Phase and morphology studies of B4C–SiC nanocomposite powder synthesized by MASHS method in B2O3, Mg, C and Si system

Roghani, Hamed; Tayebifard, Seyed Ali; Kazemzadeh, Asghar; Nikzad, Leila

doi:10.1016/j.apt.2015.05.007

Cited by 10 publications

(4 citation statements)

References 25 publications

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“…Moreover, the calculated adiabatic temperature for α = 2 in SiO 2 +αMg binary mixture is 5942 K, which is much more than the minimum allowed adiabatic temperature that is required for a self‐propagating reaction. Therefore, the reaction was exothermic and self‐sustaining [14].…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of nanocrystalline silicon using the recrystallisation of binary silica cryogel/Mg system via self‐propagating high‐temperature combustion in the presence of NaCl as a metal halide diluent

Nangir

Massoudi

Yazdani-Rad

et al. 2018

Micro & Nano Letters

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Self-propagating high-temperature synthesis as a low energy consumption and simple approach was employed to synthesise silicon nanocrystal from the monolithic silica cryogel prepared by freeze drying. The recrystallisation process of silicon was investigated under combustion at 800, 900 and 1000°C and the uniform coral-like structure was achieved at 1000°C. The results of Raman and X-ray diffraction analysis showed the decrease in ignition time to 40 s for 1000°C temperature, leading to the decrement of crystalline size to 10.85 A°and the raise of average lattice strain to 0.152% due to accelerating recrystallisation. In addition, NaCl diluent consumed the excess heat generated during exothermic reaction and decreased the crystalline size to 10.79 A°thanks to its 0.8 W/m K thermal conductivity.

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Section: Resultsmentioning

confidence: 99%

“…In this case, the reactions require pre-activation, e.g. chemical oven [13], ball milling process [14] and so on. Mechanical activation based on collision between particles either together or with the cup wall creates numerous defects in their surface, which results in an enhance in the activation energy.…”

mentioning

confidence: 99%

Synthesis of nanocrystalline silicon using the recrystallisation of binary silica cryogel/Mg system via self‐propagating high‐temperature combustion in the presence of NaCl as a metal halide diluent

Nangir

Massoudi

Yazdani-Rad

et al. 2018

Micro & Nano Letters

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“…The use of high-energy and fast agitators for the preparation of raw materials [28,29] as well as the stimulants such as microwave energy are among these efforts [30,31]. Attempts have been made to employ materials with high reactivity and high combustion heat such as magnesium to provide the energy needed for synthesis and to reduce the process temperature, which have led to the invention of the magnesiothermal method for the synthesis of B4C [32,33]. Commendable efforts have been done to employ other carbon sources, and researchers have tried to use materials that are more reactive and require less activation energy than activated carbon or graphite [34].…”

Section: Introductionmentioning

confidence: 99%

Performance of glucose, sucrose and cellulose as carbonaceous precursors for the synthesis of B4C powders

et al. 2022

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Boron carbide is the third hardest material in the world after diamond and cubic boron nitride, which is one of the most strategic engineering ceramics in various industrial applications. The aim of this research is to synthesize B4C by reacting boric acid as boron source with polymers from the saccharide family as carbon sources, and to determine the best saccharide as precursor. For this purpose, glucose (monosaccharide), sucrose (disaccharide), and cellulose (polysaccharide) were used and examined. The samples were prepared by appropriate mixing of the starting materials, pyrolysis at 700 °C, and synthesis at 1500 °C. The results of Fourier transform infrared (FT-IR) spectroscopy and X-ray diffractometry (XRD) showed that among the studied saccharide polymers, glucose is the best carbon source candidate for the synthesis of B4C. To describe precisely, the specimen prepared with glucose and boric acid had more boron carbide and less hydrocarbon.

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“…The results of our studies show that if nitride, boride, carbide and silicide compounds as secondary phase (reinforced phase) are added to Al 2 O 3 as the matrix phase, mechanical and physical properties are significantly increased [6][7][8][9][10][11][12][13] . Various methods have been used for synthesis of composite powders including 1-in situ synthesis (mechanical alloying, reaction sintering, combustion synthesis (CS), self-propagating high temperature synthesis (SHS), carbothermic reduction, sol-gel, vortex casting and…) [14][15][16][17][18] and 2-non in situ synthesis (powder metallurgy) 19,20 .…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis on the Milled Al+B2O3+Si+WO3 System to Synthesize Al2O3-WxSiy-WxBy Powders

Moghaddam

Kalantar

2020

Mat. Res.

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Composites including silicide of tungsten and boride of tungsten intermetallic compound as reinforced agents in alumina matrix have a good mechanical properties in low and high temperature (high friction resistance, strength, resin stance to creep and relatively high thermal shock resistance), moreover, they have chemical neutral with a high corrosion resistance in a high corrosive and high temperature environment. The purpose of this study is to investigate thermal analysis, phase and microstructural evaluation during synthesis of above mentioned composite by combustion aluminothermic processing in three systems 1-Al+Si+WO 3 , 2-Al+B 2 O 3 +WO 3 and 3-Al+B 2 O 3 +Si+WO 3. A Ball-milled starting material according to stoichiometric ratio was thermal analyzed (DTA-TGA) for each of above mentioned system. The XRD results never show any new phase during ball-milling even up to 10 hours. The forming of tungsten silicide (W x Si y) is in lower temperature in comparison with tungsten boride (W x B y) during the thermal analysis experiments. The presence of Si in the Al+B 2 O 3 +WO 3 system facilitates the formation of tungsten borides. The microstructural observations show a uniform and dense distribution of silicide and boride of tungsten in the alumina matrix. Silicide phases are small grain with spherical morphology whereas; the boride phases are coarser and relatively elongated with irregular morphology.

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Phase and morphology studies of B4C–SiC nanocomposite powder synthesized by MASHS method in B2O3, Mg, C and Si system

Cited by 10 publications

References 25 publications

Synthesis of nanocrystalline silicon using the recrystallisation of binary silica cryogel/Mg system via self‐propagating high‐temperature combustion in the presence of NaCl as a metal halide diluent

Synthesis of nanocrystalline silicon using the recrystallisation of binary silica cryogel/Mg system via self‐propagating high‐temperature combustion in the presence of NaCl as a metal halide diluent

Performance of glucose, sucrose and cellulose as carbonaceous precursors for the synthesis of B4C powders

Thermal Analysis on the Milled Al+B2O3+Si+WO3 System to Synthesize Al2O3-WxSiy-WxBy Powders

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