High-strength wear-resisting die-cast aluminum alloy and die casting method for same

A technology for casting aluminum alloy and aluminum alloy, applied in the field of aluminum alloy die-casting, can solve the problems of low strength, split aluminum matrix, aluminum alloy fracture, etc., and achieve the effect of high strength

Active Publication Date: 2018-05-18
佛山市辰辉金属制品厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing Al-Si-Cu die-casting aluminum alloys have excellent die-casting fluidity, wear resistance and machinability, the problems of low strength and poor shaping have become increasingly prominent, which greatly limits the Al-Si-Cu die-casting aluminum alloy. Application of Si-Cu Series Die Casting Aluminum Alloy
[0003] The reason for the low strength and poor plasticity of the existing Al-Si-Cu die-casting aluminum alloys is that the die-casting aluminum alloys contain high Fe content, and Fe is usually in the form of thick needle-shaped Al-Fe-Si The Fe-rich phase exists in the aluminum alloy matrix. This coarse needle-like Fe-rich phase itself is a hard and brittle intermetallic compound phase, which will severely split the aluminum matrix and become the crack source and crack propagation direction of the aluminum alloy fracture.
Secondly, the Al-Si-Cu die-casting aluminum alloy belongs to the hypereutectic aluminum-silicon alloy. Due to the high content of Si, Si coexists in the form of acicular eutectic Si and coarse primary Si in the aluminum alloy. Crystalline Si and coarse primary Si are also hard and brittle phases, which will also severely split the aluminum matrix and reduce the strength, plasticity and wear resistance of aluminum alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Die-cast aluminum alloy is composed of the following components by mass percentage: Si 10.6%, Cu 2.1%, Fe 0.6%, Ti0.1%, Tc0.03%, B 0.006%, Ba 0.04%, Ge 0.02%, the rest is Al and not Avoided impurities, the single content of unavoidable impurities is ≤0.05%, and the total amount of impurities is ≤0.15%. The die casting method of die casting aluminum alloy comprises the following steps:

[0035] The first step: select aluminum ingots with a purity of 99.7%, instant silicon with a purity of 99.9%, and Al50Cu alloys, Al20Fe alloys, Al10Ti alloys, Al5Tc1B alloys, Al5Ba alloys and Al5Ge alloys as raw materials;

[0036] The second step: heating and melting the aluminum ingot at 740°C, adding 10.6% of instant silicon, 4.2% of Al50Cu and 2% of Al20Fe alloy accounting for the total weight of raw materials, stirring and melting to form an aluminum alloy liquid;

[0037] The third step: use 0.5% of the total weight of the raw materials as hexachloroethane to refine and remove the...

Embodiment 2

[0040] Die-casting aluminum alloy is composed of the following components by mass percentage: Si 11.1%, Cu 2.3%, Fe 0.7%, Ti0.2%, Tc0.04%, B 0.008%, Ba 0.05%, Ge 0.025%, the rest is Al and not Avoided impurities, the single content of unavoidable impurities is ≤0.05%, and the total amount of impurities is ≤0.15%. The die casting method of die casting aluminum alloy comprises the following steps:

[0041] The first step: select aluminum ingots with a purity of 99.7%, instant silicon with a purity of 99.9%, and Al50Cu alloys, Al20Fe alloys, Al10Ti alloys, Al5Tc1B alloys, Al5Ba alloys and Al5Ge alloys as raw materials;

[0042] The second step: heating and melting the aluminum ingot at 720°C, adding 11.1% of instant silicon, 4.6% of Al50Cu and 2.5% of Al20Fe alloy accounting for the total weight of raw materials, stirring and melting to form an aluminum alloy liquid;

[0043] The third step: after the aluminum alloy liquid is refined and deslagged with 0.5% of the total weight o...

Embodiment 3

[0046] Die-cast aluminum alloy is composed of the following components by mass percentage: Si 11.4%, Cu 2.4%, Fe 0.8%, Ti0.3%, Tc0.05%, B 0.01%, Ba 0.06%, Ge 0.03%, the rest is Al and not Avoided impurities, the single content of unavoidable impurities is ≤0.05%, and the total amount of impurities is ≤0.15%. The die casting method of die casting aluminum alloy comprises the following steps:

[0047] The first step: select aluminum ingots with a purity of 99.7%, instant silicon with a purity of 99.9%, and Al50Cu alloys, Al20Fe alloys, Al10Ti alloys, Al5Tc1B alloys, Al5Ba alloys and Al5Ge alloys as raw materials;

[0048] The second step: heating and melting the aluminum ingot at 700°C, adding 11.4% of instant silicon, 4.8% of Al50Cu and 3% of Al20Fe alloy accounting for the total weight of raw materials, stirring and melting to form an aluminum alloy liquid;

[0049] The third step: after the aluminum alloy liquid is refined and deslagged with 0.5% of the total weight of the r...

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Abstract

The invention provides high-strength wear-resisting die-cast aluminum alloy and a die casting method for the same. The high-strength wear-resisting die-cast aluminum alloy comprises the following ingredients in percentage by mass: 10.6% to 11.4% of Si, 2.1% to 2.4% of Cu, 0.6% to 0.8% of Fe, 0.1% to 0.3% of Ti, 0.03% to 0.05% of Tc, 0.006% to 0.01% of B, 0.04% to 0.06% of Ba, 0.02% to 0.03% of Geand the balance of Al and inevitable impurities. The die casting method comprises the following steps: preparing materials; smelting aluminum alloy liquid; refining; degassing; deslagging; adding a grain refiner, a Fe-enriched phase and a Si phase modifier; stiring; and performing die-casting formation. Based on optimization of main alloy elements including Si and Cu, the die casting method provided by the invention adopts microalloying treatment to refine a modified Fe-enriched phase, an eutectic Si phase and a primary Si phase and improve the strength, plasticity and wear resistance of the die-cast aluminum alloy. The die-cast aluminum alloy provided by the invention is applicable to die-casting formation of various aluminum alloy parts and components having relatively high requirementson strength, plasticity and wear resistance.

Description

technical field [0001] The invention belongs to the field of aluminum alloy die-casting, and in particular relates to a high-strength wear-resistant die-casting aluminum alloy and a die-casting method thereof. Background technique [0002] Al-Si-Cu die-casting aluminum alloy belongs to hypereutectic aluminum-silicon alloy. Due to the high content of Si, it has excellent die-casting fluidity, wear resistance and machinability, and also has good air tightness, resistance Thermal cracking and low thermal expansion coefficient, therefore, Al-Si-Cu series die-casting aluminum alloys are widely used in automobiles, motorcycles, agricultural machinery, 3C products, electric tools, sewing machines, elevators and other fields that require high wear resistance and Aluminum alloy parts with complex shapes and structures, such as engine block, cylinder liner, piston, brake block, pulley, gear pump bearing and other parts. With the development of light weight and intelligence in transpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/03B22D17/00B22D21/00
CPCB22D17/00B22D21/007C22C1/026C22C1/03C22C21/02
Inventor 付亚城王顺成
Owner 佛山市辰辉金属制品厂
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