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Simplified Expansion Dilatometer

IP.com Disclosure Number: IPCOM000081867D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Narken, B: AUTHOR

Abstract

Expansion measurements on solids are usually done with (quartz) differential dilatometers. Two reasons which limit the precision and accuracy of the dilatometer method are the mass of the dilatometer itself and support structure, together with the method of heating and cooling.

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Simplified Expansion Dilatometer

Expansion measurements on solids are usually done with (quartz) differential dilatometers. Two reasons which limit the precision and accuracy of the dilatometer method are the mass of the dilatometer itself and support structure, together with the method of heating and cooling.

The dilatometer assembly shown in the figure consists of an outer quartz tube 1 (with 5 mm O.D. and 3 mm I.D.) and an inner quartz tube 2 (with 3 mm O.D. and 1 mm I.D.). The inner tube 2 should fit snugly into the outer tube 1 and be able to slide freely. The bottom of the outer tube is closed with quartz plug 3 having a square end, and then fused to the outer tube. The bottom of the inner tube 2 should be closed by fusing, then made flat and square by grinding.

The temperature of the sample 4 is sensed by a thermocouple 5 inserted through the hole in the inner quartz tube and contacting the bottom of the tube. The sample elongation or contraction is sensed by a linear voltage differential transformer (LVDT) transducer 6 mounted on the upper end of the quartz tube. The transformer 7 is mounted on the outer tube 1 and the core element 8 is mounted on the inner tube.

The temperature-containing medium consists of a metallic or refractory fine- grain powder 9, through which a gas flows, as shown by the arrows, to produce a fluidized bed mechanism. The temperature of the fluidized bed 10 is controlled by heating the gas which flows through it. Because of the flu...