Particle Synthesis in a Pulsed Plasma Arc Device

2001 ◽  
Vol 32 ◽  
pp. 217-218
Author(s):  
C. ARTELT ◽  
W. PEUKERT ◽  
M. ROTT ◽  
H. BOLT
Keyword(s):  
Pulsed Plasma ◽  
Plasma Arc ◽  
Particle Synthesis

scholarly journals Investigation of Microstructure and Mechanical Performance of IN738LC Superalloy Thin Wall Produced by Pulsed Plasma Arc Additive Manufacturing

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 3924
Author(s):  
Kaibo Wang ◽  
Zhe Sun ◽  
Yuxin Liu ◽  
Yaohui Lv
Keyword(s):  
Additive Manufacturing ◽  
Mechanical Performance ◽  
Eutectic Reaction ◽  
Bimodal Distribution ◽  
High Energy ◽  
Thin Wall ◽  
Pulsed Plasma ◽  
Plasma Arc ◽  
Heat Accumulation ◽  
Energy Beam

The IN738LC Ni-based superalloy strengthened by the coherent γ′-Ni3(Al,Ti) intermetallic compound is one of the most employed blade materials in gas turbine engines and IN738LC thin wall components without macro-cracks were fabricated by pulsed plasma arc additive manufacturing (PPAAM), which is more competitive when considering convenience and cost in comparison with other high-energy beam additive manufacturing technologies. The as-fabricated sample exhibited epitaxial growth columnar dendrites along the building direction with discrepant secondary arm spacing due to heat accumulation. A lot of fine γ′ particles with an average size of 81 nm and MC carbides were observed in the interdendritic region. Elemental segregation and γ–γ′ eutectic reaction were analyzed in detail and some MC carbides were confirmed in the reaction L + MC→γ + γ′. After standard heat treatment, bimodal distribution of γ′ phases, including coarse γ′ particles (385 nm, 42 vol.%) and fine γ′ particles (42 nm, 25 vol.%), was observed. The mechanism of microstructural evolution, phase formation, as well as cracking mechanisms were discussed. Microhardness and tensile tests were carried out to investigate the mechanical performance. The results show that both the as-fabricated and heat-treated samples exhibited a higher tensile strength but a slightly lower ductility compared with cast parts.

scholarly journals A Primary Study of Variable Polarity Plasma Arc Welding Using a Pulsed Plasma Gas

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1666 ◽  
Author(s):  
Zhenyang Lu ◽  
Wang Zhang ◽  
Fan Jiang ◽  
Shujun Chen ◽  
Zhaoyang Yan
Keyword(s):  
Arc Welding ◽  
Primary Study ◽  
Plasma Arc Welding ◽  
Pulsed Plasma ◽  
Plasma Arc ◽  
Voltage Fluctuation ◽  
Arc Voltage ◽  
Variable Polarity ◽  
Variable Polarity Plasma Arc ◽  
Arc Voltage Fluctuation

A process variant of variable polarity plasma arc welding (VPPAW), that is, the pulsed plasma gas VPPAW process, was developed. The pulsed plasma gas was transmitted into the variable polarity plasma arc through a high-frequency solenoid valve to modify the output of the plasma arc. The collection of arc electrical characteristics, arc shapes, and weld formation from VPPAW, double-pulsed VPPAW (DP-VPPAW), and pulsed plasma gas VPPAW (PPG-VPPAW) was carried out to examine if the pulsed plasma gas was able to play a positive role in improving the stability and quality of the VPPAW process. The arc voltage shows that the pulsed plasma gas had a greater influence on the electrode positive polarity voltage. The lower the plasma gas frequency was, the lower the arc voltage fluctuation frequency was and the greater the arc voltage fluctuation amplitude was. From the arc image, it could be observed that the arc core length had a short decrease during the general rising trend after plasma gas was turned on. The arc core width only had a slight change due to the restriction of the torch orifice. Compared with pulsed current wave, the pulsed plasma gas could better enhance the fluidity of the molten pool to reduce porosity during aluminum keyhole welding.

TiN coatings generated with a pulsed plasma arc

1996 ◽  
Vol 5 (3) ◽  
pp. 582-587 ◽  
Author(s):  
H Bruzzone ◽  
H Kelly ◽  
A Márquez ◽  
D Lamas ◽  
A Ansaldi ◽  
...  
Keyword(s):  
Pulsed Plasma ◽  
Plasma Arc ◽  
Tin Coatings
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