Carbothermal route for preparation of boron carbide powder from boric acid–citric acid gel precursor

Sinha, Amit; Mahata, T.; Sharma, B.P.

doi:10.1016/s0022-3115(02)00704-3

Cited by 111 publications

(65 citation statements)

References 9 publications

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“…The condensation reaction between Si-OH and Si-OH or B-OH took place, generating an appropriate degree of cross-linking within silicone resin. [24][25][26][27][28] The quartz fibers used in the study was supplied by Hubei Feilihua quartz glass Co., LTD. The density was 2.2 g. cm -3 and the diameter of fiber was 7.5 μm.…”

Section: Preparation Of Materialsmentioning

confidence: 99%

Effect of Surface Modification on Mechanical Properties of Quartz Fiber Reinforced Boron Doped Silicone Resin Composites

Yu¹,

Pei²,

Chen³

2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

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Abstract. 3-triethoxysilylpropylamine (KH550) polymer was coated on quartz fibers by a simple dipping process without any complex chemical treatments in order to increase the bonding strength between quartz fibers and boron doped silicone resin matrix. The effect of coating on the interface of quartz fiber reinforced composites was evaluated by scanning electron microscope (SEM), FTIR, DTA-TG and flexural strength of unidirectional composites. Results indicated that the coating played an important role in improving the interfacial adhesion and thermal stability of quartz fibers composites. The FTIR result showed that Si-O-B bonds in silicone resin chain decomposed when the heat treatment temperature increased to 500. The composites with KH550 coatings exhibited better ℃ room temperature and high temperature flexural strength than those of the composites without KH550 coatings.

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Section: Preparation Of Materialsmentioning

confidence: 99%

Effect of Surface Modification on Mechanical Properties of Quartz Fiber Reinforced Boron Doped Silicone Resin Composites

Yu¹,

Pei²,

Chen³

2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

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“…Its ultrahigh hardness, high wear and impact resistance and low specific weight, and good chemical stability make it suitable for application in ball mills, blasting nozzles, wheel dressing tools, wire drawing dies, rocket propellant, light weight armour plates and mechanical seal faces, as well as for grinding and cutting tools etc [11]. It is an excellent neutron absorption material used in the nuclear industry due to its high neutron absorption coefficient [12,13]. Densification of monolithic B 4 C powder requires high temperatures, usually above 2160°C, or application of high pressures owing to the covalent bonds [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Boron carbide can be prepared by reaction of elemental boron and carbon powder, in a self-propagating high-temperature synthesis (SHS), the carbothermal route, reduction of BCl 3 by CH 4 at 1500°C by laser and low temperature synthesis from a CCl 4 , BBr 3 and Na mixture [10,12,17].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characteristics of nanocrystalline materials in Ti, B, C and N containing system

et al. 2011

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Abstract:In this work, the results of investigations of manufacturing ceramic materials on the basis of Ti, B, C and N containing systems are presented. The nanocrystalline ceramics were synthesized using a non-hydrolytic sol-gel method. The process was carried out in two stages. In the first low-temperature stage the precursor was obtained. The synthesis of ceramic phases, however, was conducted in the second high-temperature stage, in an argon atmosphere. Depending on the initial composition of the mixtures, the temperature and the time, the following products were obtained: TiC x , TiC x N 1−x , TiB 2 and B 4 C. The course of the process was investigated by thermogravimetric and differential scanning calorimetry methods (TG-DSC) coupled with mass spectrometry (MS). The solid state products were identified with use of X-ray diffraction (XRD). The size of the crystallites was estimated by the Scherrer method. The structure and morphology images of nanocrystalline powders were obtained using scanning electron microscopy (SEM) and transmission electron microscopy (TEM).

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“…Boron carbide can typically be produced by carbothermal reduction of boric acid or boron oxide at temperature above 1000 ºC [5,6]. However, obtained products are generally contaminated with carbon compounds.…”

Section: Introductionmentioning

confidence: 99%

“…However, obtained products are generally contaminated with carbon compounds. Moreover, these products are ordinarily large grains in micrometer size, and consequently need a further milling process, which possibly contaminates the products from the grinding media, to produce small particles [6]. Chemical vapor deposition (CVD) is also employed for boron carbide particle fabrication, although BCl 3 and borane gases with strong toxicity have to be used as a boron source [7].…”

Section: Introductionmentioning

confidence: 99%

Boron carbide particle fabrication by pulsed laser irradiation of boron particle dispersed in organic solvent with various wavelengths

Ishikawa

Koshizaki

2009

Trans. Mat. Res. Soc. Japan

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B 4 C spherical particles were fabricated by laser irradiation at various wavelengths (355, 532, and 1064 nm) of B dispersed in organic solvents. Obtained B 4 C yields were 78, 90, and 84% in ethanol and 68, 82 and 65% in ethyl acetate by irradiation at 355, 532 and 1064 nm. The highest B 4 C yield was obtained at 532 nm in each solvent. Important factors for large B 4 C yield were considered to be laser irradiation at long wavelength and large absorbance.

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Carbothermal route for preparation of boron carbide powder from boric acid–citric acid gel precursor

Cited by 111 publications

References 9 publications

Effect of Surface Modification on Mechanical Properties of Quartz Fiber Reinforced Boron Doped Silicone Resin Composites

Effect of Surface Modification on Mechanical Properties of Quartz Fiber Reinforced Boron Doped Silicone Resin Composites

Synthesis and characteristics of nanocrystalline materials in Ti, B, C and N containing system

Boron carbide particle fabrication by pulsed laser irradiation of boron particle dispersed in organic solvent with various wavelengths

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