Carbothermal synthesis of high-aspect-ratio AlN whiskers using graphite felt as carbon source

Xu, Huarui; Wan, Shiqin; Kang, Weiwei; Zhao, Jialiang; Han, Sumei; Peng, Dongyao; Yang, Pan; Wang, Qi

doi:10.1016/j.ceramint.2021.12.186

Cited by 8 publications

(4 citation statements)

References 25 publications

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“…Figure 11A shows the scanning results of XPS measurement in the range of 0–1200‐eV binding energy, and the elements of Al, N, C, and O can be detected. Due to the extremely easy oxidation of the AlN surface, the presence of oxygen element was inevitable in the AlN powders, which is consistent with the previous report 33,34 . The data of Mn 2p corresponding binding energy is shown in Figure 11B.…”

Section: Resultssupporting

confidence: 90%

“…Due to the extremely easy oxidation of the AlN surface, the presence of oxygen element was inevitable in the AlN powders, which is consistent with the previous report. 33,34 The data of Mn 2p corresponding binding energy is shown in Figure 11B. The peak at 640.6 eV belongs to Mn 2p 3/2 , with a satellite peak at 647.5 eV, whereas the peak at 653.9 eV is caused by Mn 2p 1/2 .…”

Section: Effects Of Mn 2+ Concentrationmentioning

confidence: 99%

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Synthesis and luminescence properties of red‐emitting AlN:Mn²⁺ spherical phosphors

Chen

et al. 2022

J Am Ceram Soc.

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In this study, we successfully prepared red‐emitting AlN:Mn2+ spherical phosphors by using nitrogen pressure–assisted carbothermal reduction–nitridation method. The optimum preparation parameters were explored by changing nitrogen pressure, CaF2 content, reaction temperature, and the amount of MnCO3. It was confirmed that uniform spherical shape, large particle size, less impurity content, and suitable Mn2+ concentrations could effectively enhance the luminous intensity of AlN:Mn2+ phosphors. The structural compositions of the AlN:Mn2+ phosphors were characterized by X‐ray diffraction and X‐ray photoelectron spectroscopy, indicating that Mn2+ ions were successfully doped into AlN lattice by substitution of Al3+ ions, thus providing the red‐emitting luminescence centers. Based on the experimental results, we further proposed the underlying growth mechanism of spherical AlN phosphors. It was suggested that an adequate amount of liquid Ca‐aluminates was essential to achieve uniform spherical morphology and high fluorescence efficiency.

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Section: Resultssupporting

confidence: 90%

Section: Effects Of Mn 2+ Concentrationmentioning

confidence: 99%

Synthesis and luminescence properties of red‐emitting AlN:Mn²⁺ spherical phosphors

Chen

et al. 2022

J Am Ceram Soc.

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“…With the continuous progress of electronic technology, chips and electronic devices are moving toward the direction of miniaturization and high power density, which brings a powerful use of functions, but also leads to serious heat dissipation problems [1][2][3]. If the heat generated by the chip cannot be eliminated in time, it will seriously affect the performance, reliability, and service life of electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Thermal Conductivity of Epoxy Composites via Constructing Oriented ZnO Nanowire-Decorated Carbon Fibers Networks

Lin,

Yu,

Sun

et al. 2024

Materials

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With the miniaturization and high integration of electronic devices, high-performance thermally conductive composites have received increasing attention. The construction of hierarchical structures is an effective strategy to reduce interfacial thermal resistance and enhance composite thermal conductivity. In this study, by decorating carbon fibers (CF) with needle-like ZnO nanowires, hierarchical hybrid fillers (CF@ZnO) were rationally designed and synthesized using the hydrothermal method, which was further used to construct oriented aligned filler networks via the simple freeze-casting process. Subsequently, epoxy (EP)-based composites were prepared using the vacuum impregnation method. Compared with the pure CF, the CF@ZnO hybrid fillers led to a significant increase in thermal conductivity, which was mainly due to the fact that the ZnO nanowires could act as bridging links between CF to increase more thermally conductive pathways, which in turn reduced interfacial thermal resistance. In addition, the introduction of CF@ZnO fillers was also beneficial in improving the thermal stability of the EP-based composites, which was favorable for practical thermal management applications.

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“…In order to achieve this aim, two main strategies have been reported. The first one is to promote the directional arrangement of fillers to build an orderly thermal conductive network using several special methods, such as hot pressing [13][14][15], casting molding [16], ice-template [17][18][19][20], vacuum filtration [21][22][23], electrospinning [24][25][26], etc. Among them, the ice-template method is extremely suitable for the preparation of the TIMs, which benefits from its low processing shrinkage, controllable porosity and superior mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Oriented Three-Dimensional Skeletons Assembled by Si3N4 Nanowires/AlN Particles as Fillers for Improving Thermal Conductivity of Epoxy Composites

Wang,

Wan,

Niu

et al. 2023

Polymers

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With the miniaturization of current electronic products, ceramic/polymer composites with excellent thermal conductivity have become of increasing interest. Traditionally, higher filler fractions are required to obtain a high thermal conductivity, but this leads to a decrease in the mechanical properties of the composites and increases the cost. In this study, silicon nitride nanowires (Si3N4NWs) with high aspect ratios were successfully prepared by a modified carbothermal reduction method, which was further combined with AlN particles to prepare the epoxy-based composites. The results showed that the Si3N4NWs were beneficial for constructing a continuous thermal conductive pathway as a connecting bridge. On this basis, an aligned three-dimensional skeleton was constructed by the ice template method, which further favored improving the thermal conductivity of the composites. When the mass fraction of Si3N4NWs added was 1.5 wt% and the mass fraction of AlN was 65 wt%, the composites prepared by ice templates reached a thermal conductivity of 1.64 W·m−1·K−1, which was ~ 720% of the thermal conductivity of the pure EP (0.2 W·m−1·K−1). The enhancement effect of Si3N4NWs and directional filler skeletons on the composite thermal conductivity were further demonstrated through the actual heat transfer process and finite element simulations. Furthermore, the thermal stability and mechanical properties of the composites were also improved by the introduction of Si3N4NWs, suggesting that prepared composites exhibit broad prospects in the field of thermal management.

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Carbothermal synthesis of high-aspect-ratio AlN whiskers using graphite felt as carbon source

Cited by 8 publications

References 25 publications

Synthesis and luminescence properties of red‐emitting AlN:Mn²⁺ spherical phosphors

Synthesis and luminescence properties of red‐emitting AlN:Mn²⁺ spherical phosphors

Enhancing the Thermal Conductivity of Epoxy Composites via Constructing Oriented ZnO Nanowire-Decorated Carbon Fibers Networks

Oriented Three-Dimensional Skeletons Assembled by Si3N4 Nanowires/AlN Particles as Fillers for Improving Thermal Conductivity of Epoxy Composites

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Carbothermal synthesis of high-aspect-ratio AlN whiskers using graphite felt as carbon source

Cited by 8 publications

References 25 publications

Synthesis and luminescence properties of red‐emitting AlN:Mn2+ spherical phosphors

Synthesis and luminescence properties of red‐emitting AlN:Mn2+ spherical phosphors

Enhancing the Thermal Conductivity of Epoxy Composites via Constructing Oriented ZnO Nanowire-Decorated Carbon Fibers Networks

Oriented Three-Dimensional Skeletons Assembled by Si3N4 Nanowires/AlN Particles as Fillers for Improving Thermal Conductivity of Epoxy Composites

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Synthesis and luminescence properties of red‐emitting AlN:Mn²⁺ spherical phosphors

Synthesis and luminescence properties of red‐emitting AlN:Mn²⁺ spherical phosphors