RELATIONSHIP BETWEEN THERMAL SHOCK, YOUNG’S MODULE AND COLD CRUSHING STRENGTH OF REFRACTORY PRODUCTS.

The Thermal Shock, is the temperature variation that undergoes a refractory in the successive cycles of heating – cooling. Thermal shock resistance is evaluated in accordance with the standard norm EN 993-11: 2007 If a refractory material is submitted to a successive thermal shocks, the higher the Thermal Shock is, more properties are gradually lost.

TEIDE REFRACTORY SOLUTIONS, S.L. Has its own Automatic Termal Shock Machine.

The Young’s Module is the relation between the pressure applied to a material and the deformation suffered:

E = P/D or P = E x D (HOOKE’s Law) *E Young’s Module (en gPa) *P Pressure (kg/cm², mPa, etc.) *D Deformation = Difference of longitudinal dimensions before and after applying pressure.

Young’s module measurement according to norm EN 993-11: 2007. Dynamic Young’s Module: Refractory materials are not elastic and do not follow a linear proportion between the effort and the deformation (see graphic below these lines thick line). The most common performance is elastic (dotted line) and even fragile breakage one.

The repetitive Thermal Shock Cycles on a refractory action causes progressive decrease in Young’s module.

Young’s module decreases with shock to the water every 5 up to 30 cycles.

Irregularities in some results owing to water test. After the developed studies and the results obtained, according to tests carried out , TEIDE REFRACTORY SOLUTIONS, S.L., concludes that: The variation method of the Dynamic Young’s Module each x acts, either into the air or water, is shown as valid to evaluate the Thermal Shock Resistance, of such products as the CORDIERITE ones, without need of doing long trials such as those used in traditional methods.