Synthesis of sillimanite whiskers

Xu, Linfeng; Xi, Xiuan; Shui, Anze

doi:10.1016/j.ceramint.2015.04.070

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…Similar gas phase reaction for formation of sillimanite whisker could happen at low temperature [23]. However, to the best of our knowledge, few works have been reported associating to the Equ.…”

Section: Resultsmentioning

confidence: 97%

Investigation on the influence factors for preparing mullite-whisker-structured porous ceramic

Zhu

et al. 2015

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 97%

Investigation on the influence factors for preparing mullite-whisker-structured porous ceramic

Zhu

et al. 2015

Journal of Alloys and Compounds

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“…Sillimanite is a simple chain silicate mineral among the infinite structure silicate minerals. The [SiO 4 ] tetrahedron in the chain silicate mineral skeleton is linked by shared oxygen atoms and extends infinitely in a one-dimensional direction [1,2] Sillimanite (Al 2 SiO 5 ) has a double-stranded structure (Figure 1), in which [ SiO 4 ] and [AlO 4 ] alternate arrangement in the chain, sharing a cation. In the other chain, there are only [AlO 6 ] octahedrons, and [AlO 6 ] shares two cations with each other, and connects with the same edge.…”

Section: Introductionmentioning

confidence: 99%

The Dissolution Mechanism of Low-Molecular-Weight Organic Acids on the Sillimanite

Zhang,

Yu,

Zhong

et al. 2023

Materials

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The interaction between low-molecular-weight organic acids (LMWOAs) and minerals in nature has been widely studied; however, limited research has been conducted on the dissolution mechanism of sillimanite in the presence of different organic acids. In this study, the interaction between the sillimanite sample and LMWOAs (citric acid, oxalic acid, and citric/oxalic mixture) at the same pH was investigated. The dissolution rate of Si and Al was high during the initial reaction time, then slowed down in the presence of LMWOAs. The dissolution data for Si and Al from sillimanite in the LMWOAs fit well with the first-order equation (Ct = a(1 − exp(−kt))) (R2 > 0.991). The dissolution process of sillimanite in the organic acids was controlled by the surface chemical reaction step. The dissolution concentration of Si in aqueous citric acid was higher than that in oxalic acid. In contrast, the dissolution concentration of Al in oxalic acid was more than that in citric acid. The maximum concentrations of Si and Al in the presence of composite organic acids were 1754 μmol/L and 3904 μmol/L. The sillimanite before and after treatment with LMWOAs were studied using X-ray diffraction (XRD) and scan electron microscopy (SEM). These results are explained by the characterization of the sillimanite. Under the single acid solution, the (210) crystal plane with a high areal density of Al in sillimanite was easily dissolved by the oxalic acid, while the (120) in sillimanite with a high areal density of Si was more easily dissolved by citric acid. In the composite organic acids, the Si-O bond and Al-O bond in sillimanite were attacked alternately, leading to the formation of some deeper corrosion pits on the surface of sillimanite. The results are of interest in the dissolution mechanisms of sillimanite in the low-molecular-weight organic acids and the environmentally friendly activation of sillimanite.

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“…So far, although a large number of ceramic whiskers such as SiC [3], TiC [4], Si 3 N 4 [5] and TiB [6] have been reported in recent years by various synthesis methods, there are very few types of whiskers commercially available on a large scale, except SiC whiskers. But SiC has some limitations for use at high temperature because of its chemical stability [4].…”

Section: Introductionmentioning

confidence: 99%

First synthesis of Cr3C2 nanowhiskers by low-temperature vaccum carburization from precursor

Jin

Zhang

et al. 2016

Materials Chemistry and Physics

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Synthesis of sillimanite whiskers

Cited by 4 publications

References 21 publications

Investigation on the influence factors for preparing mullite-whisker-structured porous ceramic

Investigation on the influence factors for preparing mullite-whisker-structured porous ceramic

The Dissolution Mechanism of Low-Molecular-Weight Organic Acids on the Sillimanite

First synthesis of Cr3C2 nanowhiskers by low-temperature vaccum carburization from precursor

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