The effect of MgO and Cr<sub>2</sub>O<sub>3</sub> on mullite formation from Nigeria sourced kaolin-calcined alumina sintered compacts

Aladesuyi, Olanrewaju A.; Oluseyi, Ajanaku Kolawole; Das, Swapan Kumar

doi:10.1088/1757-899x/509/1/012007

Cited by 5 publications

(3 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was observed in the XRD pattern given in Figure 4 and Figure 5 that as 5%MgO additive was introduced into the sintered sample, more mullite content was developed reaching 44.4% as compared to 29% formed at the control sample at sintering temperature of 1300°C. This was corroborated by the findings of Olanrewaju et al (2019) and Choo et al (2019), addition of chemical additive into the clay sample either accelerates or inhibits the growth of mullite phases in the sample but in the case of MgO additive, the formation of mullite was accelerated and both primary and secondary mullite was formed. As the sintering temperature was increased to 1400 °C, mullite content slightly reduced (31.9%) and this occurred due to increase in the phases of periclase, graphite and cristobalite phase in the sintered sample as presented in the XRD result shown in Figure 4.…”

Section: Effect Of Sintering Temperature On the Phase Development In ...supporting

confidence: 69%

“…In the study, addition of additives in ceramic composite has a significant influence on the mineralogical composition of the fired body. Olanrewaju et al (2019) conducted a study to examine the impact of MgO and Cr2O3 additives on mullite formation from locally sourced Nigerian kaolincalcined alumina sintered compacts. The researchers synthesized mullite by sintering the kaolin-alumina mixture obtained from Nigeria and the results indicated successful synthesis of mullite, as evidenced by the dominant presence of mullite phases in the XRD patterns at 1600°C.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of Mullite- Carbon Refractory Ceramic Composite From Locally Sourced Materials

Ibekwe,

Aramide

2023

Int. J. Eng. Tech. Mgmt. Res.

View full text Add to dashboard Cite

In the pursuit of developing a mullite- carbon refractory ceramic composite with optimum physical and mechanical properties modified with additives, experimental studies were carried out using local materials from Nigeria's south-south and south-west regions. Kaolin clay was crushed to 2 mm and ball-milled into powder. Ground kaolin was homogeneously blended with graphite using a ball mill and sieved through a 300μm electric sieve. The homogeneous mix was combined with predetermined Magnesium Oxide proportions, compacted, and fired at 1300 °C, 1400 °C, and 1500 °C. Extensive tests followed, including X-ray diffraction (XRD) for phase analysis, ultra-high- resolution field emission scanning electron microscopy equipped with energy-dispersive spectroscopy (SEM-EDS) for microstructural morphology, and assessments of mechanical and physical properties. Findings indicated that additive inclusion spurred mullite phase development between 1300°C and 1500°C, enhancing their physico- mechanical properties. Among the samples, Sample R composed of 15% MgO, 65% kaolin, and 20% graphite, fired at 1500°C, displayed optimal physico-mechanical properties (95.8%) and favorable mullite formation (46.0%) was achieved.

show abstract

Section: Effect Of Sintering Temperature On the Phase Development In ...supporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Development of Mullite- Carbon Refractory Ceramic Composite From Locally Sourced Materials

Ibekwe,

Aramide

2023

Int. J. Eng. Tech. Mgmt. Res.

View full text Add to dashboard Cite

show abstract

“…Peaks at 16.4°, 30.9°, 33.1°, 35.4°, and 40.8°corresponding to the diffraction of mullite phase (PDF 01-076-2578) are relatively weak intensity at 950°C but become profound at 1000°C and 1050°C. Previous works reported that mullite can be formed at >900°C [24][25][26] and have an important role in the development of mechanical strength in ceramics [29][30][31]. The XRD study revealed that the mullite phase was likely formed at temperatures ≥ 950°C.…”

Section: Resultsmentioning

confidence: 86%

Utilization of Rice Husk, an Abundant and Inexpensive Biomass in Porous Ceramic Membrane Preparation: A Crucial Role of Firing Temperature

