Carbothermal synthesis of spherical AlN granules: Effects of synthesis parameters and Y2O3 additive

Wang, Qi; Cui, Wei; Ge, Yiyao; Chen, Kexin; Xie, Zhipeng

doi:10.1016/j.ceramint.2015.01.114

Cited by 32 publications

(9 citation statements)

References 33 publications

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“…A SEM image of the mixtures after drying is displayed in Figure , confirming the presence of aggregates with sizes of a few micrmeters. With the aid of CaF 2 additive, however, Ca‐Si‐O‐F liquid phase is formed during the reaction, and the original aggregates of the raw materials containing SiO 2 are gradually dissolved in step1 . Then N 2 diffuses into the Ca‐Si‐O‐F liquid, which transforms into a Ca‐Si‐O‐F‐N liquid .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and growth mechanism of single crystal β‐Si₃N₄ particles with a quasi‐spherical morphology

Sun

Wang

et al. 2018

J Am Ceram Soc

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Single‐crystal β‐Si3N4 particles with a quasi‐spherical morphology were synthesized via an efficient carbothermal reduction‐nitridation (CRN) strategy. The β‐Si3N4 particles synthesized under an N2 pressure of 0.3 MPa, at 1450°C and with 10 mol% unique CaF2 additives showed good dispersity and an average size of about 650 nm. X‐ray photoelectron spectroscopy analysis revealed that there was no SiC or Si–C–N compounds in the β‐Si3N4 products. Selected‐area electron‐diffraction pattern and high‐resolution image indicated single crystalline structure of the typical β‐Si3N4 particles without an obvious amorphous oxidation layer on the surface. The growth mechanism of the quasi‐spherical β‐Si3N4 particles was proposed based on the transmission electron microscopy and energy dispersive X‐ray spectroscopy characterization, which was helpful for controllable synthesis of β‐Si3N4 particles by CRN method. Owing to the quasi‐spherical morphology, good dispersity, high purity, and single‐crystal structure, the submicro‐sized β‐Si3N4 particles were promising fillers for preparing resin‐based composites with high thermal conductivity.

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Section: Resultsmentioning

confidence: 99%

Synthesis and growth mechanism of single crystal β‐Si₃N₄ particles with a quasi‐spherical morphology

Sun

Wang

et al. 2018

J Am Ceram Soc

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“…However, these methods above mentioned called for high requirement of starting materials and the morphology of AlN powder was strongly dependent on the morphology of the aluminium source types used. Several studies have shown that different aluminum sources, raw material ratio, and reaction temperatures are the key factors that affect the quality of AlN powder [20][21]. Although many researchers have used different starting materials and mixing methods, the homogeneous mixing and good bonding between aluminum and carbon are desirable to reduce the nitridation temperature and improve the properties of AlN powders.…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF REACTION CONDITIONS ON THE SYNTHESIS OF ULTRAFINE AlN POWDER WITH GLUCOSE AS CARBON SOURCE

Hu¹

2018

Ceramics - Silikaty

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Using aluminum hydroxide (Al(OH) 3 ) and aluminum nitrate (Al(NO 3 ) 3 ·9H 2 O) as aluminum sources and highly active glucose (C 6 H 12 O 6 ) as a carbon source, we synthesized ultrafine AlN powder through carbothermal reduction-nitridation. Then, we explored the effects of aluminum sources, reaction temperature, holding time and other reaction conditions on the phase composition and micromorphology of the synthesized AlN powder. Result showed that AlN powder and different proportions of Al 2 O 3 -AlN composite powder can be prepared by controlling reaction temperature or holding time. Under the conditions of this experiment, Al(OH) 3 more beneficial as an aluminum source for carbothermal reduction-nitridation than Al(NO 3 ) 3 ·9H 2 O. The optimum reaction conditions for the synthesis of single-phase AlN powder with Al(OH) 3 as aluminum source were holding time of 3 h and temperature of 1450°C. The powder sample synthesized under this reaction condition is mainly composed of flaky, short-rod, and irregularly shaped fine particles with sizes ranging from 50 nm to 100 nm.

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“…[17][18][19] On the basis of the above considerations, we in this contribution developed a simple but efficient CRN methodology to purposefully prepare phase-pure approximate spherical b-Si 3 N 4 particles with excellent dispersity, aided by the CaO additive and an elevated N 2 pressure. [17][18][19] On the basis of the above considerations, we in this contribution developed a simple but efficient CRN methodology to purposefully prepare phase-pure approximate spherical b-Si 3 N 4 particles with excellent dispersity, aided by the CaO additive and an elevated N 2 pressure.…”

Section: Introductionmentioning

confidence: 99%

“…The reaction parameters of the CRN process, particularly N 2 pressure and special additives, can strongly affect the specific morphologies of the final nitrides, as previously reported. [17][18][19] On the basis of the above considerations, we in this contribution developed a simple but efficient CRN methodology to purposefully prepare phase-pure approximate spherical b-Si 3 N 4 particles with excellent dispersity, aided by the CaO additive and an elevated N 2 pressure. The size of b-Si 3 N 4 particles could be controllably regulated in submicro and/or microscale just by adjusting N 2 pressures.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and growth mechanism of approximate spherical β‐Si₃N₄particles via carbothermal reduction‐nitridation method

Sun

Wang

et al. 2017

J Am Ceram Soc

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In this work, an efficient carbothermal reduction‐nitridation (CRN) strategy was rationally designed to directly synthesize β‐Si3N4 powders with eminent dispersity and granularity uniformity. With the aid of CaO additive, the obtained β‐Si3N4 particles were endowed with approximate spherical morphology and smooth surface. The size of β‐Si3N4 particles could be regulated in submicro and microscale by altering N2 pressures. More significantly, the underlying growth mechanism of the β‐Si3N4 under elevated N2 pressure was comprehensively analyzed and tentatively put forward. Benefiting from the remarkable merits, the as‐synthesized β‐Si3N4 powders showed great potential for alternative fillers in the application of high thermal conductivity plastic packages.

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Carbothermal synthesis of spherical AlN granules: Effects of synthesis parameters and Y2O3 additive

Cited by 32 publications

References 33 publications

Synthesis and growth mechanism of single crystal β‐Si₃N₄ particles with a quasi‐spherical morphology

Synthesis and growth mechanism of single crystal β‐Si₃N₄ particles with a quasi‐spherical morphology

EFFECT OF REACTION CONDITIONS ON THE SYNTHESIS OF ULTRAFINE AlN POWDER WITH GLUCOSE AS CARBON SOURCE

Synthesis and growth mechanism of approximate spherical β‐Si₃N₄particles via carbothermal reduction‐nitridation method

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Carbothermal synthesis of spherical AlN granules: Effects of synthesis parameters and Y2O3 additive

Cited by 32 publications

References 33 publications

Synthesis and growth mechanism of single crystal β‐Si3N4 particles with a quasi‐spherical morphology

Synthesis and growth mechanism of single crystal β‐Si3N4 particles with a quasi‐spherical morphology

EFFECT OF REACTION CONDITIONS ON THE SYNTHESIS OF ULTRAFINE AlN POWDER WITH GLUCOSE AS CARBON SOURCE

Synthesis and growth mechanism of approximate spherical β‐Si3N4particles via carbothermal reduction‐nitridation method

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Product

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About

Synthesis and growth mechanism of single crystal β‐Si₃N₄ particles with a quasi‐spherical morphology

Synthesis and growth mechanism of single crystal β‐Si₃N₄ particles with a quasi‐spherical morphology

Synthesis and growth mechanism of approximate spherical β‐Si₃N₄particles via carbothermal reduction‐nitridation method