Effect of film thickness on the temperature dependence of thermal conductivity for diamond/BeO composites

Luo, Hao; Wei, Qiuping; Yu, Zhaoju; Wang, Yijia; Long, Hangyu; Xie, Youneng

doi:10.1016/j.ceramint.2015.06.020

Cited by 14 publications

(1 citation statement)

References 39 publications

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“…The thermal conductivity of diamond-based composites has been reported in the literature [12]. However, no diamond-based composites are reported as microwave absorptive materials, probably because of the high electrical conductivity of these materials [13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Ablation on Microwave Attenuation Properties of Diamond Films

Ding

Liu

et al. 2019

Materials

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Thermal conductivity is required for developing high-power microwave technology. Diamond has the highest thermal conductivity in nature. In this study, a diamond film was synthesized by microwave plasma chemical deposition, and then long and short conductive graphite fibers were introduced to the diamond films by laser ablation. The permittivity of the samples in the K-band was measured using the transmission/reflection method. The permittivity of diamond films with short graphite fibers increased. The increase in real part of permittivity can be attributed to electron polarization, and the increase in the imaginary part can be ascribed to both polarization and electrical conductivity. The diamond films with long graphite fibers exhibited a highly pronounced anisotropy for microwave. The calculation of microwave absorption shows that reflection loss values exceeding −10 dB can be obtained in the frequency range of 21.3–23.5 GHz when the graphite fiber length is 0.7 mm and the sample thickness is 2.5 mm. Therefore, diamond films can be developed into a microwave attenuation material with extremely high thermal conductivity.

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Section: Introductionmentioning

confidence: 99%