Preparation of mullite whiskers from topaz decomposition

Peng, Ping; Sorrell, Charles C.

doi:10.1016/j.matlet.2003.09.046

Cited by 54 publications

(20 citation statements)

References 13 publications

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“…255, p. [23][24][25][26][27][28][29]2003. 22 [4] MERGLER, Y.J. ; HUIS IN 'T VELD, A.J.. Micro-abrasive wear of semi-crystalline polymers.…”

Section: Conclusõesmentioning

confidence: 99%

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Transição entre os modos de desgaste micro-abrasivo – riscamento e rolamento – Em WC-Co P20 e aço-ferramenta M2

Cozza¹

2019

Engenharia No Século XXI – Volume 9

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“…255, p. [23][24][25][26][27][28][29]2003. 22 [4] MERGLER, Y.J. ; HUIS IN 'T VELD, A.J.. Micro-abrasive wear of semi-crystalline polymers.…”

Section: Conclusõesmentioning

confidence: 99%

“…A perda de massa do topázio foi em função da saída do Si, F e OH. O SiF4, também, pode estimular a transformação do topázio em mulita de acordo com as Equações(2)e (3)[22]. Com a adição de óxidos de terras raras, uma fase vítrea é formada e outro processo de formação de whiskers começa atuar, juntamente com o processo de reações por transporte de gás.…”

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Transição entre os modos de desgaste micro-abrasivo – riscamento e rolamento – Em WC-Co P20 e aço-ferramenta M2

Cozza¹

2019

Engenharia No Século XXI – Volume 9

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“…The excellent mechanical properties make it a suitable material for application in where hightemperature mechanical and corrosion resistance properties are needed. 1)3) Because of crystalline perfection, good refractoriness, high creep resistance, and excellent thermal stability, 4) mullite whiskers are attractive candidate for reinforcement of ceramic composites to enhance the mechanical and thermal properties as a second phase. 1) The fracture toughness and flexural strength of mullitewhisker-reinforced composites in the current study was found to be higher than those without whiskers, which would reduce the fatal crack of matrix composites due to the inherent brittleness.…”

Section: Introductionmentioning

confidence: 99%

The formation mechanism of mullite whisker in the mullite fiber network

Xie

Yang

et al. 2018

J. Ceram. Soc. Japan

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The influences of different fibers and F ions on the formation mechanism of hierarchical structure were investigated. This study was undertaken to better understand how fibers affect the growth of mullite whisker and how the fluoride influences the transition of new phases. In this work, three networks with different fibers and the same active powder were prepared to investigate the effect of fibers on the mullite nucleation. The scanning electron microscope, X-ray diffraction and thermal gravity analysis and differential scanning calorimetry were employed to investigate the morphology, phase and weight changes during the fabrication process. The results showed that mullite fibers did not only decrease the reaction temperature but also promote mullite whiskers to grow on the fiber surface preferentially. Moreover, it was also certified that topaz was not the necessary intermediate to form mullite whisker. The investigation of AlF 3 illustrated it departed at about 600°C largely lower than the evaporation temperature of AlF 3 to react with Al and Si.

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“…For example, Okada and Otuska have synthesized mullite whiskers by vapor‐solid reaction using the tetraethoxysilane and aluminum nitrate 9‐hydrate as raw materials. Peng and Sorrell have obtained mullite whiskers from decomposition of the natural topaz. Wang et al has prepared mullite whiskers with nanometer‐sized (100‐300 nm) diameters and micrometer‐sized (10‐20 μm) lengths by chemical reactions between the SiC ceramics substrate and molten salts (Al 2 (SO 4 ) 3 +Na 2 SO 4 ).…”

Section: Introductionmentioning

confidence: 99%

Preparation of mullite whiskers from kaolin via the addition of tribasic calcium phosphate

Zhang

et al. 2017

Int J Applied Ceramic Tech

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Mullite whiskers are potential candidates for improving the mechanical and thermal properties of ceramic, glass, and composite material. In this work, well‐developed whisker‐shaped mullite has been produced by adding tribasic calcium phosphate (Ca3(PO4)2) into kaolin before calcining in air. In the raw kaolin, rod‐like mullite crystal of ~0.5‐1.0 μm length and ~0.05‐0.2 μm diameter formed at 1350°C, and mullite whiskers were not be observed; however, by doping 6 wt% Ca3(PO4)2 into kaolin, mullite whiskers of ~5.5 μm length and ~0.05‐0.10 μm diameter grew at 1250°C. The formation of high aspect ratio of mullite whiskers can probably be explained by the synergistic effect of P2O5 and CaO, resulting in the formation of liquid phase with a relatively higher content of Si and a lower viscosity at low temperature of 1250°C, which facilitates the growth of mullite displaying acicular morphology. The results are of interest in producing high aspect ratio of mullite whiskers from kaolin at reduced calcination temperatures.

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Preparation of mullite whiskers from topaz decomposition

Cited by 54 publications

References 13 publications

Transição entre os modos de desgaste micro-abrasivo – riscamento e rolamento – Em WC-Co P20 e aço-ferramenta M2

Transição entre os modos de desgaste micro-abrasivo – riscamento e rolamento – Em WC-Co P20 e aço-ferramenta M2

The formation mechanism of mullite whisker in the mullite fiber network

Preparation of mullite whiskers from kaolin via the addition of tribasic calcium phosphate

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