Volume 05 - Surface Engineering Part 10 ppsx

Metallurgical factors Anodizing Conditions. Fig. 8 Effect of anodizing conditions on specular reflectance of chemically brightened aluminum. Data are for a 5 μm (0.2 mil) anodic coating on 5457 alloy. (a) 17 wt% H 2 SO 4 . (b) 8.8 wt% H 2 SO 4 Thermal Radiation. Fig. 9 Effect of anodic coating thickness on reflectance of infrared radiation. Temperature of infrared radiation source, 900 °C (1650 °F). : 99.99% Al. •: 99.50% Al. Courtesy of Aluminum Development Council Fig. 10 Comparison of absorptance of blackbody radiation by anodized aluminum and polished aluminum. Temperature of aluminum surface. 530 °R (21 °C, or 70 °F) Fatigue Strength. Anodizing Non-Aluminum Substrates Magnesium Anodizing. Titanium Anodizing. Zinc Anodizing. Thermal Spray Coatings Robert C. Tucker, Jr., Praxair Surface Technologies, Inc. Introduction Fig. 1 Deformation of molten or semimolten particles resulting from spray impacting on a substrate Fig. 2 Typical microstructure of a plasma- sprayed tungsten metal coating showing the splat structure and the fine crystalline structure within the splats. (a) Scanning electron micrograph of a fracture surface. (b) Light micrograph of the same coating. Courtesy of Praxair Surface Technologies, Inc. Acknowledgements Metals Handbook, Processes Flame spray Fig. 3 Cross sections of typical flame spray guns. (a) Wire or rod. (b) Powder Flame spray and fuse The electric-arc (wire-arc) spray Fig. 4 Typical electric-arc spray device Plasma Spray. [...]... Courtesy of Praxair Surface Technologies, Inc Fig 6 Typical inert-atmosphere and/or low-pressure plasma chamber Courtesy of Metco, Inc The transferred plasma-arc process Fig 7 Transferred plasma-arc spraying High-Velocity Oxyfuel Fig 8 High-velocity oxyfuel process Courtesy of Praxair Surface Technologies, Inc Detonation Gun Fig 9 Detonation gun process Courtesy of Praxair Surface Technologies,... Equipment In thermal CVD, Fig 1 Thermal CVD reactor Plasma CVD Fig 2 Radio-frequency plasma CVD reactor configured for deposition on silicon wafers Fig 3 Microwave/electron cyclotron resonance (ECR) plasma CVD reactor Laser CVD Thermal-laser CVD (Ref 12), Fig 4 Thermal-laser CVD growth mechanism In photo-laser CVD, Fig 5 Photo-laser CVD apparatus ... Radiation Coating Structures and Properties Coating Microstructures Fig 11 Microstructure of plasma-sprayed chromium oxide As-polished Fig 12 Microstructure of detonation gun deposited alumina and titania As-polished Fig 13 Microstructure of a detonation gun deposited tungsten carbide/cobalt cermet coating (a) As-polished (b) Etched Fig 14 Microstructure of a mechanically mixed chromium carbide/nickel chromium... Fig 9 Detonation gun process Courtesy of Praxair Surface Technologies, Inc Process Comparison Ancillary Equipment Surface Preparation Cleaning and Degreasing Surface Roughening Finishing Treatment Sealing Coating Finishing μ μ μ R μ R Fig 10 Recommended shapes for carbide and high-speed steel cutting tools used in machining sprayed metal coatings Coating Repair Quality Assurance Metallography μ . electric-arc (wire-arc) spray Fig. 4 Typical electric-arc spray device Plasma Spray. Fig. 5 Plasma spray process. Courtesy of Praxair Surface Technologies, Inc. Fig. 6 Typical inert-atmosphere. inert-atmosphere and/or low-pressure plasma chamber. Courtesy of Metco, Inc. The transferred plasma-arc process Fig. 7 Transferred plasma-arc spraying High-Velocity Oxyfuel. Fig. 8 High-velocity oxyfuel. Fig. 10 Comparison of absorptance of blackbody radiation by anodized aluminum and polished aluminum. Temperature of aluminum surface. 530 °R (21 °C, or 70 °F) Fatigue Strength. Anodizing Non-Aluminum