Research On HCPEB Discharge Characteristics And Surface Alloying Irradiation Process Of GCr15by HCPEB

High current pulsed electron beam (HCPEB) with features of instantaneousheating effect, short time（μs）with energy irradiation, rapid cooling which can makea difference on the surface morphology, composition, phase, and materialsperformance. This technology has become a promising research in surfacemodification treatment by the past20years. In this paper，the strength of HCPEBhas been understood through a whole package from development of equipment tomaterials performance. By using high-power pulsed power technology，a pulsedhigh voltage power has been made which can apply a high negative voltage tocathode emission source in order to obtain103A electron beam. Hard films TiN,TiAlN are irradiated by HCPEB, while the optimal irradiation technology toimprove the coating friction and wear properties and adhesion strength has beenstudied.The output power of Marx high voltage discharge power can reach107W,Pulsepeak output voltage and current are magnified about2.5times in terms with inputones. The increase of number copper wire in each emmission unit in cathode canstimulate greater current of electron beam. Limiting resistance, electron beam outputstability, current limiting resistor should be maintained at between50~100Ω toensure stable cathode potential. By adjusting the electron beam emission systemparameters we can achieve the effect of changing the electron beam. Without plasmaimproving the vacuum environment, increasing the number of capacitors andemission unit we can obtain greater maximum electron beam current is measuredwith3410A, the main current conversion rate of45.3percent, which is a highefficiency in energy utilization.In this paper, the preparation of hard films TiN on GCr15is made by PIII&D,and TiAlN coating is made by same way but with composite cathode containing Alelements. Irradiation process can bring changes in surface morphology, surfacealloying on coating. By increasing the number of irradiation and the degree ofvacuum, the alloying with substrate and coating is greater, forming FeTi, FeNcompounds. TiN, TiAlN coatings are irradiated (low degree of vacuum,20times),then microcracks on both sides of scratches can be eliminated, and signal intensityhas decreased. The amount of Al contained6.8%of the TiAlN coating effect is mostobvious, can completely eliminate the coating brittle cracking load, indicating thatunder appropriate irradiation treatment process, can ease the stress between the coating and the substrate to improve adhesion strength. Finally, we explored theoptimal irradiation process in terms with friction and wear properties. TiN optim umirradiation is irradiated at low vacuum of20times,and we can get stable frictioncoefficient of0.45, the wear scar width is reduced6.6%,60.6%decrease in wearscar width; TiAlN in Al containing an amount of3.5%under the conditions of highvacuum of20times were irradiated with the best performance, the frictioncoefficient of0.4,47.3%decrease in wear scar width,59.1%decrease in wear scarwidth; compared to the original coating the properties of coating with irradiation arelargely enhanced, which is the material surface alloying and enhance adhesionstrength is closely related.