The vacuum low-pressure EPC（expandable pattern casting）is a newly developed casting technique

which combines the advantages of EPC with low pressure casting process

exhibiting the features of stable filling

high accuracy and solidification under pressure.The fluidity of magnesium alloy in vacuum low-pressure EPC and the effects of pouring temperature

coating thickness and gas flux on the fluidity have been investigated

and the optimized processing parameters have been provided.The results show that the fluidity of magnesium can be greatly improved in vacuum low-pressure EPC

moreover

it is increased with increasing gas flux and decreasing coating thickness.The optimized parameters is as follows:gas flux of 3

5

m3/h

pouring temperature at 750

7

80 ℃

coating thickness of 0.3

0

.5 mm

pattern materials density of 0.16 mg/cm3

vacuum rate less than 0.03 MPa.