· Aleaciones ligeras ·
Li Dayong, Shi Dequan, Wang Lihua and Zhang Yutong
Harbin University of Science and Technology, P.R.China
67th World Foundry Congress
Inoculation is a necessary step to produce high quality eutectic Al-Si alloy
castings. Thermal analysis and metallographic observation methods have
been being used to evaluate inoculation result of eutectic Al-Si alloy in real
production, however they are unable to meet the requirement of real time
monitoring in front of furnace because of their relative long measuring
period. The authors put forward a new method to evaluate inoculation
result of eutectic Al-Si alloy based on melt surface tension quick
measurement. To blow the inert gas at appropriate speed into the melt
through a capillary and form bubbles in the melt continuously. Then to test
the pressure change in the bubbles and the melt temperature in 5 seconds
duration with a computerised data acquisition device and to calculate the
number and differential pressure of bubbles. The melt surface tension is
calculated based on the number and the differential pressure of bubbles
and some other parameters. Finally, the inoculation result of eutectic Al-Si
alloy can be given by the device according to calculated melt surface
tension.
