One step sintering of homogenized bauxite raw material and kinetic study

Gao, Chang-he; Jiang, Peng; Li, Yong; Sun, Jia; Zhang, Junjie; Yang, Huan-ying

doi:10.1007/s12613-016-1343-8

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…However, mullite densification is generally poor at 1450 ℃. Besides, the mullite phase exhibits a relatively lower density (2.01~2.45 g/cm 3 [44]) compared to cristobalite and aluminosilicate glass (2.32~2.38 and 2.62~2.67 g/cm 3 , respectively). Therefore, the more amount of mullite phase contains, the smaller the density is.…”

Section: Physical and Mechanical Propertiesmentioning

confidence: 98%

“…When ρAl is higher than 2.42 g/cm 3 , a negative volume change occurs, suggesting an increase of porosity value due to the shrinkage of volume. The average density of mullite and aluminosilicate glass (2.01~2.45 g/cm 3 sintered at 1400~1500 ℃[44] and 2.62~2.67 g/cm3 ) is right near the value of 2.42 g/cm3 . Therefore, no big difference in porosity was observed from sample S1 to S4.…”

mentioning

confidence: 88%

“…According to Fig. 6 3 sintered at 1500~1600 ℃ [44]). This would result in a larger volume shrinkage at around 5 vol% according to Fig.…”

Section: Pore Formation Modelsmentioning

confidence: 99%

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Effects of Composite Sintering Additives: Al(OH)3+Y2O3+CaF2 on the Performance of Porous Mullite Oxide-Bonded SiC Ceramics

Chang

Liu

et al. 2021

Preprint

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A composite sintering additive system: Al(OH)3+Y2O3+CaF2 was proposed for porous mullite oxide-bonded SiC ceramics. Small variations of sintering additives have significant influences on the phase composition, pore shape/size, density and flexural strength. Samples sintered at 1550 ℃ for 4 h in the air atmosphere realized both good mullite densification and no detectable cristobalite phase, which was difficult to be achieved at the same time. Besides, the composite sintering additive system also promoted the formation of columnar shape mullite, which acts as a reinforcement. Flexural strength as high as 108 MPa was achieved at an apparent porosity of 40.3 vol%, which is higher than that sintered by SPS technique. Moreover, those additives also act as pore formers determining the shape and size of pores. Around 8.9 µm strip-like, 11.8 µm continuous channel-like and 4.1 µm irregular pores were obtained for Al(OH)3, Al(OH)3-Y2O3 and Al(OH)3-Y2O3-CaF2 added samples, respectively. Corresponding phase evolution, sintering mechanisms and pore formation models were established. This work provides a simple way to modify the phase, pore size/shape, and strength of mullite oxide-bonded porous SiC ceramics by properly selecting sintering additives without any additional pore formers.

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Section: Physical and Mechanical Propertiesmentioning

confidence: 98%

mentioning

confidence: 88%

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Effects of Composite Sintering Additives: Al(OH)3+Y2O3+CaF2 on the Performance of Porous Mullite Oxide-Bonded SiC Ceramics

Chang

Liu

et al. 2021

Preprint

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“…One approach to improve CSP systems is to increase the maximum operation temperature. HTFs based on sintered bauxite particles are limited up to its sintering temperature, starting at 1100 °C [1] providing the possibility to increase process temperatures for CSP tower systems.…”

Section: Introductionmentioning

confidence: 99%

Numerical Assessment of Packing Structures for Gas-Particle Trickle Flow Heat Exchanger for Application in CSP Plants

Reichart

Puttkamer

Buck

et al. 2021

ASME 2021 15th International Conference on Energy Sustainability

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The centrifugal particle receiver (CentRec), a direct absorbing receiver operating with ceramic particles, demonstrated at the Julich solar power tower under solar conditions technical large-scale feasibility, generating particle outlet temperatures up to 965 °C. To push particle based CSP technology further towards commercial application the high particle temperatures have to be transferred to a working fluid, like air. A gas-particle trickle flow direct contact heat exchanger (TFHX) has been identified with great potential for high efficiency heat transfer. Inspired by chemical trickle flow reactors and previous work in literature focusing on the gas-particle TFHX concept for temperatures up to 500 °C, the approach and its applicability for high temperature heat exchanger shall be developed further in future. In preparation for subsequent research activities, the present work focuses on the preliminary selection of suitable packing structures for the TFHX. Packing assessment criteria are defined and used to assess the particle behavior within a variety of 44 different packing geometries. The analysis was performed using the open source DEM software LIGGHTS-PUBLIC whereas at this early stage of investigation gas presence was neglected. In the analysis process the packing structures are assessed with the previously defined assessment criteria and reduced to one type of a favorable geometry type. In conclusion, the advantageous characteristics of the identified geometry type are discussed. The presented study gives a methodical selection for packing structures and first starting point for further investigating in the field of the gas-particle TFHX whereas in subsequent work the influence of gas flow to the particle dynamic must be investigated by experimental and simulation work.

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A new synthetic route to MgO–MgAl2O4–ZrO2 highly dispersed composite material through formation of Mg5Al2.4Zr1.7O12 metastable phase: synthesis and physical properties

Jiang

Yin

Yan

et al. 2017

Int J Miner Metall Mater

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One step sintering of homogenized bauxite raw material and kinetic study

Cited by 5 publications

References 14 publications

Effects of Composite Sintering Additives: Al(OH)3+Y2O3+CaF2 on the Performance of Porous Mullite Oxide-Bonded SiC Ceramics

Effects of Composite Sintering Additives: Al(OH)3+Y2O3+CaF2 on the Performance of Porous Mullite Oxide-Bonded SiC Ceramics

Numerical Assessment of Packing Structures for Gas-Particle Trickle Flow Heat Exchanger for Application in CSP Plants

A new synthetic route to MgO–MgAl2O4–ZrO2 highly dispersed composite material through formation of Mg5Al2.4Zr1.7O12 metastable phase: synthesis and physical properties

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