Micro-nano Structure On The Surface Of The Saterial To Suppress Strong Electricity Research On Vacuum Breakdown Of Magnetic Field

RBWO occupies an important position in high-power microwave generating devices,mainly due to its high power,high efficiency,and good service performance in a re-frequency working environment.However,pulse shortening severely reduces the energy of a single microwave pulse,which greatly limits the development of high-power microwaves.Studies have shown that the main cause of pulse shortening is the vacuum breakdown of the strong electromagnetic field,and the vacuum breakdown of the strong electromagnetic field is closely related to the electronic physical properties of the material surface vacuum,especially the grain refinement and the reduction of the material surface roughness can effectively suppress the strong electromagnetic field vacuum Breakdown,based on this,this paper conducts the Surface nanocrystallization treatment of titanium material to carry out the research of its strong electromagnetic field vacuum breakdown characteristics:(1)Ultrasonic Peening and micro-particle shot peening were used to treat the surface of titanium material with self-nanoization,and the metallographic structure,surface roughness,grain size,etc.were characterized and analyzed.The results showed that the self-nano-treatment The crystal grains of the titanium material are refined,and the surface crystal grain size is about 40 nm in size.The surface layer of the material appears obvious plastic deformation,forming a micron-level gradient nanostructure,and the surface roughness is reduced to less than 0.15?m.(2)Through experiments such as field electron emission,cathode lead emission,high current electron beam targeting,etc.,the electron emission performance,resistance to electron bombardment performance of titanium materials before and after the surface self-nano treatment were compared.performance.The field electron emission test results show that the industrial pure titanium TA2 treated by ultrasonic peening technology is basically considered to have no electron emission under the test conditions in this article;the cathode lead emission experiment results show that the ultrasonic peening treatment of the titanium material lead corresponds to the tube The head marks are the smallest;these two results indicate that the ultrasonic peening shows that the treatment can effectively suppress the electron emission of the titanium material.Targeting experiment results show that after ultrasonic peening surface treatment,the damage depth of the electron beam has a tendency to further decrease,indicating that the ultrasonic peening surface treatment improves the electron beam bombardment resistance of TA2 material to a certain extent.(3)The breakdown of the slow-wave structure was carried out.The results showed that the breakdown on the slow-wave structure was mainly concentrated in the strong field area,that is,the area near a small radius;the breakdown traces on the slow-wave structure were mainly divided into "small pits" and " There are two types of "microcracks",but the damage marks caused by electron emission and electron bombardment are different in the microscopic view.After the surface treatment of TA2 industrial pure titanium by ultrasonic peening,its resistance to strong electromagnetic field vacuum breakdown characteristics and the performance of titanium alloys are basically quite.Based on theoretical analysis,this paper carries out experiments such as surface nano-treatment and strong electromagnetic field vacuum breakdown.It is concluded that the ultrasonic peening technology can effectively suppress the vacuum breakdown of titanium materials with strong electromagnetic field,which is the follow-up strong electromagnetic field vacuum breakdown.The research provides a certain reference.