Effects of Al particle size and nitrogen pressure on AlN combustion synthesis

Hiranaka, Ayako; Yi, Xuemei; Saito, Genya; Niu, Jing; Akiyama, Tomohiro

doi:10.1016/j.ceramint.2017.04.170

Cited by 20 publications

(7 citation statements)

References 22 publications

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“…Aluminum nitride (AlN) has high thermal conductivity, high resistance, low dielectric constant, low thermal expansion coefficient, good thermal shock resistance, and corrosion resistance, [1][2][3][4] making it a hot new type of electronic ceramic that is widely used in the fields of heat dissipation packaging materials for high-power chips. [5][6][7][8][9][10] The main preparation method is carbothermal reduction method, which is limited by factors such as difficult uniform mixing of raw materials, high cost of high-temperature calcination and the need for high-purity alumina and carbon black. [11][12][13][14][15][16][17][18][19][20][21] Recently, a new type called low-temperature combination synthesis has been adopted, and the prepared AlN has a small and uniform particle size.…”

Section: Introductionmentioning

confidence: 99%

Preparation of nano‐AlN powder by sol–gel foaming and its sintering properties

Wang

et al. 2023

Int J Applied Ceramic Tech

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Uniformly dispersed nano‐sized aluminum nitride powders were prepared by the sol–gel foaming method using aluminum nitrate as the aluminum source, sucrose as the carbon source, and ammonium chloride as the foaming agent. The effects of ammonium chloride content on the particle size and the sintering properties of aluminum nitride were investigated. The results showed that when the molar ratio of ammonium chloride to aluminum nitrate was .5, the colloidal foams were uniform, large, and fluffy, and amorphous alumina precursors with uniform particles could be prepared. Aluminum nitride powder with a particle size of 22–27 nm can be obtained by calcining these precursors in nitrogen atmosphere at 1400°C for 2 h. At the same time, aluminum nitride bulk material with a relative density of 95% can be obtained by sintering the compact samples in nitrogen atmosphere at 1700°C for 2 h.

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Section: Introductionmentioning

confidence: 99%

Preparation of nano‐AlN powder by sol–gel foaming and its sintering properties

Wang

et al. 2023

Int J Applied Ceramic Tech

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“…chose small particle size aluminum powder with high‐specific surface area as the raw material. The large surface areas of the material enables nitriding process of aluminum powder to take place at medium temperature, which effectively improves the nitridation rate of AlN products 14 . Kameshima et al.…”

Section: Introductionmentioning

confidence: 99%

“…The large surface areas of the material enables nitriding process of aluminum powder to take place at medium temperature, which effectively improves the nitridation rate of AlN products. 14 Kameshima et al studied the yield of aluminum nitride with aluminum powders of different particle sizes as raw materials, and the results showed that the nitridation rate of small size aluminum particles is higher than that of large particles. 15 Qiu et al suspended metal aluminum powder in nitrogen and mixed a small amount of ammonia gas to reduce the product agglomeration.…”

Section: Introductionmentioning

confidence: 99%

Toward homogenous AlN via reaction of Al nanoparticles with N₂ and NH₃: Reactive molecular dynamics simulation

Song

Mei

Xu³

et al. 2021

J Am Ceram Soc.

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In this study, reactive molecular dynamics simulations were implemented to study the initial events in synthesizing AlN via aluminum nanoparticles (ANPs) with N2/NH3. The dissolution and diffusion behavior of N and H atoms in ANPs is elaborated. Without sufficient N2 supply and lower temperatures (below 2000 K), AlN nucleates and grows in an island shape, and the phase separation occurs through N atoms diffusion. The increase in N2 density accelerates the dissolution of N atoms through the nitride film to the core. In the NH3 atmosphere, H atoms generated by the cleavage of NH3 on ANPs surface dominate inward penetration, while N atoms are at a disadvantage in competition. ANPs have a large number of internal stress and form interwoven dislocations in the combustion. The number and distribution of dislocations are affected by temperatures and reaction time. ANPs not only expand in volume but also have local voids generated by hot spots at high temperatures. In the analysis of ANPs/NH3 species, the instability of the N‐H bond causes aluminum‐containing substances to spill out. Furthermore, N2 atmosphere together with a small amount of NH3 can loosen the nitride film and promote the diffusion of N atoms into the ANPs core. A homogeneous AlN could be tuned and fabricated under an optimal ratio of N2/NH3 (∼6:1).

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“…In recent years, magnesium silicon nitride (MgSiN 2 ) has been attracted great interest due to the crystal structure is similar to aluminium nitride (AlN). Compared with AlN, MgSiN 2 is a simple covalent insulator, and shows more excellent mechanical properties than AlN ceramics [1] [2] [3]. MgSiN 2 has many attractive properties such as high thermal conductivity, low dielectric constant, high hardness, high thermal stability, good oxidation resistance (up to 920˚C) and high electrical resistance at room temperature [4] [5].…”

Section: Introductionmentioning

confidence: 99%

Combustion Synthesis of MgSiN<sub>2</sub> Powder at Different Nitrogen Pressures

Zhou¹,

Zhang²,

Li³

et al. 2019

MSCE

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MgSiN 2 powders have been synthesized by combustion synthesis (CS) using Mg and Si 3 N 4 as starting materials at different nitrogen pressures. The CSed powders were then sintered by spark plasma sintering (SPS) to obtain dense bulk MgSiN 2 product. Analysis of the CSed powder using X-ray diffraction (XRD) revealed single-phase MgSiN 2 was obtained by CS method. However, the CSed product can be divided into three distinct parts according to its color. Scanning electron microscopy (SEM) observation revealed the grain size and crystallinity decrease gradually from the center to the outer layer. Some small grains clustered together to form larger particles, and there were a large number of pores among the clusters. The grain size seemed increasing with the increase of nitrogen pressure. The bulk density of CS-SPSed MgSiN 2 was 3.11 g/cm 3 , Vickers hardness was 1673.1 kgf/mm 2 , and thermal diffusivity was 8.718E −2 cm 2 /s.

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Effects of Al particle size and nitrogen pressure on AlN combustion synthesis

Cited by 20 publications

References 22 publications

Preparation of nano‐AlN powder by sol–gel foaming and its sintering properties

Preparation of nano‐AlN powder by sol–gel foaming and its sintering properties

Toward homogenous AlN via reaction of Al nanoparticles with N₂ and NH₃: Reactive molecular dynamics simulation

Combustion Synthesis of MgSiN<sub>2</sub> Powder at Different Nitrogen Pressures

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Effects of Al particle size and nitrogen pressure on AlN combustion synthesis

Cited by 20 publications

References 22 publications

Preparation of nano‐AlN powder by sol–gel foaming and its sintering properties

Preparation of nano‐AlN powder by sol–gel foaming and its sintering properties

Toward homogenous AlN via reaction of Al nanoparticles with N2 and NH3: Reactive molecular dynamics simulation

Combustion Synthesis of MgSiN&lt;sub&gt;2&lt;/sub&gt; Powder at Different Nitrogen Pressures

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Toward homogenous AlN via reaction of Al nanoparticles with N₂ and NH₃: Reactive molecular dynamics simulation

Combustion Synthesis of MgSiN<sub>2</sub> Powder at Different Nitrogen Pressures