电火花表面沉积技术

On Electro-park Surface Deposition

电火花沉积工艺(ESD)是一种脉冲微弧焊工艺,用高电流的短脉冲把电极材料沉积到基体金属表面,微量的电极材料在脉冲等离子弧的作用下熔化并在基体表面快速固化形成涂层,涂层与基体表面材料呈冶金结合。电火花沉积工艺不仅可以用来填充零件的破损区域,还可以用在表面涂层。对于修复,大部分可以在现场进行,而且只需很短的时间。电火花涂层适合用于高应力、高温、易磨损、易腐蚀等的恶劣的环境下。文中对该工艺的原理、优点、缺点以及研究的热点进行了详细介绍。

Electro-spark deposition （ESD） is a pulsed-arc micro-welding process, using short duration, high-current electrical pulses to deposit a consumable electrode material onto a metallic substrate. Micro-volumes of electrode materials are deposit in the arc plasma of a pulsed current and fused into the substrate surface and solidified rapidly forming a metallurgical bond. Electro-Spark Deposition can be used to repair a damaged area and perform surface enhancement as a coating. Most major repairs can be carried out on site in a very short time. The ESD coatings are particularly suitable in severe environments involving high stresses, high temperature, wear, corrosion and erosion. The principles, advantages, drawbacks and research projects of the ESD process are described in detail.