Production and properties of AlN–BN composite

Makarenko, G. N.; Krushinskaya, L. A.; Fedorus, V. B.; Dubovik, T. V.; Kоtkо, А. V.; Andreeva, M. G.; Уварова, І. В.

doi:10.1007/s11106-011-9286-0

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…In most of the systems studied, the combustion temperature is below 1200 o C, so such combustion temperature is not sufficient to synthesize completely not BN only, but AlN also in these cases. Note that gas nitriding the AlB 2 precursor in the similar temperature range 600-1200°C is also accompanied by the formation of by-product AlB 12 [12] and only the rise of temperature of the gas nitriding up to 1600-1900 o C allows to achieve a 94% conversion of AlB 2 in homogeneous composite powder of AlN-BN [5].…”

Section: Resultsmentioning

confidence: 99%

“…Gas nitriding in less severe conditions: in a stream of nitrogen for 1 hour at 600°C and then for 1 hour at 1200°C, resulted in fabricaton of a composite nanopowder AlN-BN mixed with 10-15 wt. % AlB 12 , the decomposition of which requires higher temperatures [12]. Methods of self-propagating high temperature synthesis (SHS) of nitrides, based on the application of the combustion process to obtain a powder mixture of AlN and BN in one stage, are less costly.…”

Section: Introductionmentioning

confidence: 99%

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Study of Possibility of Obtaining Nanopowder Composition of "Aluminum Nitride – Boron Nitride" by Azide SHS Technology

Shiganova

Bichurov

Kerson

et al. 2016

KEM

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Processes and products of combustion of systems of "sodium azide – aluminum and boron halides " are studied. Halide salts AlF3, Na3AlF6, KBF4 and NH4BF4 are used as precursors of Al and B elements. The measured combustion temperature is in the range from 900 to 1800°C. It is established that the end product of combustion synthesis consists of several phases, not only the target phases (AlN and BN), but also the by-products (Na3AlF6, К2NaAlF6, NaF, KF), part of which is removed by water washing. The composite powder of AlN-BN is formed only in the case of AlF3 as precursor of Al; in doing so, it is formed with side, impurity product К2NaAlF6 or Na3AlF6. In the case of precursor Na3AlF6, the washed product of SHS may only be a by-product К2NaAlF6 or Na3AlF6 or along with the by-product, it may contain AlN or BN, but not their composition. That is explained by different combustion temperature.The structure formation of the composite powder is investigated. The obtained agglomerated nitride nano- and micropowders have an irregular and predominantly acicular shape with an average particle size of 50-170 nm in the agglomerates.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of Possibility of Obtaining Nanopowder Composition of "Aluminum Nitride – Boron Nitride" by Azide SHS Technology

Shiganova

Bichurov

Kerson

et al. 2016

KEM

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“…The flexural strength of the composite ceramics decreased slowly when the BN content was increased. Makarenko et al [20] utilized low-temperature aluminum diboride (AlB 2 ) as a precursor to produce the composite AlN-BN-based powders. Then the compact samples were hot pressed from the synthesized powders with the bending strength of 235-240 MPa.…”

Section: Introduction mentioning

confidence: 99%

Improvement in mechanical properties in AlN-h-BN composites with high thermal conductivity

et al. 2021

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It is possible to improve the machinability of aluminum nitride-hexagonal boron nitride (AlN-h-BN) ceramics while maintaining high strength and high thermal conductivity. The composite ceramics with 0–30 wt% BN as secondary phase were prepared by hot pressed sintering, using yttrium oxide (Y2O3) as sintering aid. The phase composition, density, microstructure, mechanical properties, thermal conductivity, and dielectric properties were investigated. The sintering additives were favorable to purify the grain boundaries and improve densification, reacting with oxide impurities on the surface of raw material powder particles. The optimum BN content improved the flexural strength and fracture toughness of composite ceramics with 475 MPa and 4.86 MPa·m1/2, respectively. With increasing the amount of BN, the thermal conductivity and hardness of composites gradually decreased, but the minimum value of thermal conductivity was still 85.6 W·m−1·K−1. The relative dielectric constant and dielectric loss tangent of the samples ranged from 6.8 to 8.3 and from 2.4 × 10−3 to 6.4 × 10−3, respectively, in 22–26 GHz.

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Hot-pressing sintered AlN-BN ceramics with high thermal conductivity and low dielectric loss

Yang

Wang

Zhao

et al. 2020

Ceramics International

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Production and properties of AlN–BN composite

Cited by 6 publications

References 9 publications

Study of Possibility of Obtaining Nanopowder Composition of "Aluminum Nitride – Boron Nitride" by Azide SHS Technology

Study of Possibility of Obtaining Nanopowder Composition of "Aluminum Nitride – Boron Nitride" by Azide SHS Technology

Improvement in mechanical properties in AlN-h-BN composites with high thermal conductivity

Hot-pressing sintered AlN-BN ceramics with high thermal conductivity and low dielectric loss

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