Patent ID: 7648598

Claim:
A manufacturing method for an isothermal evaporation casting process, comprising the steps of: (a) raising the temperature of a melting crucible to the melting temperature of magnesium and nickel; (b) melting the magnesium and the nickel into the state of liquid, continuously and averagely stirring the liquid; (c) lowering the temperature of the melting liquid down to the temperature of a two-phase region; (d) maintaining a period of reacting time after the temperature of the two-phase section is reached; (e) re-lowering the temperature of the melting liquid down until that a block material of an alloy of primary Mg 2 Ni and eutectic Mg+Mg 2 Ni is made; (f) removing the block material to another heating furnace for heating to the vaporizing temperature of the magnesium; (g) evaporating the magnesium from the block material by way of the heating furnace continuously heating up; (h) lowering down the temperature of the block material without the magnesium, and gaining the primary Mg 2 Ni and the eutectic Mg 2 Ni, wherein the Mg 2 Ni is a high purified alloy; and wherein in step (g) the heating furnace includes a vapor-guiding apparatus, to control the amount of magnesium vapor to control the residue amount of magnesium in the eutectic Mg+M 2 Ni.