网易能买彩票 www.qjlz.net Nano Composite Structure and Plasma Enhanced Magnetron Sputter (PEMS) Technology
When material particle diameter is less than 100 nano, this kind of material is called nano materials. Nano-scale coating
has excellent hardness, toughness, wear resistance, corrosion resistance and the durability of the whole.
The SwRI is in leading status on nano technology study, such as titanium (TiN) coating which was used for tools inserts,
and diamond-like coating for hard disk of computers which is very thin (less than 10 nm) and of excellent performance.
In addition, SwRI is engaged of TiSiCN coating study, which is a kind of nano composite coatings with both excellent strength and hardness , and greatly enhance the severe situation of particles antiscouring abrasion performance,liquid particle erosion wear, and won't lead to base material fatigue and yield strength of change.
Figure (a) Dense and featureless microstructures Figure(b) Nano-composite coatings
of TiSiCN Nano composite coatings structure schematic diagram
Erosive wear test data from American southwest research institute and Canadian national laboratory
Figure(a) Frictional factor Figure (b) The wear rate of uncoated film Ti-6Al-4V and wear rate of
TiSiCN coatings under the variable coating film process
Using the PEMS deposition technology, the super-hard, extreme thick, wear-resistant and corrosion resistant coatings
can be obtained, which is widely used for gas turbine compressor blades surface enhanced against solid particle erosion
(SPE) and oxidation resistant nozzles for rocket engine. Shown in Figure a is schematic of plasma enhanced magnetron
sputter technology (PEMS), while the Figure b is photograph of sample coating film process. This technology is
based on magnetron sputter deposition, a physical vapor deposition (PVD) process. In conventional magnetron sputter
deposition, the parts are installed inside a vacuum chamber. After the vacuum system is pumped down, gas is fed in, and
when the negative voltage is applied to the magnetron, the plasma is generated. Plasma is defined as the discharging gas
with ions, electrons and excited neutrals. The negatively biased voltage draws ions from the plasma to the target which
is mounted on the magnetron. High energy ions bombard the target surface and result in sputtering of the target material,
which are then deposited on to the surface of the parts.
Figure (a) PEMS system schematic process Figure (b) A photograph of the PEMS