Effects of milling and subsequent heat treatment on preparation of mullite–zirconia nanocomposites

Ghaffari, Somaye; Alizadeh, Mohammad; Asadian, Keivan; Ebadzadeh, Touradj; Ghanbari, Arezoo

doi:10.1049/mnl.2013.0008

Cited by 5 publications

(5 citation statements)

References 18 publications

(19 reference statements)

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“…Recently, the zircon milling effect on the zircon alumina reaction sintering to obtain mullite zirconia refractory composites was also proposed and studied. In all these examples, the merits of the strategy were established [39][40].…”

Section: Introductionmentioning

confidence: 99%

Dense zircon (ZrSiO4) ceramics by a simple milling-sintering route

Gauna¹,

Conconi²,

Suárez

et al. 2018

SCI SINTER

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In this work, a simple milling sintering route (pressure less) to process dense zircon ceramics from fine (D 50 0.8 µm) zircon powders is explored. Particularly, the milling time effect (0-120 min) and the maximum sintering temperature (1400-1600 °C) were studied. The sintering grade developed microstructure and Vickers hardness (Hv) were evaluated and correlated. The dissociation of silicate into (monoclinic and tetragonal) zirconia and silica was evaluated by X-ray diffraction followed by the Rietveld method; it was found to be below 10 wt% in all the studied ranges. The sintering was enhanced by the milling pretreatment. No sintering additives were incorporated. Dense zircon (porosity below 1 %) ceramics were obtained by a simple millingsintering route of this high refractory powder at 100-200 °C below the sintering temperature used with conventional processing routes to obtain equivalent final properties. The Vickers hardness reached: 9.0 GPa.

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Section: Introductionmentioning

confidence: 99%

Dense zircon (ZrSiO4) ceramics by a simple milling-sintering route

Gauna¹,

Conconi²,

Suárez

et al. 2018

SCI SINTER

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“…Therefore, the lower density of X and S composites can also be attributed to the higher amount of mullite. It has been reported that the densification of mullite is challenging and needs high temperatures 13 …”

Section: Resultsmentioning

confidence: 99%

“…It has been reported that the densification of mullite is challenging and needs high temperatures. 13 Investigation of the phase transformation of aluminum alkoxide shows that around 24.7% weight loss has occurred during heating from room temperature up to 1000°C. 33 Therefore, it can be concluded that use of aluminum alkoxide leads to diminished density and enhanced porosity.…”

Section: Physical and Mechanical Propertiesmentioning

confidence: 99%

“…8,10 However, mullite formation and complication of reaction sintering demand high temperatures and longer times. To achieve this, some approaches such as incorporation of additives, 6,8,10,11 use of mineral industrial raw materials, 12 mechanical milling, 1,5,13 and microwave sintering 5,14 have been studied to promote the reaction sintering process and reduce the sintering temperature as well as energy consumption.There are various studies on the processing techniques of AMZ composites. Semi-colloidal and wet processing routes…”

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confidence: 99%

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Development of AMZ composites via mutual attraction of particles in wet processing

Khorsand

Majidian

Farvizi

2020

Int J Applied Ceramic Tech

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In this paper, three approaches were investigated for preparing alumina‐mullite‐zirconia (AMZ) composites. The weight ratio of alumina to zircon was selected to be 85/15. In the first approach, common well‐known reaction sintering or solid‐state mixing of alumina and zircon were used. In the second approach, suspensions of the raw materials were prepared to examine the effect of wet processing method. The third approach was based on the use of aluminum alkoxide coated zircon and alumina. The sintering of samples was carried out at the temperature of 1630°C for 3 hours. Phase composition and Rietveld refinement method, microstructural observation, EDS analysis, as well as physical and mechanical properties were used and determined to characterize the sintered samples. The results showed that aluminum alkoxide coating can develop the mentioned reaction sintering and mullite formation. However, the desired mechanical properties were not obtained. Wet processing approach resulted in more interesting data about the formation of mullite and could improve the microstructure homogeneity of final composites. Higher amount of tetragonal zirconia, good densification, high hardness, and fine microstructure were obtained by the wet approach. These interesting results were attributed to the fine discrete particles provided by mutual attraction in the wet preparation method.

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“…The milling effect on the zircon alumina reaction sintering for obtaining mullite zirconia refractory composites was also studied [16,17].…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO2 in fine zircon sintering and properties

et al. 2021

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The effect of the TiO2 addition in the ceramic processing of dense zircon materials from zircon fine powders was established. The addition of TiO2 (5-10 wt%) permitted to obtain dense ceramics at lower temperatures (100-150 oC below), with comparable mechanical behavior. The thermochemical processes were described after a multi-technique experimental approach, which included a sintering analysis, powder X-Ray diffraction analysis (XRD), scanning electronic microscopy (SEM) and Vickers hardness of the polished dense obtained ceramics. After 1400 oC heating programs, the added TiO2 acts as a sintering aid with no important chemical reactions, and presented improved mechanical behavior in comparison with pure zircon ceramics. On the other side, in samples fired at 1500 oC, TiO2 partially (?50 %) reacts with zircon, forming ZrTiO4, while the formed SiO2 goes to the grain boundaries. Samples with 5 wt% TiO2 present better mechanical behavior than the ones with 10 wt%. The performed mechanical characterization indicates the merits of the material processed by this inexpensive processing route. Developed density, hardness (?10 GPa) and fracture toughness (?2 MPa.m-1/2) are comparable with the best figures reported.

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Effects of milling and subsequent heat treatment on preparation of mullite–zirconia nanocomposites

Cited by 5 publications

References 18 publications

Dense zircon (ZrSiO4) ceramics by a simple milling-sintering route

Dense zircon (ZrSiO4) ceramics by a simple milling-sintering route

Development of AMZ composites via mutual attraction of particles in wet processing

Effect of TiO2 in fine zircon sintering and properties

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