tailieunhanh - Gas Turbine Engineering Handbook 2 Episode 10

Tham khảo tài liệu 'gas turbine engineering handbook 2 episode 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Materials 435 Another area of research is the development of techniques to ensure that the application of the coatings are extremely even. The external deposition source can be electron beam vapor deposition sputtering plasma spray cladding or any number of other techniques. The technique for application of overlay coatings which appears to have the most promise is high-velocity plasma. For this technique powder particles of the desired coating composition are accelerated through a plasma field to velocities as high as three times the speed of sound. The impact of the powder onto the workpiece results in a much stronger bond between the coating and workpiece than can be achieved by using conventional subsonic plasma spray deposition. In addition much higher coating densities can be achieved using the high-velocity plasma. One company has developed and patented a detonation gun to use for coating application. Basically the gun detonates a metered mixture of oxygen acetylene and particles of the desired coating material and throws them at supersonic velocities at the workpiece surface. The workpiece itself remains at quite low temperatures so its metallurgical properties are not modified. Bibliography Bernstein . High Temperature Coatings for Industrial Gas Turbine Users Proceedings of the 28th Turbomachinery Symposium Texas A M University p. 179 1999. Bernstien . Materials Issues for Users of Gas Turbines Proceedings of the 27th Texas A M Turbomachinery Symposium 1998 . Lavoie R. and McMordie . Measuring Surface Finish of Compressor Airfoils Protected by Environmentally Resistant Coatings 30th Annual Aerospace Airline Plating and Metal Finishing Forum April 1994. McMordie . Impact of Smooth Coatings on the Efficiency of Modern Turbomachinery 2000 Aerospace Airline Plating Metal Finishing Forum Cincinnati Ohio March 2000. Schilke . Advanced Gas Turbine Materials and Coatings 39th GE Turbine State-of the-Art Technology Seminar August 1996. Warnes . .