Standard Test Method for Quantitatively Measuring the Effect of Thermal Shock and Thermal Cycling on Refractories

Importancia y uso:

3.1 This test method indicates the ability of a refractory product to withstand the stress generated by sudden changes in temperature.

3.2 Because the recommended furnace temperature of this cycling test is 1200 °C (2190 °F), this test method may not indicate the ability of a refractory product to withstand cycling at higher or lower temperatures, especially if the existing morphology of the refractory product changes.

3.3 This test method is useful for research and development, as well as for comparing refractory products. The precision should be considered when using this test for specification purposes.

3.4 Ruggedness tests found the following variables to be rugged:

Temperature

+5 °C

Hot spacing

¹/₂ to ³/₄ in. (12.77 to 19 mm)

Cold spacing

¹/₂ to ³/₄ in. (12.77 to 19 mm)

Center versus end gripping of the bars

Hot hold time

10 to 15 min

Cold hold time

10 to 15 min

Operator air speed

0 to 2 mi/h (0 to 3.2 km/h)

Initially cold or heated samples

Last in, first out (LIFO); or first in, first out (FIFO)
 removal from the furnace

Sawed or original surface as tensile face during MOR testing

Bar thickness

0.96 to 1.04 in. (24.5 to 26.4 mm)

Subcomité:

C08.02

Volúmen:

15.01

Número ICS:

17.200.10 (Heat. Calorimetry), 81.080 (Refractories)

Palabras clave:

modulus of rupture; refractories; sonic velocity; thermal cycling;