Synthesis and Reaction Mechanism of Ti3SiC2 by Molten Salt Method from Ti-Si-Fe Alloy

2018 ◽  
Vol 768 ◽  
pp. 159-166 ◽  
Author(s):  
Jin Hua Zhang ◽  
Si Xiong ◽  
Chang Ming Ke ◽  
Hong Dan Wu ◽  
Xin Rong Lei
Keyword(s):  
Electron Microscope ◽  
Molten Salt ◽  
Raw Materials ◽  
Synthesis Method ◽  
Molten Salt Synthesis ◽  
Synthesis Process ◽  
Molten Salt Method ◽  
Synthetic Temperature ◽  
Chloride Salts ◽  
Titanium Silicon

Titanium silicon carbide (Ti3SiC2) were obtained by molten salt synthesis method using the Ti-Si-Fe alloy extracted from high titania blast furnace slag and natural graphite as the raw materials. The phase composition, microscopic structure of the products were characterized by powder X-ray diffraction, scanning electron microscope and transmission electron microscope. The influence of firing temperature and chloride salts species on the phase and morphology of the products were investigated. The results indicated that the synthetic temperature of Ti3SiC2 by molten salt synthesis method was about 100 °C, which was lower than that without molten salts. The “dissolution-precipitation” mechanism governed the overall molten salt synthesis process. The lamellar Ti3(Si,Al)C2 crystal growth obeyed by a two-dimensional ledge growth mechanism.

scholarly journals Microstructure and Morphology Control of Potassium Magnesium Titanates and Sodium Iron Titanates by Molten Salt Synthesis

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1577 ◽  
Author(s):  
Haoran Zhang ◽  
Mengshuo Li ◽  
Ze Zhou ◽  
Liming Shen ◽  
Ningzhong Bao
Keyword(s):  
Molten Salt ◽  
High Performance ◽  
Large Scale ◽  
Raw Materials ◽  
Synthesis Method ◽  
Molten Salt Synthesis ◽  
Molar Ratio ◽  
Molten Salt Method ◽  
Experimental Conditions ◽  
Potassium Magnesium

Titanates materials have attracted considerable interest due to their unusual functional and structural properties for many applications such as high-performance composites, devices, etc. Thus, the development of a large-scale synthesis method for preparing high-quality titanates at a low cost is desired. In this study, a series of quaternary titanates including K0.8Mg0.4Ti1.6O4, Na0.9Mg0.45Ti1.55O4, Na0.75Fe0.75Ti0.25O2, NaFeTiO4, and K2.3Fe2.3Ti5.7O16 are synthesized by a simple molten salt method using inexpensive salts of KCl and NaCl. The starting materials, intermediate products, final products, and their transformations were studied by using TG-DSC, XRD, SEM, and EDS. The results show that the grain size, morphology, and chemical composition of the synthesized quaternary titanates can be controlled simply by varying the experimental conditions. The molar ratio of mixed molten salts is critical to the morphology of products. When KCl:NaCl = 3:1, the morphology of K0.8Mg0.4Ti1.6O4 changes from platelet to board and then bar-like by increasing the molar ratio of molten salt (KCl–NaCl) to raw materials from 0.7 to 2.5. NaFeTiO4 needles and Na0.75Fe0.75Ti0.25O2 platelets are obtained when the molar ratio of molten salt (NaCl) to raw materials is 4. Pure phase of Na0.9Mg0.45Ti1.55O4 and K2.3Fe2.3Ti5.7O16 are also observed. The formation and growth mechanisms of both potassium magnesium titanates and sodium iron titanates are discussed based on the characterization results.

scholarly journals Low-Temperature Molten Salt Synthesis and the Characterisation of Submicron-Sized Al8B4C7 Powder

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 70
Author(s):  
Cheng Liu ◽  
Xueyin Liu ◽  
Zhaoping Hou ◽  
Quanli Jia ◽  
Benjun Cheng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Molten Salt ◽  
Raw Materials ◽  
Reaction Medium ◽  
Thermal Reduction ◽  
Molten Salt Synthesis ◽  
Synthesis Process ◽  
Direct Reaction ◽  
Liquid Reaction ◽  
Reduction Methods

