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A Noncontact Measurement Technique for the Density and Thermal Expansion Coefficient of Solid and Liquid MaterialsA noncontact measurement technique for the density and the thermal expansion refractory materials in their molten as well as solid phases is presented. This technique is based on the video image processing of a levitated sample. Experiments were performed using the high-temperature electrostatic levitator (HTESL) at the Jet Propulsion Laboratory in which 2-3 mm diameter samples can be levitated, melted, and radiatively cooled in a vacuum. Due to the axisymmetric nature of the molten samples when levitated in the HTESL, a rather simple digital image analysis can be employed to accurately measure the volumetric change as a function of temperature. Density and the thermal expansion coefficient measurements were made on a pure nickel sample to test the accuracy of the technique in the temperature range of 1045-1565 C. The result for the liquid phase density can be expressed by p = 8.848 + (6.730 x 10(exp -4)) x T (degC) g/cu cm within 0.8% accuracy, and the corresponding thermal expansion coefficient can be expressed by Beta=(9.419 x 10(exp -5)) - (7.165 x 10(exp -9) x T (degC)/K within 0.2% accuracy.
Document ID
19990076694
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Chung, Sang K. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Thiessen, David B. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Rhim, Won-Kyu (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Date Acquired
August 19, 2013
Publication Date
September 1, 1996
Publication Information
Publication: Review of Scientific Instruments
Volume: 67
Issue: 9
ISSN: 0034-6748
Subject Category
Inorganic and Physical Chemistry
Distribution Limits
Public
Copyright
Other