FIZIKA A 13 (2004) 1 , 23-32

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STUDY OF HIGH DENSITY PLASMA SPRAY PARAMETERS USING PLASMA COAXIAL ACCELERATOR

H. A. EL-GAMALa, M. A. HASSOUBAb, H. A. EL-TAYEBa and M. ABDUL-MONAMEb

aPlasma Department, Nuclear Research Center, Atomic Energy Authority, Egypt
bPhysics Department, Faculty of Science, Benha University, Egypt

Received 16 December 2003;   revised manuscript received 29 March 2004
Accepted 13 December 2004            Online 2 February 2005

Plasma accelerator was used for the deposition of a material powder placed at a breach. A capacitor bank of 46.26 mF charged to 3 kV (208.17 J) gave a peak current of 8.8 kA after 15 ms. Plasma inductance varied between 3 mH and 1.5 mH while the plasma resistance varied between 5 mW and 300 mW within one shot, while the electron temperature and plasma density near the substrate measured with a double electric probe was about 3 eV and 2.7 1013 cm-3, respectively. Carbon plasma velocity at the muzzle was 6.0 cm/ms which agrees with calculations. The deposited graphite powder showed mostly a homogeneous distribution of clusters. The total efficiency of the system, considering both the internal and kinetic energy, was found to be 10.9 %.

PACS numbers: 52.75.Rx, 68.55.-a
UDC 537.525

Keywords: coaxial plasma accelerator, deposition of graphite powder

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