Present Situation of Measuring Method and Standardization for Thermal Properties of Structural Ceramics.
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概要
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The method for measurements of the thermal conductivity of refractories, insulating bricks and structural ceramics, and these standardization in the world were reviewed briefly, relating progress in materials and techniques to the developments in the high temperature industry.The thermal conductivity of refractories was measured by a panel method which operates with the specimen under a temperature gradient simulating service conditions in the U.S. In 1947, the method was adopted as ASTM C-182, C-201, and C-202. Recently, a transient hot wire (THW) method was adopted as ASTM C-1113.In Germany, the Didier Research Institute for DIN committee (DRI) selected the THW method as DIN 51046.There exist the BS 2973 and BS 1902 using a modified ASTM method in the Great Britain. The THW method was tested at British Ceramic Research Association (BCRA).In France, There isn't standard test method. The Paris institute of the Société Francaise de Céramique (SFC) has compared différent methods such as ASTM, a radial flux and the THW method. After SFC, BCRA and DRI agreed that the THW method (DIN 51046) was to be recommended to the International Organization for standrdization and the THW method was adopeded as ISO 8894-1 in 1987 and 8894-2 (parallel method) in 1990.In Japan, the ASTM method with reduced test specimen for insulating bricks has been issued as JIS R 2616 in 1959. The apparatus for measuring thermal conductivity of insulating bricks by the THW method was adopted as JIS R 2618, and improved in 1991. There is no standard test method for refractories bricks yet, because it is very difficult to select any method for thermal conductivity measurements of high conductive bricks. In 1991, a laser frash method was adopeted as JIS R 1611 for measuring the thermal conductivity of structural fine ceramics.
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