable with dry-pressed powder compacts.

Rheological Analysis of Ceramics Suspensions with High Solids Loading

2012 ◽  
Vol 727-728 ◽  
pp. 646-651 ◽  
Author(s):  
Luiz Fernando Grespan Setz ◽  
Laís Koshimizu ◽  
Sonia Regina Homem de Mello-Castanho ◽  
Márcio Raymundo Morelli
Keyword(s):  
Rheological Behaviour ◽  
Rheological Parameters ◽  
High Solids ◽  
Rheological Analysis ◽  
Solids Loading ◽  
High Solids Loading ◽  
Shaping Process ◽  
Slip Cast ◽  
And Control ◽  
Alumina Suspensions

The pure oxides (yttria, zirconia, titania, alumina, etc.) pastes ceramics production by concentrate suspensions is interesting because differently than plastic ceramics (clays), where these behaviours are often empirical available, the rheological suspensions behaviour are extensively studied. Thus, controlling the concentrate slips rheological parameters, is possible extend these analysis for better understand and control the plastic pastes production, providing subsidies to obtain after shaping process, such as extrusion and calendering, suitable products for the desired application. Thus, alumina suspensions rheological behaviour, with high solids loading (> 50 vol.%) adequately stabilized, slip cast shaped are available in this work. High solids loading suspensions, up to 60 vol.%, presents adequate flow for thickeners/plasticizers elements adds to produce ceramic plastic pastes.

scholarly journals Monitoring and characterising the solids loading dynamics to drainage systems via gully pots

2021 ◽  
pp. 1-12
Author(s):  
Matthijs Rietveld ◽  
Francois Clemens ◽  
Jeroen Langeveld
Keyword(s):  
Drainage Systems ◽  
Solids Loading

scholarly journals Optimization of Lignin Extraction Variables by Response Surface Methodology from Pine Saw Dust, and Quantification of Major Structural Units in Isolated Lignin Fraction

2021 ◽  
Vol 11 (4) ◽  
pp. 1739
Author(s):  
Muhammad Ajaz Ahmed ◽  
Jae Hoon Lee ◽  
Joon Weon Choi
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Quantum Coherence ◽  
Resonance Spectrum ◽  
Quadratic Model ◽  
Molecular Weights ◽  
Solids Loading ◽  
A Value ◽  
Lignin Extraction ◽  
Lignin Fraction

A synergistic combination of dioxane, acetic acid, and HCl was investigated for lignin extraction from pine wood biomass. After initial screening of reagent combination, response surface methodology (RSM) was used to optimize the lignin yield with respect to the variables of time 24–72 h, solids loading 5–15%, and catalyst dose 5–15 mL. A quadratic model predicted 8.33% of the lignin yield, and it was further confirmed experimentally and through the analysis of variance (ANOVA). Lignin at optimum combination exhibited features in terms of derivatization followed by reductive cleavage (DFRC) with a value of (305 µmol/gm), average molecular weights of 4358 and polydispersity of 1.65, and 2D heteronuclear single quantum coherence nuclear magnetic resonance spectrum (2D-HSQC NMR) analysis showing relative β-O-4 linkages (37.80%). From here it can be suggested that this fractionation can be one option for high quality lignin extraction from lignocellulosic biomass.

Microstructure, phase compositions and mechanical properties of slip cast sintered SiC/Si3N4 composites

2021 ◽  
Author(s):  
Shohreh Shahrestani ◽  
Mokhtar Che Ismail ◽  
Saeid Kakooei ◽  
Mohammadali Beheshti
Keyword(s):  
Mechanical Properties ◽  
Slip Cast
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