Measurement of heat flux at metal/mould interface during casting solidification

In the present study, heat transfer at the metal/mould interfaces is investigated using a sensor for the direct measurement of heat flux. The heat flux sensor (HFS) was rated for 700°C and had a time response of less than 10 ms. Casting experiments were conducted using graphite moulds for aluminium alloy A356. Several casting experiments were performed using a graphite coating and a boron nitride coating. The measurement errors were estimated. The temperature of the mould surface was provided by the HFS whereas the temperature of the casting surface was measured using a thermocouple. Results for the heat transfer coefficients were obtained based on measured heat flux and temperatures. Four stages were clearly identified for the variation in time of the heat flux. Values of the heat transfer coefficient were in good agreement with data from previous studies.