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Super-Ni/NiCr laminated composite was successfully joined with Ti-6Al-4V by vacuum diffusion bonding at 950 °C temperature. Results show that the bonding interface was composed of sequentially Ni3Ti, NiTi and NiTi2 layers. The interfacial phase constituents were similar although the joints were obtained with different bonding time. But the bonding time had a significant effect on the interfacial microstructure...
The study aims to investigate the effects of vacuum thermal cycling on carbon/carbon (C/C) composites used in aerospace under simulated low earth orbit (LEO) environmental conditions. The C/C composites were tested at the temperature range from −120 °C to 120 °C for 100 cycles under the high-vacuum state of 1.3x10−3Pa, the composites were characterized through the assessment of the thermal physical...
The paper presents numerical simulation of electron gun of traveling-wave tube (TWT). New emission model for the simulation of electron gun limited by space charge has been developed and implemented in the program TWT Gun Simulation and Design (TGSD), which is a new two-dimensional finite-element code developed in MATLAB, for the simulation and design of axially symmetric electron guns of TWTs. The...
A compact Faraday cup reported in this paper is designed to investigate the current distributions of the electron beams of Traveling Wave Tube’s guns. It consists of a 0.06 mm thick molybdenum aperture plate and a copper shield with a graphite collector inside. There are plates with different laser-cut aperture holes that were 100 μm, 50 μm, 20 μm and 10 μm in diameter for measuring electron beams...
In this paper, polymethylmetacrylate (PMMA) films are modified using an atmospheric pressure non-thermal plasma generated by a dielectric barrier discharge (DBD) in air. The DBD is generated in a plane-parallel reactor, which is driven by a μs pulse power supply with amplitude of up to 25 kV and repetition rate of 1 kHz, and the plasma generated shows homogeneous mode discharge characteristics verified...
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