| Measurement of hot strength is becoming increasingly
significant for refractories. At high temperatures, the
bricks of furnace linings are subjected, mainly, to three
types of stresses, namely tensile, transverse or compressive
stress, and undergo stretching, bending or compression. For
the above purpose, measurements of high temperature tensile,
torsional, transverse and compressive strengths are adopted.
Due to appearance of liquid phases at high temperature,
the strength measurements are complicated and practically
no standardisation in the apparatus nor in the method of
evaluation has been done. In the present investigation attempt
has been made to standardise the high temperature
torsional-creep test by taking into consideration the factors
which cause variation in the result. This method will enable
to measure the apparent viscosity of refractories at high
temperatures, utilizing a torsion testing apparatus. |
