Some characteristics of fine beryllium particle combustion

Давыдов, Д. А.; Kholopova, O.V.; Kolbasov, B.N.

doi:10.1016/j.jnucmat.2007.03.199

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…Механическое измельчение сопровождается разогревом и поверхностным окислением порошков. Оксид бериллия, находясь на поверхности частиц порошка, наследуется границами зерен компактного спеченного бериллия, выполняя роль дисперсно-упрочняющей фазы [1][2][3][4][5][6]. Указанная фаза существенно влияет на процессы структурообразования и формирование прочностных и пластических свойств спеченного бериллия.…”

Section: введение введениеunclassified

Characteristics of granule solidification in gas atomization of molten beryllium

Syrnev,

Pestova,

Semilutskaya

et al. 2023

Izv. VUZ. Poroshk. Met.

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Experimental and analytical studies on gas atomization of the molten beryllium and the production of beryllium granules are presented. The impact of various factors, including the choice of gas (nitrogen or helium), the cooling gas flow rate (ranging from 300 to 650 m/s), melt temperature, and droplet size (<500 µm), on the cooling rate and granule properties, is demonstrated. It has been determined that the solidification of beryllium granules can occur through two distinct mechanisms depending on the atomization process. These mechanisms include crystallization and amorphization (glass transition). When beryllium melt is atomized with nitrogen, granules with diameters less than 100 µm solidify via the amorphization mechanism (glass transition), while those with diameters exceeding 300 µm solidify through crystallization. In such cases, a portion of granules with sizes ranging from 100 to 300 µm undergoes a mixed mechanism solidification. In this process, the surface becomes amorphous, while the central part crystallizes, resulting in the formation of a “shell” on the surface, marking the transition from the glass transition mechanism to the crystallization mechanism. The thickness of this “shell” depends on the granule diameter, measuring 10–15 µm for 300 µm granules and 20–25 µm for 100 µm granules. The findings from this research align well with the hypothesis of a glass-crystalline mechanism of beryllium granule solidification, which leads to their separation at the interfacial boundary. Such solidification through a mixed mechanism results in the creation of a removable “crust” on the granule, which is typically more contaminated with impurities. Understanding this effect opens up possibilities for practical applications in the production of specialized materials from beryllium. The ability to separate the “crust” from the “core” provides the conditions for obtaining specialized sintered beryllium grades suitable for use in nuclear reactors and foil production, where a beryllium microstructure with “clean” boundaries is essential.

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Section: введение введениеunclassified

Characteristics of granule solidification in gas atomization of molten beryllium

Syrnev,

Pestova,

Semilutskaya

et al. 2023

Izv. VUZ. Poroshk. Met.

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“…The Be capsule fabricated by anyone or any method is always characterized by a columnar grain with large diameter [33][34][35][36][37] , which is relevant closely to a hcp structure of Be. The lattice constant, a = 0.2286 nm, c = 0.3584 nm, and the ratio c to a is 1.568, which is the lowest in all metals with hcp structure.…”

Section: Progress On Be Grain Refinementmentioning

confidence: 99%

An investigation progress toward Be-based ablator materials for the inertial confinement fusion

Luo

Zhang

et al. 2017

High Pow Laser Sci Eng

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The Be-based materials with many particular properties lead to an important research subject. The investigation progresses in the fabrication technologies are introduced here, including main three kinds of Be-based materials, such as Be-Cu capsule, Be 2 C ablator and high-purity Be material. Compared with the pioneer workgroup on Be-based materials, the differences in Be-Cu target fabrication were described, and a grain refinement technique by an active hydrogen reaction for Be coating was proposed uniquely. Be 2 C coatings were first prepared by the DC reactive magnetron sputtering with a high deposition rate (∼300 nm/h). Pure polycrystalline Be 2 C films with uniform microstructures, smooth surface, high density (∼2.2 g · cm 3 ) and good optical transparency were fabricated. In addition, the high-purity Be materials with metal impurities in a ppm magnitude were fabricated by the pyrolysis of organometallic Be.

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“…With the development of laser inertial confinement fusion (ICF), it is found that the beryllium films not only improve the implosion speed due to their good ablation properties, but also tolerate the larger roughness for the the D-T ice layer and control the Rayleigh-Taylor instability growth. Consequently, Be films are preferred to be used as the ignition target materials for the ICF experiments, [1][2][3][4][5][6][7][8] which is another important application for the beryllium besides serving as the X-ray window material. However, due to the fact that Be material has a poor ductility and large residual stress, it is difficult to fabricate the high quality Be films to meet the target design requirements, which restricts its application in the field of ICF.…”

Section: Introductionmentioning

confidence: 99%

Sputtering pressure influence on growth morphology, surface roughness, and electrical resistivity for strong anisotropy beryllium film

Luo¹,

Li²,

Kang³

et al. 2014

Chinese Phys. B

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Sputtering pressure influence on growth morphology, surface roughness, and electrical resistivity for strong anisotropy beryllium film * Luo Bing-Chi(罗炳池) a)b) , Li Kai(李恺) a)b) , Kang Xiao-Li(康晓丽) a) , Zhang Ji-Qiang(张吉强) a) , He Yu-Dan(何玉丹) a) , Luo Jiang-Shan(罗江山) a) † , Wu Wei-Dong(吴卫东) a)b) , and Tang Yong-Jian(唐永建) a) a) Research Center of Laser Fusion,

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Some characteristics of fine beryllium particle combustion

Cited by 6 publications

References 10 publications

Characteristics of granule solidification in gas atomization of molten beryllium

Characteristics of granule solidification in gas atomization of molten beryllium

An investigation progress toward Be-based ablator materials for the inertial confinement fusion

Sputtering pressure influence on growth morphology, surface roughness, and electrical resistivity for strong anisotropy beryllium film

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