IngentaConnect Thermal Conductivity of a Glass: I. Measurement by the Glass-Meta...

Authors: van der Tempel L.¹; Melis G.P.¹; Brandsma T.C.¹

Source: Glass Physics and Chemistry, Volume 26, Number 6, 12 November 2000 , pp. 606-611(6)

Publisher: MAIK Nauka/Interperiodica

Abstract:

The thermal (phonon) conductivity of glass has been measured by contacting the sample with a metal at a different uniform initial temperature. The subsequent temperature response in the metal is measured by a tiny thermocouple just underneath the (contact) surface. The coefficient of heat penetration lgr rgr c_p follows directly from the fitted asymptotic temperature jump or drop for long times. Division by the separately measured heat capacity rgr c_p yields the thermal conductivity lgr . The conductivity measurement reproducibility was sgr = 3%. The standard deviation between validation measurements and round robin test results on Pyrex glass was sgr = 5.8%, somewhat more than the accuracy sgr = 5.2% of the round robin test results. The measurement method is insensible for slight imperfections of the thermal contact and infrared radiation diffusion (photon conductivity) in a hot glass. The method has been used with minor modifications for solid and molten samples at temperatures of 50–850°C and conductivities of 0.1–25 W/(m K). The thermal (phonon) conductivity of the investigated soda-lime silicate glasses increases slightly ( sim 27–30%) with temperature from ambient up to around the glass transition.

Language: English

Document Type: Regular paper

Affiliations: 1: Philips Research Laboratories, Prof. Holstlaan 4, 5656 AA Eindhoven, the Netherlands

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Thermal Conductivity of a Glass: I. Measurement by the Glass–Metal Contact