Aluminum nitride. Preparation methods

Elagin, A. A.; Бекетов, А. Р.; Баранов, М. В.; Шишкин, Р. А.

doi:10.1007/s11148-013-9546-2

Cited by 11 publications

(7 citation statements)

References 15 publications

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“…In accordance with the data obtained in [13], the temperature dependence of the pressure of aluminum monofluoride and aluminum trifluoride is represented by the following equations: lgP (AlF 3 ) = 13.729 -1290/T, (5) lgP (AlF) = 10.952 -11800/T,…”

Section: Methodssupporting

confidence: 72%

“…The presence of even a small amount of oxygen in the material significantly reduces its thermal conductivity (the most important property of aluminum nitride) due to the formation of oxides and oxynitrides on the surface of the grains. The articles [4,5] presented a detailed survey of the methods used to obtain aluminum nitride and discussed each method's positive and negative aspects. For example, powders obtained by industrial methods -carbothermic reduction and direct nitriding -are not very pure.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Analysis of a New Gas-Phase Method of Obtaining High-Purity Aluminum Nitride

et al. 2015

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Ultradispersed high-purity aluminum nitride powder was obtained at the Physico-Technological Institute on a unique experimental-industrial unit by a gas-phase method. The powder was obtained through the formation of aluminum monofluoride. However, there has been very little thermodynamic analysis of the interactions of the materials in the reaction zone and in the charge. This study gives special attention to the selection of sintering additives and their effect on the removal of undesirable oxygen impurities during the synthesis of aluminum nitride. The mix that was obtained for sintering can be used for the energy-efficient single-stage production of aluminum-nitride finished products having excellent thermal conductivity.

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Section: Methodssupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of a New Gas-Phase Method of Obtaining High-Purity Aluminum Nitride

et al. 2015

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“…The existence of this kind of c-Al 2 O 3 , which can be a calcinated product of hydrogenated boehmite as expressed in Eq. 4 [35], suggests that the as-received AlN was partially hydrolysed before a calcination process during the manufacturing process, but we cannot rule out the presence of c-Al 2 O 3 from the AlN synthesis process [33]. No obvious features of Al(OH) 3 crystal structure can be found in XRD patterns, which indicate the hydrolysation of the as-received AlN is in a favourable condition in terms of the hydrolysis issue.…”

Section: Aln Characterisationmentioning

confidence: 83%

“…A following dehydration process (calcination) of the surface-hydrolysed AlN is reported to form an alumina shell and hinder further hydrolysis [32], and a similar calcination process can be found in many AlN synthesis methods as the last step, e.g. the carbon residue will need to be burnt off at 700°C in a carbothermal synthesis method [33]. Therefore, as illustrated in Eqs.…”

Section: Aln Characterisationmentioning

confidence: 92%

Effect of water on the breakdown and dielectric response of polypropylene/nano-aluminium nitride composites

et al. 2020

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The influence of water immersion and silane treatment on the AC breakdown and the complex dielectric response of polypropylene/nano-aluminium nitride (PP/nano-AlN) composites has been investigated. The as-received filler was examined to have a nanoscale particle distribution with a hexagonal shape and slight hydrolysation. Grafting the aluminium nitride with an octyl silane reduces the weight increase in samples filled with 10 wt% of aluminium nitride during water immersion by 3, from 0.29 to 0.09%. The results suggest that the AC breakdown strength and complex permittivity of ''wet'' composite samples are related to the silane treatment of the nanofiller. The AC breakdown strength of octyl silane-treated samples after 9 days of water immersion shows comparable results to the dry samples, while a reduction can be seen on non-treated samples. Although silane-treated samples still show an increased dielectric loss at low frequency after water immersion, a significant reduction in low-frequency dispersion of real and imaginary permittivity can be seen when compared to the non-treated composites. This indicates that significant gains can be obtained for PP/nano-AlN composites by suitable silane treatments.

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“…However no method exists providing industrial preparation of high-purity aluminium nitride [4,5]. A number of works [4 -7] consider new promising gas-phase synthesis of aluminium nitride.…”

Section: Introductionmentioning

confidence: 99%

Graphite Behavior During a gas Phase Method for Aluminum Nitride Preparation

et al. 2015

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Purity of AlN, synthesized by means of gas-phase technology, depends to a considerable extent on charge component and intermediate compound reactions with structural materials. Chemical aspects are considered for transformations and the nature of reaction of aluminium fluoride and nitride with different types of graphite, the effect of fluorides on final synthesis product is revealed, and chemical aspects of their reaction with graphite during AlN synthesis are explained. The possibility is established of creating a protective coating on graphite made of chemically deposited AlN. Calculated and experimental data are obtained for developing a modernized industrial test unit for preparing high purity fine AlN.

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Aluminum nitride. Preparation methods

Cited by 11 publications

References 15 publications

Thermodynamic Analysis of a New Gas-Phase Method of Obtaining High-Purity Aluminum Nitride

Thermodynamic Analysis of a New Gas-Phase Method of Obtaining High-Purity Aluminum Nitride

Effect of water on the breakdown and dielectric response of polypropylene/nano-aluminium nitride composites

Graphite Behavior During a gas Phase Method for Aluminum Nitride Preparation

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