A fast-pyrolysis self-propagating high temperature synthesis route to single phase of boron carbide ultrafine powders

Zhang, Laiping; Gu, Yunle; Wang, Weiming; Wang, Jilin; Zhao, Guowei; Qian, Qingrong; Zhang, Zhan‐Hui; Zhang, Fang

doi:10.2109/jcersj2.119.631

Cited by 7 publications

(7 citation statements)

References 23 publications

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“…This heat could break down C 12 H 12 O 11 into active C* quickly (Eq. (4)) [36,37] . Subsequently, a part of C* reduced ZrO 2 to give more active Zr* by the carbothermal reduction reaction (Eq.…”

Section: Reaction Mechanismsmentioning

confidence: 99%

Preparation of nano-sized zirconium carbide powders through a novel active dilution self-propagating high temperature synthesis method

Long

Wang

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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High quality nano-sized zirconium carbide (ZrC) powders were successfully fabricated via a developed chemical active dilution self-propagating high-temperature synthesis (SHS) method assisted by ball milling pretreatment process using traditional cheap zirconium dioxide powder (ZrO 2 ), magnesium powder (Mg) and sucrose (C 12 H 22 O 11 ) as raw materials. FSEM, TEM, HRTEM, SAED, XRD, FTIR and Raman, ICP-AES, laser particle size analyzer, oxygen and nitrogen analyzer, carbon/sulfur determinator and TG-DSC were employed for the characterization of the morphology, structure, chemical composition and thermal stability of the as-synthesized ZrC samples. The as-synthesized samples demonstrated high purity, low oxygen content and evenly distributed ZrC nano-powders with an average particle size of 50nm. In addition, the effects of endothermic rate and the possible chemical reaction mechanism were also discussed.

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Section: Reaction Mechanismsmentioning

confidence: 99%

Preparation of nano-sized zirconium carbide powders through a novel active dilution self-propagating high temperature synthesis method

Long

Wang

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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“…28 Among them, the two characteristic peaks at 475 and 530 cm −1 in the low-frequency region are the vibrational modes of the C-B-C chain, and the two shoulder peaks at 708/813 and 990/1075 cm −1 in the high-frequency region are the characteristic vibration of the B 11 C icosahedron. 29 The red shift of the Raman peak is due to the substitution of boron and carbon atoms on the icosahedron and atomic chain, which is the main reason why boron carbide has a variety of isomers. 36 This is consistent with the XRD results.…”

Section: Phase Composition and Microstructurementioning

confidence: 99%

“…SHS is always used to synthesize refractory inorganic materials by using the self-heating and self-conduction process of high chemical reaction heat between reactants, also known as the combustion synthesis method. 29 However, the preparation of B 4 C powder by combustion synthesis method with organics as the carbon source is rarely reported. The fast and low energy consumption combustion synthesis method can be used to produce B 4 C powder with small particle size.…”

Section: Introductionmentioning

confidence: 99%

Combustion synthesized boron carbide powders by different organic carbon sources and microwave absorbing properties

Deng,

Ding,

Xiao

et al. 2024

Int J Applied Ceramic Tech

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Boron carbide powders were synthesized by combustion synthesis using organics chitosan, dextrin, cellulose, starch, and polyvinyl chloride (PVC) as carbon sources. The microwave absorbing properties of boron carbide powders synthesized by different carbon sources were investigated. The results showed that the powders synthesized using organic compounds containing Cl and N atoms as carbon sources have better absorbing properties. The peak value of reflection loss of boron carbide powder prepared with chitosan as carbon source is −46.41 dB at 2.1 mm thickness, with an effective absorption range of 9.21–12.30 GHz and an effective absorption bandwidth of 3.09 GHz. The small and uniform boron carbide grains and residual carbon with multiple morphologies enhance the interface polarization and electronic polarization in the material, which leads to multiple reflections and losses of the microwave. Additionally, the lattice defects and surface holes caused by Cl, N, and other atoms in chitosan and PVC increase the energy storage sites of the material, which makes the materials obtain excellent microwave absorbing properties. Boron carbides fabricated from an organic carbon source provide a potential for the preparation of high‐temperature resistant absorber.

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“…The mechanical properties of B 4 C, in particular fracture toughness, hardness (9.5 on the Mohs hardness scale) and strength combined with low density (2.52 g cm −3 ), are quite exceptional, relying on morphological features and may invariably deviate depending on the preparation pathway [ 1 , 2 , 3 , 4 ]. Resistance to fatigue failure is one of the critical design issues for using this material in automotive and aerospace sectors, which will be minimized due to controlling the microstructure of the target material during the synthesis procedure [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Novel Pathway for the Combustion Synthesis and Consolidation of Boron Carbide

et al. 2022

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A novel pathway for the magnesiothermic reduction of boron oxide and magnesium dodecaboride (MgB12) in the presence of carbon by a self-propagating high-temperature synthesis method was proposed that was aimed at the direct preparation of boron carbide nanopowder. The combined utilization of two boron sources, boron oxide and MgB12, allowed tailoring the overall caloric effect of the process, increasing the yield of the target product and lessening the laborious leaching process. In addition, it is an alternative way to utilize magnesium borides, which are inevitable side products at boron production. Multivariate thermodynamic calculations performed in the B2O3-MgB12-Mg-C system allowed estimating equilibrium compositions of the products and deducing the optimum composition of the initial mixture for obtaining B4C. For the latter, the adiabatic temperature (Tad) is 2100 °C, which is theoretically enough for the implementation of the self-propagating reaction. The combustion reaction was shown to be extremely sensitive to the initial mixture composition, external pressure, as well as sample diameter (heat losses). It proceeds in self-oscillatory mode and leads to the product of a layered macrostructure. The combustion product was then consolidated by the spark plasma sintering technique at different conditions. Vickers microhardness was measured, and the wear erosion behavior was examined. The variation in lattice parameters of boron carbide reflected the influence of synthesis, sintering and erosion conditions on the ordering/disordering of the boron carbide structure.

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A fast-pyrolysis self-propagating high temperature synthesis route to single phase of boron carbide ultrafine powders

Cited by 7 publications

References 23 publications

Preparation of nano-sized zirconium carbide powders through a novel active dilution self-propagating high temperature synthesis method

Preparation of nano-sized zirconium carbide powders through a novel active dilution self-propagating high temperature synthesis method

Combustion synthesized boron carbide powders by different organic carbon sources and microwave absorbing properties

Novel Pathway for the Combustion Synthesis and Consolidation of Boron Carbide

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