Influence of the Concentration and Type of Additives on the Structure and Electromagnetic Properties of AlN-Based Composites

IF 0.9 4区 材料科学 Q3 MATERIALS SCIENCE, CERAMICS Powder Metallurgy and Metal Ceramics Pub Date : 2025-01-22 DOI:10.1007/s11106-025-00451-x
T. B. Serbeniuk, T. O. Prikhna, G. A. Baglyuk, O. A. Kalenyuk, S. I. Futimsky, A. P. Shapovalov, V. B. Sverdun, M. V. Karpets, V. E. Moshchil, O. L. Kasatkin, Bernd Büchner, Robert Kluge, A. A. Marchenko
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Abstract

The electromagnetic characteristics, particularly the real εr′ and imaginary εr″ parts of the dielectric constant, of new AlN-based composites with additions of powdered diamond, soot, and diamond with 3–5 wt.% molybdenum, synthesized by hot pressing, were studied at frequencies ranging from 12.4 to 18 GHz. Structural features and key phases of the composites—AlN, C (graphite), Al3(O, N)4, Al, and Mo2C (in the AlN–Y2O3–C (diamond)–Mo system)—were determined by X-ray diffraction. Scanning electron microscopy with energy-dispersive X-ray analysis for determining the quantitative elemental composition of the key phases revealed a low oxygen content in the AlN lattice. Measurements of the electromagnetic characteristics showed that the new composites with graphite phase inclusions had stable dielectric characteristics over the entire frequency range (εr′ = 12.38–33.03 and tgδ = 0.009–0.214). The introduction of 3% diamond powder to the AlN-based charge hardly increased the εr′ and tgδ values (12.3 and 0.009, respectively). When a 5% : 5% mixture of diamond and molybdenum powders was added, the dielectric constant εr′ reached 17.04 and tgδ was 0.067. Composites with 5% soot demonstrated the highest dielectric constant (33.03) and dielectric losses (0.214). Thus, the dielectric constant was found to be increased through specific phase composition of the materials and dispersed distribution of conductive phases (C, Mo2C) within the composites with minimal contacts between them.

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Powder Metallurgy and Metal Ceramics
Powder Metallurgy and Metal Ceramics 工程技术-材料科学:硅酸盐
CiteScore
1.90
自引率
20.00%
发文量
43
审稿时长
6-12 weeks
期刊介绍: Powder Metallurgy and Metal Ceramics covers topics of the theory, manufacturing technology, and properties of powder; technology of forming processes; the technology of sintering, heat treatment, and thermo-chemical treatment; properties of sintered materials; and testing methods.
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