Effects of pressure and temperature on the effective thermal conductivity of oriented silicon steel iron core under atmospheric condition

A set of experimental devices was designed and built to investigate the effects of average temperature of lamination, contact pressure, and lamination number on the effective axial thermal conductivity of silicon steel multi-stacked material in the loading and unloading processes under atmospheric environment. Specimens are stacked by oriented silicon steel sheets, the content of silicon is approximately 3.3%, and thickness is 0.23 mm. Average temperature is in the range of 200-800 °C, and contact pressure is between 0.16 and 16.68 MPa. Experimental results indicated that: effective axial thermal conductivity presented an obvious relationship with the average temperature and contact pressure of lamination but showed independence from the lamination number. Effective axial thermal conductivity is more sensitive to contact pressure in the loading process than in the unloading process. The correlation equations of effective axial thermal conductivity have an accuracy of 15%.