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1

Characterization and Application of Al/Ni Reactive Multilayers in Exploding Foils

Wang T., Zeng Q., Li M.

Central European Journal of Energetic Materials

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2017

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Vol. 14, no. 3

547--558

EN

A self-propagating reaction achieved by initiating an Al/Ni reactive multilayer foil can generate significant heat. The interdiffusion rate of the reactants plays an important role in the foils properties and is mainly affected by premixing and the bilayer thickness. The present research aims to characterize Al/Ni multilayer foils and to investigate their influence on an exploding foil initiator. Samples with different bilayer thicknesses were fabricated by magnetron sputtering. The heat released and the flame velocity were characterized. Foils with a stored energy of about 1100 J/g were prepared and the heat released revealed the existence of a 4 nm premixing layer. The analytical model proposed by Mann was employed to match the measured flame velocities; the fitted model showed good agreement with the experimental results. To make a comparison, Cu and Al/Ni exploding foils with the same bridge size were fabricated and tested in the identical discharge circuit. The results showed that the energy deposition ratio of an Al/Ni foil was 67-69%, while the value for Cu was only 39-45%, which indicated that Al/Ni multilayers could effectively increase the energy utilization of an initiator. Larger average flyer velocities were also observed with the Al/Ni initiators.

2

Friction and Wear Behavior of 201HT Cast Aluminum Alloy with Various Competitive Material

Li R., Chen L. J., Su M., Zeng Q., Li H., Liu Y.

Archives of Foundry Engineering

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2017

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Vol. 17, iss. 2

55--62

EN

The friction and wear properties of 201HT aluminum alloys and the corresponding competitive coupons were tested on an electro-hydraulic servo face friction and wear testing machine (MM-U10G). The microstructures of the competitive coupons were investigated by scanning electron microscopy (SEM) and consequently the corresponding friction and wear mechanisms were studied. The results demonstrated that: (1) the best competitive material of friction and wear performance of the 201HT was the 201HTC. (2) the 201HTC modified by carbon following the initial mill for oil storage of the micro-groove to be produced, increased the corresponding lubrication performance reduced the friction coefficient and wear rate effectively. (3) the 201HT-201HTC could obtain both better friction and wear mainly due to the initial process of grinding following the 201HT plastic deformation occurred in the surface and the formation of a series of re-melting welding points, whereas the 201HT material hardness would be similar to the 201HTC material hardness, which led into the competitive material friction and wear performance improvement.

3

Luminescence of Bismuth, cerium and Terbium in Alkaline Earth Borates

Xie Y., Zhang S., Zeng Q.

Polish Journal of Chemistry

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2004

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Vol. 78 / nr 10

1885-1892

EN

The luminescence of Bi3+, Ce3+ and Tb3+ -activated BaB8O13 and Sr-borates are studied. The emission peak of Ce3+ in alkaline earth borates shifts to higher energy side with decreasing ratio of SrO/B2O3. The energy transfer from Ce3+ to Tb3+ in BaB8O13is studied.