A comparison of the thermal decomposition
mechanism of wurtzite AlN and zinc blende AlN

Zhou, Zhiqiang; Chen, Xiumin; Yuan, Yixuan; Shi, Lei; Jiang, Wenlong; Yang, Bin; Xu, Baoqiang; Liu, Dachun

doi:10.1007/s10853-018-2400-7

Cited by 7 publications

(5 citation statements)

References 31 publications

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“…In Figure 4A, the V-shaped groove on the surface of the AlN is edged with precipitated aluminum at a shallow depth, and it can be concluded that the laser causes the AlN to decompose and precipitate solid aluminum, corresponding to Equation (2). Therefore, the width w is related to the ablation threshold of the AlN ceramic, the measurement reference of which is shown as the white line in Figure 4A.…”

Section: Methodsmentioning

confidence: 97%

“…Aluminum nitride (AlN) ceramic has good comprehensive properties such as reliable insulation, low dielectric loss, good mechanical properties, and thermal conductivity. Therefore, this material is regarded as a new generation of high‐performance ceramic material and is widely used as substrate materials for high‐power electronic devices 1–3 . But AlN ceramic needs metallization to form a conductive metal layer.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this material is regarded as a new generation of high-performance ceramic material and is widely used as substrate materials for high-power electronic devices. [1][2][3] Hao Dong is the co-first author.…”

Section: Introductionmentioning

confidence: 99%

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Effect of laser parameters and atmosphere in the structuring of aluminum nitride

Shao

Dong

Zhang

et al. 2022

Int J Applied Ceramic Tech

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The characteristics and formation mechanism of V-shaped groove formed by laser-activated metallization of aluminum nitride (AlN) ceramic under different shielding gas environments of air, nitrogen, and argon are investigated, using a novel analysis way which is based on the intensity distribution of the focused laser beam. It is found that the width of the V-shaped groove is slightly different under different gas environments, and the depth of the V-shaped groove is nearly the same, which means that the energy thresholds required for laser decomposition of AlN ceramic are different in various gas environments: air > nitrogen > argon, and the energy required for laser etching AlN ceramic is the same. It is also found that the nonlinearity in the curves of depth and width versus different machining parameters, which are explained in detail.

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Section: Methodsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Effect of laser parameters and atmosphere in the structuring of aluminum nitride

Shao

Dong

Zhang

et al. 2022

Int J Applied Ceramic Tech

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“…The thermodynamic equilibrium patterns, based on the Gibbs free energy minimization principle, were used to estimate the thermodynamic equilibrium components in the system. This software has been used widely in many fields such as chemistry, chemicals, materials, and environmental protection. − …”

Section: Methodsmentioning

confidence: 99%

Formation and Emission Characteristics of Ammonium Sulfate Aerosols in Flue Gas Downstream of Selective Catalytic Reduction

et al. 2019

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Selective catalytic reduction (SCR) technology has been widely employed in coal-fired power plants (CFPPs) because of its high efficiency in NO x removal. Ammonium sulfate aerosols are the byproducts of the SCR of NO x with NH3, which lead to adverse effects such as air preheater blockage and increased particulate matter emissions. In this study, the formation mechanism and emission characteristics of ammonium sulfate aerosols in the simulated SCR flue gas were investigated by thermodynamic calculations and laboratory-scale experiments. The concentration and the size distribution of particles were monitored online using an electrical low-pressure impactor, and the aerosol samples used for composition analysis were collected using a PM2.5/10 impactor. Thermodynamic results indicate that H2SO4 rather than SO3 is the main reactant in the formation of ammonium sulfate and bisulfate. The experimental results showed that the formation of ammonium sulfate and ammonium bisulfate depends on the initial NH3/SO3 molar ratio. Ammonium bisulfate is the principal product formed in a typical SCR outlet flue gas, and its initial formation temperature ranges from 231–260 °C, calculated as follows: P NH3 P H2SO4 (atm2) = 7.9 × 1013 exp(−234968/RT). The concentration of ammonium sulfates aerosol increased with decreasing temperature. Therefore, the initial formation temperature of ammonium bisulfate was higher than the condensation temperature in the actual air preheater. When the concentration of NH3 was 5 μL/L, the number concentration of ammonium bisulfate aerosol was 5.23 × 106/cm3. The aerosol size of both the NH4HSO4 and the (NH4)2SO4 particles was centered at 0.01–0.1 μm, but the NH4HSO4 particles were larger as they could agglomerate by collision. Compared with SO3, NH3 concentrations had a greater impact on aerosol emissions.

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“…1. Экстраполируя данные [25] по диссоциации нитрида алюминия в область низких давлений, получаем, что при давлении 7,73•10 -4 Па темпера-Рис. 3.…”

Section: обсуждение результатовunclassified

MAX phase Ti2AlN synthesis by reactive sintering in vacuum

Linde

Kondakov

Studenikin

et al. 2022

Izv. VUZ. Poroshk. Met.

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The synthesis of MAX phase Ti2AlN from several mixtures of Ti, Al, TiN, and AlN powders by vacuum sintering of greensamples in the form of dense compacts, bulk powder in silica tubes, and plain layer in a closed rectangular molybdenum boat was studied upon variation in charge composition and sintering temperature Ts. The sintering of 2 : 1 Ti–AlN mixture was carried out at 1100, 1200, 1300, 1400, and 1500 °С with exposure time of 60 min. The largest MAX phase content (94 wt.%) was reached at Ts = 1400 °С. The sintering of 1 : 1 TiAl : TiN composition at the same temperature gave 93 wt.% Ti2AlN. The best result (singlephase Ti2AlN in a 100-% yield) was achieved upon the sintering of 1 : 1 : 1 Ti–Al–TiN composition at Ts = 1400 °С. The scalability of our process was checked by the fabrication of a large (0.5 kg) and uniform cake of single-phase Ti2AlN. In experiments we used green samples with shielded lateral surface (bulk powder in silica tubes, plain layer in a closed molybdenum boat) and without shield (dense compacts). It has been shown that shielding of Ti–Al–TiN samples restricts the escape of Al vapor from a sintered mixture, thus providing more favorable conditions for the synthesis of single-phase Ti2AlN. Our process can be readily recommended for practical implementation.

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A comparison of the thermal decomposition mechanism of wurtzite AlN and zinc blende AlN

Cited by 7 publications

References 31 publications

Effect of laser parameters and atmosphere in the structuring of aluminum nitride

Effect of laser parameters and atmosphere in the structuring of aluminum nitride

Formation and Emission Characteristics of Ammonium Sulfate Aerosols in Flue Gas Downstream of Selective Catalytic Reduction

MAX phase Ti2AlN synthesis by reactive sintering in vacuum

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