Preparation and dielectric properties at high frequency of AlN-based composited ceramic

Zang, Xiangrong; Lu, Yu

doi:10.1007/s10854-019-02826-4

Cited by 17 publications

(8 citation statements)

References 38 publications

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“…A microwave attenuating material is a vacuum electronic material which is crucial in radars, early-warning aircrafts, and microwave measurement systems [1][2][3][4][5][6]. It absorbs electromagnetic waves within specific frequency bands and converts them into heat energy for the inhibition of sideband oscillation, broadening of bandwidth, and improving electromagnetic matching during operations.…”

Section: Introduction mentioning

confidence: 99%

“…As a result of their outstanding characteristics such as high thermal conductivity, good mechanical properties, high-temperature stability, and moderate dielectric constants, ceramic-based composite attenuating materials, such as BeO, MgO, Al 2 O 3 , and AlN matrix composite ceramics, have been one of the extensive application for attenuation materials [1], wherein AlN has been regarded as the most advantageous attenuating ceramic matrix by virtue of its high thermal conductivity (320 W•m -1 •K -1 ), high strength, high insulation, non-toxicity, and low out-gassing under a vacuum environment [1,2]. The preparation of AlN-based microwave attenuating composite ceramics generally involves the introduction of metal conductors (W and Mo), semiconductors (SiC and TiO 2 ), or carbonaceous materials (graphite, carbon black, graphene, and carbon nanotubes) to improve the dielectric loss of the AlN-based composites, and enhance their microwave attenuation [3,4].…”

Section: Introduction mentioning

confidence: 99%

“…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: Introduction mentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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·m1/2 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

“…As a result of their outstanding characteristics such as high thermal conductivity, good mechanical properties, high temperature stability, and moderate dielectric constants, ceramic-based composite attenuating materials, such as BeO, MgO, Al 2 O 3 , and AlN matrix composite ceramics, have been one of the extensively for attenuation materials [1]. Wherein AlN has been regarded as the most advantageous attenuating ceramic matrix by virtue of its high thermal conductivity (320 W•m -1 •K -1 ), high strength, high insulation, non-toxicity and low out-gassing under a vacuum environment [1,2].…”

Section: Introductionmentioning

confidence: 99%

High-thermally Conductive AlN-based Microwave Attenuating Composite Ceramics with Spherical Graphite as Attenuating Agent

Xia

Jiang

Pan

et al. 2020

Preprint

View full text Add to dashboard Cite

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·m1/2 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

Preparation and dielectric properties at high frequency of AlN-based composited ceramic

Cited by 17 publications

References 38 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

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

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