Transcript Studying the Effect of E.S.D. upon Surface Properties for

Electro-spark deposition technique is to release in high
frequency between metal electrode and base material.
Ionization taken place between metal electrode and
base material generates a channel, which, brings about
high-pressure micro areas as well as instant high
temperature on the surface of base material; Meanwhile,
micro electric field make ionic-state electrode material
infiltrate into the base material, resulting in metallurgical
combination. Electro-spark deposition technique is an
instant process converting from high temperature to
refrigeration; It is not welding, or coating, or element
infiltration, simply speaking, it is intervenient.
Studying change in surface metallurgical
properties and its effect on corrosion and wear
resistance by applying E.S.D. process.
• Understanding how conversion electrical power to perfect sparking
properties to accomplish the ESD principles.
• Buildup an electronically-controlled system to manage the process
variables (Voltage , Current , electrical capacitance , Spark duration ,
contact pressure and relative motion speed between electrode and
substrate).
• Beginning work with DC supply then switch to national amplitude current
(50Hz) which has zero mean voltage. After that adding the capacitor to the
circuit.
• Select base metal like turbine blades used in generators in power stations
and fixing degradation causes (corrosion , erosion and cracking . . . etc.)
• Depending on the above cases electrode alloy will be selected (usually
superalloys).
• Increasing the deposition rate and improving its quality depend on the
process variables which determined during work.
Start
Electrical Variables
Metallurgical Variables
Construct The E.S.D. Machine
Fixing Electrical Variables
Deposition Process
Testing and Optimizing
End
Select Materials