Modification of alumina bubbles with ammonium aluminum sulphate

Wang, Jiabang; Wang, Lianbang; Ye, Hui; Fu, Xin; Kong, Deyu

doi:10.1016/j.ceramint.2005.06.013

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…13 Spray drying method produces hollow spheres in large-scale production with millimeter-scale diameter, while the other two methods usually produce micrometer sized (or even smaller) hollow spheres in lab scale production. Alumina hollow spheres have been produced by atomization of melted alumina powder with compressed air, 14 which needs surface modification of the alumina particles, 15 or alumina-bearing binders. 16 In addition, the diameter of the obtained alumina HSs is usually millimeter scale.…”

Section: Resultsmentioning

confidence: 99%

A Novel Way to Prepare Hollow Sphere Ceramics

et al. 2014

J. Am. Ceram. Soc.

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Recent developments in the fabrication of hollow spheres have allowed our group to prepare a new type of macroporous ceramics: hollow sphere ceramics (HSCs). Alumina hollow spheres were first produced by centrifugal spray‐drying of particle‐stabilized foam slurry. The obtained hollow spheres were sintered together to form HSC at high temperatures. The effect of the sintering temperature on the linear shrinkage, porosity and compressive strength of HSC samples was investigated. When the sintering temperature was increased from 1400°C to 1600°C, the samples shrunk increasingly and the porosity decreased from 59% to 42%, which lead to an increase in the strength of the alumina foams from 6.9 (at 1400°C) to 100.0 MPa (at 1550°C). The mechanical strength of the HSC highly depends on the contact area between the hollow spheres, which could be increased by increasing the sintering temperature, decreasing the size of hollow spheres or by slurry infiltration.

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Section: Resultsmentioning

confidence: 99%

A Novel Way to Prepare Hollow Sphere Ceramics

et al. 2014

J. Am. Ceram. Soc.

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“…In recent years, it has been demonstrated that the suitable selection of aggregates can reduce crack propagation and refractories damage. The concept of refractory aggregates engineering was proposed, in which the design, fabrication, and use of aggregates with specific characteristics were discussed 16‐18 . Alumina bubbles, as one kind of spherical aggregates, were increasingly employed to enhance thermal shock resistance due to the hollow structure and low thermal capacity.…”

Section: Introductionmentioning

confidence: 99%

Effect of alumina bubbles with and without Al₂O₃ coatings on the performance of lightweight Al₂O₃‐MgAl₂O₄ refractories

Xin

Yin

Tang

et al. 2020

Int J Applied Ceramic Tech

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In this work, the effect of alumina bubbles with Al 2 O 3 coatings (CABs) and without coatings (ABs) on the performance of lightweight refractories was investigated. It showed that the addition of either ABs or CABs was beneficial to improve mechanical properties of refractories. The compressive strength for the specimens with 1 wt% ABs and CABs addition increased from ~50.5 to ~60.9 and ~70.2 MPa. The refractoriness under load was enhanced from ~1589 to ~1617 and ~1623°C. Furthermore, the results of three-point bending tests showed significant improvement was achieved in thermal shock resistance in terms of the value of residual strength ratio from 16% to 43% for specimens with CABs addition. Meanwhile, the results of ultrasonic pulse velocity measurement indicated that there is a good consistency between two evaluation methods. In order to achieve the trade-off between lightweight and overall performance, the introduction of CABs into lightweight refractories is feasible and effective.

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“…The typical quality problem is the poor antispalling property, 9 due to high melting temperature of alumina, strong ionic bond, low diffusion coefficient, low sintering temperature, and improper formulation. To lower the sintering temperature of the light weight bubble alumina ceramics and to improve the consistency of the strength and quality, great efforts have been made and huge research work have been done, 10–12 for example, optimizing binders and surface modification of bubble alumina, etc. In these papers, mechanical properties of the bubbles themselves, filling effect, and formulation of binders, manufacture process and microstructure were studied in detail.…”

Section: Introductionmentioning

confidence: 99%

Effect of Composite Binder on the Property of Lightweight Bubble Alumina Ceramics

Wang

Tian

Chen

2011

Int J Applied Ceramic Tech

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The effect of composite binder on the mechanical property of lightweight bubble alumina ceramics was studied. The ceramics were prepared using bubble alumina and α‐Al2O3 fines as raw materials, phosphoric acid (H3PO4) and aluminum ammonium sulfate (NH4Al(SO4)2·12H2O) as binders. During sintering, most phosphoric acid react with aluminum ammonium sulfate and the rest react with bubble alumina and α‐Al2O3 fines, forming aluminum phosphate on the surface of the alumina particles, which effectively improves the sintering process. The mechanical property of the ceramic bonded by composite binder was greatly improved compared with that bonded by single binder

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Modification of alumina bubbles with ammonium aluminum sulphate

Cited by 7 publications

References 4 publications

A Novel Way to Prepare Hollow Sphere Ceramics

A Novel Way to Prepare Hollow Sphere Ceramics

Effect of alumina bubbles with and without Al₂O₃ coatings on the performance of lightweight Al₂O₃‐MgAl₂O₄ refractories

Effect of Composite Binder on the Property of Lightweight Bubble Alumina Ceramics

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Modification of alumina bubbles with ammonium aluminum sulphate

Cited by 7 publications

References 4 publications

A Novel Way to Prepare Hollow Sphere Ceramics

A Novel Way to Prepare Hollow Sphere Ceramics

Effect of alumina bubbles with and without Al2O3 coatings on the performance of lightweight Al2O3‐MgAl2O4 refractories

Effect of Composite Binder on the Property of Lightweight Bubble Alumina Ceramics

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Effect of alumina bubbles with and without Al₂O₃ coatings on the performance of lightweight Al₂O₃‐MgAl₂O₄ refractories