Formation of Surface Alloys With a Low-Energy High-Current Electron Beam for Improving High-Voltage Hold-Off of Copper Electrodes

2015

Mechanics & Industry

-The alloying of surfaces of tool materials by wide-aperture low-energy high-current electron beam before wear-resistant coating is developed. This technology makes possible to enlarge a lifetime of cutting tools. The regularities of high-melting compounds formation in the near-surface layer are established. The high-melting compounds are obtained by reaction of self-spreading high-temperature synthesis. The microstructure of modified surface layers is investigated by optical microscopy.

Section: Methodology Of Researchmentioning

confidence: 81%

Tool material surface alloying by wide-aperture low-energy high-current electron beam treatment before wear-resistant coating

Grigoriev

2015

Mechanics & Industry

“…The unit enables deposition of films on the surface of the desired product and subsequent liquid-phase mixing of materials of the film and the substrate by an intense pulse electron beam [39,40]. The LEHCEB generation includes the emission of electrons, the formation of the beam in a plasma-filled diode, and the transportation thereof in a plasma channel [41,42]. The adoption of such generation scheme makes it possible to obtain a beam having a microsecond duration (about 5 ms) with a current density of 10 5 A/cm 2 , at an accelerating voltage of 15-30 kW [43].…”

Section: Methodsmentioning

confidence: 99%

Comprehensive surface treatment of high-speed steel tool

Aleshin

Swe

et al. 2017

Mechanics & Industry

Abstract. One of the promising directions of hardening of high-speed steel tool is the creation on their surface of the layered structures with the gradient of physic-chemical properties between the wear-resistant coatings to the base material. Among the methods of such surface modification, a special process takes place based on the use of pulsed high-intensity charged particle beams. The high speed of heating and cooling allows structural-phase transformations in the surface layer, which cannot be realized in a stationary mode. The treatment was conducted in a RITM-SP unit, which constitutes a combination of a source of low-energy high-current electron beams "RITM" and two magnetron spraying systems on a single vacuum chamber. The unit enables deposition of films on the surface of the desired product and subsequent liquid-phase mixing of materials of the film and the substrate by an intense pulse electron beam. The article discusses features of the structure of the subsurface layer of high-speed steel M2, modified by surface alloying of a low-energy high-current electron beam, and its effect on the wear resistance of the tool when dry cutting hard to machine Nickel alloy. A significant decrease of intensity of wear of high-speed steel with combined treatment happens due to the displacement of the zone of wear and decrease the radius of rounding of the cutting edge because of changes in conditions of interaction with the material being treated.

“…The unit makes it possible to deposit films of various materials on the surface of an article with subsequent liquid-phase mixing of the materials of the film and of the substrate by an intense electron beam [13]. The manifested phase boundary between the film and the substrate is smeared yielding an extended transition layer with a thickness of several microns and variable composition of components [14].…”

Section: Methods Of Studymentioning

confidence: 99%

Special Features of Electron-Beam Alloying of Replaceable Polyhedral Hard-Alloy Plates Under a Complex Surface Treatment

Oganyan

2016

Met Sci Heat Treat

Thermochemical treatment of a hard alloy is implemented by alloying its surface with the help of a low-energy strong-current electron beam prior to depositing a wear-resistant coating. The method increases substantially the service life of the tool. The laws of formation of refractory compounds in the surface layer due to initiation of a reaction of self-propagating high-temperature synthesis in the mode of thermal explosion are determined. The change in the wear behavior of the modified tools is studied.