Materials Study for High Pressure Sea Water Hydraulic Tool Motors.
Final rept. Apr-Dec 78,
MECHANICAL TECHNOLOGY INC LATHAM N Y
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The objective of the program was to conduct a comprehensive materials study for a small, compact, positive displacement hydraulic motor which will use pressurized sea water as the working fluid. Gear, vane and piston-type motors were selected for the study. The design analysis of the critical components of each motor type were conducted using a baseline motor size of 10 gpm at 1000 psi and 5.8 input horsepower in order to establish the loading and speed requirements. Based on material requirements, an extensive literature search was conducted of published test data on materials, data relevant to sea water lubricated conditions. In the event that test data on materials was not available, tests were conducted to obtain friction, wear and corrosion data under simulated conditions. Two tests rigs were prepared for the studies, one a continuous sliding tester capable of up to 2000 psi at 1500 fpm, and the other a reciprocating tester capable of up to 1500 psi and 250 fpm average speed. The material combinations tested include plastic-metal, metal-metal and nonmetal-metal categories. Submersion tests in sea water were conducted to study corrosion resistance of selected metals and metal couples. Particularly successful combinations in the materials testings were Torlon 4301 Polyamide-imide with fillers versus Inco 625, and High purity Alumina Versus Plasma sprayed Tungsten Carbide.
- Hydraulic and Pneumatic Equipment