Synthesis of AlN by Direct Combustion of Mg-Al Alloy Powder

doi:10.15541/jim20180244

Abstract

Abstract:

Aluminum nitride (AlN) was synthesized by direct combustion of spherical Mg-Al alloy powder in air. The alloy (Al₁₂Mg₁₇) heaped up within a heating area (1 cm in diameter) and was ignited by butane flame. Synthetic process was recorded by a high-speed camera. Morphology and phase makeup of initial powder and combustion products were analyzed by scanning electron microscope and X-ray diffraction. Thermodynamic property of the alloy was analyzed using TG-DSC. The results show that the Al in the Mg-Al alloy powder can be completely transformed to AlN. Ignition temperature of the alloy is about 494.4℃. Once the alloy powder is ignited, self-sustained combustion in the powder can be observed. When combustion begins, Mg can rapidly vaporize and react with oxygen. This oxidation reaction can consume the oxygen around the particles, leading N₂ diffusing to the liquid Al layer. Combustion products of the alloy consist of two different layers.The upper white layer contains only MgO and the lower black layer contains only AlN. During synthetic process, the existence of Mg significantly promotes the nitridation of Al.

Key words: AlN, Mg-Al alloy, combustion

CLC Number:

TQ174

Xiao XIE, Yin SUI, Xiao-Yu HUANG, Chen-Guang ZHU. Synthesis of AlN by Direct Combustion of Mg-Al Alloy Powder[J]. Journal of Inorganic Materials, 2019, 34(4): 439-443.

Figures/Tables 8

Table 1 Main instruments used in the test and their manufactures

Instrument	Model	Manufacture
Laser fineness gage	BT-9300H	Bettersize
Scanning Electron Microscope(SEM)	JEOLJSM 6500F	JEOL
Thermogravimetric Analysis and Differential Scanning Calorimeter(TG-DSC)	STA449F3	NETZSCH
X-ray Diffractometer (XRD)	D8	Bruker
High-speed camera	MotionXtra HG-100K	READLAKE

Fig. 1 Analysis of the Mg-Al alloy powder (a) XRD pattern; (b) Size distribution; (c) SEM image; (d) Magnified area in (c)

Fig. 2 TG-DSC curves for Mg-Al alloy heated in air

Fig. 3 Combustion process of Mg-Al alloy in air recorded by a high-speed camera

Fig. 4 Combustion products of Mg-Al alloy particles burned in air

Fig. 5 XRD patterns of the combustion products of the Mg-Al alloy particles in air (a) Upper white oxide; (b) Lower black material

Fig. 6 SEM images of AlN particles (a) and AlN whiskers (b) formed when the Mg-Al alloy powder was burned in air

Fig. 7 Synthetic mechanism of AlN by direct combustion of Mg-Al alloy in air

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