Structural, thermal and dielectric properties of AlN–SiC composites fabricated by plasma activated sintering

Li, P. W.; Wang, C. B.; Liu, H. X.; Shen, Qiang; Zhang, L. M.

doi:10.1080/17436753.2019.1580471

Cited by 11 publications

(5 citation statements)

References 42 publications

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“…In comparison with other AlN-based attenuating ceramics, the thermal properties of AlN-based composites containing different attenuating agents are tabulated in Table 1. Generally, the λ values of the SG/AlN composites are significantly higher than that of AlN/SiC attenuating composite ceramics (40 to 70 W•m -1 •K -1 [1,10,11]) at the same content of the second phase. Simultaneously, in comparison to the AlN-based composites containing 1D/2D carbon materials, such as graphene and carbon nanotubes, as the second phase www.springer.com/journal/40145 This work [7][8][9], at the same content, the SG/AlN composite shows a relatively higher λ as well.…”

Section: Thermal Propertiesmentioning

confidence: 90%

“…However, the addition of SiC not only increases the heterogeneous interface, but also generates a SiC/AlN solid solution. As a result, the SiC/AlN composites develop a large interface, high thermal resistance, and numerous crystal defects, which would cause severe phonon scattering and the deterioration of thermal conductivity of the SiC/AlN composite attenuating ceramics [1,10,11].…”

Section: Introduction mentioning

confidence: 99%

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High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent

et al. 2021

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High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite (SG) as the attenuating agent were fabricated through hot-pressing sintering. The SG maintains its three-dimensional (3D) morphology within the sintered bodies, which considerably impedes the sintering of the composites to some extent but slightly influences on the growth of AlN grains. The addition of SG reduces the strength of the composites, but provides a moderate toughening effect at the optimal addition amount (3.8 MPa·m1/2 at 4 wt% SG). Benefiting from the low anisotropy, high thermal conductivity, and the 3D morphology of SG, the composites exhibit a relatively higher thermal conductivity (76.82 W·m−1·K−1 at 10 wt% SG) compared with composites added with non-spherical attenuating agent. The dielectric constant and loss (8.2–12.4 GHz) increase remarkably as the amount of SG added increases up to 8 wt%, revealing that the incorporation of SG improves the dielectric property of the composite. The composite with 7 wt% SG exhibits the best absorption performance with a minimum reflection loss of −13.9 dB at 12.4 GHz and an effective absorbing bandwidth of 0.87 GHz. The excellent overall properties of the SG/AlN microwave attenuating composites render them as a promising material for various applications. Moreover, SG has a great potential as an attenuating agent for microwave attenuating composites due to its strong attenuation upon integration, high thermal conductivity, and low anisotropy.

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Section: Thermal Propertiesmentioning

confidence: 90%

Section: Introduction mentioning

confidence: 99%

High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent

et al. 2021

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“…The rapid development of vacuum electronic devices operating in extreme environments [3] requires microwave attenuation materials to have high thermal conductivity, fine grain structure, and mechanical strength, in addition to excellent microwave absorption capability. All these are necessary to prevent damage to electronic devices operating in corrosive environments [4]. Of all the known composite materials that meet the stated requirements, beryllium oxide [5] is the most promising due to its outstanding characteristics such as high thermal conductivity, good mechanical properties, high temperature stability, and moderate dielectric constant [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Investigation of Properties of Beryllium Ceramics Modified with Titanium Dioxide Nanoparticles

Pavlov,

Sagdoldina,

Zhilkashinova

et al. 2023

Materials

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Samples of beryllium ceramics, with the addition of micro- and nanoparticles TiO2, have been obtained by the method of thermoplastic slip casting. The microstructure of batch ceramics, consisting of micropowders and ceramics with TiO2 nanoparticles sintered at an elevated temperature, has been investigated. It was found that the introduction of TiO2 nanoparticles leads to changes in the mechanisms of mass transfer and microstructure formation, and the mobility of TiO2 at interfacial grain boundaries increases, which leads to the formation of elements of a zonal shell structure. The reduction of intergranular boundaries leads to an increase in density, hardness, and mechanical strength of ceramics. The whole complex of properties of the synthesized material, with the addition of TiO2 nanoparticles in the amount of 1.0–1.5 wt.%, leads to an increase in the ability to absorb electromagnetic radiation in the frequency range of electric current 8.2–12.4 GHz. The analysis and updating of knowledge on synthesis, and the investigation of properties of beryllium ceramics modified by nanoparticles, seems to be significant. The obtained results can be used in the creation of absorbers of scattered microwave radiation based on (BeO + TiO2) ceramics.

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“…The RL value of 7 wt% sample significantly decreases with the increasing frequency in the X-band, and it shows the best absorption performance with a RLmin value of -14 dB at 12.4 GHz. In comparison, the SiC/AlN composites prepared by Li et al[11] exhibited a optimized absorption ability with the…”

mentioning

confidence: 96%

High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent

Xia

Jiang

Pan

et al. 2020

Preprint

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High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite (SG) as the attenuating agent were fabricated through hot-pressing sintering. The SG maintains its three-dimensional morphology within the sintered bodies, which considerably impedes the sintering of the composites to some extent but slightly influences on the growth of AlN grains. The addition of SG reduces the strength of the composites, but provides a moderate toughening effect at the optimal addition amount (3.8 MPa·m 1/2 at 4 wt% SG). Benefiting from the low anisotropy, high thermal conductivity, and the three-dimensional morphology of SG, the composites exhibit a relatively higher thermal conductivity (76.82 W·m -1 ·k -1 at 10 wt% SG) compared with composites added with non-spherical attenuating agent. The dielectric constant and loss (8.2–12.4 GHz) increase remarkably as the amount of SG added increases up to 8 wt%, revealing that the incorporation of SG improves the dielectric property of the composite. The composite with 7 wt% SG exhibits the best absorption performance with a minimum reflection loss of -14 dB at 12.4 GHz and an effective absorbing bandwidth of 0.87 GHz. The excellent overall properties of the SG/AlN microwave attenuating composites render them as a promising material for various applications. Moreover, SG has a great potential as an attenuating agent for microwave attenuating composites due to its strong attenuation upon integration, high thermal conductivity, and low anisotropy.

show abstract

Structural, thermal and dielectric properties of AlN–SiC composites fabricated by plasma activated sintering

Cited by 11 publications

References 42 publications

High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent

High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent

Synthesis and Investigation of Properties of Beryllium Ceramics Modified with Titanium Dioxide Nanoparticles

High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent

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