STP1136: Evaluating the Accuracy of Thermomechanical Analysis Expansion Coefficient Measurements in a Wide Temperature Range

    Matsumori, N
    Technical engineering manager and application chemist, Seiko Instruments U.S.A., Inc., Torrance, CA

    Penn, J
    Technical engineering manager and application chemist, Seiko Instruments U.S.A., Inc., Torrance, CA

    Nakamura, N
    R & D supervisor and general manager, Seiko Instruments, Inc., Tokyo,

    Teramoto, Y
    R & D supervisor and general manager, Seiko Instruments, Inc., Tokyo,

    Pages: 17    Published: Jan 1991


    Abstract

    The determination of the thermal expansion coefficient by thermomechanical analysis (TMA) is based on the measurement of the original length of the specimen, the expansion difference between the specimen and the holder material (reference material), and the specimen temperature. When the measurement error is considered, the first possible error is in the measurement of the temperature, and the second is in the measurement of the expansion difference. The error in the expansion difference is not significant for high expansion materials, such as polymers, but it is significant for low expansion materials such as ceramics. For material with a low thermal expansion, three corrections are available to reduce measurement errors for improved accuracy in the linear thermal expansion coefficient determinations.

    Keywords:

    thermomechanical analysis (TMA), expansion coefficient (CTE), temperature sensor, linear vassriable differential transformer (LVDT), low expansion material, accuracy, correction, heating rate


    Paper ID: STP23590S

    Committee/Subcommittee: E37.01

    DOI: 10.1520/STP23590S


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