Dung

Nam

Nhan

et al. 2021

Journal of Nanomaterials

View full text Add to dashboard Cite

The influence of firing temperature on characteristics and bacterial filtration of the porous ceramic membrane prepared from rice husk (20 wt%) and kaolin has been investigated. As firing temperatures increased from 900 to 1100°C, the compressive strength of membrane increased from 555.3 N/cm2 to 2992.3 N/cm2, whereas the porosity decreased from 49.4 to 30.2% due to structural condensation and mullite formation. The condensation caused pore contraction that finally improved bacterial removal efficiency from ~90% to 99%. The results suggested that the porous ceramic membrane prepared from rice husk and kaolin should be fired at ~1050°C to attain both strength and filtration efficiency.

show abstract

The Role of TiO2 on ZnAl2O4 Spinel Prepared by Direct Coagulation Casting Method: Physico-mechanical, Optical, Structural and Antimicrobial Properties

Sadek,

Reda,

Khattab

et al. 2023

J Inorg Organomet Polym

View full text Add to dashboard Cite

This work represents the shaping of alumina–zinc oxide (AZ) samples with the direct coagulation casting method. The effect of zinc oxide (0, 10, 20, 30, and 40 wt%) and the firing temperatures on the phase composition, microstructure, physical properties, and mechanical properties of the AZ samples were studied. The effect of titanium oxide (2, 5, and 7 wt%) and the firing temperatures on the phase composition, microstructure, physical properties, and mechanical properties of the AZ sample with 40 wt% of zinc oxide were studied. Furthermore, the optical properties, magnetic properties, and antimicrobial activity were measured. The results indicate that the increase in zinc oxide enhances the formation of zinc aluminate, which has a gahnite phase. Moreover, increasing the zinc oxide increases the apparent porosity and decreases the grain size and bulk density at various firing temperatures. On the other hand, the addition of 5 wt% titanium oxide increases the bulk density to 3.5 g/cm3 compared to 1.72 g/cm3 with no titania. The apparent porosity and compressive strength reached 5% and 69.2 MPa after 5 wt% TiO2 addition; respectively, compared to 59% and 27.2 MPa with no titania addition. The prepared samples show promising optical band gap of 2.98–3.97 eV, a mixed magnetic behavior, and favorable antibacterial activity against E. coli, S. aureus, B. cereus strains.

show abstract

The effect of MgO and Cr₂O₃ on mullite formation from Nigeria sourced kaolin-calcined alumina sintered compacts

Cited by 5 publications

References 19 publications

Development of Mullite- Carbon Refractory Ceramic Composite From Locally Sourced Materials

Development of Mullite- Carbon Refractory Ceramic Composite From Locally Sourced Materials

Utilization of Rice Husk, an Abundant and Inexpensive Biomass in Porous Ceramic Membrane Preparation: A Crucial Role of Firing Temperature

The Role of TiO2 on ZnAl2O4 Spinel Prepared by Direct Coagulation Casting Method: Physico-mechanical, Optical, Structural and Antimicrobial Properties

Contact Info

Product

Resources

About

The effect of MgO and Cr2O3 on mullite formation from Nigeria sourced kaolin-calcined alumina sintered compacts

Cited by 5 publications

References 19 publications

Development of Mullite- Carbon Refractory Ceramic Composite From Locally Sourced Materials

Development of Mullite- Carbon Refractory Ceramic Composite From Locally Sourced Materials

Utilization of Rice Husk, an Abundant and Inexpensive Biomass in Porous Ceramic Membrane Preparation: A Crucial Role of Firing Temperature

The Role of TiO2 on ZnAl2O4 Spinel Prepared by Direct Coagulation Casting Method: Physico-mechanical, Optical, Structural and Antimicrobial Properties

Contact Info

Product

Resources

About

The effect of MgO and Cr₂O₃ on mullite formation from Nigeria sourced kaolin-calcined alumina sintered compacts