Mullite Whiskers Derived from an Oxide Mixture Activated by a Mechanochemical Process

Kong, Ling Bing; Ma, Jan; Huang, Haitao

doi:10.1002/1527-2648(20020717)4:7<490::aid-adem490>3.0.co;2-c

Cited by 19 publications

(6 citation statements)

References 18 publications

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“…The energy applied to the powder, reduces the grain/particle sizes in the first place. Besides, in some cases, chemical reactions may also take place during milling and in some others, the reaction temperature may even be lowered, depending on the amount of energy stored in the particles [18,19]. Figures 3 and 4 show the XRD patterns of TAP and non-TAP melted powder.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Synthesis of Mullite by Means of Transferred and Nontransferred Arc Plasma Melting

Yugeswaran

Suresh

Selvarajan

et al. 2010

Materials and Manufacturing Processes

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Arc plasma melting technique is a simple method for the synthesis of high melting point materials. In this article, mullite was synthesized by transferred arc plasma (TAP) and nontransferred arc plasma (non-TAP) melting processes, and the results were compared. The mixes of alumina and silica powders (3:2 mole ratios) were ball milled for four hours and then melted in an arc plasma torch, used in transferred and nontransferred mode, at 5 kW input power and two minutes of processing time. Argon gas was used as a plasma-forming gas. The crystalline phases and the microstructural features of the melted samples were determined by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. A complete crystallization of mullite, with dense, thick whiskers-shaped crystals, was achieved in TAP processing of the alumina/silica system. On the other hand, the non-TAP process produced porous mullite along with a small amount of residual alumina phase. Differential thermal analysis (DTA) curves of the synthesized mullite samples allowed a deeper understanding of the mechanisms of mullite formation during the two different processes.

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Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Synthesis of Mullite by Means of Transferred and Nontransferred Arc Plasma Melting

Yugeswaran

Suresh

Selvarajan

et al. 2010

Materials and Manufacturing Processes

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“…[6][7][8] Microsized mullite whiskers, as a good reinforcement material in ceramic-matrix composite, have been fabricated and extensively investigated. [9][10][11][12][13][14][15] Recent studies have shown that nanoscale whiskers such as nanowires or nanorods have better mechanical properties than their microscale counterparts. [16][17][18] Thus, mullite nanowires or nanorods are good composite reinforcements that could find important applications in functional ceramics due to their high * Authors to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Large-Scale Synthesis of Mullite Nanowires by Molten Salt Method

Huo

Zhu²,

Fu³

et al. 2010

J. Nanosci. Nanotech.

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Single-crystalline mullite (3Al2O3 2SiO2) nanowires have been produced in large quantities by a low cost and environmentally benign molten salt synthesis (MSS) method. The raw materials, Al2(SO4)3 and SiO2 powders, react in molten Na2SO4 at 1000 degrees C to produce mullite nanowires without the use of surfactants or templates. After the synthesis, the remaining salts can be easily separated from the products by washing with water. The final products are characterized by X-ray powder diffraction, field emission scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, selected-area electron diffraction, and inductively coupled plasma-atomic emission spectrometry. The thermal and chemical behavior of the raw materials is investigated by heating at a rate of 10 degrees C/min up to 1200 degrees C in air followed by thermogravimetric and differential scanning calorimetry analyses. The single-crystalline mullite nanowires have diameters of 30-80 nm and lengths from several hundreds of nanometers to micrometers and the growth mechanism is discussed.

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“…For example, a mixture of solids, a mixture of sols, or a mixture of sol and salts can each be used as the starting materials. Similarly, a variety of mullite preparation methods has been developed such as reaction sintering of mechanically mixed powders [7][8][9][10][11], hydrothermal treatment of mixtures of sols [12][13][14] and chemical vapour deposition [15][16][17][18]. On the other hand, different routes have been used for manufacturing of zirconia-mullite composites from mullite-zirconia or alumina-zircon mixture such as plasma spray using plasma arc [19][20][21], reaction sintering at elevated temperatures [22][23][24][25][26], crystallization of rapidly quenched melts of ZrO 2 -Al 2 O 3 -SiO 2 [27] and liquid infiltration technique [28].…”

Section: Introductionmentioning

confidence: 99%