Low-cost high-heat-conduction die-casting magnesium alloy and manufacturing method therefor
AssigneeBaoshan Iron & Steel Co., Ltd.
InventorsShiwei Xu, Jichun Dai, Weineng Tang, Changlong Zhuo, Haomin Jiang, Pijun Zhang
Life of this patent
Estimating the term…
Abstract
A die-casting magnesium alloy. The die-casting magnesium alloy comprises, by mass percent, 1% to 5% of La, 0.5% to 3% of Zn, 0.1% to 2% of Ca, 0.1% to 1% of Mn and the balance Mg and other inevitable impurities. The die-casting magnesium alloy manufacturing method comprises smelting, refinement and die-casting. The die-casting magnesium alloy has good mechanical performance, die-casting performance and heat conduction performance.
Claims10
A heat-conduction die-casting magnesium alloy consisting of by mass,
- La:
- 1 to 5%;
- Zn:
- 2.5 to 3%;
- Ca:
- 0.1 to 2%;
- Mn:
- 0.1 to 1%;
- and
- the balance is Mg and other inevitable impurities;
- wherein the magnesium alloy has a microstructure comprising α-magnesium matrix and precipitation phases, and wherein the α-magnesium matrix comprises fine grains and a small amount of relatively larger grains, and the relatively larger grains have a volume ratio of 20% or less;
- and
- wherein the fine grains have a size of 3-15 μm and the relatively larger grains have a size of 40-100 μm.
A manufacturing method for a heat-conduction die-casting magnesium alloy, comprising the following steps:
- (1) melting pure Mg ingots and pure Zn ingots in a smelting furnace;
- (2) adding Mg—Ca and Mg—Mn master alloys to the smelting furnace and melting them completely;
- (3) adding Mg—La master alloy to the smelting furnace and melting it completely, and adding flux at the same time to cover the surface of a resulting melt;
- (4) refining the melt;
- (5) cooling the refined melt to 630-750° C.;
- and
- (6) die-casting the melt to obtain a heat-conduction die-casting magnesium alloy consisting of by mass:
- La:
- 1 to 5%;
- Zn:
- 2.5 to 3%;
- Ca:
- 0.1 to 2%;
- Mn:
- 0.1 to 1%;
- and
- the balance is Mg and other inevitable impurities;
- wherein the magnesium alloy has a microstructure comprising α-magnesium matrix and precipitation phases, and wherein the α-magnesium matrix comprises fine grains and a small amount of relatively larger grains, and the relatively larger grains have a volume ratio of 20% or less;
- and
- wherein the fine grains have a size of 3-15 μm and the relatively larger grains have a size of 40-100 μm.
Dependencies are inferred from the claim text.