Thermally enhanced slip casting of alumina ceramics

Murfin, A.M.; Binner, Jon

doi:10.1016/s0272-8842(97)00062-x

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…Many materials have been developed to avoid thermomechanical stress at the interface between catalyst layer and support. The catalysts (TiO 2 ) are deposited in surface layers by means of different techniques such as chemical vapour deposition [30], slip cast [31], ceramics [32], dry processing [18], coating methods and thermal chemical reactions [33] and inorganic fibres [19].…”

Section: Introductionmentioning

confidence: 99%

Study of Influence Factors in the Evaluation of the Performance of a Photocatalytic Fibre Reactor (TiO2/SiO2) for the Removal of Organic Pollutants from Water

et al. 2022

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The performance of a photocatalytic fibre reactor (UBE Chemical Europe), made of cartridges of fine particles of TiO2 dispersed within silicon fibres and irradiated by ultraviolet light, for the removal of organic pollutants from synthetic waters was evaluated. In the sensitivity analysis carried out, the factors catalytic surface area, fibre state, temperature and initial substrate concentration were studied using 4-chlorophenol as a test compound. The percentage of titanium in the fibre remained practically invariable after a series of experiments and cleaning procedures. Furthermore, the kinetics of removal of pyrene, phenol, 4-chlorophenol and bisphenol A (BPA) from water were evaluated by means of HPLC, UV-absorption and fluorescence techniques. Kinetic operational parameters were determined from a mathematical model proposed by Langmuir–Hinshelwood. Results show that catalytic surface, initial substrate concentration and temperature directly affect the degradation rate of organic compounds, whereas fibre state does not have a significant effect on that. It is proposed that removal of organic compounds from water mainly depends on the adsorption of the specific pollutant on the photocatalytic fibre and on the physical diffusion of the substrate towards the photocatalytic TiO2 active sites on the fibre, with the heterogeneous phase reaction prevailing over the homogeneous phase reaction.

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Section: Introductionmentioning

confidence: 99%

Study of Influence Factors in the Evaluation of the Performance of a Photocatalytic Fibre Reactor (TiO2/SiO2) for the Removal of Organic Pollutants from Water

et al. 2022

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“…Slip casting is a ceramic processing technique that can produce large, complex shapes with high green densities, while using inexpensive plaster mold materials for production [1]. The rheological characteristics of the ceramic slip, as well as the porosity characteristics of the plaster mold, are primary factors that affect the properties of the sintered ceramic products [2].…”

Section: Introductionmentioning

confidence: 99%

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

Somton

Laoratanakul

McCuiston

2019

KEM

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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.

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“…Slurry casting is a process used to consolidate ceramic powders into complex shapes with high green densities. It is also used mainly for the production of large components or for those having thin walls where the costs involved preclude the use of other techniques such as die pressing or isostatic pressing [4]. Slurry casting offers many possibilities and even some advantages over some other methods.…”

Section: Introductionmentioning

confidence: 99%

The Factors Affecting Colloidal Processing of 8YSCZ Ceramics

Tekeli

Gürü

2007

KEM

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To achieve improvements in the mechanical properties, fine grain size, homogeneous microstructure and high density are desirable. The poor dispersion of the powders produce difficulties in the densification and the presence of agglomerates is responsible for poor mechanical properties. Slurry casting is an important colloidal processing method for the ceramic industry and helps to prevent the agglomeration of fine particles. In the present study, the effect of processing parameters, namely solid content, dispersing agent concentration, slurry viscosity and milling time on slurry casting of 8YSCZ ceramics were investigated and optimum values were determined. The results showed that ceramic powder used was castable under limited conditions. The effect of shaping processon sintering behaviour and microstructure was also investigated for slurry-cast and die-pressed specimens. The results showed that specimen processed by slurry-casting had a faster sintering rate and lower sintering temperatures, compared to die-pressed specimen. The reason for better sintering was due to the homogeneous dispersion of the powder and elimination of agglomerates in slurry-cast specimen.

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Thermally enhanced slip casting of alumina ceramics

Cited by 6 publications

References 6 publications

Study of Influence Factors in the Evaluation of the Performance of a Photocatalytic Fibre Reactor (TiO2/SiO2) for the Removal of Organic Pollutants from Water

Study of Influence Factors in the Evaluation of the Performance of a Photocatalytic Fibre Reactor (TiO2/SiO2) for the Removal of Organic Pollutants from Water

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

The Factors Affecting Colloidal Processing of 8YSCZ Ceramics

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