Low Temperature Preparation of Mullite Whisker via Non-Hydrolytic Sol-Gel Process Combined with Molten Salt Method

Mullite whisker was prepared at low temperature via non-hydrolytic sol-gel (NHSG) process combined with molten salt method. The influence of heat treatment temperature was studied on the morphology and the microstructure of whisker, and its growth mechanism was also described. The results show that the mullite whisker appears at the lowest temperature of 750 °C, and optimized mullite whisker can be prepared at 850 °C with the growth direction of [00, whose diameter is in the range of 170~300 nm with the aspect ratio of >30.

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Effect of Heat Treatment on the Preparation of Zircon Whiskers

Materials Science Forum ◽

10.4028/www.scientific.net/msf.848.289 ◽

2016 ◽

Vol 848 ◽

pp. 289-294

Author(s):

Tao Zhang ◽

Wei Hui Jiang ◽

Jian Min Liu ◽

Guo Feng ◽

Quan Zhang ◽

...

Keyword(s):

Heat Treatment ◽

Molten Salt ◽

Sol Gel ◽

Sodium Molybdate ◽

Heat Treating ◽

Molten Salt Method ◽

Zirconium Tetrachloride ◽

Treatment Mode ◽

Heat Treatment Mode ◽

Sol Gel Process

Zircon whiskers were synthesized via non-hydrolytic sol-gel process combined with molten salt method by using anhydrous zirconium tetrachloride as zirconium source, TEOS as silicon source, anhydrous ethanol as solvent, and sodium molybdate as molten salt. The effects of heat treatment mode and cooling rate on the synthesis of zircon whiskers have been studied by means of XRD, FE-SEM, TG and TEM. The results indicate that well-developed whiskers can be prepared through heat treating the sample at 850°C for 3 h followed by a furnace cooling process. The zircon whiskers which were fabricated by this heat treatment mode grew along the [001] direction and showed diameter of 50~100 nm and aspect ratio of 20~30.

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Low-Temperature Preparation of Ba5Nb4O15Ceramics Through a Sol?Gel Process

Journal of the American Ceramic Society ◽

10.1111/j.1551-2916.2007.01729.x ◽

2007 ◽

Vol 90 (7) ◽

pp. 2287-2290 ◽

Cited By ~ 22

Author(s):

Yu-Jen Hsiao ◽

Yen-Hwei Chang ◽

Yee-Shin Chang ◽

Te-Hua Fang

Keyword(s):

Low Temperature ◽

Sol Gel ◽

Low Temperature Preparation ◽

Sol Gel Process ◽

Temperature Preparation

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Low Temperature Synthesis of Mullite Whisker by Nonhydrolytic Sol-Gel Process Combined with Molten Salt Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.538-541.2346 ◽

2012 ◽

Vol 538-541 ◽

pp. 2346-2349 ◽

Cited By ~ 2

Author(s):

Wei Hui Jiang ◽

Qian Wu ◽

Jian Min Liu ◽

Qing Xia Zhu ◽

Li Feng Miao

Keyword(s):

Low Temperature ◽

Molten Salt ◽

Sol Gel ◽

Crystal Phase ◽

Molten Salt Method ◽

Anhydrous Aluminum Chloride ◽

Low Temperature Synthesis ◽

Mixed Powder ◽

Oxygen Donor ◽

Sol Gel Process

Using tetraethyl orthosilicate and anhydrous aluminum chloride as precursors, ethyl ether as oxygen donor, LiF as mineralizer, and Na2SO4-NaCl as compound molten salt, mullite whisker was synthesized in the low temperature by nonhydrolytic sol-gel process combined with molten salt method. The phase transformation of mixed powder composed of mullite xerogel and molten salt during the heat treatment and the microstructure of mullite whisker corresponding to different temperature were characterized by means of DTA-TG, XRD SEM and TEM. The results show that mullite crystal phase can be formed via non-hydrolytic sol-gel process combined with the molten salt method at 750°C. The synthetic effect of mullite get better as the temperature increased to 850°C, while NaAlSiO4 crystal phase is also detected. Mullite whisker, with diameters ranging from 300~500 nm and lengths of 3~5μm, is prepared at the temperature of 850°C.

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Low temperature preparation of orthoferrite thin-films by an inorganic sol–gel process

Thin Solid Films ◽

10.1016/s0040-6090(00)01898-8 ◽

2001 ◽

Vol 385 (1-2) ◽

pp. 230-233 ◽

Cited By ~ 19

Author(s):

M. Rajendran ◽

M. Ghanashyam Krishna ◽

A.K. Bhattacharya

Keyword(s):

Thin Films ◽

Low Temperature ◽

Sol Gel ◽

Low Temperature Preparation ◽

Sol Gel Process ◽

Temperature Preparation

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Study on Mullite Whiskers Preparation via Non-Hydrolytic Sol-Gel Process Combined with Molten Salt Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.848.295 ◽

2016 ◽

Vol 848 ◽

pp. 295-300 ◽

Cited By ~ 2

Author(s):

Kai Lin Fu ◽

Wei Hui Jiang ◽

Jian Min Liu ◽

Guo Feng ◽

Mu Pan

Keyword(s):

Molten Salt ◽

Sol Gel ◽

Treatment Temperature ◽

Molten Salt Method ◽

Mass Ratio ◽

X Ray Diffraction ◽

Anhydrous Aluminum Chloride ◽

Oxygen Donor ◽

Sol Gel Process ◽

Mullite Whiskers

Mullite whiskers were prepared via non-hydrolytic sol-gel process combined with molybdate molten salt using tetraethoxysilane and anhydrous aluminum chloride as precussor, anhydrous ether as oxygen donor, molybdate as molten salt. The effects of heat treatment temperature, molten salt amount, holding time on synthesis and morphology of mullite whiskers were investigated by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The results show that the mullite whiskers appeared at the lowest temperature of 800°C, and optimized mullite whiskers could be prepared at 900°C for 8 h with the mass ratio of xerogel and molybdate as 1:2, the diameter of the whiskers was in the range of 0.15-0.22 μm with the aspect ratio of more than 40.

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