Structure, mechanical and functional properties of aluminum nitride-silicon carbide ceramic material

Serbenyuk, Т. B.; Aleksandrova, L. I.; Zaika, M. I.; Ivzhenko, V. V.; Kuz’menko, E. F.; Loshak, M. G.; Marchenko, Alexandr; Prikhna, Т. О.; Sverdun, V. B.; Tkach, S. V.; Boryms’kii, O. I.; Fesenko, I. P.; Chasnyk, V. I.; Wend, M.

doi:10.3103/s106345760806004x

Cited by 12 publications

(3 citation statements)

References 11 publications

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“…This dependence is explained by the fact that when a composite is nonconductive in passing of direct current through it, the absorption of electromagnetic energy in two phase composites always increases with increasing the concentration of particles of the conductive or semiconductive phase to the threshold of percolation [18]. In our previous papers [19,20] the results of the measuring the thermal conductivity and microhardness of composite materials were described. The thermal conductivity increased with increasing SiC concentration to 50 wt % and was within 58-73 W/(m⋅K) and the hardness, H V , values under a load of 150 N varied within 12.5-13.1 GPa.…”

Section: Resultsmentioning

confidence: 99%

Formation regularities of structures of AlN-SiC-based ceramic materials

Prikhna

Serbenyuk

Sverdun

et al. 2015

J. Superhard Mater.

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Composite materials based on AlN-SiC have been produced by the pressureless sintering. It has been established that in the formation of the AlN-SiC-Y 3 Al 5 O 12 structure the yttrium aluminum garnet locates along the boundaries of SiC and AlN grains, thus preventing the mutual dissolution of AlN-SiC. It has been found that the increase of the SiC amount from 20 to 50 wt % results in changes of the a and c parameters of the crystal lattice from 0.49821 to 0.49837 nm and from 0.5046 to 0.498 nm, respec tively, and in increase of the composite absorbing ability from 8.8 to 31.4 dB/cm (at frequencies of 9.5-10.5 GHz).

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Section: Resultsmentioning

confidence: 99%

Formation regularities of structures of AlN-SiC-based ceramic materials

Prikhna

Serbenyuk

Sverdun

et al. 2015

J. Superhard Mater.

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“…One of these materials is ultra-dispersed aluminum nitride powder. Aluminum nitride has high enough thermal conductivity, so its addition to chromium oxide helps increase the thermal conductivity of the tool material in general [46]. In addition, the comprehensive study of dielectric characteristics in wide ranges of frequencies, electrical resistance, and thermal conductivity of AlN-based composites makes these materials promising and competitive [47].…”

Section: The Study Materials and Methodsmentioning

confidence: 99%

Determining the influence of ultra-dispersed aluminum nitride impurities on the structure and physical-mechanical properties of tool ceramics

Gevorkyan

Nerubatskyi

Chyshkala

et al. 2021

EEJET

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This paper considers features related to manufacturing the chromium oxide-based tool material. The process involved ultra-dispersed powders made of aluminum nitride. It has been established that the destruction of chromium oxide at high sintering temperatures is prevented through the reaction sintering of chromium oxide (Cr2O3) and aluminum nitride (AlN). It was established that the structure of the composite depends both on the temperature and the duration of hot pressing. Thermodynamic calculations of the interaction between Cr2O3 and AlN showed that this interaction begins at a temperature of 1,300 °C. In contrast to hot pressing in the air, no СrN and Сr2N compounds were formed in a vacuum. With increasing temperature, the content of Al2O3 in solid solution becomes maximum at a temperature of 1,700 °C in the case of hot pressing in the air while in vacuum the content of Al2O3 remains unchanged within the entire temperature range of 1,300–1,700 °C. When increasing the time of hot pressing to 30 minutes, the size of individual grains reaches 10 μm. It has been shown that in the sintering process involving Cr2O3 and AlN, the plasma-chemical synthesis produces the solid solution (Cr, Al)2O3 at the interphase boundary, which improves the mechanical properties of the material. The influence exerted on the quality of the machined surface of tempered hard steel when machining by the devised tool material based on chromium oxide with an optimal admixture of 15 wt % of ultra-dispersed aluminum nitride powder was investigated. It was determined that the quality of the machined hard steel surface improved compared to standard imported tool plates. It was established that the resulting tool material, in addition to relatively high strength and crack resistance, also demonstrates high thermal conductivity, which favorably affects the quality of the machined steel surface, given that lubricants and coolants are not used during the cutting process.

