Combustion synthesis of boron nitride via magnesium reduction using additives

Chung, Shyan Lung; Hsu, Yu Feng

doi:10.1016/j.ceramint.2014.09.080

Cited by 16 publications

(17 citation statements)

References 41 publications

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“…In all the studies mentioned above, however, commercially available h-BN powders were used and inconsistency was often found between their experimental results. Recently, we have developed a combustion synthesis method for the synthesis of h-BN powder [22], which is characterized by low energy consumption, fast reactions, simple processing and low production cost. As mentioned previously, the interface between h-BN particles and epoxy resin presents a major thermal barrier in the heat conduction of composites.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Epoxy Resin Composites Filled with Combustion Synthesized h-BN Particles

Chung

Lin

2016

Molecules

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Abstract:The thermal conductivity of epoxy resin composites filled with combustion-synthesized hexagonal boron nitride (h-BN) particles was investigated. The mixing of the composite constituents was carried out by either a dry method (involving no use of solvent) for low filler loadings or a solvent method (using acetone as solvent) for higher filler loadings. It was found that surface treatment of the h-BN particles using the silane 3-glycidoxypropyltrimethoxysilane (GPTMS) increases the thermal conductivity of the resultant composites in a lesser amount compared to the values reported by other studies. This was explained by the fact that the combustion synthesized h-BN particles contain less -OH or active sites on the surface, thus adsorbing less amounts of GPTMS. However, the thermal conductivity of the composites filled with the combustion synthesized h-BN was found to be comparable to that with commercially available h-BN reported in other studies. The thermal conductivity of the composites was found to be higher when larger h-BN particles were used. The thermal conductivity was also found to increase with increasing filler content to a maximum and then begin to decrease with further increases in this content. In addition to the effect of higher porosity at higher filler contents, more horizontally oriented h-BN particles formed at higher filler loadings (perhaps due to pressing during formation of the composites) were suggested to be a factor causing this decrease of the thermal conductivity. The measured thermal conductivities were compared to theoretical predictions based on the Nielsen and Lewis theory. The theoretical predictions were found to be lower than the experimental values at low filler contents (< 60 vol %) and became increasing higher than the experimental values at high filler contents (> 60 vol %).

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Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Epoxy Resin Composites Filled with Combustion Synthesized h-BN Particles

Chung

Lin

2016

Molecules

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“…A variety of methodologies/techniques have been used to prepare h-BN powders with different sizes and purities, such as gas-solid or solid state reaction routes [12,13], carbothermic reduction and nitridation [14], chemical vapor deposition [15][16], autoclave route [17][18], and self-propagation high-temperature synthesis methods [19][20][21][22]. Amongst these methods, studies showed that the yield and crystallization of 4 as-prepared h-BN were promoted by adding alkali metal carbonate or alkaline earth oxides at a low content.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of hexagonal boron nitride nanoplates via molten-salt-mediated magnesiothermic reduction

Zhao

Liang

et al. 2015

Ceramics International

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“…Nitrogen atoms formed as a result of dissolution of nitrogen in the melt. Amorphous BN nanoparticles were generated by the reaction of B and N at high temperature as reaction (4). Amorphous BN can be thermally transformed into t-BN at a temperature above 800°C.…”

Section: Formation Process Of the R-bn And H-bn In The Molten Saltmentioning

confidence: 99%

“…Owing to these properties, boron nitride can be widely used as lubricants, electrical insulators and refractories [1][2][3][4]. Usually, BN has a partially disordered phase: turbostratic BN (t-BN) [5][6][7] and two graphite-like phases: hexagonal BN (h-BN), rhombohedral BN (r-BN) [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Catalyzed synthesis of rhombohedral boron nitride in sodium chloride molten salt

Liang

Zhao

et al. 2016

Ceramics International

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Combustion synthesis of boron nitride via magnesium reduction using additives

Cited by 16 publications

References 41 publications

Thermal Conductivity of Epoxy Resin Composites Filled with Combustion Synthesized h-BN Particles

Thermal Conductivity of Epoxy Resin Composites Filled with Combustion Synthesized h-BN Particles

Facile synthesis of hexagonal boron nitride nanoplates via molten-salt-mediated magnesiothermic reduction

Catalyzed synthesis of rhombohedral boron nitride in sodium chloride molten salt

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