Symmetrical and Unsymmetrical Frictions in Pyrophyllite Medium on High-Temperature Measurement in Piston-Cylinder Type High-Pressure Chamber
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摘要: 本文用测定铅的熔化曲线的方法来研究高温下活塞-圆筒容器中叶蜡石介质的摩擦损耗。发现叶蜡石在高温高压条件下，其不对称摩擦明显增高，因此不能应用常温下的压力定点方法标定压力。这些不对称摩擦很可能来源于叶蜡石在高温和常温状态下具有的较为悬殊的力学性能差别，从而导致了样品组装内部高温区与外层低温区之间负的差载效应。研究认为，叶蜡石具有价廉和易加工等优点，其摩擦在高温下也可大幅度下降。如果对由于压室温度不均匀而带来的不对称摩擦作适当修正，它仍然可以作为该类容器中高温高压物性测量的较为理想的传压介质。Abstract: Frictions in pyrophyllite medium at elevated temperature in piston-cylinder type apparatus are examined by measuring the melting curve of lead. The obtained results show evident unsymmetrical frictions grown out during pressure calibration at higher temperatures. As a result, the widely used fixed points calibration method becomes inapplicable. As temperature differs greatly at the central and outside parts of the assembly, this unsymmetrical friction is assumed to be originated from the corresponding evident disparity in mechanical properties of the medium, showing a large differential loading. We conclude that as the pyrophyllite is very cheap and easy in machining, it should get wide application as a qualified medium in high-temperature high-pressure measurement of physical properties, if the unsymmetrical friction is understand in its nature and if it could be well controlled.
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Key words:
- pressure calibration /
- pyrophyllite medium /
- piston-cylinder apparatus
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