Characterization and Optimization of Vacuum-arc Plasma Generator for Nanocomposite Tribological Coating Growth

摘要

This report results from a contract tasking Kharkov Institute of Physics and Technology as follows: Development of new plasma deposition methods is critical for nanocomposite and nanostructured material growth. For example, to address the issues of ambient/space cycling, high-temperature lubrication, and reliability of space and air vehicles, new advanced coatings were developed by AFRL which need a combination of ceramic matrices and solid lubricant inclusions. This research project is directed to develop and optimize power supply for filtered vacuum arc generator located at AFRL/MLBT to enable the production of such unique composite coatings. In particular, the new power unit will provide a stable plasma filtering and delivery into synthesis chamber under conditions of strong magnetic fields for dielectric material growth. The commercially available technology is not capable of such task, due to a lack of understanding and control of the power supply current-voltage characteristics for non-metallic ionic current and density distributions in the arc plasma. This research project will tap the unique expertise of Ukrainian scientists in filtered vacuum arc technology, which was invented in Dr. Strelnitskiy's group. AFRL is currently evaluating the technology benefits for various tribological applications in both air and space vehicles. The new development suggested by this project will expand the range of materials to include insulating ceramic matrices, such as AL2O3 and ZrO2, for preparation of nanocomposite and nanostructured tribological coatings. This will provide a new capability for AFRL research in advanced wear and friction reducing coatings for aerospace. The project includes transfer of the research results, developed equipment, and technological procedures for the use in AFRL/MLBT research and development programs.