Friction Measurements in Piston-Cylinder Apparatus Using Quartz ⇆ Coesite Transition
The configuration for a high-pressure apparatus is generally a cylinder that is closed at one end and has a movable piston in the other. A specimen to be pressurized is placed inside the cylinder and is compressed by a piston, which is driven by the ram of a hydraulic press. A number of high-pressure apparatuses are in use for static high-pressure and high-temperature studies to 6.5 GPa and 2073 K. Of these, the end-loaded piston-cylinder apparatus has the simplest geometric configuration for directly measuring the pressure inside the cylinder. The pressure in the cylindrical WC pressure Chamber is the product of the pressure on the ram driving the piston into the Chamber and the ratio of the ram cross-section area to that of the piston. This pressure inside the cylinder is uncorrected for friction and is the nominal pressure. The basic apparatus is described by Boyd and England .
KeywordsHysteresis Loop Transition Pressure Friction Measurement Compression Cycle Nominal Pressure
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