SEDL / STP / STP230-EB / STP45035S

Resistance Measurement of Ceramic-Type Strain-Gage Cements

Pitts, J. W.
National Bureau of Standards, Washington, D. C.

Buzzard, E.
National Bureau of Standards, Washington, D. C.

Moore, D. G.
National Bureau of Standards, Washington, D. C.

Pages: 9    Published: Jan 1958

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Abstract

The resistivities of several commercial strain-gage cements and a number of experimental compositions were measured over the temperature range of 80 to 1800 F. Each cement specimen was placed between two cylindrical metal electrodes, allowed to air-dry, and then cured at 600 F. After curing, the specimen was heated to 1800 F at the rate of 15 F per min. Resistance measurements were made at 25 F intervals with a low-voltage d-c ohmmeter. After the specimen had cooled to room temperature, the breaking strength of the cement bond was evaluated in a bending test. The experimental cements were composed of high-purity, high-resistivity oxides as the bulk material, mixed with various reagents which appeared promising as bonding media. Several compositions were developed which had higher resistivities, in the 1200 to 1800 F temperatures range, than any of the commercial cements tested.