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“…微波衰减陶瓷被广泛应用于微波电真空器件中, 可以抑制自激振荡、消除有害的电磁模式和增强带宽等, 确保电真空器件处于稳定的工作状态 [1] 。传统的微波衰减陶瓷大都采用氧化铝和氧化铍作为基体, 通过添加不同的衰减相制备而成, 随着大功率微波电真空器件的发展以及人们对环境问题的关注, 这类微波衰减陶瓷由于热导率低和有毒等不足而逐渐被限制使用 [2] 。目前, 兼具高导热和良好衰减性能的微波衰减陶瓷已经成为研究的焦点。氮化铝具有高热导率 [3] 、适中的介电系数、良好的化学和热稳定性以及很高的电阻率, 适合作为微波衰减陶瓷的基体相。常见的研究体系主要分为两类: 一类是 AlN-金属体系, 如 AlN-Mo [4] 、AlN-W [5][6] 复相陶瓷, 通过添加金属颗粒作为衰减相来提高材料的微波衰减能力, 但是由于金属和陶瓷密度相差大, 分散困难, 局部会出现金属颗粒连通的情况, 材料的绝缘性能难以控制; 另一类是 AlN-陶瓷体系, 常见的是 AlN-SiC [7] 陶瓷体系。虽然该体系具有优异的微波衰减性能, 但是由于固溶引起热导率下降, 使其在大功率器件中的应用受到限制, 如 Serbenyuk 等 [8] 制备的 AlN-SiC 陶瓷, 热导率只有 37~82 W/(m•K)。研究发现, 碳材料也是一种优良的微波衰减相, 一些学者通过添加石墨或者炭黑研究了 AlN-C 复相陶瓷, 发现该体系既具有良好的微波衰减性能 [9][10]…”

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In situ Pyrolyzed Carbon on the Property of AlN-based Microwave Attenuation Ceramics

He¹,

Li²,

Zhang³

et al. 2018

Journal of Inorganic Materials

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Carbon materials exhibit excellent microwave absorbing properties. However, it is difficult to disperse carbon homogeneously in the ceramic substrate. In this study, carbon was introduced into AlN matrix by addition of phenolic resin followed by pyrolysis process. The effects of phenolic resin content on sintering behavior, microstructure, thermal conductivity and dielectric properties of AlN ceramics were investigated. It was found that phenolic resin derived carbon could effectively promote the densification of AlN ceramics and reduce the sintering temperature. Relative density of the AlN ceramics reached 99.26% after sintering at 1700℃ with addition of 3wt% phenolic resin. In addition, it was found that the presence of phenolic resin derived carbon can effectively improve the thermal conductivity of the ceramics. The dielectric properties were also improved due to the carbon films formed in the pores and at AlN grain boundaries. With addition of 6wt% phenolic resin, AlN ceramics showed high thermal conductivity of 135.1 W/(mK) and excellent microwave attenuation properties (the dielectric loss was 0.3 at X-band), which were perspective candidates for possible applications in high power microwave vacuum electron devices.

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Structure, mechanical and functional properties of aluminum nitride-silicon carbide ceramic material

Cited by 12 publications

References 11 publications

Formation regularities of structures of AlN-SiC-based ceramic materials

Formation regularities of structures of AlN-SiC-based ceramic materials

Determining the influence of ultra-dispersed aluminum nitride impurities on the structure and physical-mechanical properties of tool ceramics

In situ Pyrolyzed Carbon on the Property of AlN-based Microwave Attenuation Ceramics

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