The carbon nanotube (CNT) is a promising reinforcement material for manufacturing
metal-or ceramic-based composites. However, CNTs are prone to interact with the matrix
in a reactive atmosphere that often alters the structure and properties of CNTs and
depresses their reinforcing effect. To overcome this problem, a protective silicon layer
has been deposited on multi-walled carbon nanotubes (MWNTs) using cycled
vacuum-feeding chemical vapour deposition by the in situ decomposition of gaseous
SiH4. The silicon coating is well covered and continuous with a cubic-phase structure. It
effectively improves the thermal stability of MWNTs by acting as a protective film,
which inhibits and delays the onset of oxidation. Thermogravimetric analysis
(TGA) reveals that the oxidation of Si-coated MWNTs occurs at a temperature of
676.3 °C, which
is 105.1 °C
higher than that of uncoated MWNTs, and the weight loss decreases with the increasing
thickness of silicon coating.
The black-nickel film on the flat type radiometer chip was investigated, and a black-nickel film which can be applied in this chip was prepared using electroplating method. The analyses of absorption of radiometer chip indicated that the absorption rate of the chip is proportional to the surface roughness. The black-nickel film was prepared and tested, and surface morphology testing showed that this film has microstructures of the scale 50 nm—1.5 μm. Infrared absorption measurement indicated that the absorptivity of the film in the 1.4—8 μm range is higher than 0.989. This high absorptivity black-nickel film improves the performance of the chip.
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