Submicron-sized (~200 nm) aluminium boron carbide (Al8B4C7) particles were synthesised from Al, B4C and carbon black raw materials in a molten NaCl-based salt at a relatively low temperature. The effects of the salt type/assembly and the firing temperature on the synthesis process were examined, and the relevant reaction mechanisms discussed. The molten salt played an important role in the Al8B4C7 formation process. By using a combined salt of 95%NaCl + 5%NaF, an effective liquid reaction medium was formed, greatly facilitating the Al8B4C7 formation. As a result, essentially phase-pure Al8B4C7 was obtained after 6 h of firing at 1250 °C. This temperature was 350–550 °C lower than that required by the conventional direct reaction and thermal reduction methods.

Application of Molten Salt Method in Hercynite Composite Powder Synthesis at Elevated Temperature

2017 ◽  
Vol 726 ◽  
pp. 460-464 ◽  
Author(s):  
Yan Chai ◽  
Mei Jie Zhang
Keyword(s):  
Molten Salt ◽  
Iron Powder ◽  
Synthesis Method ◽  
Reaction Medium ◽  
Raw Material ◽  
Molten Salt Synthesis ◽  
Alumina Powder ◽  
Molten Salt Method ◽  
Powder Synthesis ◽  
Powder Content

With molten salt method, a series of the hercynite powders were prepared using FeCl2·4H2O, active alumina and iron powder as raw material and KCl molten salt as reaction medium. The phase composition and micro-morphology were studied by techniques of XRD and SEM. The results showed that a high purity hercynite-alumina powder can be synthesized by molten salt synthesis method after heat treatment at 1000 °C in reducing atmosphere, the main phases were hercynite and α-Al2O3, and the increasing iron powder content can raise hercynite production quantity with developed crystal grain, the grain size was increased from 6μm to 10μm.

scholarly journals Facile molten salt synthesis of zirconia whiskers

2018 ◽  
Vol 12 (3) ◽  
pp. 257-261 ◽  
Author(s):  
Tao Wang ◽  
Jianmin Liu ◽  
Weihui Jiang ◽  
Guo Feng ◽  
Lifeng Miao ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Molten Salt ◽  
Reaction Temperature ◽  
Molten Salt Synthesis ◽  
Heating Process ◽  
Molten Salt Method ◽  
Sodium Zirconium ◽  
Transmission Electron ◽  
Mixture Phase ◽  
Average Aspect Ratio

ZrO2 whiskers have been synthesized by a facile molten salt method using ZrOCl2 ? 8H2O and Na3PO4 ? 12H2O as the zirconium source and molten salt, respectively. Differential thermal and thermogravimetric analyses, Xray diffraction analysis, field emission scanning electron microscope and transmission electron microscope were employed to characterize the heating process of the precursor mixture, phase composition of the assynthesized ZrO2 whiskers and the effect of reaction temperature on the synthesis of ZrO2 whiskers. The results show that the ZrO2 whiskers synthesized at 900?C have an average aspect ratio of 30 and preferentially grow along [010] direction. The formation of sodium zirconium phosphate [Na9-4xZrx(PO4)3] (x = 1, 2) and the reaction temperature play an important role in the growth of ZrO2 whiskers. This work also suggests an effective route for mass production of high quality ZrO2 whiskers.

Enhancing the electrochemistry performance of Li4Ti5O12 for Li-ion battery anodes by a sol–gel assisted molten salt method and graphene modification

RSC Advances ◽  
2016 ◽  
Vol 6 (111) ◽  
pp. 110032-110039 ◽  
Author(s):  
Qingjun Guo ◽  
Qiang Wang ◽  
Gang Chen ◽  
Qixin Shen ◽  
Bing Li
Keyword(s):  
Molten Salt ◽  
Sol Gel ◽  
Molten Salt Synthesis ◽  
Synthesis Process ◽  
Molten Salt Method ◽  
Li Ion Battery ◽  
Li Ion

Graphene modified Li4Ti5O12 composites (G-LTO) with highly crystallinity and favourable dispersity were prepared via a sol–gel assisted molten salt synthesis process.

