High Temperature Sensors and Arrays for Turbomachines
Final rept. 1 Sep 96-31 Aug 97
VATELL CORP CHRISTIANSBURG VA
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The objective of this program was to create an apparatus and method for laser chemical vapor deposition LCVD of sensors in vacuum under control of a multi-axis positioning system. The system will be used to deposit sensors directly on the curved surfaces of turbine blades, which are insulated beforehand with a sputtered layer of alumina, 20 to 40 microns thick. This system embodies several departures from conventional LCVD. A continuous laser is employed instead of a pulsed laser, to improve the consistency and rate of deposition. The evaporation chamber is inside the vacuum chamber and closely coupled to the nozzle which floods the laser focal point. The entire vapor path is heated, with the objective of improving the speed and efficiency of vapor conversion to deposited metal. Unconverted vapor is scavenged by a carrier flow of inert gas before it can enter the main chamber.
- Test Facilities, Equipment and Methods