研究目的
Investigating the nonvacuum surfacing of protective coatings using a low-energy electron beam for enhancing resistance to mechanical wear, corrosion, or high temperatures.
研究成果
The study successfully demonstrates the nonvacuum surfacing of protective coatings using a low-energy electron beam, achieving coatings with high microhardness and good heat resistance up to 900°C. The method offers advantages over traditional vacuum and relativistic beam surfacing by eliminating the need for a vacuum chamber and reducing personnel protection requirements.
研究不足
The study is limited by the small free path of low-energy electrons in air, requiring mechanical beam scanning. The process also necessitates protective gas to prevent oxidation, and the coatings' performance is evaluated up to 1100°C.
1：Experimental Design and Method Selection
The study employs a combined method of self-propagating high-temperature synthesis (SHS) and electron-beam surfacing (EBS) for coating deposition. The electron beam is generated by a gun with a plasma emitter and transported to the atmosphere using a differential pumping system.
2：Sample Selection and Data Sources
Coatings are deposited on alloyed 12Kh18N10Т steel substrates using reaction mixtures of TiO2 : 2.1C and TiO2 : 0.3Cr2O3 : 3.3С. The phase composition and properties of the coatings are analyzed.
3：List of Experimental Equipment and Materials
Electron gun with a plasma emitter, industrial robotic manipulator KUKA KR 240 R3200 PA, differential pumping system, muffle furnace SNOL-1.6.2.5.1/11-I3, microhardness testers Duramin and PMT-3, SEM 515, Phaser 2D diffractometer.
4：Experimental Procedures and Operational Workflow
The electron beam is mechanically swept over the substrate surface coated with a composite layer. The process parameters are kept constant, and protective gas (helium) is used to prevent oxidation. The coatings' microhardness and heat resistance are measured after annealing at various temperatures.
5：Data Analysis Methods
Optical and scanning electron microscopy, X-ray diffraction analysis, and microhardness measurements are used to analyze the coatings' structure, phase composition, and properties.
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