Preparing high surface area porous carbon from biomass by carbonization in a molten salt medium

RSC Advances ◽  
2015 ◽  
Vol 5 (92) ◽  
pp. 75728-75734 ◽  
Author(s):  
Huishan Shang ◽  
Yanjie Lu ◽  
Feng Zhao ◽  
Cong Chao ◽  
Bing Zhang ◽  
...  
Keyword(s):  
Molten Salt ◽  
Surface Area ◽  
Porous Carbon ◽  
High Surface ◽  
High Surface Area ◽  
Molten Salt Synthesis ◽  
Synthesis Process ◽  
Salt Medium ◽  
Peanut Shells

Peanut shells were transformed into porous carbon with a high surface area through a simple ZnCl2-molten salt synthesis process.

MOLTEN SALT SYNTHESIS OF YF3:Yb3+/Ln3+(Ln = Er3+, Tm3+) MICROSHEETS WITH MULTICOLOR UPCONVERSION LUMINESCENCE

2013 ◽  
Vol 06 (06) ◽  
pp. 1350061 ◽  
Author(s):  
MINGYE DING ◽  
CHUNHUA LU ◽  
LINHAI CAO ◽  
YARU NI ◽  
ZHONGZI XU
Keyword(s):  
Molten Salt ◽  
Laser Diode ◽  
Upconversion Luminescence ◽  
Emission Spectra ◽  
Upconversion Emission ◽  
Molten Salt Synthesis ◽  
Molten Salt Method ◽  
Orthorhombic System ◽  
Co Doping ◽  
First Time

In this paper, highly crystalline YF 3: Yb 3+/ Ln 3+( Ln = Er 3+, Tm 3+) microsheets were successfully synthesized by a surfactant-free molten salt method for the first time. The results indicated that the as-obtained samples belonged to orthorhombic system and exhibited microsheets morphology with side lengths of 30 to 80 μm and wall thickness from 1 to 1.5 μm. By changing the dopant's species ( Ln 3+), multicolor (yellow and blue) upconversion emission can be observed in YF 3: Yb 3+/ Ln 3+ microsheets under 980 nm laser diode (LD) excitation. The upconversion mechanisms in co-doping YF 3 samples were analyzed in detail based on the emission spectra. Importantly, this approach not only proposes a new alternative in synthesizing such materials, but also opens the possibility to meet the increasing commercial demand.

scholarly journals Microwave-Assisted Molten-Salt Facile Synthesis of Chromium Carbide (Cr3C2) Coatings on the Diamond Particles

2019 ◽  
Vol 38 (2019) ◽  
pp. 370-379 ◽  
Author(s):  
Lei Xu ◽  
Chenlong Wei ◽  
Wei Li ◽  
Libo Zhang ◽  
Jinhui Peng
Keyword(s):  
Molten Salt ◽  
Chromium Carbide ◽  
Coating Thickness ◽  
Raw Materials ◽  
Heating Temperature ◽  
Molten Salt Synthesis ◽  
Positive Role ◽  
Temperature Range ◽  
Microwave Assisted ◽  
Diamond Particles

AbstractChromium carbide (Cr3C2) coatings on the diamond were fabricated using the mixtures of molten salt of NaCl and BaCl2, powders of metallic chromium and diamond as raw materials in the temperature range of 750–900 °C by the microwave-assisted molten-salt synthesis. The morphology, microstructure and phase composition of the surface layer were characterized by Scanning Electron Microscopy, Energy-dispersive Spectrometry and X-ray diffraction. The results show that the surface of the diamond particles could be coated with Cr, forming a uniform and continuous Cr3C2-coated layer. The coatings thickness on the diamond can be controlled by adjusting the heating temperature and time. The coating thickness expanded from 0.73 to 2.30 µm when the temperature was increased from 750 °C to 900 °C, and increasing rapidly during the temperature range of 800  °C–850  °C, the coating thickness expanded from 1.30 to 2.80 µm when the holding time was increased from 0.5 h to 4 h. The results illustrate that the microwave-assisted molten salt synthesis plays a positive role in chromium coatings on the diamond, offering a potent method for the surface metallization of diamond.

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