Obtaining the Nanostructured Nitride Composition TiN-BN Powder by the Self-Propagating High-Temperature Synthesis from the Azide KBF&lt;sub&gt;4&lt;/sub&gt;-NaN&lt;sub&gt;3&lt;/sub&gt;-Na&lt;sub&gt;2&lt;/sub&gt;TiF&lt;sub&gt;6&lt;/sub&gt; and "NH&lt;sub&gt;4&lt;/sub&gt;BF&lt;sub&gt;4&lt;/sub&gt;-NaN&lt;sub&gt;3&lt;/sub&gt;-Na&lt;sub&gt;2&lt;/sub&gt;TiF&lt;sub&gt;6&lt;/sub&gt; Systems

Kerson, Irina; Shiganova, Ljudmila

doi:10.4028/www.scientific.net/amm.698.507

Cited by 3 publications

(3 citation statements)

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“…Methods and equipment of the study were presented in the work [3]. Calculation of the mass of the components of the initial mixture was made for various ratios of AlN and BN in the composite powder: xAlN-yBN, where x and y -the number of moles, which may take the values x = 1; 2; 3; 4 when y = 1 and y = 1; 2; 3; 4 when x = 1.…”

Section: Resultsmentioning

confidence: 99%

“…This can be done not by mechanical mixing of powders of AlN and BN but by conducting chemical synthesis of these particles in the bulk of the composite in the realization of processes in-situ [2]. One of the most promising in-situ processes is the process of self-propagating high temperature synthesis (SHS), which was used to obtain TiN-BN nanostructured composite powder with the use of sodium azide and precursors of titanium and boron [3].…”

Section: Introductionmentioning

confidence: 99%

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Self-Propagating High-Temperature Synthesis of Composite Nanopowder AlN-BN from Systems "Sodium Azide – Halides of Aluminum and Boron"

Shiganova

Bichurov

Kerson

et al. 2016

KEM

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The composite powder of AlN-BN is of interest from the point of view of the use for sintering the AlN-BN composite ceramics. The ceramics compared with AlN ceramics would have better thermal shock resistance, less britlleness, better machinability, good heat conductivity and tribological properties. Possibility of obtaining a composite powder of AlN-BN with the application of process of self-propagating high-temperature synthesis (SHS) from powder mixtures of NaN3 and precursors of aluminum and boron was investigated. Halide salts AlF3, Na3AlF6, KBF4 and NH4BF4 were used as the precursors. It was shown that these mixtures are capable of burning and obtaining agglomerated composite powders from nanosized (50-170 nm) particles.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-Propagating High-Temperature Synthesis of Composite Nanopowder AlN-BN from Systems "Sodium Azide – Halides of Aluminum and Boron"

Shiganova

Bichurov

Kerson

et al. 2016

KEM

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“…Here the metal powder of aluminum, sodium azide, and halide salt NH 4 BF 4 as a precursor of boron were used [14]. Experience of application of azide SHS technology to obtain powders of AlN, TiN and TiN-BN shows that the replacement of the original powder of a metal element with its halide salt leads to a substantial decrease in the particle size of the synthesized nitride of the element and to the possibility of obtaining the nanopowder of corresponding element nitride [15][16][17].…”

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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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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Ammonium tetrafluoroborate: Novel Unprecedented Catalyst for the Synthesis of 3,4‐dihydropyrimidin‐2(1H)‐ones through Biginelli Reaction

Verma,

Chaudhary,

Verma

et al. 2024

ChemistrySelect

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A novel method has been developed to use ammonium tetrafluoroborate (NH4BF4) directly as catalyst in Biginelli reaction. A new paradigm of the Biginelli reaction for the synthesis of 3,4‐dihydropyrimidin‐2(1H)‐ones derivatives found the use of ammonium tetrafluoroborate as a novel, inexpensive, readily available, non‐toxic and mild catalyst in good to excellent yields. Notably, this is the first time that ammonium tetrafluoroborate is directly used as a catalyst in organic synthesis. So far, no organic reaction is available in literature where NH4BF4 is directly used as catalyst. However, some reactions are found where NH4BF4 is used with other catalysts as promoters or additives. The protocol developed has several advantages, such as highly efficient, simple, atom‐economical, environmentally friendly, easy synthetic and purification methods.

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Obtaining the Nanostructured Nitride Composition TiN-BN Powder by the Self-Propagating High-Temperature Synthesis from the Azide KBF<sub>4</sub>-NaN<sub>3</sub>-Na<sub>2</sub>TiF<sub>6</sub> and "NH<sub>4</sub>BF<sub>4</sub>-NaN<sub>3</sub>-Na<sub>2</sub>TiF<sub>6</sub> Systems

Cited by 3 publications

References 2 publications

Self-Propagating High-Temperature Synthesis of Composite Nanopowder AlN-BN from Systems "Sodium Azide – Halides of Aluminum and Boron"

Self-Propagating High-Temperature Synthesis of Composite Nanopowder AlN-BN from Systems "Sodium Azide – Halides of Aluminum and Boron"

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

Ammonium tetrafluoroborate: Novel Unprecedented Catalyst for the Synthesis of 3,4‐dihydropyrimidin‐2(1H)‐ones through Biginelli Reaction

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