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Peculiarities of γ-Al(2)O(3) Crystallization on the Surface of h-BN Particles
The main goal of the present work was to synthesize a composite consisting of h-BN particles coated with a γ-Al(2)O(3) nanolayer. A method was proposed for applying nanocrystalline γ-Al(2)O(3) to h-BN particles using a sol–gel technique, which ensures the chemical homogeneity of the composite at the...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9693325/ https://www.ncbi.nlm.nih.gov/pubmed/36431540 http://dx.doi.org/10.3390/ma15228054 |
Sumario: | The main goal of the present work was to synthesize a composite consisting of h-BN particles coated with a γ-Al(2)O(3) nanolayer. A method was proposed for applying nanocrystalline γ-Al(2)O(3) to h-BN particles using a sol–gel technique, which ensures the chemical homogeneity of the composite at the nano level. It has been determined that during crystallization on the h-BN surface, the proportion of spinel in alumina decreases from 40 wt.% in pure γ-Al(2)O(3) to 30 wt.% as a result of the involvement of the B(3+) ions from the surface nitride monolayers into the transition complex. For comparison, nano-alumina was synthesized from the same sol under the same conditions as the composite. The characterization of the obtained nanostructured powders was carried out using TEM and XRD. A mechanism is proposed for the formation of a nanostructured γ-Al(2)O(3)@h-BN composite during the interaction of Al-containing sol and h-BN suspension in aqueous organic media. The resulting composite is a promising model of powdered raw materials for the development of fine-grained ceramic materials for a wide range of applications. |
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