ALUMINA COATINGS ON GRAPHITE RODS. STATEMENT OF WORK DEPOSITION OF ALUMINA ON GRAPHITE RODS BY ELECTRON-BEA…

Public award description

ALUMINA COATINGS ON GRAPHITE RODS. STATEMENT OF WORK DEPOSITION OF ALUMINA ON GRAPHITE RODS BY ELECTRON-BEAM, PHYSICAL VAPOR DEPOSITION BACKGROUND: THESE COATINGS ARE TO BE USED AS A CERAMIC SLEEVE OVER THERMOELECTRIC MATERIALS TO REDUCE SUBLIMATION. DENSE COATINGS WITH LOW AMOUNTS OF INTERCONNECTED POROSITY ARE REQUIRED. THE VENDOR SHALL DEPOSIT ALUMINA (AL2O3) COATINGS BY ELECTRON-BEAM, PHYSICAL VAPOR DEPOSITION (EB-PVD) ONTO 0.25 INCH GRAPHITE RODS. ION ASSIST DURING EB-PVD COATING DEPOSITION SHALL BE USED TO HELP DENSIFY THE COATINGS. THE DEPOSITED COATING THICKNESS SHALL BE BETWEEN 100 AND 110 MICRONS. THE COATED LENGTH OF THE RODS SHALL BE IN EXCESS OF 5 INCHES. TWO COATING OPTIONS ARE REQUIRED. (1) ONE ROD IS TO BE COATED USING THE REQUIREMENTS STATED ABOVE (100-110 MICRONS THICK, ION ASSISTED, 5 INCH MINIMUM COATED LENGTH). (2) ONE ROD IS TO BE COATED AS ABOVE BUT WITH THE ADDITIONAL CONDITION THAT IT BE THERMALLY COOLED A MINIMUM OF 20 TIMES DURING THE DEPOSITION PROCESS IN ORDER TO RENUCLEATE GRAINS IN THE COATING AND BREAK UP THE COLUMNAR GRAINS RESULTING FROM TRADITIONAL EB-PVD. THREE 6 INCH GRAPHITE RODS SHALL BE SUPPLIED AS SUBSTRATES TO THE VENDOR.