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Contact

Norberto LABRADOR

Norberto.labrador@icam.fr

Icam Grand Paris Sud

Results and conclusion

  • A single-chamber reactor was designed for the synthesis of nanometric powders of AlN
  • AlN nanoparticles can be obtained starting from Al and just N2, as precursors
  • The synthesized AlN particles, appears as agglomerates, with diameter between 130 and 180 nanometers, constituted by particles of 10 to 80 nanometers.
  • The nano powders were recovered by a carbon layer of 10 nm

Methodologies/methods

  • AlN nano powders were synthetized by using a 200kW non-transferred arc plasma nitrogen.
  • The single chamber plasma reactor presented a high thermal gradient and an oversaturation in nitrogen.
  • Thermodynamic modelling was conducted in order to achieve the best condition for AlN synthesis

Juin 2023

Keywords : AlN nano-powders, Thermal Plasma, Single-chamber reactor

Context

  • AlN, was synthesized by firts time in 1876
  • By the 90’s: it was reported that the thermal conductivity of an oxygen-free AlN monocrystal could reach 320 W.m-1.K-1 against Al about 400 W.m-1.K-1
  • Application in electronic industry: integrated electronic compacts and micro-components

Légende

a) AlN wurzite type ceramic, b) microstructure and c) properties

SYNTHESIS OF ALUMINUM NITRIDE (AlN) NANOPOWDERS

USING A THERMAL PLASMA REACTOR

Universidad Simón Bolívar

Caracas, Venezuela

PROPERTY*

AlN

Al2O3

BeO

Thermal conductivity to 25°C (W/mK)

170-220

20-30

250-300

Density (g.cm-3)

3,26

3,97

3,01

TEC 25 to 400°C (x10-6°C-1)

4,3-4,6

6,7-7,3

7,5-8,0

Hv (GPa)

12

25

12

E (GPa)

343

378

378

Dielectric Lost 25°C, 1 MHz (x10-4)

1-5

2-3

1-5

Chemical equilibrium composition of Al=1; C=1; N2=20 versus temperature,

as a function of the oxygen concentration in moles

Elemental composition, analyzed by EDS yielded an atomic%

content of 44.88% of Al and 55.12% of N

AlN/Carbon layer n-powder characterization by TEM

a)

b)

c)

AlN

AlN

Schematic representation of nanopowder formation

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